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gecko/layout/base/nsPresShell.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 05/03/2000 IBM Corp. Observer events for reflow states
*/
/* a presentation of a document, part 2 */
#include "prlog.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/CSSStyleSheet.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/Likely.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/UniquePtr.h"
#include <algorithm>
#ifdef XP_WIN
#include "winuser.h"
#endif
#include "nsPresShell.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "mozilla/dom/BeforeAfterKeyboardEvent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h" // for Event::GetEventPopupControlState()
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/PointerEvent.h"
#include "nsIDocument.h"
#include "nsAnimationManager.h"
#include "nsNameSpaceManager.h" // for Pref-related rule management (bugs 22963,20760,31816)
#include "nsFrame.h"
#include "FrameLayerBuilder.h"
#include "nsViewManager.h"
#include "nsView.h"
#include "nsCRTGlue.h"
#include "prprf.h"
#include "prinrval.h"
#include "nsTArray.h"
#include "nsCOMArray.h"
#include "nsContainerFrame.h"
#include "nsISelection.h"
#include "mozilla/dom/Selection.h"
#include "nsGkAtoms.h"
#include "nsIDOMRange.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMElement.h"
#include "nsRange.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsReadableUtils.h"
#include "nsIPageSequenceFrame.h"
#include "nsIPermissionManager.h"
#include "nsIMozBrowserFrame.h"
#include "nsCaret.h"
#include "TouchCaret.h"
#include "SelectionCarets.h"
#include "nsIDOMHTMLDocument.h"
#include "nsFrameManager.h"
#include "nsXPCOM.h"
#include "nsILayoutHistoryState.h"
#include "nsILineIterator.h" // for ScrollContentIntoView
#include "pldhash.h"
#include "mozilla/dom/BeforeAfterKeyboardEventBinding.h"
#include "mozilla/dom/Touch.h"
#include "mozilla/dom/PointerEventBinding.h"
#include "nsIObserverService.h"
#include "nsDocShell.h" // for reflow observation
#include "nsIBaseWindow.h"
#include "nsError.h"
#include "nsLayoutUtils.h"
#include "nsViewportInfo.h"
#include "nsCSSRendering.h"
// for |#ifdef DEBUG| code
#include "prenv.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsRenderingContext.h"
#include "nsAutoLayoutPhase.h"
#ifdef MOZ_REFLOW_PERF
#include "nsFontMetrics.h"
#endif
#include "PositionedEventTargeting.h"
#include "nsIReflowCallback.h"
#include "nsPIDOMWindow.h"
#include "nsFocusManager.h"
#include "nsIObjectFrame.h"
#include "nsIObjectLoadingContent.h"
#include "nsNetUtil.h"
#include "nsThreadUtils.h"
#include "nsStyleSheetService.h"
#include "gfxContext.h"
#include "gfxUtils.h"
#include "nsSMILAnimationController.h"
#include "SVGContentUtils.h"
#include "nsSVGEffects.h"
#include "SVGFragmentIdentifier.h"
#include "nsArenaMemoryStats.h"
#include "nsFrameSelection.h"
#include "nsPerformance.h"
#include "nsRefreshDriver.h"
#include "nsDOMNavigationTiming.h"
// Drag & Drop, Clipboard
#include "nsIDocShellTreeItem.h"
#include "nsIURI.h"
#include "nsIScrollableFrame.h"
#include "nsITimer.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#include "mozilla/a11y/DocAccessible.h"
#ifdef DEBUG
#include "mozilla/a11y/Logging.h"
#endif
#endif
// For style data reconstruction
#include "nsStyleChangeList.h"
#include "nsCSSFrameConstructor.h"
#ifdef MOZ_XUL
#include "nsMenuFrame.h"
#include "nsTreeBodyFrame.h"
#include "nsIBoxObject.h"
#include "nsITreeBoxObject.h"
#include "nsMenuPopupFrame.h"
#include "nsITreeColumns.h"
#include "nsIDOMXULMultSelectCntrlEl.h"
#include "nsIDOMXULSelectCntrlItemEl.h"
#include "nsIDOMXULMenuListElement.h"
#endif
#include "GeckoProfiler.h"
#include "gfxPlatform.h"
#include "Layers.h"
#include "LayerTreeInvalidation.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsCanvasFrame.h"
#include "nsIImageLoadingContent.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "nsPlaceholderFrame.h"
#include "nsTransitionManager.h"
#include "ChildIterator.h"
#include "RestyleManager.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDragSession.h"
#include "nsIFrameInlines.h"
#include "mozilla/gfx/2D.h"
#include "nsSubDocumentFrame.h"
#ifdef ANDROID
#include "nsIDocShellTreeOwner.h"
#endif
#ifdef MOZ_TASK_TRACER
#include "GeckoTaskTracer.h"
using namespace mozilla::tasktracer;
#endif
#define ANCHOR_SCROLL_FLAGS \
(nsIPresShell::SCROLL_OVERFLOW_HIDDEN | nsIPresShell::SCROLL_NO_PARENT_FRAMES)
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::gfx;
using namespace mozilla::layout;
CapturingContentInfo nsIPresShell::gCaptureInfo =
{ false /* mAllowed */, false /* mPointerLock */, false /* mRetargetToElement */,
false /* mPreventDrag */, nullptr /* mContent */ };
nsIContent* nsIPresShell::gKeyDownTarget;
nsRefPtrHashtable<nsUint32HashKey, dom::Touch>* nsIPresShell::gCaptureTouchList;
nsClassHashtable<nsUint32HashKey, nsIPresShell::PointerCaptureInfo>* nsIPresShell::gPointerCaptureList;
nsClassHashtable<nsUint32HashKey, nsIPresShell::PointerInfo>* nsIPresShell::gActivePointersIds;
bool nsIPresShell::gPreventMouseEvents = false;
// convert a color value to a string, in the CSS format #RRGGBB
// * - initially created for bugs 31816, 20760, 22963
static void ColorToString(nscolor aColor, nsAutoString &aString);
// RangePaintInfo is used to paint ranges to offscreen buffers
struct RangePaintInfo {
nsRefPtr<nsRange> mRange;
nsDisplayListBuilder mBuilder;
nsDisplayList mList;
// offset of builder's reference frame to the root frame
nsPoint mRootOffset;
RangePaintInfo(nsRange* aRange, nsIFrame* aFrame)
: mRange(aRange), mBuilder(aFrame, nsDisplayListBuilder::PAINTING, false)
{
MOZ_COUNT_CTOR(RangePaintInfo);
}
~RangePaintInfo()
{
mList.DeleteAll();
MOZ_COUNT_DTOR(RangePaintInfo);
}
};
#undef NOISY
// ----------------------------------------------------------------------
#ifdef DEBUG
// Set the environment variable GECKO_VERIFY_REFLOW_FLAGS to one or
// more of the following flags (comma separated) for handy debug
// output.
static uint32_t gVerifyReflowFlags;
struct VerifyReflowFlags {
const char* name;
uint32_t bit;
};
static const VerifyReflowFlags gFlags[] = {
{ "verify", VERIFY_REFLOW_ON },
{ "reflow", VERIFY_REFLOW_NOISY },
{ "all", VERIFY_REFLOW_ALL },
{ "list-commands", VERIFY_REFLOW_DUMP_COMMANDS },
{ "noisy-commands", VERIFY_REFLOW_NOISY_RC },
{ "really-noisy-commands", VERIFY_REFLOW_REALLY_NOISY_RC },
{ "resize", VERIFY_REFLOW_DURING_RESIZE_REFLOW },
};
#define NUM_VERIFY_REFLOW_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
static void
ShowVerifyReflowFlags()
{
printf("Here are the available GECKO_VERIFY_REFLOW_FLAGS:\n");
const VerifyReflowFlags* flag = gFlags;
const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
printf(" %s\n", flag->name);
++flag;
}
printf("Note: GECKO_VERIFY_REFLOW_FLAGS is a comma separated list of flag\n");
printf("names (no whitespace)\n");
}
#endif
//========================================================================
//========================================================================
//========================================================================
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
static const char kGrandTotalsStr[] = "Grand Totals";
// Counting Class
class ReflowCounter {
public:
explicit ReflowCounter(ReflowCountMgr * aMgr = nullptr);
~ReflowCounter();
void ClearTotals();
void DisplayTotals(const char * aStr);
void DisplayDiffTotals(const char * aStr);
void DisplayHTMLTotals(const char * aStr);
void Add() { mTotal++; }
void Add(uint32_t aTotal) { mTotal += aTotal; }
void CalcDiffInTotals();
void SetTotalsCache();
void SetMgr(ReflowCountMgr * aMgr) { mMgr = aMgr; }
uint32_t GetTotal() { return mTotal; }
protected:
void DisplayTotals(uint32_t aTotal, const char * aTitle);
void DisplayHTMLTotals(uint32_t aTotal, const char * aTitle);
uint32_t mTotal;
uint32_t mCacheTotal;
ReflowCountMgr * mMgr; // weak reference (don't delete)
};
// Counting Class
class IndiReflowCounter {
public:
explicit IndiReflowCounter(ReflowCountMgr * aMgr = nullptr)
: mFrame(nullptr),
mCount(0),
mMgr(aMgr),
mCounter(aMgr),
mHasBeenOutput(false)
{}
virtual ~IndiReflowCounter() {}
nsAutoString mName;
nsIFrame * mFrame; // weak reference (don't delete)
int32_t mCount;
ReflowCountMgr * mMgr; // weak reference (don't delete)
ReflowCounter mCounter;
bool mHasBeenOutput;
};
//--------------------
// Manager Class
//--------------------
class ReflowCountMgr {
public:
ReflowCountMgr();
virtual ~ReflowCountMgr();
void ClearTotals();
void ClearGrandTotals();
void DisplayTotals(const char * aStr);
void DisplayHTMLTotals(const char * aStr);
void DisplayDiffsInTotals(const char * aStr);
void Add(const char * aName, nsIFrame * aFrame);
ReflowCounter * LookUp(const char * aName);
void PaintCount(const char *aName, nsRenderingContext* aRenderingContext,
nsPresContext *aPresContext, nsIFrame *aFrame,
const nsPoint &aOffset, uint32_t aColor);
FILE * GetOutFile() { return mFD; }
PLHashTable * GetIndiFrameHT() { return mIndiFrameCounts; }
void SetPresContext(nsPresContext * aPresContext) { mPresContext = aPresContext; } // weak reference
void SetPresShell(nsIPresShell* aPresShell) { mPresShell= aPresShell; } // weak reference
void SetDumpFrameCounts(bool aVal) { mDumpFrameCounts = aVal; }
void SetDumpFrameByFrameCounts(bool aVal) { mDumpFrameByFrameCounts = aVal; }
void SetPaintFrameCounts(bool aVal) { mPaintFrameByFrameCounts = aVal; }
bool IsPaintingFrameCounts() { return mPaintFrameByFrameCounts; }
protected:
void DisplayTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
void DisplayHTMLTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
static int RemoveItems(PLHashEntry *he, int i, void *arg);
static int RemoveIndiItems(PLHashEntry *he, int i, void *arg);
void CleanUp();
// stdout Output Methods
static int DoSingleTotal(PLHashEntry *he, int i, void *arg);
static int DoSingleIndi(PLHashEntry *he, int i, void *arg);
void DoGrandTotals();
void DoIndiTotalsTree();
// HTML Output Methods
static int DoSingleHTMLTotal(PLHashEntry *he, int i, void *arg);
void DoGrandHTMLTotals();
// Zero Out the Totals
static int DoClearTotals(PLHashEntry *he, int i, void *arg);
// Displays the Diff Totals
static int DoDisplayDiffTotals(PLHashEntry *he, int i, void *arg);
PLHashTable * mCounts;
PLHashTable * mIndiFrameCounts;
FILE * mFD;
bool mDumpFrameCounts;
bool mDumpFrameByFrameCounts;
bool mPaintFrameByFrameCounts;
bool mCycledOnce;
// Root Frame for Individual Tracking
nsPresContext * mPresContext;
nsIPresShell* mPresShell;
// ReflowCountMgr gReflowCountMgr;
};
#endif
//========================================================================
// comment out to hide caret
#define SHOW_CARET
// The upper bound on the amount of time to spend reflowing, in
// microseconds. When this bound is exceeded and reflow commands are
// still queued up, a reflow event is posted. The idea is for reflow
// to not hog the processor beyond the time specifed in
// gMaxRCProcessingTime. This data member is initialized from the
// layout.reflow.timeslice pref.
#define NS_MAX_REFLOW_TIME 1000000
static int32_t gMaxRCProcessingTime = -1;
struct nsCallbackEventRequest
{
nsIReflowCallback* callback;
nsCallbackEventRequest* next;
};
// ----------------------------------------------------------------------------
#define ASSERT_REFLOW_SCHEDULED_STATE() \
NS_ASSERTION(mReflowScheduled == \
GetPresContext()->RefreshDriver()-> \
IsLayoutFlushObserver(this), "Unexpected state")
class nsAutoCauseReflowNotifier
{
public:
explicit nsAutoCauseReflowNotifier(PresShell* aShell)
: mShell(aShell)
{
mShell->WillCauseReflow();
}
~nsAutoCauseReflowNotifier()
{
// This check should not be needed. Currently the only place that seem
// to need it is the code that deals with bug 337586.
if (!mShell->mHaveShutDown) {
mShell->DidCauseReflow();
}
else {
nsContentUtils::RemoveScriptBlocker();
}
}
PresShell* mShell;
};
class MOZ_STACK_CLASS nsPresShellEventCB : public EventDispatchingCallback
{
public:
explicit nsPresShellEventCB(PresShell* aPresShell) : mPresShell(aPresShell) {}
virtual void HandleEvent(EventChainPostVisitor& aVisitor) MOZ_OVERRIDE
{
if (aVisitor.mPresContext && aVisitor.mEvent->mClass != eBasicEventClass) {
if (aVisitor.mEvent->message == NS_MOUSE_BUTTON_DOWN ||
aVisitor.mEvent->message == NS_MOUSE_BUTTON_UP) {
// Mouse-up and mouse-down events call nsFrame::HandlePress/Release
// which call GetContentOffsetsFromPoint which requires up-to-date layout.
// Bring layout up-to-date now so that GetCurrentEventFrame() below
// will return a real frame and we don't have to worry about
// destroying it by flushing later.
mPresShell->FlushPendingNotifications(Flush_Layout);
} else if (aVisitor.mEvent->message == NS_WHEEL_WHEEL &&
aVisitor.mEventStatus != nsEventStatus_eConsumeNoDefault) {
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (frame) {
// chrome (including addons) should be able to know if content
// handles both D3E "wheel" event and legacy mouse scroll events.
// We should dispatch legacy mouse events before dispatching the
// "wheel" event into system group.
nsRefPtr<EventStateManager> esm =
aVisitor.mPresContext->EventStateManager();
esm->DispatchLegacyMouseScrollEvents(frame,
aVisitor.mEvent->AsWheelEvent(),
&aVisitor.mEventStatus);
}
}
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (!frame &&
(aVisitor.mEvent->message == NS_MOUSE_BUTTON_UP ||
aVisitor.mEvent->message == NS_TOUCH_END)) {
// Redirect BUTTON_UP and TOUCH_END events to the root frame to ensure
// that capturing is released.
frame = mPresShell->GetRootFrame();
}
if (frame) {
frame->HandleEvent(aVisitor.mPresContext,
aVisitor.mEvent->AsGUIEvent(),
&aVisitor.mEventStatus);
}
}
}
nsRefPtr<PresShell> mPresShell;
};
class nsBeforeFirstPaintDispatcher : public nsRunnable
{
public:
explicit nsBeforeFirstPaintDispatcher(nsIDocument* aDocument)
: mDocument(aDocument) {}
// Fires the "before-first-paint" event so that interested parties (right now, the
// mobile browser) are aware of it.
NS_IMETHOD Run() MOZ_OVERRIDE
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mDocument, "before-first-paint",
nullptr);
}
return NS_OK;
}
private:
nsCOMPtr<nsIDocument> mDocument;
};
bool PresShell::sDisableNonTestMouseEvents = false;
#ifdef PR_LOGGING
PRLogModuleInfo* PresShell::gLog;
#endif
#ifdef DEBUG
static void
VerifyStyleTree(nsPresContext* aPresContext, nsFrameManager* aFrameManager)
{
if (nsFrame::GetVerifyStyleTreeEnable()) {
nsIFrame* rootFrame = aFrameManager->GetRootFrame();
aPresContext->RestyleManager()->DebugVerifyStyleTree(rootFrame);
}
}
#define VERIFY_STYLE_TREE ::VerifyStyleTree(mPresContext, mFrameConstructor)
#else
#define VERIFY_STYLE_TREE
#endif
static bool gVerifyReflowEnabled;
bool
nsIPresShell::GetVerifyReflowEnable()
{
#ifdef DEBUG
static bool firstTime = true;
if (firstTime) {
firstTime = false;
char* flags = PR_GetEnv("GECKO_VERIFY_REFLOW_FLAGS");
if (flags) {
bool error = false;
for (;;) {
char* comma = PL_strchr(flags, ',');
if (comma)
*comma = '\0';
bool found = false;
const VerifyReflowFlags* flag = gFlags;
const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
if (PL_strcasecmp(flag->name, flags) == 0) {
gVerifyReflowFlags |= flag->bit;
found = true;
break;
}
++flag;
}
if (! found)
error = true;
if (! comma)
break;
*comma = ',';
flags = comma + 1;
}
if (error)
ShowVerifyReflowFlags();
}
if (VERIFY_REFLOW_ON & gVerifyReflowFlags) {
gVerifyReflowEnabled = true;
printf("Note: verifyreflow is enabled");
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf(" (noisy)");
}
if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
printf(" (all)");
}
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf(" (show reflow commands)");
}
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
printf(" (noisy reflow commands)");
if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
printf(" (REALLY noisy reflow commands)");
}
}
printf("\n");
}
}
#endif
return gVerifyReflowEnabled;
}
void
PresShell::AddInvalidateHiddenPresShellObserver(nsRefreshDriver *aDriver)
{
if (!mHiddenInvalidationObserverRefreshDriver && !mIsDestroying && !mHaveShutDown) {
aDriver->AddPresShellToInvalidateIfHidden(this);
mHiddenInvalidationObserverRefreshDriver = aDriver;
}
}
void
nsIPresShell::InvalidatePresShellIfHidden()
{
if (!IsVisible() && mPresContext) {
mPresContext->NotifyInvalidation(0);
}
mHiddenInvalidationObserverRefreshDriver = nullptr;
}
void
nsIPresShell::CancelInvalidatePresShellIfHidden()
{
if (mHiddenInvalidationObserverRefreshDriver) {
mHiddenInvalidationObserverRefreshDriver->RemovePresShellToInvalidateIfHidden(this);
mHiddenInvalidationObserverRefreshDriver = nullptr;
}
}
void
nsIPresShell::SetVerifyReflowEnable(bool aEnabled)
{
gVerifyReflowEnabled = aEnabled;
}
/* virtual */ void
nsIPresShell::AddWeakFrameExternal(nsWeakFrame* aWeakFrame)
{
AddWeakFrameInternal(aWeakFrame);
}
void
nsIPresShell::AddWeakFrameInternal(nsWeakFrame* aWeakFrame)
{
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
aWeakFrame->SetPreviousWeakFrame(mWeakFrames);
mWeakFrames = aWeakFrame;
}
/* virtual */ void
nsIPresShell::RemoveWeakFrameExternal(nsWeakFrame* aWeakFrame)
{
RemoveWeakFrameInternal(aWeakFrame);
}
void
nsIPresShell::RemoveWeakFrameInternal(nsWeakFrame* aWeakFrame)
{
if (mWeakFrames == aWeakFrame) {
mWeakFrames = aWeakFrame->GetPreviousWeakFrame();
return;
}
nsWeakFrame* nextWeak = mWeakFrames;
while (nextWeak && nextWeak->GetPreviousWeakFrame() != aWeakFrame) {
nextWeak = nextWeak->GetPreviousWeakFrame();
}
if (nextWeak) {
nextWeak->SetPreviousWeakFrame(aWeakFrame->GetPreviousWeakFrame());
}
}
already_AddRefed<nsFrameSelection>
nsIPresShell::FrameSelection()
{
nsRefPtr<nsFrameSelection> ret = mSelection;
return ret.forget();
}
//----------------------------------------------------------------------
static bool sSynthMouseMove = true;
static uint32_t sNextPresShellId;
static bool sPointerEventEnabled = true;
static bool sTouchCaretEnabled = false;
static bool sSelectionCaretEnabled = false;
static bool sBeforeAfterKeyboardEventEnabled = false;
/* static */ bool
PresShell::TouchCaretPrefEnabled()
{
static bool initialized = false;
if (!initialized) {
Preferences::AddBoolVarCache(&sTouchCaretEnabled, "touchcaret.enabled");
initialized = true;
}
return sTouchCaretEnabled;
}
/* static */ bool
PresShell::SelectionCaretPrefEnabled()
{
static bool initialized = false;
if (!initialized) {
Preferences::AddBoolVarCache(&sSelectionCaretEnabled, "selectioncaret.enabled");
initialized = true;
}
return sSelectionCaretEnabled;
}
/* static */ bool
PresShell::BeforeAfterKeyboardEventEnabled()
{
static bool sInitialized = false;
if (!sInitialized) {
Preferences::AddBoolVarCache(&sBeforeAfterKeyboardEventEnabled,
"dom.beforeAfterKeyboardEvent.enabled");
sInitialized = true;
}
return sBeforeAfterKeyboardEventEnabled;
}
PresShell::PresShell()
: mMouseLocation(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)
{
mSelection = nullptr;
#ifdef MOZ_REFLOW_PERF
mReflowCountMgr = new ReflowCountMgr();
mReflowCountMgr->SetPresContext(mPresContext);
mReflowCountMgr->SetPresShell(this);
#endif
#ifdef PR_LOGGING
mLoadBegin = TimeStamp::Now();
if (!gLog) {
gLog = PR_NewLogModule("PresShell");
}
#endif
mSelectionFlags = nsISelectionDisplay::DISPLAY_TEXT | nsISelectionDisplay::DISPLAY_IMAGES;
mIsThemeSupportDisabled = false;
mIsActive = true;
// FIXME/bug 735029: find a better solution to this problem
#ifdef MOZ_WIDGET_ANDROID
// The java pan/zoom code uses this to mean approximately "request a
// reset of pan/zoom state" which doesn't necessarily correspond
// with the first paint of content.
mIsFirstPaint = false;
#else
mIsFirstPaint = true;
#endif
mPresShellId = sNextPresShellId++;
mFrozen = false;
#ifdef DEBUG
mPresArenaAllocCount = 0;
#endif
mRenderFlags = 0;
mXResolution = 1.0;
mYResolution = 1.0;
mViewportOverridden = false;
mScrollPositionClampingScrollPortSizeSet = false;
mMaxLineBoxWidth = 0;
static bool addedSynthMouseMove = false;
if (!addedSynthMouseMove) {
Preferences::AddBoolVarCache(&sSynthMouseMove,
"layout.reflow.synthMouseMove", true);
addedSynthMouseMove = true;
}
static bool addedPointerEventEnabled = false;
if (!addedPointerEventEnabled) {
Preferences::AddBoolVarCache(&sPointerEventEnabled,
"dom.w3c_pointer_events.enabled", true);
addedPointerEventEnabled = true;
}
mPaintingIsFrozen = false;
mHasCSSBackgroundColor = true;
}
NS_IMPL_ISUPPORTS(PresShell, nsIPresShell, nsIDocumentObserver,
nsISelectionController,
nsISelectionDisplay, nsIObserver, nsISupportsWeakReference,
nsIMutationObserver)
PresShell::~PresShell()
{
if (!mHaveShutDown) {
NS_NOTREACHED("Someone did not call nsIPresShell::destroy");
Destroy();
}
NS_ASSERTION(mCurrentEventContentStack.Count() == 0,
"Huh, event content left on the stack in pres shell dtor!");
NS_ASSERTION(mFirstCallbackEventRequest == nullptr &&
mLastCallbackEventRequest == nullptr,
"post-reflow queues not empty. This means we're leaking");
// Verify that if painting was frozen, but we're being removed from the tree,
// that we now re-enable painting on our refresh driver, since it may need to
// be re-used by another presentation.
if (mPaintingIsFrozen) {
mPresContext->RefreshDriver()->Thaw();
}
#ifdef DEBUG
MOZ_ASSERT(mPresArenaAllocCount == 0,
"Some pres arena objects were not freed");
#endif
delete mStyleSet;
delete mFrameConstructor;
mCurrentEventContent = nullptr;
NS_IF_RELEASE(mPresContext);
NS_IF_RELEASE(mDocument);
NS_IF_RELEASE(mSelection);
}
/**
* Initialize the presentation shell. Create view manager and style
* manager.
* Note this can't be merged into our constructor because caret initialization
* calls AddRef() on us.
*/
void
PresShell::Init(nsIDocument* aDocument,
nsPresContext* aPresContext,
nsViewManager* aViewManager,
nsStyleSet* aStyleSet,
nsCompatibility aCompatMode)
{
NS_PRECONDITION(aDocument, "null ptr");
NS_PRECONDITION(aPresContext, "null ptr");
NS_PRECONDITION(aViewManager, "null ptr");
NS_PRECONDITION(!mDocument, "already initialized");
if (!aDocument || !aPresContext || !aViewManager || mDocument) {
return;
}
mDocument = aDocument;
NS_ADDREF(mDocument);
mViewManager = aViewManager;
// Create our frame constructor.
mFrameConstructor = new nsCSSFrameConstructor(mDocument, this, aStyleSet);
mFrameManager = mFrameConstructor;
// The document viewer owns both view manager and pres shell.
mViewManager->SetPresShell(this);
// Bind the context to the presentation shell.
mPresContext = aPresContext;
NS_ADDREF(mPresContext);
aPresContext->SetShell(this);
// Now we can initialize the style set.
aStyleSet->Init(aPresContext);
mStyleSet = aStyleSet;
// Notify our prescontext that it now has a compatibility mode. Note that
// this MUST happen after we set up our style set but before we create any
// frames.
mPresContext->CompatibilityModeChanged();
// setup the preference style rules (no forced reflow), and do it
// before creating any frames.
SetPreferenceStyleRules(false);
if (TouchCaretPrefEnabled()) {
// Create touch caret handle
mTouchCaret = new TouchCaret(this);
}
if (SelectionCaretPrefEnabled()) {
// Create selection caret handle
mSelectionCarets = new SelectionCarets(this);
mSelectionCarets->Init();
}
NS_ADDREF(mSelection = new nsFrameSelection());
mSelection->Init(this, nullptr);
// Important: this has to happen after the selection has been set up
#ifdef SHOW_CARET
// make the caret
mCaret = new nsCaret();
mCaret->Init(this);
mOriginalCaret = mCaret;
//SetCaretEnabled(true); // make it show in browser windows
#endif
//set up selection to be displayed in document
// Don't enable selection for print media
nsPresContext::nsPresContextType type = aPresContext->Type();
if (type != nsPresContext::eContext_PrintPreview &&
type != nsPresContext::eContext_Print)
SetDisplaySelection(nsISelectionController::SELECTION_DISABLED);
if (gMaxRCProcessingTime == -1) {
gMaxRCProcessingTime =
Preferences::GetInt("layout.reflow.timeslice", NS_MAX_REFLOW_TIME);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->AddObserver(this, "agent-sheet-added", false);
os->AddObserver(this, "user-sheet-added", false);
os->AddObserver(this, "author-sheet-added", false);
os->AddObserver(this, "agent-sheet-removed", false);
os->AddObserver(this, "user-sheet-removed", false);
os->AddObserver(this, "author-sheet-removed", false);
#ifdef MOZ_XUL
os->AddObserver(this, "chrome-flush-skin-caches", false);
#endif
}
}
#ifdef MOZ_REFLOW_PERF
if (mReflowCountMgr) {
bool paintFrameCounts =
Preferences::GetBool("layout.reflow.showframecounts");
bool dumpFrameCounts =
Preferences::GetBool("layout.reflow.dumpframecounts");
bool dumpFrameByFrameCounts =
Preferences::GetBool("layout.reflow.dumpframebyframecounts");
mReflowCountMgr->SetDumpFrameCounts(dumpFrameCounts);
mReflowCountMgr->SetDumpFrameByFrameCounts(dumpFrameByFrameCounts);
mReflowCountMgr->SetPaintFrameCounts(paintFrameCounts);
}
#endif
if (mDocument->HasAnimationController()) {
nsSMILAnimationController* animCtrl = mDocument->GetAnimationController();
animCtrl->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
// Get our activeness from the docShell.
QueryIsActive();
// Setup our font inflation preferences.
SetupFontInflation();
}
#ifdef PR_LOGGING
enum TextPerfLogType {
eLog_reflow,
eLog_loaddone,
eLog_totals
};
static void
LogTextPerfStats(gfxTextPerfMetrics* aTextPerf,
PresShell* aPresShell,
const gfxTextPerfMetrics::TextCounts& aCounts,
float aTime, TextPerfLogType aLogType, const char* aURL)
{
char prefix[256];
switch (aLogType) {
case eLog_reflow:
sprintf(prefix, "(textperf-reflow) %p time-ms: %7.0f", aPresShell, aTime);
break;
case eLog_loaddone:
sprintf(prefix, "(textperf-loaddone) %p time-ms: %7.0f", aPresShell, aTime);
break;
default:
MOZ_ASSERT(aLogType == eLog_totals, "unknown textperf log type");
sprintf(prefix, "(textperf-totals) %p", aPresShell);
}
PRLogModuleInfo* tpLog = gfxPlatform::GetLog(eGfxLog_textperf);
// ignore XUL contexts unless at debug level
PRLogModuleLevel logLevel = PR_LOG_WARNING;
if (aCounts.numContentTextRuns == 0) {
logLevel = PR_LOG_DEBUG;
}
double hitRatio = 0.0;
uint32_t lookups = aCounts.wordCacheHit + aCounts.wordCacheMiss;
if (lookups) {
hitRatio = double(aCounts.wordCacheHit) / double(lookups);
}
if (aLogType == eLog_loaddone) {
PR_LOG(tpLog, logLevel,
("%s reflow: %d chars: %d "
"[%s] "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
(aURL ? aURL : ""),
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen,
lookups, hitRatio,
aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr,
aTextPerf->cumulative.textrunDestr));
} else {
PR_LOG(tpLog, logLevel,
("%s reflow: %d chars: %d "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen,
lookups, hitRatio,
aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr,
aTextPerf->cumulative.textrunDestr));
}
}
#endif
void
PresShell::Destroy()
{
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on presshell while scripts not blocked");
// dump out cumulative text perf metrics
#ifdef PR_LOGGING
gfxTextPerfMetrics* tp;
if (mPresContext && (tp = mPresContext->GetTextPerfMetrics())) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, 0.0, eLog_totals, nullptr);
}
}
#endif
#ifdef MOZ_REFLOW_PERF
DumpReflows();
if (mReflowCountMgr) {
delete mReflowCountMgr;
mReflowCountMgr = nullptr;
}
#endif
if (mHaveShutDown)
return;
#ifdef ACCESSIBILITY
if (mDocAccessible) {
#ifdef DEBUG
if (a11y::logging::IsEnabled(a11y::logging::eDocDestroy))
a11y::logging::DocDestroy("presshell destroyed", mDocument);
#endif
mDocAccessible->Shutdown();
mDocAccessible = nullptr;
}
#endif // ACCESSIBILITY
MaybeReleaseCapturingContent();
if (gKeyDownTarget && gKeyDownTarget->OwnerDoc() == mDocument) {
NS_RELEASE(gKeyDownTarget);
}
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
if (mPresContext) {
// We need to notify the destroying the nsPresContext to ESM for
// suppressing to use from ESM.
mPresContext->EventStateManager()->NotifyDestroyPresContext(mPresContext);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->RemoveObserver(this, "agent-sheet-added");
os->RemoveObserver(this, "user-sheet-added");
os->RemoveObserver(this, "author-sheet-added");
os->RemoveObserver(this, "agent-sheet-removed");
os->RemoveObserver(this, "user-sheet-removed");
os->RemoveObserver(this, "author-sheet-removed");
#ifdef MOZ_XUL
os->RemoveObserver(this, "chrome-flush-skin-caches");
#endif
}
}
// If our paint suppression timer is still active, kill it.
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
// Same for our reflow continuation timer
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
if (mDelayedPaintTimer) {
mDelayedPaintTimer->Cancel();
mDelayedPaintTimer = nullptr;
}
mSynthMouseMoveEvent.Revoke();
mUpdateImageVisibilityEvent.Revoke();
ClearVisibleImagesList();
if (mCaret) {
mCaret->Terminate();
mCaret = nullptr;
}
if (mSelection) {
mSelection->DisconnectFromPresShell();
}
if (mTouchCaret) {
mTouchCaret->Terminate();
mTouchCaret = nullptr;
}
if (mSelectionCarets) {
mSelectionCarets->Terminate();
mSelectionCarets = nullptr;
}
// release our pref style sheet, if we have one still
ClearPreferenceStyleRules();
mIsDestroying = true;
// We can't release all the event content in
// mCurrentEventContentStack here since there might be code on the
// stack that will release the event content too. Double release
// bad!
// The frames will be torn down, so remove them from the current
// event frame stack (since they'd be dangling references if we'd
// leave them in) and null out the mCurrentEventFrame pointer as
// well.
mCurrentEventFrame = nullptr;
int32_t i, count = mCurrentEventFrameStack.Length();
for (i = 0; i < count; i++) {
mCurrentEventFrameStack[i] = nullptr;
}
mFramesToDirty.Clear();
if (mViewManager) {
// Clear the view manager's weak pointer back to |this| in case it
// was leaked.
mViewManager->SetPresShell(nullptr);
mViewManager = nullptr;
}
mStyleSet->BeginShutdown(mPresContext);
nsRefreshDriver* rd = GetPresContext()->RefreshDriver();
// This shell must be removed from the document before the frame
// hierarchy is torn down to avoid finding deleted frames through
// this presshell while the frames are being torn down
if (mDocument) {
NS_ASSERTION(mDocument->GetShell() == this, "Wrong shell?");
mDocument->DeleteShell();
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->NotifyRefreshDriverDestroying(rd);
}
}
// Revoke any pending events. We need to do this and cancel pending reflows
// before we destroy the frame manager, since apparently frame destruction
// sometimes spins the event queue when plug-ins are involved(!).
rd->RemoveLayoutFlushObserver(this);
if (mHiddenInvalidationObserverRefreshDriver) {
mHiddenInvalidationObserverRefreshDriver->RemovePresShellToInvalidateIfHidden(this);
}
if (rd->PresContext() == GetPresContext()) {
rd->RevokeViewManagerFlush();
}
mResizeEvent.Revoke();
if (mAsyncResizeTimerIsActive) {
mAsyncResizeEventTimer->Cancel();
mAsyncResizeTimerIsActive = false;
}
CancelAllPendingReflows();
CancelPostedReflowCallbacks();
// Destroy the frame manager. This will destroy the frame hierarchy
mFrameConstructor->WillDestroyFrameTree();
// Destroy all frame properties (whose destruction was suppressed
// while destroying the frame tree, but which might contain more
// frames within the properties.
if (mPresContext) {
// Clear out the prescontext's property table -- since our frame tree is
// now dead, we shouldn't be looking up any more properties in that table.
// We want to do this before we call SetShell() on the prescontext, so
// property destructors can usefully call GetPresShell() on the
// prescontext.
mPresContext->PropertyTable()->DeleteAll();
}
NS_WARN_IF_FALSE(!mWeakFrames, "Weak frames alive after destroying FrameManager");
while (mWeakFrames) {
mWeakFrames->Clear(this);
}
// Let the style set do its cleanup.
mStyleSet->Shutdown(mPresContext);
if (mPresContext) {
// We hold a reference to the pres context, and it holds a weak link back
// to us. To avoid the pres context having a dangling reference, set its
// pres shell to nullptr
mPresContext->SetShell(nullptr);
// Clear the link handler (weak reference) as well
mPresContext->SetLinkHandler(nullptr);
}
mHaveShutDown = true;
EvictTouches();
}
void
PresShell::MakeZombie()
{
mIsZombie = true;
CancelAllPendingReflows();
}
void
nsIPresShell::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled != mStyleSet->GetAuthorStyleDisabled()) {
mStyleSet->SetAuthorStyleDisabled(aStyleDisabled);
ReconstructStyleData();
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mDocument,
"author-style-disabled-changed",
nullptr);
}
}
}
bool
nsIPresShell::GetAuthorStyleDisabled() const
{
return mStyleSet->GetAuthorStyleDisabled();
}
nsresult
PresShell::SetPreferenceStyleRules(bool aForceReflow)
{
if (!mDocument) {
return NS_ERROR_NULL_POINTER;
}
nsPIDOMWindow *window = mDocument->GetWindow();
// If the document doesn't have a window there's no need to notify
// its presshell about changes to preferences since the document is
// in a state where it doesn't matter any more (see
// nsDocumentViewer::Close()).
if (!window) {
return NS_ERROR_NULL_POINTER;
}
NS_PRECONDITION(mPresContext, "presContext cannot be null");
if (mPresContext) {
// first, make sure this is not a chrome shell
if (nsContentUtils::IsInChromeDocshell(mDocument)) {
return NS_OK;
}
#ifdef DEBUG_attinasi
printf("Setting Preference Style Rules:\n");
#endif
// if here, we need to create rules for the prefs
// - this includes the background-color, the text-color,
// the link color, the visited link color and the link-underlining
// first clear any exising rules
nsresult result = ClearPreferenceStyleRules();
// now the link rules (must come after the color rules, or links will not be correct color!)
// XXX - when there is both an override and agent pref stylesheet this won't matter,
// as the color rules will be overrides and the links rules will be agent
if (NS_SUCCEEDED(result)) {
result = SetPrefLinkRules();
}
if (NS_SUCCEEDED(result)) {
result = SetPrefFocusRules();
}
if (NS_SUCCEEDED(result)) {
result = SetPrefNoScriptRule();
}
if (NS_SUCCEEDED(result)) {
result = SetPrefNoFramesRule();
}
#ifdef DEBUG_attinasi
printf( "Preference Style Rules set: error=%ld\n", (long)result);
#endif
// Note that this method never needs to force any calculation; the caller
// will recalculate style if needed
return result;
}
return NS_ERROR_NULL_POINTER;
}
nsresult PresShell::ClearPreferenceStyleRules(void)
{
nsresult result = NS_OK;
if (mPrefStyleSheet) {
NS_ASSERTION(mStyleSet, "null styleset entirely unexpected!");
if (mStyleSet) {
// remove the sheet from the styleset:
// - note that we have to check for success by comparing the count before and after...
#ifdef DEBUG
int32_t numBefore = mStyleSet->SheetCount(nsStyleSet::eUserSheet);
NS_ASSERTION(numBefore > 0, "no user stylesheets in styleset, but we have one!");
#endif
mStyleSet->RemoveStyleSheet(nsStyleSet::eUserSheet, mPrefStyleSheet);
#ifdef DEBUG_attinasi
NS_ASSERTION((numBefore - 1) == mStyleSet->GetNumberOfUserStyleSheets(),
"Pref stylesheet was not removed");
printf("PrefStyleSheet removed\n");
#endif
// clear the sheet pointer: it is strictly historical now
mPrefStyleSheet = nullptr;
}
}
return result;
}
nsresult
PresShell::CreatePreferenceStyleSheet()
{
NS_ASSERTION(!mPrefStyleSheet, "prefStyleSheet already exists");
mPrefStyleSheet = new CSSStyleSheet(CORS_NONE, mozilla::net::RP_Default);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewURI(getter_AddRefs(uri), "about:PreferenceStyleSheet", nullptr);
if (NS_FAILED(rv)) {
mPrefStyleSheet = nullptr;
return rv;
}
NS_ASSERTION(uri, "null but no error");
mPrefStyleSheet->SetURIs(uri, uri, uri);
mPrefStyleSheet->SetComplete();
uint32_t index;
rv =
mPrefStyleSheet->InsertRuleInternal(NS_LITERAL_STRING("@namespace svg url(http://www.w3.org/2000/svg);"),
0, &index);
if (NS_FAILED(rv)) {
mPrefStyleSheet = nullptr;
return rv;
}
rv =
mPrefStyleSheet->InsertRuleInternal(NS_LITERAL_STRING("@namespace url(http://www.w3.org/1999/xhtml);"),
0, &index);
if (NS_FAILED(rv)) {
mPrefStyleSheet = nullptr;
return rv;
}
mStyleSet->AppendStyleSheet(nsStyleSet::eUserSheet, mPrefStyleSheet);
return NS_OK;
}
// XXX We want these after the @namespace rules. Does order matter
// for these rules, or can we call StyleRule::StyleRuleCount()
// and just "append"?
static uint32_t sInsertPrefSheetRulesAt = 2;
nsresult
PresShell::SetPrefNoScriptRule()
{
nsresult rv = NS_OK;
// also handle the case where print is done from print preview
// see bug #342439 for more details
nsIDocument* doc = mDocument;
if (doc->IsStaticDocument()) {
doc = doc->GetOriginalDocument();
}
bool scriptEnabled = doc->IsScriptEnabled();
if (scriptEnabled) {
if (!mPrefStyleSheet) {
rv = CreatePreferenceStyleSheet();
NS_ENSURE_SUCCESS(rv, rv);
}
uint32_t index = 0;
mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("noscript{display:none!important}"),
sInsertPrefSheetRulesAt, &index);
}
return rv;
}
nsresult PresShell::SetPrefNoFramesRule(void)
{
NS_ASSERTION(mPresContext,"null prescontext not allowed");
if (!mPresContext) {
return NS_ERROR_FAILURE;
}
nsresult rv = NS_OK;
if (!mPrefStyleSheet) {
rv = CreatePreferenceStyleSheet();
NS_ENSURE_SUCCESS(rv, rv);
}
NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
bool allowSubframes = true;
nsCOMPtr<nsIDocShell> docShell(mPresContext->GetDocShell());
if (docShell) {
docShell->GetAllowSubframes(&allowSubframes);
}
if (!allowSubframes) {
uint32_t index = 0;
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("noframes{display:block}"),
sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(rv, rv);
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("frame, frameset, iframe {display:none!important}"),
sInsertPrefSheetRulesAt, &index);
}
return rv;
}
nsresult PresShell::SetPrefLinkRules(void)
{
NS_ASSERTION(mPresContext,"null prescontext not allowed");
if (!mPresContext) {
return NS_ERROR_FAILURE;
}
nsresult rv = NS_OK;
if (!mPrefStyleSheet) {
rv = CreatePreferenceStyleSheet();
NS_ENSURE_SUCCESS(rv, rv);
}
NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
// support default link colors:
// this means the link colors need to be overridable,
// which they are if we put them in the agent stylesheet,
// though if using an override sheet this will cause authors grief still
// In the agent stylesheet, they are !important when we are ignoring document colors
nscolor linkColor(mPresContext->DefaultLinkColor());
nscolor activeColor(mPresContext->DefaultActiveLinkColor());
nscolor visitedColor(mPresContext->DefaultVisitedLinkColor());
NS_NAMED_LITERAL_STRING(ruleClose, "}");
uint32_t index = 0;
nsAutoString strColor;
// insert a rule to color links: '*|*:link {color: #RRGGBB [!important];}'
ColorToString(linkColor, strColor);
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:link{color:") +
strColor + ruleClose,
sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(rv, rv);
// - visited links: '*|*:visited {color: #RRGGBB [!important];}'
ColorToString(visitedColor, strColor);
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:visited{color:") +
strColor + ruleClose,
sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(rv, rv);
// - active links: '*|*:-moz-any-link:active {color: #RRGGBB [!important];}'
ColorToString(activeColor, strColor);
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link:active{color:") +
strColor + ruleClose,
sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(rv, rv);
bool underlineLinks =
mPresContext->GetCachedBoolPref(kPresContext_UnderlineLinks);
if (underlineLinks) {
// create a rule to make underlining happen
// '*|*:-moz-any-link {text-decoration:[underline|none];}'
// no need for important, we want these to be overridable
// NOTE: these must go in the agent stylesheet or they cannot be
// overridden by authors
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link:not(svg|a){text-decoration:underline}"),
sInsertPrefSheetRulesAt, &index);
} else {
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link{text-decoration:none}"),
sInsertPrefSheetRulesAt, &index);
}
return rv;
}
nsresult PresShell::SetPrefFocusRules(void)
{
NS_ASSERTION(mPresContext,"null prescontext not allowed");
nsresult result = NS_OK;
if (!mPresContext)
result = NS_ERROR_FAILURE;
if (NS_SUCCEEDED(result) && !mPrefStyleSheet)
result = CreatePreferenceStyleSheet();
if (NS_SUCCEEDED(result)) {
NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
if (mPresContext->GetUseFocusColors()) {
nscolor focusBackground(mPresContext->FocusBackgroundColor());
nscolor focusText(mPresContext->FocusTextColor());
// insert a rule to make focus the preferred color
uint32_t index = 0;
nsAutoString strRule, strColor;
///////////////////////////////////////////////////////////////
// - focus: '*:focus
ColorToString(focusText,strColor);
strRule.AppendLiteral("*:focus,*:focus>font {color: ");
strRule.Append(strColor);
strRule.AppendLiteral(" !important; background-color: ");
ColorToString(focusBackground,strColor);
strRule.Append(strColor);
strRule.AppendLiteral(" !important; } ");
// insert the rules
result = mPrefStyleSheet->
InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
}
uint8_t focusRingWidth = mPresContext->FocusRingWidth();
bool focusRingOnAnything = mPresContext->GetFocusRingOnAnything();
uint8_t focusRingStyle = mPresContext->GetFocusRingStyle();
if ((NS_SUCCEEDED(result) && focusRingWidth != 1 && focusRingWidth <= 4 ) || focusRingOnAnything) {
uint32_t index = 0;
nsAutoString strRule;
if (!focusRingOnAnything)
strRule.AppendLiteral("*|*:link:focus, *|*:visited"); // If we only want focus rings on the normal things like links
strRule.AppendLiteral(":focus {outline: "); // For example 3px dotted WindowText (maximum 4)
strRule.AppendInt(focusRingWidth);
if (focusRingStyle == 0) // solid
strRule.AppendLiteral("px solid -moz-mac-focusring !important; -moz-outline-radius: 3px; outline-offset: 1px; } ");
else // dotted
strRule.AppendLiteral("px dotted WindowText !important; } ");
// insert the rules
result = mPrefStyleSheet->
InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(result, result);
if (focusRingWidth != 1) {
// If the focus ring width is different from the default, fix buttons with rings
strRule.AssignLiteral("button::-moz-focus-inner, input[type=\"reset\"]::-moz-focus-inner,");
strRule.AppendLiteral("input[type=\"button\"]::-moz-focus-inner, ");
strRule.AppendLiteral("input[type=\"submit\"]::-moz-focus-inner { padding: 1px 2px 1px 2px; border: ");
strRule.AppendInt(focusRingWidth);
if (focusRingStyle == 0) // solid
strRule.AppendLiteral("px solid transparent !important; } ");
else
strRule.AppendLiteral("px dotted transparent !important; } ");
result = mPrefStyleSheet->
InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(result, result);
strRule.AssignLiteral("button:focus::-moz-focus-inner, input[type=\"reset\"]:focus::-moz-focus-inner,");
strRule.AppendLiteral("input[type=\"button\"]:focus::-moz-focus-inner, input[type=\"submit\"]:focus::-moz-focus-inner {");
strRule.AppendLiteral("border-color: ButtonText !important; }");
result = mPrefStyleSheet->
InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
}
}
}
return result;
}
void
PresShell::AddUserSheet(nsISupports* aSheet)
{
// Make sure this does what nsDocumentViewer::CreateStyleSet does wrt
// ordering. We want this new sheet to come after all the existing stylesheet
// service sheets, but before other user sheets; see nsIStyleSheetService.idl
// for the ordering. Just remove and readd all the nsStyleSheetService
// sheets.
nsCOMPtr<nsIStyleSheetService> dummy =
do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
mStyleSet->BeginUpdate();
nsStyleSheetService *sheetService = nsStyleSheetService::gInstance;
nsCOMArray<nsIStyleSheet> & userSheets = *sheetService->UserStyleSheets();
int32_t i;
// Iterate forwards when removing so the searches for RemoveStyleSheet are as
// short as possible.
for (i = 0; i < userSheets.Count(); ++i) {
mStyleSet->RemoveStyleSheet(nsStyleSet::eUserSheet, userSheets[i]);
}
// Now iterate backwards, so that the order of userSheets will be the same as
// the order of sheets from it in the style set.
for (i = userSheets.Count() - 1; i >= 0; --i) {
mStyleSet->PrependStyleSheet(nsStyleSet::eUserSheet, userSheets[i]);
}
mStyleSet->EndUpdate();
ReconstructStyleData();
}
void
PresShell::AddAgentSheet(nsISupports* aSheet)
{
// Make sure this does what nsDocumentViewer::CreateStyleSet does
// wrt ordering.
nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
if (!sheet) {
return;
}
mStyleSet->AppendStyleSheet(nsStyleSet::eAgentSheet, sheet);
ReconstructStyleData();
}
void
PresShell::AddAuthorSheet(nsISupports* aSheet)
{
nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
if (!sheet) {
return;
}
// Document specific "additional" Author sheets should be stronger than the ones
// added with the StyleSheetService.
nsIStyleSheet* firstAuthorSheet = mDocument->FirstAdditionalAuthorSheet();
if (firstAuthorSheet) {
mStyleSet->InsertStyleSheetBefore(nsStyleSet::eDocSheet, sheet, firstAuthorSheet);
} else {
mStyleSet->AppendStyleSheet(nsStyleSet::eDocSheet, sheet);
}
ReconstructStyleData();
}
void
PresShell::RemoveSheet(nsStyleSet::sheetType aType, nsISupports* aSheet)
{
nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
if (!sheet) {
return;
}
mStyleSet->RemoveStyleSheet(aType, sheet);
ReconstructStyleData();
}
NS_IMETHODIMP
PresShell::SetDisplaySelection(int16_t aToggle)
{
mSelection->SetDisplaySelection(aToggle);
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetDisplaySelection(int16_t *aToggle)
{
*aToggle = mSelection->GetDisplaySelection();
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetSelection(SelectionType aType, nsISelection **aSelection)
{
if (!aSelection || !mSelection)
return NS_ERROR_NULL_POINTER;
*aSelection = mSelection->GetSelection(aType);
if (!(*aSelection))
return NS_ERROR_INVALID_ARG;
NS_ADDREF(*aSelection);
return NS_OK;
}
Selection*
PresShell::GetCurrentSelection(SelectionType aType)
{
if (!mSelection)
return nullptr;
return mSelection->GetSelection(aType);
}
NS_IMETHODIMP
PresShell::ScrollSelectionIntoView(SelectionType aType, SelectionRegion aRegion,
int16_t aFlags)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
return mSelection->ScrollSelectionIntoView(aType, aRegion, aFlags);
}
NS_IMETHODIMP
PresShell::RepaintSelection(SelectionType aType)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
return mSelection->RepaintSelection(aType);
}
// Make shell be a document observer
void
PresShell::BeginObservingDocument()
{
if (mDocument && !mIsDestroying) {
mDocument->AddObserver(this);
if (mIsDocumentGone) {
NS_WARNING("Adding a presshell that was disconnected from the document "
"as a document observer? Sounds wrong...");
mIsDocumentGone = false;
}
}
}
// Make shell stop being a document observer
void
PresShell::EndObservingDocument()
{
// XXXbz do we need to tell the frame constructor that the document
// is gone, perhaps? Except for printing it's NOT gone, sometimes.
mIsDocumentGone = true;
if (mDocument) {
mDocument->RemoveObserver(this);
}
}
#ifdef DEBUG_kipp
char* nsPresShell_ReflowStackPointerTop;
#endif
nsresult
PresShell::Initialize(nscoord aWidth, nscoord aHeight)
{
if (mIsDestroying) {
return NS_OK;
}
if (!mDocument) {
// Nothing to do
return NS_OK;
}
mozilla::TimeStamp timerStart = mozilla::TimeStamp::Now();
NS_ASSERTION(!mDidInitialize, "Why are we being called?");
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
mDidInitialize = true;
#ifdef DEBUG
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
if (mDocument) {
nsIURI *uri = mDocument->GetDocumentURI();
if (uri) {
nsAutoCString url;
uri->GetSpec(url);
printf("*** PresShell::Initialize (this=%p, url='%s')\n", (void*)this, url.get());
}
}
}
#endif
// XXX Do a full invalidate at the beginning so that invalidates along
// the way don't have region accumulation issues?
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// Get the root frame from the frame manager
// XXXbz it would be nice to move this somewhere else... like frame manager
// Init(), say. But we need to make sure our views are all set up by the
// time we do this!
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(!rootFrame, "How did that happen, exactly?");
if (!rootFrame) {
nsAutoScriptBlocker scriptBlocker;
mFrameConstructor->BeginUpdate();
rootFrame = mFrameConstructor->ConstructRootFrame();
mFrameConstructor->SetRootFrame(rootFrame);
mFrameConstructor->EndUpdate();
}
NS_ENSURE_STATE(!mHaveShutDown);
if (!rootFrame) {
return NS_ERROR_OUT_OF_MEMORY;
}
nsIFrame* invalidateFrame = nullptr;
for (nsIFrame* f = rootFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
if (f->GetStateBits() & NS_FRAME_NO_COMPONENT_ALPHA) {
invalidateFrame = f;
f->RemoveStateBits(NS_FRAME_NO_COMPONENT_ALPHA);
}
nsCOMPtr<nsIPresShell> shell;
if (f->GetType() == nsGkAtoms::subDocumentFrame &&
(shell = static_cast<nsSubDocumentFrame*>(f)->GetSubdocumentPresShellForPainting(0)) &&
shell->GetPresContext()->IsRootContentDocument()) {
// Root content documents build a 'force active' layer, and component alpha flattening
// can't be propagated across that so no need to invalidate above this frame.
break;
}
}
if (invalidateFrame) {
invalidateFrame->InvalidateFrameSubtree();
}
Element *root = mDocument->GetRootElement();
if (root) {
{
nsAutoCauseReflowNotifier reflowNotifier(this);
mFrameConstructor->BeginUpdate();
// Have the style sheet processor construct frame for the root
// content object down
mFrameConstructor->ContentInserted(nullptr, root, nullptr, false);
VERIFY_STYLE_TREE;
// Something in mFrameConstructor->ContentInserted may have caused
// Destroy() to get called, bug 337586.
NS_ENSURE_STATE(!mHaveShutDown);
mFrameConstructor->EndUpdate();
}
// nsAutoScriptBlocker going out of scope may have killed us too
NS_ENSURE_STATE(!mHaveShutDown);
// Run the XBL binding constructors for any new frames we've constructed
mDocument->BindingManager()->ProcessAttachedQueue();
// Constructors may have killed us too
NS_ENSURE_STATE(!mHaveShutDown);
// Now flush out pending restyles before we actually reflow, in
// case XBL constructors changed styles somewhere.
{
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
// And that might have run _more_ XBL constructors
NS_ENSURE_STATE(!mHaveShutDown);
}
NS_ASSERTION(rootFrame, "How did that happen?");
// Note: when the frame was created above it had the NS_FRAME_IS_DIRTY bit
// set, but XBL processing could have caused a reflow which clears it.
if (MOZ_LIKELY(rootFrame->GetStateBits() & NS_FRAME_IS_DIRTY)) {
// Unset the DIRTY bits so that FrameNeedsReflow() will work right.
rootFrame->RemoveStateBits(NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
NS_ASSERTION(!mDirtyRoots.Contains(rootFrame),
"Why is the root in mDirtyRoots already?");
FrameNeedsReflow(rootFrame, eResize, NS_FRAME_IS_DIRTY);
NS_ASSERTION(mDirtyRoots.Contains(rootFrame),
"Should be in mDirtyRoots now");
NS_ASSERTION(mReflowScheduled, "Why no reflow scheduled?");
}
// Restore our root scroll position now if we're getting here after EndLoad
// got called, since this is our one chance to do it. Note that we need not
// have reflowed for this to work; when the scrollframe is finally reflowed
// it'll pick up the position we store in it here.
if (!mDocumentLoading) {
RestoreRootScrollPosition();
}
// For printing, we just immediately unsuppress.
if (!mPresContext->IsPaginated()) {
// Kick off a one-shot timer based off our pref value. When this timer
// fires, if painting is still locked down, then we will go ahead and
// trigger a full invalidate and allow painting to proceed normally.
mPaintingSuppressed = true;
// Don't suppress painting if the document isn't loading.
nsIDocument::ReadyState readyState = mDocument->GetReadyStateEnum();
if (readyState != nsIDocument::READYSTATE_COMPLETE) {
mPaintSuppressionTimer = do_CreateInstance("@mozilla.org/timer;1");
}
if (!mPaintSuppressionTimer) {
mPaintingSuppressed = false;
} else {
// Initialize the timer.
// Default to PAINTLOCK_EVENT_DELAY if we can't get the pref value.
int32_t delay =
Preferences::GetInt("nglayout.initialpaint.delay",
PAINTLOCK_EVENT_DELAY);
mPaintSuppressionTimer->InitWithFuncCallback(sPaintSuppressionCallback,
this, delay,
nsITimer::TYPE_ONE_SHOT);
}
}
if (root && root->IsXUL()) {
mozilla::Telemetry::AccumulateTimeDelta(Telemetry::XUL_INITIAL_FRAME_CONSTRUCTION,
timerStart);
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::sPaintSuppressionCallback(nsITimer *aTimer, void* aPresShell)
{
nsRefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
if (self)
self->UnsuppressPainting();
}
void
PresShell::AsyncResizeEventCallback(nsITimer* aTimer, void* aPresShell)
{
static_cast<PresShell*>(aPresShell)->FireResizeEvent();
}
nsresult
PresShell::ResizeReflowOverride(nscoord aWidth, nscoord aHeight)
{
mViewportOverridden = true;
return ResizeReflowIgnoreOverride(aWidth, aHeight);
}
nsresult
PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight)
{
if (mViewportOverridden) {
// The viewport has been overridden, and this reflow request
// didn't ask to ignore the override. Pretend it didn't happen.
return NS_OK;
}
return ResizeReflowIgnoreOverride(aWidth, aHeight);
}
nsresult
PresShell::ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight)
{
NS_PRECONDITION(!mIsReflowing, "Shouldn't be in reflow here!");
NS_PRECONDITION(aWidth != NS_UNCONSTRAINEDSIZE,
"shouldn't use unconstrained widths anymore");
// If we don't have a root frame yet, that means we haven't had our initial
// reflow... If that's the case, and aWidth or aHeight is unconstrained,
// ignore them altogether.
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame && aHeight == NS_UNCONSTRAINEDSIZE) {
// We can't do the work needed for SizeToContent without a root
// frame, and we want to return before setting the visible area.
return NS_ERROR_NOT_AVAILABLE;
}
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// There isn't anything useful we can do if the initial reflow hasn't happened.
if (!rootFrame) {
return NS_OK;
}
nsRefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
// Take this ref after viewManager so it'll make sure to go away first.
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
if (!GetPresContext()->SupressingResizeReflow()) {
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
// Make sure style is up to date
{
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
rootFrame = mFrameConstructor->GetRootFrame();
if (!mIsDestroying && rootFrame) {
// XXX Do a full invalidate at the beginning so that invalidates along
// the way don't have region accumulation issues?
{
nsAutoCauseReflowNotifier crNotifier(this);
WillDoReflow();
// Kick off a top-down reflow
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
mDirtyRoots.RemoveElement(rootFrame);
DoReflow(rootFrame, true);
}
DidDoReflow(true, false);
}
}
rootFrame = mFrameConstructor->GetRootFrame();
if (aHeight == NS_UNCONSTRAINEDSIZE && rootFrame) {
mPresContext->SetVisibleArea(
nsRect(0, 0, aWidth, rootFrame->GetRect().height));
}
if (!mIsDestroying && !mResizeEvent.IsPending() &&
!mAsyncResizeTimerIsActive) {
if (mInResize) {
if (!mAsyncResizeEventTimer) {
mAsyncResizeEventTimer = do_CreateInstance("@mozilla.org/timer;1");
}
if (mAsyncResizeEventTimer) {
mAsyncResizeTimerIsActive = true;
mAsyncResizeEventTimer->InitWithFuncCallback(AsyncResizeEventCallback,
this, 15,
nsITimer::TYPE_ONE_SHOT);
}
} else {
nsRefPtr<nsRunnableMethod<PresShell> > resizeEvent =
NS_NewRunnableMethod(this, &PresShell::FireResizeEvent);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(resizeEvent))) {
mResizeEvent = resizeEvent;
mDocument->SetNeedStyleFlush();
}
}
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::FireResizeEvent()
{
if (mAsyncResizeTimerIsActive) {
mAsyncResizeTimerIsActive = false;
mAsyncResizeEventTimer->Cancel();
}
mResizeEvent.Revoke();
if (mIsDocumentGone)
return;
//Send resize event from here.
WidgetEvent event(true, NS_RESIZE_EVENT);
nsEventStatus status = nsEventStatus_eIgnore;
nsPIDOMWindow *window = mDocument->GetWindow();
if (window) {
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
mInResize = true;
EventDispatcher::Dispatch(window, mPresContext, &event, nullptr, &status);
mInResize = false;
}
}
void
PresShell::SetIgnoreFrameDestruction(bool aIgnore)
{
if (mDocument) {
// We need to tell the ImageLoader to drop all its references to frames
// because they're about to go away and it won't get notifications of that.
mDocument->StyleImageLoader()->ClearFrames(mPresContext);
}
mIgnoreFrameDestruction = aIgnore;
}
void
PresShell::NotifyDestroyingFrame(nsIFrame* aFrame)
{
if (!mIgnoreFrameDestruction) {
mDocument->StyleImageLoader()->DropRequestsForFrame(aFrame);
mFrameConstructor->NotifyDestroyingFrame(aFrame);
for (int32_t idx = mDirtyRoots.Length(); idx; ) {
--idx;
if (mDirtyRoots[idx] == aFrame) {
mDirtyRoots.RemoveElementAt(idx);
}
}
// Remove frame properties
mPresContext->NotifyDestroyingFrame(aFrame);
if (aFrame == mCurrentEventFrame) {
mCurrentEventContent = aFrame->GetContent();
mCurrentEventFrame = nullptr;
}
#ifdef DEBUG
if (aFrame == mDrawEventTargetFrame) {
mDrawEventTargetFrame = nullptr;
}
#endif
for (unsigned int i=0; i < mCurrentEventFrameStack.Length(); i++) {
if (aFrame == mCurrentEventFrameStack.ElementAt(i)) {
//One of our stack frames was deleted. Get its content so that when we
//pop it we can still get its new frame from its content
nsIContent *currentEventContent = aFrame->GetContent();
mCurrentEventContentStack.ReplaceObjectAt(currentEventContent, i);
mCurrentEventFrameStack[i] = nullptr;
}
}
mFramesToDirty.RemoveEntry(aFrame);
} else {
// We must delete this property in situ so that its destructor removes the
// frame from FrameLayerBuilder::DisplayItemData::mFrameList -- otherwise
// the DisplayItemData destructor will use the destroyed frame when it
// tries to remove it from the (array) value of this property.
mPresContext->PropertyTable()->
Delete(aFrame, FrameLayerBuilder::LayerManagerDataProperty());
}
}
already_AddRefed<nsCaret> PresShell::GetCaret() const
{
nsRefPtr<nsCaret> caret = mCaret;
return caret.forget();
}
// TouchCaret
already_AddRefed<TouchCaret> PresShell::GetTouchCaret() const
{
nsRefPtr<TouchCaret> touchCaret = mTouchCaret;
return touchCaret.forget();
}
already_AddRefed<SelectionCarets> PresShell::GetSelectionCarets() const
{
nsRefPtr<SelectionCarets> selectionCaret = mSelectionCarets;
return selectionCaret.forget();
}
void PresShell::SetCaret(nsCaret *aNewCaret)
{
mCaret = aNewCaret;
}
void PresShell::RestoreCaret()
{
mCaret = mOriginalCaret;
}
NS_IMETHODIMP PresShell::SetCaretEnabled(bool aInEnable)
{
bool oldEnabled = mCaretEnabled;
mCaretEnabled = aInEnable;
if (mCaretEnabled != oldEnabled)
{
MOZ_ASSERT(mCaret);
if (mCaret) {
mCaret->SetVisible(mCaretEnabled);
}
}
// We should sync touch caret's visibility with caret every time since touch
// caret might be hidden due to timeout while caret is enabled.
if (mTouchCaret) {
mTouchCaret->SyncVisibilityWithCaret();
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretReadOnly(bool aReadOnly)
{
if (mCaret)
mCaret->SetCaretReadOnly(aReadOnly);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretEnabled(bool *aOutEnabled)
{
NS_ENSURE_ARG_POINTER(aOutEnabled);
*aOutEnabled = mCaretEnabled;
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretVisibilityDuringSelection(bool aVisibility)
{
if (mCaret)
mCaret->SetVisibilityDuringSelection(aVisibility);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretVisible(bool *aOutIsVisible)
{
*aOutIsVisible = false;
if (mCaret) {
*aOutIsVisible = mCaret->IsVisible();
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetSelectionFlags(int16_t aInEnable)
{
mSelectionFlags = aInEnable;
return NS_OK;
}
NS_IMETHODIMP PresShell::GetSelectionFlags(int16_t *aOutEnable)
{
if (!aOutEnable)
return NS_ERROR_INVALID_ARG;
*aOutEnable = mSelectionFlags;
return NS_OK;
}
//implementation of nsISelectionController
NS_IMETHODIMP
PresShell::PhysicalMove(int16_t aDirection, int16_t aAmount, bool aExtend)
{
return mSelection->PhysicalMove(aDirection, aAmount, aExtend);
}
NS_IMETHODIMP
PresShell::CharacterMove(bool aForward, bool aExtend)
{
return mSelection->CharacterMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::CharacterExtendForDelete()
{
return mSelection->CharacterExtendForDelete();
}
NS_IMETHODIMP
PresShell::CharacterExtendForBackspace()
{
return mSelection->CharacterExtendForBackspace();
}
NS_IMETHODIMP
PresShell::WordMove(bool aForward, bool aExtend)
{
nsresult result = mSelection->WordMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result))
result = CompleteMove(aForward, aExtend);
return result;
}
NS_IMETHODIMP
PresShell::WordExtendForDelete(bool aForward)
{
return mSelection->WordExtendForDelete(aForward);
}
NS_IMETHODIMP
PresShell::LineMove(bool aForward, bool aExtend)
{
nsresult result = mSelection->LineMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result))
result = CompleteMove(aForward,aExtend);
return result;
}
NS_IMETHODIMP
PresShell::IntraLineMove(bool aForward, bool aExtend)
{
return mSelection->IntraLineMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::PageMove(bool aForward, bool aExtend)
{
nsIScrollableFrame *scrollableFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (!scrollableFrame)
return NS_OK;
mSelection->CommonPageMove(aForward, aExtend, scrollableFrame);
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS);
}
NS_IMETHODIMP
PresShell::ScrollPage(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::PAGES,
nsIScrollableFrame::SMOOTH);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollLine(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
int32_t lineCount = Preferences::GetInt("toolkit.scrollbox.verticalScrollDistance",
NS_DEFAULT_VERTICAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? lineCount : -lineCount),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollCharacter(bool aRight)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eHorizontal);
if (scrollFrame) {
int32_t h = Preferences::GetInt("toolkit.scrollbox.horizontalScrollDistance",
NS_DEFAULT_HORIZONTAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(aRight ? h : -h, 0),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteScroll(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::WHOLE,
nsIScrollableFrame::SMOOTH);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteMove(bool aForward, bool aExtend)
{
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
nsIContent* limiter = mSelection->GetAncestorLimiter();
nsIFrame* frame = limiter ? limiter->GetPrimaryFrame()
: FrameConstructor()->GetRootElementFrame();
if (!frame)
return NS_ERROR_FAILURE;
nsIFrame::CaretPosition pos =
frame->GetExtremeCaretPosition(!aForward);
mSelection->HandleClick(pos.mResultContent, pos.mContentOffset,
pos.mContentOffset, aExtend, false,
aForward ? CARET_ASSOCIATE_AFTER : CARET_ASSOCIATE_BEFORE);
if (limiter) {
// HandleClick resets ancestorLimiter, so set it again.
mSelection->SetAncestorLimiter(limiter);
}
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS);
}
NS_IMETHODIMP
PresShell::SelectAll()
{
return mSelection->SelectAll();
}
static void
DoCheckVisibility(nsPresContext* aPresContext,
nsIContent* aNode,
int16_t aStartOffset,
int16_t aEndOffset,
bool* aRetval)
{
nsIFrame* frame = aNode->GetPrimaryFrame();
if (!frame) {
// No frame to look at so it must not be visible.
return;
}
// Start process now to go through all frames to find startOffset. Then check
// chars after that to see if anything until EndOffset is visible.
bool finished = false;
frame->CheckVisibility(aPresContext, aStartOffset, aEndOffset, true,
&finished, aRetval);
// Don't worry about other return value.
}
NS_IMETHODIMP
PresShell::CheckVisibility(nsIDOMNode *node, int16_t startOffset, int16_t EndOffset, bool *_retval)
{
if (!node || startOffset>EndOffset || !_retval || startOffset<0 || EndOffset<0)
return NS_ERROR_INVALID_ARG;
*_retval = false; //initialize return parameter
nsCOMPtr<nsIContent> content(do_QueryInterface(node));
if (!content)
return NS_ERROR_FAILURE;
DoCheckVisibility(mPresContext, content, startOffset, EndOffset, _retval);
return NS_OK;
}
nsresult
PresShell::CheckVisibilityContent(nsIContent* aNode, int16_t aStartOffset,
int16_t aEndOffset, bool* aRetval)
{
if (!aNode || aStartOffset > aEndOffset || !aRetval ||
aStartOffset < 0 || aEndOffset < 0) {
return NS_ERROR_INVALID_ARG;
}
*aRetval = false;
DoCheckVisibility(mPresContext, aNode, aStartOffset, aEndOffset, aRetval);
return NS_OK;
}
//end implementations nsISelectionController
nsIFrame*
nsIPresShell::GetRootFrameExternal() const
{
return mFrameConstructor->GetRootFrame();
}
nsIFrame*
nsIPresShell::GetRootScrollFrame() const
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
// Ensure root frame is a viewport frame
if (!rootFrame || nsGkAtoms::viewportFrame != rootFrame->GetType())
return nullptr;
nsIFrame* theFrame = rootFrame->GetFirstPrincipalChild();
if (!theFrame || nsGkAtoms::scrollFrame != theFrame->GetType())
return nullptr;
return theFrame;
}
nsIScrollableFrame*
nsIPresShell::GetRootScrollFrameAsScrollable() const
{
nsIFrame* frame = GetRootScrollFrame();
if (!frame)
return nullptr;
nsIScrollableFrame* scrollableFrame = do_QueryFrame(frame);
NS_ASSERTION(scrollableFrame,
"All scroll frames must implement nsIScrollableFrame");
return scrollableFrame;
}
nsIScrollableFrame*
nsIPresShell::GetRootScrollFrameAsScrollableExternal() const
{
return GetRootScrollFrameAsScrollable();
}
nsIPageSequenceFrame*
PresShell::GetPageSequenceFrame() const
{
nsIFrame* frame = mFrameConstructor->GetPageSequenceFrame();
return do_QueryFrame(frame);
}
nsCanvasFrame*
PresShell::GetCanvasFrame() const
{
nsIFrame* frame = mFrameConstructor->GetDocElementContainingBlock();
return do_QueryFrame(frame);
}
Element*
PresShell::GetTouchCaretElement() const
{
return GetCanvasFrame() ? GetCanvasFrame()->GetTouchCaretElement() : nullptr;
}
void
PresShell::SetMayHaveTouchCaret(bool aSet)
{
if (!mPresContext) {
return;
}
if (!mPresContext->IsRoot()) {
nsIPresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->SetMayHaveTouchCaret(aSet);
}
return;
}
nsIDocument* document = GetDocument();
if (document) {
nsPIDOMWindow* innerWin = document->GetInnerWindow();
if (innerWin) {
innerWin->SetMayHaveTouchCaret(aSet);
}
}
}
bool
PresShell::MayHaveTouchCaret()
{
if (!mPresContext) {
return false;
}
if (!mPresContext->IsRoot()) {
nsIPresShell* rootPresShell = GetRootPresShell();
return rootPresShell ? rootPresShell->MayHaveTouchCaret() : false;
}
nsIDocument* document = GetDocument();
if (document) {
nsPIDOMWindow* innerWin = document->GetInnerWindow();
if (innerWin) {
return innerWin->MayHaveTouchCaret();
}
}
return false;
}
Element*
PresShell::GetSelectionCaretsStartElement() const
{
return GetCanvasFrame() ? GetCanvasFrame()->GetSelectionCaretsStartElement() : nullptr;
}
Element*
PresShell::GetSelectionCaretsEndElement() const
{
return GetCanvasFrame() ? GetCanvasFrame()->GetSelectionCaretsEndElement() : nullptr;
}
void
PresShell::BeginUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
{
#ifdef DEBUG
mUpdateCount++;
#endif
mFrameConstructor->BeginUpdate();
if (aUpdateType & UPDATE_STYLE)
mStyleSet->BeginUpdate();
}
void
PresShell::EndUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
{
#ifdef DEBUG
NS_PRECONDITION(0 != mUpdateCount, "too many EndUpdate's");
--mUpdateCount;
#endif
if (aUpdateType & UPDATE_STYLE) {
mStyleSet->EndUpdate();
if (mStylesHaveChanged || !mChangedScopeStyleRoots.IsEmpty())
ReconstructStyleData();
}
mFrameConstructor->EndUpdate();
}
void
PresShell::RestoreRootScrollPosition()
{
nsIScrollableFrame* scrollableFrame = GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
scrollableFrame->ScrollToRestoredPosition();
}
}
void
PresShell::MaybeReleaseCapturingContent()
{
nsRefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (frameSelection) {
frameSelection->SetDragState(false);
}
if (gCaptureInfo.mContent &&
gCaptureInfo.mContent->OwnerDoc() == mDocument) {
SetCapturingContent(nullptr, 0);
}
}
void
PresShell::BeginLoad(nsIDocument *aDocument)
{
mDocumentLoading = true;
#ifdef PR_LOGGING
gfxTextPerfMetrics *tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
bool shouldLog = gLog && PR_LOG_TEST(gLog, PR_LOG_DEBUG);
if (shouldLog || tp) {
mLoadBegin = TimeStamp::Now();
}
if (shouldLog) {
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString spec;
if (uri) {
uri->GetSpec(spec);
}
PR_LOG(gLog, PR_LOG_DEBUG,
("(presshell) %p load begin [%s]\n",
this, spec.get()));
}
#endif
}
void
PresShell::EndLoad(nsIDocument *aDocument)
{
NS_PRECONDITION(aDocument == mDocument, "Wrong document");
RestoreRootScrollPosition();
mDocumentLoading = false;
}
void
PresShell::LoadComplete()
{
#ifdef PR_LOGGING
gfxTextPerfMetrics *tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
// log load
bool shouldLog = gLog && PR_LOG_TEST(gLog, PR_LOG_DEBUG);
if (shouldLog || tp) {
TimeDuration loadTime = TimeStamp::Now() - mLoadBegin;
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString spec;
if (uri) {
uri->GetSpec(spec);
}
if (shouldLog) {
PR_LOG(gLog, PR_LOG_DEBUG,
("(presshell) %p load done time-ms: %9.2f [%s]\n",
this, loadTime.ToMilliseconds(), spec.get()));
}
if (tp) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, loadTime.ToMilliseconds(),
eLog_loaddone, spec.get());
}
}
}
#endif
}
#ifdef DEBUG
void
PresShell::VerifyHasDirtyRootAncestor(nsIFrame* aFrame)
{
// XXXbz due to bug 372769, can't actually assert anything here...
return;
// XXXbz shouldn't need this part; remove it once FrameNeedsReflow
// handles the root frame correctly.
if (!aFrame->GetParent()) {
return;
}
// Make sure that there is a reflow root ancestor of |aFrame| that's
// in mDirtyRoots already.
while (aFrame && (aFrame->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN)) {
if (((aFrame->GetStateBits() & NS_FRAME_REFLOW_ROOT) ||
!aFrame->GetParent()) &&
mDirtyRoots.Contains(aFrame)) {
return;
}
aFrame = aFrame->GetParent();
}
NS_NOTREACHED("Frame has dirty bits set but isn't scheduled to be "
"reflowed?");
}
#endif
void
PresShell::FrameNeedsReflow(nsIFrame *aFrame, IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd)
{
NS_PRECONDITION(aBitToAdd == NS_FRAME_IS_DIRTY ||
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN ||
!aBitToAdd,
"Unexpected bits being added");
NS_PRECONDITION(!(aIntrinsicDirty == eStyleChange &&
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN),
"bits don't correspond to style change reason");
NS_ASSERTION(!mIsReflowing, "can't mark frame dirty during reflow");
// If we've not yet done the initial reflow, then don't bother
// enqueuing a reflow command yet.
if (! mDidInitialize)
return;
// If we're already destroying, don't bother with this either.
if (mIsDestroying)
return;
#ifdef DEBUG
//printf("gShellCounter: %d\n", gShellCounter++);
if (mInVerifyReflow)
return;
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
printf("\nPresShell@%p: frame %p needs reflow\n", (void*)this, (void*)aFrame);
if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
printf("Current content model:\n");
Element *rootElement = mDocument->GetRootElement();
if (rootElement) {
rootElement->List(stdout, 0);
}
}
}
#endif
nsAutoTArray<nsIFrame*, 4> subtrees;
subtrees.AppendElement(aFrame);
do {
nsIFrame *subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
subtrees.RemoveElementAt(subtrees.Length() - 1);
// Grab |wasDirty| now so we can go ahead and update the bits on
// subtreeRoot.
bool wasDirty = NS_SUBTREE_DIRTY(subtreeRoot);
subtreeRoot->AddStateBits(aBitToAdd);
// Now if subtreeRoot is a reflow root we can cut off this reflow at it if
// the bit being added is NS_FRAME_HAS_DIRTY_CHILDREN.
bool targetFrameDirty = (aBitToAdd == NS_FRAME_IS_DIRTY);
#define FRAME_IS_REFLOW_ROOT(_f) \
((_f->GetStateBits() & NS_FRAME_REFLOW_ROOT) && \
(_f != subtreeRoot || !targetFrameDirty))
// Mark the intrinsic widths as dirty on the frame, all of its ancestors,
// and all of its descendants, if needed:
if (aIntrinsicDirty != eResize) {
// Mark argument and all ancestors dirty. (Unless we hit a reflow
// root that should contain the reflow. That root could be
// subtreeRoot itself if it's not dirty, or it could be some
// ancestor of subtreeRoot.)
for (nsIFrame *a = subtreeRoot;
a && !FRAME_IS_REFLOW_ROOT(a);
a = a->GetParent())
a->MarkIntrinsicISizesDirty();
}
if (aIntrinsicDirty == eStyleChange) {
// Mark all descendants dirty (using an nsTArray stack rather than
// recursion).
// Note that nsHTMLReflowState::InitResizeFlags has some similar
// code; see comments there for how and why it differs.
nsAutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(subtreeRoot);
do {
nsIFrame *f = stack.ElementAt(stack.Length() - 1);
stack.RemoveElementAt(stack.Length() - 1);
if (f->GetType() == nsGkAtoms::placeholderFrame) {
nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
// We have another distinct subtree we need to mark.
subtrees.AppendElement(oof);
}
}
nsIFrame::ChildListIterator lists(f);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* kid = childFrames.get();
kid->MarkIntrinsicISizesDirty();
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
}
// Skip setting dirty bits up the tree if we weren't given a bit to add.
if (!aBitToAdd) {
continue;
}
// Set NS_FRAME_HAS_DIRTY_CHILDREN bits (via nsIFrame::ChildIsDirty)
// up the tree until we reach either a frame that's already dirty or
// a reflow root.
nsIFrame *f = subtreeRoot;
for (;;) {
if (FRAME_IS_REFLOW_ROOT(f) || !f->GetParent()) {
// we've hit a reflow root or the root frame
if (!wasDirty) {
mDirtyRoots.AppendElement(f);
mDocument->SetNeedLayoutFlush();
}
#ifdef DEBUG
else {
VerifyHasDirtyRootAncestor(f);
}
#endif
break;
}
nsIFrame *child = f;
f = f->GetParent();
wasDirty = NS_SUBTREE_DIRTY(f);
f->ChildIsDirty(child);
NS_ASSERTION(f->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN,
"ChildIsDirty didn't do its job");
if (wasDirty) {
// This frame was already marked dirty.
#ifdef DEBUG
VerifyHasDirtyRootAncestor(f);
#endif
break;
}
}
} while (subtrees.Length() != 0);
MaybeScheduleReflow();
}
void
PresShell::FrameNeedsToContinueReflow(nsIFrame *aFrame)
{
NS_ASSERTION(mIsReflowing, "Must be in reflow when marking path dirty.");
NS_PRECONDITION(mCurrentReflowRoot, "Must have a current reflow root here");
NS_ASSERTION(aFrame == mCurrentReflowRoot ||
nsLayoutUtils::IsProperAncestorFrame(mCurrentReflowRoot, aFrame),
"Frame passed in is not the descendant of mCurrentReflowRoot");
NS_ASSERTION(aFrame->GetStateBits() & NS_FRAME_IN_REFLOW,
"Frame passed in not in reflow?");
mFramesToDirty.PutEntry(aFrame);
}
nsIScrollableFrame*
nsIPresShell::GetFrameToScrollAsScrollable(
nsIPresShell::ScrollDirection aDirection)
{
nsIScrollableFrame* scrollFrame = nullptr;
nsCOMPtr<nsIContent> focusedContent;
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && mDocument) {
nsCOMPtr<nsIDOMWindow> window = do_QueryInterface(mDocument->GetWindow());
nsCOMPtr<nsIDOMElement> focusedElement;
fm->GetFocusedElementForWindow(window, false, nullptr, getter_AddRefs(focusedElement));
focusedContent = do_QueryInterface(focusedElement);
}
if (!focusedContent && mSelection) {
nsISelection* domSelection = mSelection->
GetSelection(nsISelectionController::SELECTION_NORMAL);
if (domSelection) {
nsCOMPtr<nsIDOMNode> focusedNode;
domSelection->GetFocusNode(getter_AddRefs(focusedNode));
focusedContent = do_QueryInterface(focusedNode);
}
}
if (focusedContent) {
nsIFrame* startFrame = focusedContent->GetPrimaryFrame();
if (startFrame) {
scrollFrame = startFrame->GetScrollTargetFrame();
if (scrollFrame) {
startFrame = scrollFrame->GetScrolledFrame();
}
if (aDirection == nsIPresShell::eEither) {
scrollFrame =
nsLayoutUtils::GetNearestScrollableFrame(startFrame);
} else {
scrollFrame =
nsLayoutUtils::GetNearestScrollableFrameForDirection(startFrame,
aDirection == eVertical ? nsLayoutUtils::eVertical :
nsLayoutUtils::eHorizontal);
}
}
}
if (!scrollFrame) {
scrollFrame = GetRootScrollFrameAsScrollable();
}
return scrollFrame;
}
void
PresShell::CancelAllPendingReflows()
{
mDirtyRoots.Clear();
if (mReflowScheduled) {
GetPresContext()->RefreshDriver()->RemoveLayoutFlushObserver(this);
mReflowScheduled = false;
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
void
PresShell::DestroyFramesFor(nsIContent* aContent,
nsIContent** aDestroyedFramesFor)
{
MOZ_ASSERT(aContent);
NS_ENSURE_TRUE_VOID(mPresContext);
if (!mDidInitialize) {
return;
}
nsAutoScriptBlocker scriptBlocker;
// Mark ourselves as not safe to flush while we're doing frame destruction.
++mChangeNestCount;
nsCSSFrameConstructor* fc = FrameConstructor();
fc->BeginUpdate();
fc->DestroyFramesFor(aContent, aDestroyedFramesFor);
fc->EndUpdate();
--mChangeNestCount;
}
void
PresShell::CreateFramesFor(nsIContent* aContent)
{
NS_ENSURE_TRUE_VOID(mPresContext);
if (!mDidInitialize) {
// Nothing to do here. In fact, if we proceed and aContent is the
// root we will crash.
return;
}
// Don't call RecreateFramesForContent since that is not exported and we want
// to keep the number of entrypoints down.
NS_ASSERTION(mViewManager, "Should have view manager");
MOZ_ASSERT(aContent);
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoScriptBlocker scriptBlocker;
// Mark ourselves as not safe to flush while we're doing frame construction.
++mChangeNestCount;
nsCSSFrameConstructor* fc = FrameConstructor();
nsILayoutHistoryState* layoutState = fc->GetLastCapturedLayoutHistoryState();
fc->BeginUpdate();
fc->ContentInserted(aContent->GetParent(), aContent, layoutState, false);
fc->EndUpdate();
--mChangeNestCount;
}
nsresult
PresShell::RecreateFramesFor(nsIContent* aContent)
{
NS_ENSURE_TRUE(mPresContext, NS_ERROR_FAILURE);
if (!mDidInitialize) {
// Nothing to do here. In fact, if we proceed and aContent is the
// root we will crash.
return NS_OK;
}
// Don't call RecreateFramesForContent since that is not exported and we want
// to keep the number of entrypoints down.
NS_ASSERTION(mViewManager, "Should have view manager");
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoScriptBlocker scriptBlocker;
nsStyleChangeList changeList;
changeList.AppendChange(nullptr, aContent, nsChangeHint_ReconstructFrame);
// Mark ourselves as not safe to flush while we're doing frame construction.
++mChangeNestCount;
RestyleManager* restyleManager = mPresContext->RestyleManager();
nsresult rv = restyleManager->ProcessRestyledFrames(changeList);
restyleManager->FlushOverflowChangedTracker();
--mChangeNestCount;
return rv;
}
void
nsIPresShell::PostRecreateFramesFor(Element* aElement)
{
mPresContext->RestyleManager()->PostRestyleEvent(aElement, nsRestyleHint(0),
nsChangeHint_ReconstructFrame);
}
void
nsIPresShell::RestyleForAnimation(Element* aElement, nsRestyleHint aHint)
{
mPresContext->RestyleManager()->PostAnimationRestyleEvent(aElement, aHint,
NS_STYLE_HINT_NONE);
}
void
nsIPresShell::SetForwardingContainer(const WeakPtr<nsDocShell> &aContainer)
{
mForwardingContainer = aContainer;
}
void
PresShell::ClearFrameRefs(nsIFrame* aFrame)
{
mPresContext->EventStateManager()->ClearFrameRefs(aFrame);
nsWeakFrame* weakFrame = mWeakFrames;
while (weakFrame) {
nsWeakFrame* prev = weakFrame->GetPreviousWeakFrame();
if (weakFrame->GetFrame() == aFrame) {
// This removes weakFrame from mWeakFrames.
weakFrame->Clear(this);
}
weakFrame = prev;
}
}
already_AddRefed<gfxContext>
PresShell::CreateReferenceRenderingContext()
{
nsDeviceContext* devCtx = mPresContext->DeviceContext();
nsRefPtr<gfxContext> rc;
if (mPresContext->IsScreen()) {
rc = new gfxContext(gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget());
} else {
rc = devCtx->CreateRenderingContext();
}
MOZ_ASSERT(rc, "shouldn't break promise to return non-null");
return rc.forget();
}
nsresult
PresShell::GoToAnchor(const nsAString& aAnchorName, bool aScroll,
uint32_t aAdditionalScrollFlags)
{
if (!mDocument) {
return NS_ERROR_FAILURE;
}
const Element *root = mDocument->GetRootElement();
if (root && root->IsSVG(nsGkAtoms::svg)) {
// We need to execute this even if there is an empty anchor name
// so that any existing SVG fragment identifier effect is removed
if (SVGFragmentIdentifier::ProcessFragmentIdentifier(mDocument, aAnchorName)) {
return NS_OK;
}
}
// Hold a reference to the ESM in case event dispatch tears us down.
nsRefPtr<EventStateManager> esm = mPresContext->EventStateManager();
if (aAnchorName.IsEmpty()) {
NS_ASSERTION(!aScroll, "can't scroll to empty anchor name");
esm->SetContentState(nullptr, NS_EVENT_STATE_URLTARGET);
return NS_OK;
}
nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
nsresult rv = NS_OK;
nsCOMPtr<nsIContent> content;
// Search for an element with a matching "id" attribute
if (mDocument) {
content = mDocument->GetElementById(aAnchorName);
}
// Search for an anchor element with a matching "name" attribute
if (!content && htmlDoc) {
nsCOMPtr<nsIDOMNodeList> list;
// Find a matching list of named nodes
rv = htmlDoc->GetElementsByName(aAnchorName, getter_AddRefs(list));
if (NS_SUCCEEDED(rv) && list) {
uint32_t i;
// Loop through the named nodes looking for the first anchor
for (i = 0; true; i++) {
nsCOMPtr<nsIDOMNode> node;
rv = list->Item(i, getter_AddRefs(node));
if (!node) { // End of list
break;
}
// Ensure it's an anchor element
content = do_QueryInterface(node);
if (content) {
if (content->Tag() == nsGkAtoms::a && content->IsHTML()) {
break;
}
content = nullptr;
}
}
}
}
// Search for anchor in the HTML namespace with a matching name
if (!content && !htmlDoc)
{
nsCOMPtr<nsIDOMDocument> doc = do_QueryInterface(mDocument);
nsCOMPtr<nsIDOMNodeList> list;
NS_NAMED_LITERAL_STRING(nameSpace, "http://www.w3.org/1999/xhtml");
// Get the list of anchor elements
rv = doc->GetElementsByTagNameNS(nameSpace, NS_LITERAL_STRING("a"), getter_AddRefs(list));
if (NS_SUCCEEDED(rv) && list) {
uint32_t i;
// Loop through the named nodes looking for the first anchor
for (i = 0; true; i++) {
nsCOMPtr<nsIDOMNode> node;
rv = list->Item(i, getter_AddRefs(node));
if (!node) { // End of list
break;
}
// Compare the name attribute
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(node);
nsAutoString value;
if (element && NS_SUCCEEDED(element->GetAttribute(NS_LITERAL_STRING("name"), value))) {
if (value.Equals(aAnchorName)) {
content = do_QueryInterface(element);
break;
}
}
}
}
}
esm->SetContentState(content, NS_EVENT_STATE_URLTARGET);
#ifdef ACCESSIBILITY
nsIContent *anchorTarget = content;
#endif
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (rootScroll && rootScroll->DidHistoryRestore()) {
// Scroll position restored from history trumps scrolling to anchor.
aScroll = false;
rootScroll->ClearDidHistoryRestore();
}
if (content) {
if (aScroll) {
rv = ScrollContentIntoView(content,
ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
ScrollAxis(),
ANCHOR_SCROLL_FLAGS | aAdditionalScrollFlags);
NS_ENSURE_SUCCESS(rv, rv);
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (rootScroll) {
mLastAnchorScrolledTo = content;
mLastAnchorScrollPositionY = rootScroll->GetScrollPosition().y;
}
}
// Should we select the target? This action is controlled by a
// preference: the default is to not select.
bool selectAnchor = Preferences::GetBool("layout.selectanchor");
// Even if select anchor pref is false, we must still move the
// caret there. That way tabbing will start from the new
// location
nsRefPtr<nsIDOMRange> jumpToRange = new nsRange(mDocument);
while (content && content->GetFirstChild()) {
content = content->GetFirstChild();
}
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(content));
NS_ASSERTION(node, "No nsIDOMNode for descendant of anchor");
jumpToRange->SelectNodeContents(node);
// Select the anchor
nsISelection* sel = mSelection->
GetSelection(nsISelectionController::SELECTION_NORMAL);
if (sel) {
sel->RemoveAllRanges();
sel->AddRange(jumpToRange);
if (!selectAnchor) {
// Use a caret (collapsed selection) at the start of the anchor
sel->CollapseToStart();
}
}
// Selection is at anchor.
// Now focus the document itself if focus is on an element within it.
nsPIDOMWindow *win = mDocument->GetWindow();
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && win) {
nsCOMPtr<nsIDOMWindow> focusedWindow;
fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
if (SameCOMIdentity(win, focusedWindow)) {
fm->ClearFocus(focusedWindow);
}
}
// If the target is an animation element, activate the animation
if (content->IsNodeOfType(nsINode::eANIMATION)) {
SVGContentUtils::ActivateByHyperlink(content.get());
}
} else {
rv = NS_ERROR_FAILURE;
NS_NAMED_LITERAL_STRING(top, "top");
if (nsContentUtils::EqualsIgnoreASCIICase(aAnchorName, top)) {
// Scroll to the top/left if aAnchorName is "top" and there is no element
// with such a name or id.
rv = NS_OK;
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
// Check |aScroll| after setting |rv| so we set |rv| to the same
// thing whether or not |aScroll| is true.
if (aScroll && sf) {
// Scroll to the top of the page
sf->ScrollTo(nsPoint(0, 0), nsIScrollableFrame::INSTANT);
}
}
}
#ifdef ACCESSIBILITY
if (anchorTarget) {
nsAccessibilityService* accService = AccService();
if (accService)
accService->NotifyOfAnchorJumpTo(anchorTarget);
}
#endif
return rv;
}
nsresult
PresShell::ScrollToAnchor()
{
if (!mLastAnchorScrolledTo) {
return NS_OK;
}
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (!rootScroll ||
mLastAnchorScrollPositionY != rootScroll->GetScrollPosition().y) {
return NS_OK;
}
nsresult rv = ScrollContentIntoView(mLastAnchorScrolledTo,
ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
ScrollAxis(),
ANCHOR_SCROLL_FLAGS);
mLastAnchorScrolledTo = nullptr;
return rv;
}
/*
* Helper (per-continuation) for ScrollContentIntoView.
*
* @param aContainerFrame [in] the frame which aRect is relative to
* @param aFrame [in] Frame whose bounds should be unioned
* @param aUseWholeLineHeightForInlines [in] if true, then for inline frames
* we should include the top of the line in the added rectangle
* @param aRect [inout] rect into which its bounds should be unioned
* @param aHaveRect [inout] whether aRect contains data yet
* @param aPrevBlock [inout] the block aLines is a line iterator for
* @param aLines [inout] the line iterator we're using
* @param aCurLine [inout] the line to start looking from in this iterator
*/
static void
AccumulateFrameBounds(nsIFrame* aContainerFrame,
nsIFrame* aFrame,
bool aUseWholeLineHeightForInlines,
nsRect& aRect,
bool& aHaveRect,
nsIFrame*& aPrevBlock,
nsAutoLineIterator& aLines,
int32_t& aCurLine)
{
nsIFrame* frame = aFrame;
nsRect frameBounds = nsRect(nsPoint(0, 0), aFrame->GetSize());
// If this is an inline frame and either the bounds height is 0 (quirks
// layout model) or aUseWholeLineHeightForInlines is set, we need to
// change the top of the bounds to include the whole line.
if (frameBounds.height == 0 || aUseWholeLineHeightForInlines) {
nsIFrame *prevFrame = aFrame;
nsIFrame *f = aFrame;
while (f && f->IsFrameOfType(nsIFrame::eLineParticipant) &&
!f->IsTransformed() && !f->IsPositioned()) {
prevFrame = f;
f = prevFrame->GetParent();
}
if (f != aFrame &&
f &&
f->GetType() == nsGkAtoms::blockFrame) {
// find the line containing aFrame and increase the top of |offset|.
if (f != aPrevBlock) {
aLines = f->GetLineIterator();
aPrevBlock = f;
aCurLine = 0;
}
if (aLines) {
int32_t index = aLines->FindLineContaining(prevFrame, aCurLine);
if (index >= 0) {
aCurLine = index;
nsIFrame *trash1;
int32_t trash2;
nsRect lineBounds;
uint32_t trash3;
if (NS_SUCCEEDED(aLines->GetLine(index, &trash1, &trash2,
lineBounds, &trash3))) {
frameBounds += frame->GetOffsetTo(f);
frame = f;
if (lineBounds.y < frameBounds.y) {
frameBounds.height = frameBounds.YMost() - lineBounds.y;
frameBounds.y = lineBounds.y;
}
}
}
}
}
}
nsRect transformedBounds = nsLayoutUtils::TransformFrameRectToAncestor(frame,
frameBounds, aContainerFrame);
if (aHaveRect) {
// We can't use nsRect::UnionRect since it drops empty rects on
// the floor, and we need to include them. (Thus we need
// aHaveRect to know when to drop the initial value on the floor.)
aRect.UnionRectEdges(aRect, transformedBounds);
} else {
aHaveRect = true;
aRect = transformedBounds;
}
}
static bool
ComputeNeedToScroll(nsIPresShell::WhenToScroll aWhenToScroll,
nscoord aLineSize,
nscoord aRectMin,
nscoord aRectMax,
nscoord aViewMin,
nscoord aViewMax) {
// See how the rect should be positioned vertically
if (nsIPresShell::SCROLL_ALWAYS == aWhenToScroll) {
// The caller wants the frame as visible as possible
return true;
} else if (nsIPresShell::SCROLL_IF_NOT_VISIBLE == aWhenToScroll) {
// Scroll only if no part of the frame is visible in this view
return aRectMax - aLineSize <= aViewMin ||
aRectMin + aLineSize >= aViewMax;
} else if (nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE == aWhenToScroll) {
// Scroll only if part of the frame is hidden and more can fit in view
return !(aRectMin >= aViewMin && aRectMax <= aViewMax) &&
std::min(aViewMax, aRectMax) - std::max(aRectMin, aViewMin) < aViewMax - aViewMin;
}
return false;
}
static nscoord
ComputeWhereToScroll(int16_t aWhereToScroll,
nscoord aOriginalCoord,
nscoord aRectMin,
nscoord aRectMax,
nscoord aViewMin,
nscoord aViewMax,
nscoord* aRangeMin,
nscoord* aRangeMax) {
nscoord resultCoord = aOriginalCoord;
// Allow the scroll operation to land anywhere that
// makes the whole rectangle visible.
if (nsIPresShell::SCROLL_MINIMUM == aWhereToScroll) {
if (aRectMin < aViewMin) {
// Scroll up so the frame's top edge is visible
resultCoord = aRectMin;
} else if (aRectMax > aViewMax) {
// Scroll down so the frame's bottom edge is visible. Make sure the
// frame's top edge is still visible
resultCoord = aOriginalCoord + aRectMax - aViewMax;
if (resultCoord > aRectMin) {
resultCoord = aRectMin;
}
}
} else {
nscoord frameAlignCoord =
NSToCoordRound(aRectMin + (aRectMax - aRectMin) * (aWhereToScroll / 100.0f));
resultCoord = NSToCoordRound(frameAlignCoord - (aViewMax - aViewMin) * (
aWhereToScroll / 100.0f));
}
nscoord scrollPortLength = aViewMax - aViewMin;
// Force the scroll range to extend to include resultCoord.
*aRangeMin = std::min(resultCoord, aRectMax - scrollPortLength);
*aRangeMax = std::max(resultCoord, aRectMin);
return resultCoord;
}
/**
* This function takes a scrollable frame, a rect in the coordinate system
* of the scrolled frame, and a desired percentage-based scroll
* position and attempts to scroll the rect to that position in the
* scrollport.
*
* This needs to work even if aRect has a width or height of zero.
*/
static void ScrollToShowRect(nsIFrame* aFrame,
nsIScrollableFrame* aFrameAsScrollable,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
nsPoint scrollPt = aFrameAsScrollable->GetScrollPosition();
nsRect visibleRect(scrollPt,
aFrameAsScrollable->GetScrollPositionClampingScrollPortSize());
// If this is the root scroll frame, make sure to take into account the
// content document fixed position margins. When set, these indicate that
// chrome is obscuring the viewport.
nsRect targetRect(aRect);
nsIPresShell *presShell = aFrame->PresContext()->PresShell();
if (aFrameAsScrollable == presShell->GetRootScrollFrameAsScrollable()) {
targetRect.Inflate(presShell->GetContentDocumentFixedPositionMargins());
}
nsSize lineSize;
// Don't call GetLineScrollAmount unless we actually need it. Not only
// does this save time, but it's not safe to call GetLineScrollAmount
// during reflow (because it depends on font size inflation and doesn't
// use the in-reflow-safe font-size inflation path). If we did call it,
// it would assert and possible give the wrong result.
if (aVertical.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE ||
aHorizontal.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE) {
lineSize = aFrameAsScrollable->GetLineScrollAmount();
}
ScrollbarStyles ss = aFrameAsScrollable->GetScrollbarStyles();
nsRect allowedRange(scrollPt, nsSize(0, 0));
bool needToScroll = false;
uint32_t directions = aFrameAsScrollable->GetPerceivedScrollingDirections();
if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN) &&
(!aVertical.mOnlyIfPerceivedScrollableDirection ||
(directions & nsIScrollableFrame::VERTICAL))) {
if (ComputeNeedToScroll(aVertical.mWhenToScroll,
lineSize.height,
targetRect.y,
targetRect.YMost(),
visibleRect.y,
visibleRect.YMost())) {
nscoord maxHeight;
scrollPt.y = ComputeWhereToScroll(aVertical.mWhereToScroll,
scrollPt.y,
targetRect.y,
targetRect.YMost(),
visibleRect.y,
visibleRect.YMost(),
&allowedRange.y, &maxHeight);
allowedRange.height = maxHeight - allowedRange.y;
needToScroll = true;
}
}
if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) &&
(!aHorizontal.mOnlyIfPerceivedScrollableDirection ||
(directions & nsIScrollableFrame::HORIZONTAL))) {
if (ComputeNeedToScroll(aHorizontal.mWhenToScroll,
lineSize.width,
targetRect.x,
targetRect.XMost(),
visibleRect.x,
visibleRect.XMost())) {
nscoord maxWidth;
scrollPt.x = ComputeWhereToScroll(aHorizontal.mWhereToScroll,
scrollPt.x,
targetRect.x,
targetRect.XMost(),
visibleRect.x,
visibleRect.XMost(),
&allowedRange.x, &maxWidth);
allowedRange.width = maxWidth - allowedRange.x;
needToScroll = true;
}
}
// If we don't need to scroll, then don't try since it might cancel
// a current smooth scroll operation.
if (needToScroll) {
nsIScrollableFrame::ScrollMode scrollMode = nsIScrollableFrame::INSTANT;
bool autoBehaviorIsSmooth = (aFrameAsScrollable->GetScrollbarStyles().mScrollBehavior
== NS_STYLE_SCROLL_BEHAVIOR_SMOOTH);
bool smoothScroll = (aFlags & nsIPresShell::SCROLL_SMOOTH) ||
((aFlags & nsIPresShell::SCROLL_SMOOTH_AUTO) && autoBehaviorIsSmooth);
if (gfxPrefs::ScrollBehaviorEnabled() && smoothScroll) {
scrollMode = nsIScrollableFrame::SMOOTH_MSD;
}
aFrameAsScrollable->ScrollTo(scrollPt, scrollMode, &allowedRange);
}
}
nsresult
PresShell::ScrollContentIntoView(nsIContent* aContent,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
NS_ENSURE_TRUE(aContent, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDocument> composedDoc = aContent->GetComposedDoc();
NS_ENSURE_STATE(composedDoc);
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
}
mContentToScrollTo = aContent;
ScrollIntoViewData* data = new ScrollIntoViewData();
data->mContentScrollVAxis = aVertical;
data->mContentScrollHAxis = aHorizontal;
data->mContentToScrollToFlags = aFlags;
if (NS_FAILED(mContentToScrollTo->SetProperty(nsGkAtoms::scrolling, data,
nsINode::DeleteProperty<PresShell::ScrollIntoViewData>))) {
mContentToScrollTo = nullptr;
}
// Flush layout and attempt to scroll in the process.
composedDoc->SetNeedLayoutFlush();
composedDoc->FlushPendingNotifications(Flush_InterruptibleLayout);
// If mContentToScrollTo is non-null, that means we interrupted the reflow
// (or suppressed it altogether because we're suppressing interruptible
// flushes right now) and won't necessarily get the position correct, but do
// a best-effort scroll here. The other option would be to do this inside
// FlushPendingNotifications, but I'm not sure the repeated scrolling that
// could trigger if reflows keep getting interrupted would be more desirable
// than a single best-effort scroll followed by one final scroll on the first
// completed reflow.
if (mContentToScrollTo) {
DoScrollContentIntoView();
}
return NS_OK;
}
void
PresShell::DoScrollContentIntoView()
{
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIFrame* frame = mContentToScrollTo->GetPrimaryFrame();
if (!frame) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
return;
}
if (frame->GetStateBits() & NS_FRAME_FIRST_REFLOW) {
// The reflow flush before this scroll got interrupted, and this frame's
// coords and size are all zero, and it has no content showing anyway.
// Don't bother scrolling to it. We'll try again when we finish up layout.
return;
}
// Make sure we skip 'frame' ... if it's scrollable, we should use its
// scrollable ancestor as the container.
nsIFrame* container =
nsLayoutUtils::GetClosestFrameOfType(frame->GetParent(), nsGkAtoms::scrollFrame);
if (!container) {
// nothing can be scrolled
return;
}
ScrollIntoViewData* data = static_cast<ScrollIntoViewData*>(
mContentToScrollTo->GetProperty(nsGkAtoms::scrolling));
if (MOZ_UNLIKELY(!data)) {
mContentToScrollTo = nullptr;
return;
}
// This is a two-step process.
// Step 1: Find the bounds of the rect we want to scroll into view. For
// example, for an inline frame we may want to scroll in the whole
// line, or we may want to scroll multiple lines into view.
// Step 2: Walk container frame and its ancestors and scroll them
// appropriately.
// frameBounds is relative to container. We're assuming
// that scrollframes don't split so every continuation of frame will
// be a descendant of container. (Things would still mostly work
// even if that assumption was false.)
nsRect frameBounds;
bool haveRect = false;
bool useWholeLineHeightForInlines =
data->mContentScrollVAxis.mWhenToScroll != nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE;
// Reuse the same line iterator across calls to AccumulateFrameBounds. We set
// it every time we detect a new block (stored in prevBlock).
nsIFrame* prevBlock = nullptr;
nsAutoLineIterator lines;
// The last line we found a continuation on in |lines|. We assume that later
// continuations cannot come on earlier lines.
int32_t curLine = 0;
do {
AccumulateFrameBounds(container, frame, useWholeLineHeightForInlines,
frameBounds, haveRect, prevBlock, lines, curLine);
} while ((frame = frame->GetNextContinuation()));
ScrollFrameRectIntoView(container, frameBounds, data->mContentScrollVAxis,
data->mContentScrollHAxis,
data->mContentToScrollToFlags);
}
bool
PresShell::ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
bool didScroll = false;
// This function needs to work even if rect has a width or height of 0.
nsRect rect = aRect;
nsIFrame* container = aFrame;
// Walk up the frame hierarchy scrolling the rect into view and
// keeping rect relative to container
do {
nsIScrollableFrame* sf = do_QueryFrame(container);
if (sf) {
nsPoint oldPosition = sf->GetScrollPosition();
nsRect targetRect = rect;
if (container->StyleDisplay()->mOverflowClipBox ==
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX) {
nsMargin padding = container->GetUsedPadding();
targetRect.Inflate(padding);
}
ScrollToShowRect(container, sf, targetRect - sf->GetScrolledFrame()->GetPosition(),
aVertical, aHorizontal, aFlags);
nsPoint newPosition = sf->GetScrollPosition();
// If the scroll position increased, that means our content moved up,
// so our rect's offset should decrease
rect += oldPosition - newPosition;
if (oldPosition != newPosition) {
didScroll = true;
}
// only scroll one container when this flag is set
if (aFlags & nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY) {
break;
}
}
nsIFrame* parent;
if (container->IsTransformed()) {
container->GetTransformMatrix(nullptr, &parent);
rect = nsLayoutUtils::TransformFrameRectToAncestor(container, rect, parent);
} else {
rect += container->GetPosition();
parent = container->GetParent();
}
if (!parent && !(aFlags & nsIPresShell::SCROLL_NO_PARENT_FRAMES)) {
nsPoint extraOffset(0,0);
parent = nsLayoutUtils::GetCrossDocParentFrame(container, &extraOffset);
if (parent) {
int32_t APD = container->PresContext()->AppUnitsPerDevPixel();
int32_t parentAPD = parent->PresContext()->AppUnitsPerDevPixel();
rect = rect.ConvertAppUnitsRoundOut(APD, parentAPD);
rect += extraOffset;
}
}
container = parent;
} while (container);
return didScroll;
}
nsRectVisibility
PresShell::GetRectVisibility(nsIFrame* aFrame,
const nsRect &aRect,
nscoord aMinTwips) const
{
NS_ASSERTION(aFrame->PresContext() == GetPresContext(),
"prescontext mismatch?");
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(rootFrame,
"How can someone have a frame for this presshell when there's no root?");
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
nsRect scrollPortRect;
if (sf) {
scrollPortRect = sf->GetScrollPortRect();
nsIFrame* f = do_QueryFrame(sf);
scrollPortRect += f->GetOffsetTo(rootFrame);
} else {
scrollPortRect = nsRect(nsPoint(0,0), rootFrame->GetSize());
}
nsRect r = aRect + aFrame->GetOffsetTo(rootFrame);
// If aRect is entirely visible then we don't need to ensure that
// at least aMinTwips of it is visible
if (scrollPortRect.Contains(r))
return nsRectVisibility_kVisible;
nsRect insetRect = scrollPortRect;
insetRect.Deflate(aMinTwips, aMinTwips);
if (r.YMost() <= insetRect.y)
return nsRectVisibility_kAboveViewport;
if (r.y >= insetRect.YMost())
return nsRectVisibility_kBelowViewport;
if (r.XMost() <= insetRect.x)
return nsRectVisibility_kLeftOfViewport;
if (r.x >= insetRect.XMost())
return nsRectVisibility_kRightOfViewport;
return nsRectVisibility_kVisible;
}
class PaintTimerCallBack MOZ_FINAL : public nsITimerCallback
{
public:
explicit PaintTimerCallBack(PresShell* aShell) : mShell(aShell) {}
NS_DECL_ISUPPORTS
NS_IMETHODIMP Notify(nsITimer* aTimer) MOZ_FINAL
{
mShell->SetNextPaintCompressed();
mShell->AddInvalidateHiddenPresShellObserver(mShell->GetPresContext()->RefreshDriver());
mShell->ScheduleViewManagerFlush();
return NS_OK;
}
private:
~PaintTimerCallBack() {}
PresShell* mShell;
};
NS_IMPL_ISUPPORTS(PaintTimerCallBack, nsITimerCallback)
void
PresShell::ScheduleViewManagerFlush(PaintType aType)
{
if (aType == PAINT_DELAYED_COMPRESS) {
// Delay paint for 1 second.
static const uint32_t kPaintDelayPeriod = 1000;
if (!mDelayedPaintTimer) {
mDelayedPaintTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
nsRefPtr<PaintTimerCallBack> cb = new PaintTimerCallBack(this);
mDelayedPaintTimer->InitWithCallback(cb, kPaintDelayPeriod, nsITimer::TYPE_ONE_SHOT);
}
return;
}
nsPresContext* presContext = GetPresContext();
if (presContext) {
presContext->RefreshDriver()->ScheduleViewManagerFlush();
}
if (mDocument) {
mDocument->SetNeedLayoutFlush();
}
}
void
PresShell::DispatchSynthMouseMove(WidgetGUIEvent* aEvent,
bool aFlushOnHoverChange)
{
RestyleManager* restyleManager = mPresContext->RestyleManager();
uint32_t hoverGenerationBefore = restyleManager->GetHoverGeneration();
nsEventStatus status;
nsView* targetView = nsView::GetViewFor(aEvent->widget);
if (!targetView)
return;
targetView->GetViewManager()->DispatchEvent(aEvent, targetView, &status);
if (MOZ_UNLIKELY(mIsDestroying)) {
return;
}
if (aFlushOnHoverChange &&
hoverGenerationBefore != restyleManager->GetHoverGeneration()) {
// Flush so that the resulting reflow happens now so that our caller
// can suppress any synthesized mouse moves caused by that reflow.
FlushPendingNotifications(Flush_Layout);
}
}
void
PresShell::ClearMouseCaptureOnView(nsView* aView)
{
if (gCaptureInfo.mContent) {
if (aView) {
// if a view was specified, ensure that the captured content is within
// this view.
nsIFrame* frame = gCaptureInfo.mContent->GetPrimaryFrame();
if (frame) {
nsView* view = frame->GetClosestView();
// if there is no view, capturing won't be handled any more, so
// just release the capture.
if (view) {
do {
if (view == aView) {
NS_RELEASE(gCaptureInfo.mContent);
// the view containing the captured content likely disappeared so
// disable capture for now.
gCaptureInfo.mAllowed = false;
break;
}
view = view->GetParent();
} while (view);
// return if the view wasn't found
return;
}
}
}
NS_RELEASE(gCaptureInfo.mContent);
}
// disable mouse capture until the next mousedown as a dialog has opened
// or a drag has started. Otherwise, someone could start capture during
// the modal dialog or drag.
gCaptureInfo.mAllowed = false;
}
void
nsIPresShell::ClearMouseCapture(nsIFrame* aFrame)
{
if (!gCaptureInfo.mContent) {
gCaptureInfo.mAllowed = false;
return;
}
// null frame argument means clear the capture
if (!aFrame) {
NS_RELEASE(gCaptureInfo.mContent);
gCaptureInfo.mAllowed = false;
return;
}
nsIFrame* capturingFrame = gCaptureInfo.mContent->GetPrimaryFrame();
if (!capturingFrame) {
NS_RELEASE(gCaptureInfo.mContent);
gCaptureInfo.mAllowed = false;
return;
}
if (nsLayoutUtils::IsAncestorFrameCrossDoc(aFrame, capturingFrame)) {
NS_RELEASE(gCaptureInfo.mContent);
gCaptureInfo.mAllowed = false;
}
}
nsresult
PresShell::CaptureHistoryState(nsILayoutHistoryState** aState)
{
NS_PRECONDITION(nullptr != aState, "null state pointer");
// We actually have to mess with the docshell here, since we want to
// store the state back in it.
// XXXbz this isn't really right, since this is being called in the
// content viewer's Hide() method... by that point the docshell's
// state could be wrong. We should sort out a better ownership
// model for the layout history state.
nsCOMPtr<nsIDocShell> docShell(mPresContext->GetDocShell());
if (!docShell)
return NS_ERROR_FAILURE;
nsCOMPtr<nsILayoutHistoryState> historyState;
docShell->GetLayoutHistoryState(getter_AddRefs(historyState));
if (!historyState) {
// Create the document state object
historyState = NS_NewLayoutHistoryState();
docShell->SetLayoutHistoryState(historyState);
}
*aState = historyState;
NS_IF_ADDREF(*aState);
// Capture frame state for the entire frame hierarchy
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) return NS_OK;
mFrameConstructor->CaptureFrameState(rootFrame, historyState);
return NS_OK;
}
void
PresShell::UnsuppressAndInvalidate()
{
// Note: We ignore the EnsureVisible check for resource documents, because
// they won't have a docshell, so they'll always fail EnsureVisible.
if ((!mDocument->IsResourceDoc() && !mPresContext->EnsureVisible()) ||
mHaveShutDown) {
// No point; we're about to be torn down anyway.
return;
}
if (!mDocument->IsResourceDoc()) {
// Notify observers that a new page is about to be drawn. Execute this
// as soon as it is safe to run JS, which is guaranteed to be before we
// go back to the event loop and actually draw the page.
nsContentUtils::AddScriptRunner(new nsBeforeFirstPaintDispatcher(mDocument));
}
mPaintingSuppressed = false;
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
// let's assume that outline on a root frame is not supported
rootFrame->InvalidateFrame();
if (mTouchCaret) {
mTouchCaret->SyncVisibilityWithCaret();
}
}
// now that painting is unsuppressed, focus may be set on the document
nsPIDOMWindow *win = mDocument->GetWindow();
if (win)
win->SetReadyForFocus();
if (!mHaveShutDown) {
SynthesizeMouseMove(false);
ScheduleImageVisibilityUpdate();
}
}
void
PresShell::UnsuppressPainting()
{
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
if (mIsDocumentGone || !mPaintingSuppressed)
return;
// If we have reflows pending, just wait until we process
// the reflows and get all the frames where we want them
// before actually unlocking the painting. Otherwise
// go ahead and unlock now.
if (!mDirtyRoots.IsEmpty())
mShouldUnsuppressPainting = true;
else
UnsuppressAndInvalidate();
}
// Post a request to handle an arbitrary callback after reflow has finished.
nsresult
PresShell::PostReflowCallback(nsIReflowCallback* aCallback)
{
void* result = AllocateMisc(sizeof(nsCallbackEventRequest));
nsCallbackEventRequest* request = (nsCallbackEventRequest*)result;
request->callback = aCallback;
request->next = nullptr;
if (mLastCallbackEventRequest) {
mLastCallbackEventRequest = mLastCallbackEventRequest->next = request;
} else {
mFirstCallbackEventRequest = request;
mLastCallbackEventRequest = request;
}
return NS_OK;
}
void
PresShell::CancelReflowCallback(nsIReflowCallback* aCallback)
{
nsCallbackEventRequest* before = nullptr;
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
while(node)
{
nsIReflowCallback* callback = node->callback;
if (callback == aCallback)
{
nsCallbackEventRequest* toFree = node;
if (node == mFirstCallbackEventRequest) {
node = node->next;
mFirstCallbackEventRequest = node;
NS_ASSERTION(before == nullptr, "impossible");
} else {
node = node->next;
before->next = node;
}
if (toFree == mLastCallbackEventRequest) {
mLastCallbackEventRequest = before;
}
FreeMisc(sizeof(nsCallbackEventRequest), toFree);
} else {
before = node;
node = node->next;
}
}
}
void
PresShell::CancelPostedReflowCallbacks()
{
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeMisc(sizeof(nsCallbackEventRequest), node);
if (callback) {
callback->ReflowCallbackCanceled();
}
}
}
void
PresShell::HandlePostedReflowCallbacks(bool aInterruptible)
{
bool shouldFlush = false;
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeMisc(sizeof(nsCallbackEventRequest), node);
if (callback) {
if (callback->ReflowFinished()) {
shouldFlush = true;
}
}
}
mozFlushType flushType =
aInterruptible ? Flush_InterruptibleLayout : Flush_Layout;
if (shouldFlush && !mIsDestroying) {
FlushPendingNotifications(flushType);
}
}
bool
PresShell::IsSafeToFlush() const
{
// Not safe if we are reflowing or in the middle of frame construction
bool isSafeToFlush = !mIsReflowing &&
!mChangeNestCount;
if (isSafeToFlush) {
// Not safe if we are painting
nsViewManager* viewManager = GetViewManager();
if (viewManager) {
bool isPainting = false;
viewManager->IsPainting(isPainting);
if (isPainting) {
isSafeToFlush = false;
}
}
}
return isSafeToFlush;
}
void
PresShell::FlushPendingNotifications(mozFlushType aType)
{
// by default, flush animations if aType >= Flush_Style
mozilla::ChangesToFlush flush(aType, aType >= Flush_Style);
FlushPendingNotifications(flush);
}
void
PresShell::FlushPendingNotifications(mozilla::ChangesToFlush aFlush)
{
if (mIsZombie) {
return;
}
/**
* VERY IMPORTANT: If you add some sort of new flushing to this
* method, make sure to add the relevant SetNeedLayoutFlush or
* SetNeedStyleFlush calls on the document.
*/
mozFlushType flushType = aFlush.mFlushType;
#ifdef MOZ_ENABLE_PROFILER_SPS
static const char flushTypeNames[][20] = {
"Content",
"ContentAndNotify",
"Style",
"InterruptibleLayout",
"Layout",
"Display"
};
// Make sure that we don't miss things added to mozFlushType!
MOZ_ASSERT(static_cast<uint32_t>(flushType) <= ArrayLength(flushTypeNames));
PROFILER_LABEL_PRINTF("PresShell", "Flush",
js::ProfileEntry::Category::GRAPHICS, "(Flush_%s)", flushTypeNames[flushType - 1]);
#endif
#ifdef ACCESSIBILITY
#ifdef DEBUG
nsAccessibilityService* accService = GetAccService();
if (accService) {
NS_ASSERTION(!accService->IsProcessingRefreshDriverNotification(),
"Flush during accessible tree update!");
}
#endif
#endif
NS_ASSERTION(flushType >= Flush_Frames, "Why did we get called?");
bool isSafeToFlush = IsSafeToFlush();
// If layout could possibly trigger scripts, then it's only safe to flush if
// it's safe to run script.
bool hasHadScriptObject;
if (mDocument->GetScriptHandlingObject(hasHadScriptObject) ||
hasHadScriptObject) {
isSafeToFlush = isSafeToFlush && nsContentUtils::IsSafeToRunScript();
}
NS_ASSERTION(!isSafeToFlush || mViewManager, "Must have view manager");
// Make sure the view manager stays alive.
nsRefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
bool didStyleFlush = false;
bool didLayoutFlush = false;
if (isSafeToFlush && mViewManager) {
// Processing pending notifications can kill us, and some callers only
// hold weak refs when calling FlushPendingNotifications(). :(
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
if (mResizeEvent.IsPending()) {
FireResizeEvent();
if (mIsDestroying) {
return;
}
}
// We need to make sure external resource documents are flushed too (for
// example, svg filters that reference a filter in an external document
// need the frames in the external document to be constructed for the
// filter to work). We only need external resources to be flushed when the
// main document is flushing >= Flush_Frames, so we flush external
// resources here instead of nsDocument::FlushPendingNotifications.
mDocument->FlushExternalResources(flushType);
// Force flushing of any pending content notifications that might have
// queued up while our event was pending. That will ensure that we don't
// construct frames for content right now that's still waiting to be
// notified on,
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
// Process pending restyles, since any flush of the presshell wants
// up-to-date style data.
if (!mIsDestroying) {
mViewManager->FlushDelayedResize(false);
mPresContext->FlushPendingMediaFeatureValuesChanged();
// Flush any pending update of the user font set, since that could
// cause style changes (for updating ex/ch units, and to cause a
// reflow).
mPresContext->FlushUserFontSet();
mPresContext->FlushCounterStyles();
// Flush any requested SMIL samples.
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->FlushResampleRequests();
}
if (aFlush.mFlushAnimations &&
!mPresContext->StyleUpdateForAllAnimationsIsUpToDate()) {
if (mPresContext->AnimationManager()) {
mPresContext->AnimationManager()->
FlushAnimations(CommonAnimationManager::Cannot_Throttle);
}
if (mPresContext->TransitionManager()) {
mPresContext->TransitionManager()->
FlushTransitions(CommonAnimationManager::Cannot_Throttle);
}
mPresContext->TickLastStyleUpdateForAllAnimations();
}
// The FlushResampleRequests() above flushed style changes.
if (!mIsDestroying) {
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
}
// Dispatch any 'animationstart' events those (or earlier) restyles
// queued up.
if (!mIsDestroying) {
mPresContext->AnimationManager()->DispatchEvents();
}
// Process whatever XBL constructors those restyles queued up. This
// ensures that onload doesn't fire too early and that we won't do extra
// reflows after those constructors run.
if (!mIsDestroying) {
mDocument->BindingManager()->ProcessAttachedQueue();
}
// Now those constructors or events might have posted restyle
// events. At the same time, we still need up-to-date style data.
// In particular, reflow depends on style being completely up to
// date. If it's not, then style context reparenting, which can
// happen during reflow, might suddenly pick up the new rules and
// we'll end up with frames whose style doesn't match the frame
// type.
if (!mIsDestroying) {
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
didStyleFlush = true;
// There might be more pending constructors now, but we're not going to
// worry about them. They can't be triggered during reflow, so we should
// be good.
if (flushType >= (mSuppressInterruptibleReflows ? Flush_Layout : Flush_InterruptibleLayout) &&
!mIsDestroying) {
didLayoutFlush = true;
mFrameConstructor->RecalcQuotesAndCounters();
mViewManager->FlushDelayedResize(true);
if (ProcessReflowCommands(flushType < Flush_Layout) && mContentToScrollTo) {
// We didn't get interrupted. Go ahead and scroll to our content
DoScrollContentIntoView();
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
}
}
if (flushType >= Flush_Layout) {
if (!mIsDestroying) {
mViewManager->UpdateWidgetGeometry();
}
}
}
if (!didStyleFlush && flushType >= Flush_Style && !mIsDestroying) {
mDocument->SetNeedStyleFlush();
}
if (!didLayoutFlush && !mIsDestroying &&
(flushType >=
(mSuppressInterruptibleReflows ? Flush_Layout : Flush_InterruptibleLayout))) {
// We suppressed this flush due to mSuppressInterruptibleReflows or
// !isSafeToFlush, but the document thinks it doesn't
// need to flush anymore. Let it know what's really going on.
mDocument->SetNeedLayoutFlush();
}
}
void
PresShell::CharacterDataChanged(nsIDocument *aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected CharacterDataChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
nsIContent *container = aContent->GetParent();
uint32_t selectorFlags =
container ? (container->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
if (selectorFlags != 0 && !aContent->IsRootOfAnonymousSubtree()) {
Element* element = container->AsElement();
if (aInfo->mAppend && !aContent->GetNextSibling())
mPresContext->RestyleManager()->RestyleForAppend(element, aContent);
else
mPresContext->RestyleManager()->RestyleForInsertOrChange(element, aContent);
}
mFrameConstructor->CharacterDataChanged(aContent, aInfo);
VERIFY_STYLE_TREE;
}
void
PresShell::ContentStateChanged(nsIDocument* aDocument,
nsIContent* aContent,
EventStates aStateMask)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentStateChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->ContentStateChanged(aContent, aStateMask);
VERIFY_STYLE_TREE;
}
}
void
PresShell::DocumentStatesChanged(nsIDocument* aDocument,
EventStates aStateMask)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected DocumentStatesChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (mDidInitialize &&
mStyleSet->HasDocumentStateDependentStyle(mPresContext,
mDocument->GetRootElement(),
aStateMask)) {
mPresContext->RestyleManager()->PostRestyleEvent(mDocument->GetRootElement(),
eRestyle_Subtree,
NS_STYLE_HINT_NONE);
VERIFY_STYLE_TREE;
}
if (aStateMask.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
nsIFrame* root = mFrameConstructor->GetRootFrame();
if (root) {
root->SchedulePaint();
}
}
}
void
PresShell::AttributeWillChange(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected AttributeWillChange");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeWillChange(aElement, aNameSpaceID,
aAttribute, aModType);
VERIFY_STYLE_TREE;
}
}
void
PresShell::AttributeChanged(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected AttributeChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeChanged(aElement, aNameSpaceID,
aAttribute, aModType);
VERIFY_STYLE_TREE;
}
}
void
PresShell::ContentAppended(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentAppended");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
NS_PRECONDITION(aContainer, "must have container");
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
if (aContainer->IsElement()) {
// Ensure the container is an element before trying to restyle
// because it can be the case that the container is a ShadowRoot
// which is a document fragment.
mPresContext->RestyleManager()->
RestyleForAppend(aContainer->AsElement(), aFirstNewContent);
}
mFrameConstructor->ContentAppended(aContainer, aFirstNewContent, true);
if (static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument) &&
aFirstNewContent->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
void
PresShell::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentInserted");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
if (aContainer && aContainer->IsElement()) {
// Ensure the container is an element before trying to restyle
// because it can be the case that the container is a ShadowRoot
// which is a document fragment.
mPresContext->RestyleManager()->
RestyleForInsertOrChange(aContainer->AsElement(), aChild);
}
mFrameConstructor->ContentInserted(aContainer, aChild, nullptr, true);
if (((!aContainer && aDocument) ||
(static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument))) &&
aChild->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
PLDHashOperator
ReleasePointerCaptureFromRemovedContent(const uint32_t& aKey,
nsIPresShell::PointerCaptureInfo* aData,
void* aChildLink)
{
if (aChildLink && aData && aData->mOverrideContent) {
if (nsIContent* content = static_cast<nsIContent*>(aChildLink)) {
if (nsContentUtils::ContentIsDescendantOf(aData->mOverrideContent, content)) {
nsIPresShell::ReleasePointerCapturingContent(aKey, aData->mOverrideContent);
}
}
}
return PLDHashOperator::PL_DHASH_NEXT;
}
void
PresShell::ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentRemoved");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// Notify the ESM that the content has been removed, so that
// it can clean up any state related to the content.
// XXX_jwir3: There is no null check for aDocument necessary, since, even
// though by nsIMutationObserver, aDocument could be null, the
// precondition check that mDocument == aDocument ensures that
// aDocument will not be null (since mDocument can't be null unless
// we're still intializing).
mPresContext->EventStateManager()->ContentRemoved(aDocument, aChild);
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
nsIContent* oldNextSibling;
if (aContainer) {
oldNextSibling = aContainer->GetChildAt(aIndexInContainer);
} else {
oldNextSibling = nullptr;
}
if (aContainer && aContainer->IsElement()) {
mPresContext->RestyleManager()->
RestyleForRemove(aContainer->AsElement(), aChild, oldNextSibling);
}
// We should check that aChild does not contain pointer capturing elements.
// If it does we should release the pointer capture for the elements.
gPointerCaptureList->EnumerateRead(ReleasePointerCaptureFromRemovedContent, aChild);
bool didReconstruct;
mFrameConstructor->ContentRemoved(aContainer, aChild, oldNextSibling,
nsCSSFrameConstructor::REMOVE_CONTENT,
&didReconstruct);
if (((aContainer &&
static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument)) ||
aDocument) && aChild->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
void
PresShell::NotifyCounterStylesAreDirty()
{
nsAutoCauseReflowNotifier reflowNotifier(this);
mFrameConstructor->BeginUpdate();
mFrameConstructor->NotifyCounterStylesAreDirty();
mFrameConstructor->EndUpdate();
}
nsresult
PresShell::ReconstructFrames(void)
{
NS_PRECONDITION(!mFrameConstructor->GetRootFrame() || mDidInitialize,
"Must not have root frame before initial reflow");
if (!mDidInitialize) {
// Nothing to do here
return NS_OK;
}
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoCauseReflowNotifier crNotifier(this);
mFrameConstructor->BeginUpdate();
nsresult rv = mFrameConstructor->ReconstructDocElementHierarchy();
VERIFY_STYLE_TREE;
mFrameConstructor->EndUpdate();
return rv;
}
void
nsIPresShell::ReconstructStyleDataInternal()
{
nsAutoTArray<nsRefPtr<mozilla::dom::Element>,1> scopeRoots;
mChangedScopeStyleRoots.SwapElements(scopeRoots);
if (mStylesHaveChanged) {
// If we need to restyle everything, no need to restyle individual
// scoped style roots.
scopeRoots.Clear();
}
mStylesHaveChanged = false;
if (mIsDestroying) {
// We don't want to mess with restyles at this point
return;
}
if (mPresContext) {
mPresContext->RebuildUserFontSet();
mPresContext->RebuildCounterStyles();
}
Element* root = mDocument->GetRootElement();
if (!mDidInitialize) {
// Nothing to do here, since we have no frames yet
return;
}
if (!root) {
// No content to restyle
return;
}
RestyleManager* restyleManager = mPresContext->RestyleManager();
if (scopeRoots.IsEmpty()) {
// If scopeRoots is empty, we know that mStylesHaveChanged was true at
// the beginning of this function, and that we need to restyle the whole
// document.
restyleManager->PostRestyleEvent(root, eRestyle_Subtree,
NS_STYLE_HINT_NONE);
} else {
for (uint32_t i = 0; i < scopeRoots.Length(); i++) {
Element* scopeRoot = scopeRoots[i];
restyleManager->PostRestyleEvent(scopeRoot, eRestyle_Subtree,
NS_STYLE_HINT_NONE);
}
}
}
void
nsIPresShell::ReconstructStyleDataExternal()
{
ReconstructStyleDataInternal();
}
void
PresShell::RecordStyleSheetChange(nsIStyleSheet* aStyleSheet)
{
// too bad we can't check that the update is UPDATE_STYLE
NS_ASSERTION(mUpdateCount != 0, "must be in an update");
if (mStylesHaveChanged)
return;
nsRefPtr<CSSStyleSheet> cssStyleSheet = do_QueryObject(aStyleSheet);
if (cssStyleSheet) {
Element* scopeElement = cssStyleSheet->GetScopeElement();
if (scopeElement) {
mChangedScopeStyleRoots.AppendElement(scopeElement);
return;
}
}
mStylesHaveChanged = true;
}
void
PresShell::StyleSheetAdded(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
bool aDocumentSheet)
{
// We only care when enabled sheets are added
NS_PRECONDITION(aStyleSheet, "Must have a style sheet!");
if (aStyleSheet->IsApplicable() && aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleSheetRemoved(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
bool aDocumentSheet)
{
// We only care when enabled sheets are removed
NS_PRECONDITION(aStyleSheet, "Must have a style sheet!");
if (aStyleSheet->IsApplicable() && aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleSheetApplicableStateChanged(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
bool aApplicable)
{
if (aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleRuleChanged(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aOldStyleRule,
nsIStyleRule* aNewStyleRule)
{
RecordStyleSheetChange(aStyleSheet);
}
void
PresShell::StyleRuleAdded(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule)
{
RecordStyleSheetChange(aStyleSheet);
}
void
PresShell::StyleRuleRemoved(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule)
{
RecordStyleSheetChange(aStyleSheet);
}
nsIFrame*
PresShell::GetRealPrimaryFrameFor(nsIContent* aContent) const
{
if (aContent->GetComposedDoc() != GetDocument()) {
return nullptr;
}
nsIFrame *primaryFrame = aContent->GetPrimaryFrame();
if (!primaryFrame)
return nullptr;
return nsPlaceholderFrame::GetRealFrameFor(primaryFrame);
}
nsIFrame*
PresShell::GetPlaceholderFrameFor(nsIFrame* aFrame) const
{
return mFrameConstructor->GetPlaceholderFrameFor(aFrame);
}
nsresult
PresShell::RenderDocument(const nsRect& aRect, uint32_t aFlags,
nscolor aBackgroundColor,
gfxContext* aThebesContext)
{
NS_ENSURE_TRUE(!(aFlags & RENDER_IS_UNTRUSTED), NS_ERROR_NOT_IMPLEMENTED);
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying)
return NS_OK;
}
nsAutoScriptBlocker blockScripts;
// Set up the rectangle as the path in aThebesContext
gfxRect r(0, 0,
nsPresContext::AppUnitsToFloatCSSPixels(aRect.width),
nsPresContext::AppUnitsToFloatCSSPixels(aRect.height));
aThebesContext->NewPath();
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
aThebesContext->Rectangle(r, true);
#else
aThebesContext->Rectangle(r);
#endif
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
// Nothing to paint, just fill the rect
aThebesContext->SetColor(gfxRGBA(aBackgroundColor));
aThebesContext->Fill();
return NS_OK;
}
gfxContextAutoSaveRestore save(aThebesContext);
gfxContext::GraphicsOperator oldOperator = aThebesContext->CurrentOperator();
if (oldOperator == gfxContext::OPERATOR_OVER) {
// Clip to the destination rectangle before we push the group,
// to limit the size of the temporary surface
aThebesContext->Clip();
}
// we want the window to be composited as a single image using
// whatever operator was set; set OPERATOR_OVER here, which is
// either already the case, or overrides the operator in a group.
// the original operator will be present when we PopGroup.
// we can avoid using a temporary surface if we're using OPERATOR_OVER
bool needsGroup = oldOperator != gfxContext::OPERATOR_OVER;
if (needsGroup) {
aThebesContext->PushGroup(NS_GET_A(aBackgroundColor) == 0xff ?
gfxContentType::COLOR :
gfxContentType::COLOR_ALPHA);
aThebesContext->Save();
if (oldOperator != gfxContext::OPERATOR_OVER) {
// Clip now while we paint to the temporary surface. For
// non-source-bounded operators (e.g., SOURCE), we need to do clip
// here after we've pushed the group, so that eventually popping
// the group and painting it will be able to clear the entire
// destination surface.
aThebesContext->Clip();
aThebesContext->SetOperator(gfxContext::OPERATOR_OVER);
}
}
nsDeviceContext* devCtx = mPresContext->DeviceContext();
gfxPoint offset(-nsPresContext::AppUnitsToFloatCSSPixels(aRect.x),
-nsPresContext::AppUnitsToFloatCSSPixels(aRect.y));
gfxFloat scale = gfxFloat(devCtx->AppUnitsPerDevPixel())/nsPresContext::AppUnitsPerCSSPixel();
// Since canvas APIs use floats to set up their matrices, we may have some
// slight rounding errors here. We use NudgeToIntegers() here to adjust
// matrix components that are integers up to the accuracy of floats to be
// those integers.
gfxMatrix newTM = aThebesContext->CurrentMatrix().Translate(offset).
Scale(scale, scale).
NudgeToIntegers();
aThebesContext->SetMatrix(newTM);
AutoSaveRestoreRenderingState _(this);
nsRenderingContext rc(aThebesContext);
bool wouldFlushRetainedLayers = false;
uint32_t flags = nsLayoutUtils::PAINT_IGNORE_SUPPRESSION;
if (aThebesContext->CurrentMatrix().HasNonIntegerTranslation()) {
flags |= nsLayoutUtils::PAINT_IN_TRANSFORM;
}
if (!(aFlags & RENDER_ASYNC_DECODE_IMAGES)) {
flags |= nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES;
}
if (aFlags & RENDER_USE_WIDGET_LAYERS) {
// We only support using widget layers on display root's with widgets.
nsView* view = rootFrame->GetView();
if (view && view->GetWidget() &&
nsLayoutUtils::GetDisplayRootFrame(rootFrame) == rootFrame) {
LayerManager* layerManager = view->GetWidget()->GetLayerManager();
// ClientLayerManagers in content processes don't support
// taking snapshots.
if (layerManager &&
(!layerManager->AsClientLayerManager() ||
XRE_GetProcessType() == GeckoProcessType_Default)) {
flags |= nsLayoutUtils::PAINT_WIDGET_LAYERS;
}
}
}
if (!(aFlags & RENDER_CARET)) {
wouldFlushRetainedLayers = true;
flags |= nsLayoutUtils::PAINT_HIDE_CARET;
}
if (aFlags & RENDER_IGNORE_VIEWPORT_SCROLLING) {
wouldFlushRetainedLayers = !IgnoringViewportScrolling();
mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_IGNORING_VIEWPORT_SCROLLING);
}
if (aFlags & RENDER_DRAWWINDOW_NOT_FLUSHING) {
mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_DRAWWINDOW_NOT_FLUSHING);
}
if (aFlags & RENDER_DOCUMENT_RELATIVE) {
// XXX be smarter about this ... drawWindow might want a rect
// that's "pretty close" to what our retained layer tree covers.
// In that case, it wouldn't disturb normal rendering too much,
// and we should allow it.
wouldFlushRetainedLayers = true;
flags |= nsLayoutUtils::PAINT_DOCUMENT_RELATIVE;
}
// Don't let drawWindow blow away our retained layer tree
if ((flags & nsLayoutUtils::PAINT_WIDGET_LAYERS) && wouldFlushRetainedLayers) {
flags &= ~nsLayoutUtils::PAINT_WIDGET_LAYERS;
}
nsLayoutUtils::PaintFrame(&rc, rootFrame, nsRegion(aRect),
aBackgroundColor, flags);
// if we had to use a group, paint it to the destination now
if (needsGroup) {
aThebesContext->Restore();
aThebesContext->PopGroupToSource();
aThebesContext->Paint();
}
return NS_OK;
}
/*
* Clip the display list aList to a range. Returns the clipped
* rectangle surrounding the range.
*/
nsRect
PresShell::ClipListToRange(nsDisplayListBuilder *aBuilder,
nsDisplayList* aList,
nsRange* aRange)
{
// iterate though the display items and add up the bounding boxes of each.
// This will allow the total area of the frames within the range to be
// determined. To do this, remove an item from the bottom of the list, check
// whether it should be part of the range, and if so, append it to the top
// of the temporary list tmpList. If the item is a text frame at the end of
// the selection range, clip it to the portion of the text frame that is
// part of the selection. Then, append the wrapper to the top of the list.
// Otherwise, just delete the item and don't append it.
nsRect surfaceRect;
nsDisplayList tmpList;
nsDisplayItem* i;
while ((i = aList->RemoveBottom())) {
// itemToInsert indiciates the item that should be inserted into the
// temporary list. If null, no item should be inserted.
nsDisplayItem* itemToInsert = nullptr;
nsIFrame* frame = i->Frame();
nsIContent* content = frame->GetContent();
if (content) {
bool atStart = (content == aRange->GetStartParent());
bool atEnd = (content == aRange->GetEndParent());
if ((atStart || atEnd) && frame->GetType() == nsGkAtoms::textFrame) {
int32_t frameStartOffset, frameEndOffset;
frame->GetOffsets(frameStartOffset, frameEndOffset);
int32_t hilightStart =
atStart ? std::max(aRange->StartOffset(), frameStartOffset) : frameStartOffset;
int32_t hilightEnd =
atEnd ? std::min(aRange->EndOffset(), frameEndOffset) : frameEndOffset;
if (hilightStart < hilightEnd) {
// determine the location of the start and end edges of the range.
nsPoint startPoint, endPoint;
frame->GetPointFromOffset(hilightStart, &startPoint);
frame->GetPointFromOffset(hilightEnd, &endPoint);
// the clip rectangle is determined by taking the the start and
// end points of the range, offset from the reference frame.
// Because of rtl, the end point may be to the left of the
// start point, so x is set to the lowest value
nsRect textRect(aBuilder->ToReferenceFrame(frame), frame->GetSize());
nscoord x = std::min(startPoint.x, endPoint.x);
textRect.x += x;
textRect.width = std::max(startPoint.x, endPoint.x) - x;
surfaceRect.UnionRect(surfaceRect, textRect);
DisplayItemClip newClip;
newClip.SetTo(textRect);
newClip.IntersectWith(i->GetClip());
i->SetClip(aBuilder, newClip);
itemToInsert = i;
}
}
// Don't try to descend into subdocuments.
// If this ever changes we'd need to add handling for subdocuments with
// different zoom levels.
else if (content->GetCurrentDoc() ==
aRange->GetStartParent()->GetCurrentDoc()) {
// if the node is within the range, append it to the temporary list
bool before, after;
nsresult rv =
nsRange::CompareNodeToRange(content, aRange, &before, &after);
if (NS_SUCCEEDED(rv) && !before && !after) {
itemToInsert = i;
bool snap;
surfaceRect.UnionRect(surfaceRect, i->GetBounds(aBuilder, &snap));
}
}
}
// insert the item into the list if necessary. If the item has a child
// list, insert that as well
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (itemToInsert || sublist) {
tmpList.AppendToTop(itemToInsert ? itemToInsert : i);
// if the item is a list, iterate over it as well
if (sublist)
surfaceRect.UnionRect(surfaceRect,
ClipListToRange(aBuilder, sublist, aRange));
}
else {
// otherwise, just delete the item and don't readd it to the list
i->~nsDisplayItem();
}
}
// now add all the items back onto the original list again
aList->AppendToTop(&tmpList);
return surfaceRect;
}
#ifdef DEBUG
#include <stdio.h>
static bool gDumpRangePaintList = false;
#endif
RangePaintInfo*
PresShell::CreateRangePaintInfo(nsIDOMRange* aRange,
nsRect& aSurfaceRect,
bool aForPrimarySelection)
{
RangePaintInfo* info = nullptr;
nsRange* range = static_cast<nsRange*>(aRange);
nsIFrame* ancestorFrame;
nsIFrame* rootFrame = GetRootFrame();
// If the start or end of the range is the document, just use the root
// frame, otherwise get the common ancestor of the two endpoints of the
// range.
nsINode* startParent = range->GetStartParent();
nsINode* endParent = range->GetEndParent();
nsIDocument* doc = startParent->GetCrossShadowCurrentDoc();
if (startParent == doc || endParent == doc) {
ancestorFrame = rootFrame;
}
else {
nsINode* ancestor = nsContentUtils::GetCommonAncestor(startParent, endParent);
NS_ASSERTION(!ancestor || ancestor->IsNodeOfType(nsINode::eCONTENT),
"common ancestor is not content");
if (!ancestor || !ancestor->IsNodeOfType(nsINode::eCONTENT))
return nullptr;
nsIContent* ancestorContent = static_cast<nsIContent*>(ancestor);
ancestorFrame = ancestorContent->GetPrimaryFrame();
// use the nearest ancestor frame that includes all continuations as the
// root for building the display list
while (ancestorFrame &&
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(ancestorFrame))
ancestorFrame = ancestorFrame->GetParent();
}
if (!ancestorFrame)
return nullptr;
info = new RangePaintInfo(range, ancestorFrame);
// get a display list containing the range
info->mBuilder.SetIncludeAllOutOfFlows();
if (aForPrimarySelection) {
info->mBuilder.SetSelectedFramesOnly();
}
info->mBuilder.EnterPresShell(ancestorFrame);
ancestorFrame->BuildDisplayListForStackingContext(&info->mBuilder,
ancestorFrame->GetVisualOverflowRect(), &info->mList);
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- before ClipListToRange:\n");
nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
nsRect rangeRect = ClipListToRange(&info->mBuilder, &info->mList, range);
info->mBuilder.LeavePresShell(ancestorFrame);
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- after ClipListToRange:\n");
nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
// determine the offset of the reference frame for the display list
// to the root frame. This will allow the coordinates used when painting
// to all be offset from the same point
info->mRootOffset = ancestorFrame->GetOffsetTo(rootFrame);
rangeRect.MoveBy(info->mRootOffset);
aSurfaceRect.UnionRect(aSurfaceRect, rangeRect);
return info;
}
TemporaryRef<SourceSurface>
PresShell::PaintRangePaintInfo(nsTArray<nsAutoPtr<RangePaintInfo> >* aItems,
nsISelection* aSelection,
nsIntRegion* aRegion,
nsRect aArea,
nsIntPoint& aPoint,
nsIntRect* aScreenRect)
{
nsPresContext* pc = GetPresContext();
if (!pc || aArea.width == 0 || aArea.height == 0)
return nullptr;
// use the rectangle to create the surface
nsIntRect pixelArea = aArea.ToOutsidePixels(pc->AppUnitsPerDevPixel());
// if the area of the image is larger than the maximum area, scale it down
float scale = 0.0;
nsIntRect rootScreenRect =
GetRootFrame()->GetScreenRectInAppUnits().ToNearestPixels(
pc->AppUnitsPerDevPixel());
// if the image is larger in one or both directions than half the size of
// the available screen area, scale the image down to that size.
nsRect maxSize;
pc->DeviceContext()->GetClientRect(maxSize);
nscoord maxWidth = pc->AppUnitsToDevPixels(maxSize.width >> 1);
nscoord maxHeight = pc->AppUnitsToDevPixels(maxSize.height >> 1);
bool resize = (pixelArea.width > maxWidth || pixelArea.height > maxHeight);
if (resize) {
scale = 1.0;
// divide the maximum size by the image size in both directions. Whichever
// direction produces the smallest result determines how much should be
// scaled.
if (pixelArea.width > maxWidth)
scale = std::min(scale, float(maxWidth) / pixelArea.width);
if (pixelArea.height > maxHeight)
scale = std::min(scale, float(maxHeight) / pixelArea.height);
pixelArea.width = NSToIntFloor(float(pixelArea.width) * scale);
pixelArea.height = NSToIntFloor(float(pixelArea.height) * scale);
// adjust the screen position based on the rescaled size
nscoord left = rootScreenRect.x + pixelArea.x;
nscoord top = rootScreenRect.y + pixelArea.y;
aScreenRect->x = NSToIntFloor(aPoint.x - float(aPoint.x - left) * scale);
aScreenRect->y = NSToIntFloor(aPoint.y - float(aPoint.y - top) * scale);
}
else {
// move aScreenRect to the position of the surface in screen coordinates
aScreenRect->MoveTo(rootScreenRect.x + pixelArea.x, rootScreenRect.y + pixelArea.y);
}
aScreenRect->width = pixelArea.width;
aScreenRect->height = pixelArea.height;
RefPtr<DrawTarget> dt =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
IntSize(pixelArea.width, pixelArea.height),
SurfaceFormat::B8G8R8A8);
if (!dt) {
return nullptr;
}
nsRefPtr<gfxContext> ctx = new gfxContext(dt);
if (aRegion) {
// Convert aRegion from CSS pixels to dev pixels
nsIntRegion region =
aRegion->ToAppUnits(nsPresContext::AppUnitsPerCSSPixel())
.ToOutsidePixels(pc->AppUnitsPerDevPixel());
nsIntRegionRectIterator iter(region);
const nsIntRect* rect;
while ((rect = iter.Next())) {
ctx->Clip(gfxRect(rect->x, rect->y, rect->width, rect->height));
}
}
nsRenderingContext rc(ctx);
gfxMatrix initialTM = ctx->CurrentMatrix();
if (resize)
initialTM.Scale(scale, scale);
// translate so that points are relative to the surface area
gfxPoint surfaceOffset =
nsLayoutUtils::PointToGfxPoint(-aArea.TopLeft(), pc->AppUnitsPerDevPixel());
initialTM.Translate(surfaceOffset);
// temporarily hide the selection so that text is drawn normally. If a
// selection is being rendered, use that, otherwise use the presshell's
// selection.
nsRefPtr<nsFrameSelection> frameSelection;
if (aSelection) {
frameSelection = static_cast<Selection*>(aSelection)->GetFrameSelection();
}
else {
frameSelection = FrameSelection();
}
int16_t oldDisplaySelection = frameSelection->GetDisplaySelection();
frameSelection->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
// next, paint each range in the selection
int32_t count = aItems->Length();
for (int32_t i = 0; i < count; i++) {
RangePaintInfo* rangeInfo = (*aItems)[i];
// the display lists paint relative to the offset from the reference
// frame, so account for that translation too:
gfxPoint rootOffset =
nsLayoutUtils::PointToGfxPoint(rangeInfo->mRootOffset,
pc->AppUnitsPerDevPixel());
ctx->SetMatrix(initialTM.Translate(rootOffset));
aArea.MoveBy(-rangeInfo->mRootOffset.x, -rangeInfo->mRootOffset.y);
nsRegion visible(aArea);
nsRefPtr<LayerManager> layerManager =
rangeInfo->mList.PaintRoot(&rangeInfo->mBuilder, &rc,
nsDisplayList::PAINT_DEFAULT);
aArea.MoveBy(rangeInfo->mRootOffset.x, rangeInfo->mRootOffset.y);
}
// restore the old selection display state
frameSelection->SetDisplaySelection(oldDisplaySelection);
return dt->Snapshot();
}
TemporaryRef<SourceSurface>
PresShell::RenderNode(nsIDOMNode* aNode,
nsIntRegion* aRegion,
nsIntPoint& aPoint,
nsIntRect* aScreenRect)
{
// area will hold the size of the surface needed to draw the node, measured
// from the root frame.
nsRect area;
nsTArray<nsAutoPtr<RangePaintInfo> > rangeItems;
// nothing to draw if the node isn't in a document
nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
if (!node->IsInDoc())
return nullptr;
nsRefPtr<nsRange> range = new nsRange(node);
if (NS_FAILED(range->SelectNode(aNode)))
return nullptr;
RangePaintInfo* info = CreateRangePaintInfo(range, area, false);
if (info && !rangeItems.AppendElement(info)) {
delete info;
return nullptr;
}
if (aRegion) {
// combine the area with the supplied region
nsIntRect rrectPixels = aRegion->GetBounds();
nsRect rrect = rrectPixels.ToAppUnits(nsPresContext::AppUnitsPerCSSPixel());
area.IntersectRect(area, rrect);
nsPresContext* pc = GetPresContext();
if (!pc)
return nullptr;
// move the region so that it is offset from the topleft corner of the surface
aRegion->MoveBy(-pc->AppUnitsToDevPixels(area.x),
-pc->AppUnitsToDevPixels(area.y));
}
return PaintRangePaintInfo(&rangeItems, nullptr, aRegion, area, aPoint,
aScreenRect);
}
TemporaryRef<SourceSurface>
PresShell::RenderSelection(nsISelection* aSelection,
nsIntPoint& aPoint,
nsIntRect* aScreenRect)
{
// area will hold the size of the surface needed to draw the selection,
// measured from the root frame.
nsRect area;
nsTArray<nsAutoPtr<RangePaintInfo> > rangeItems;
// iterate over each range and collect them into the rangeItems array.
// This is done so that the size of selection can be determined so as
// to allocate a surface area
int32_t numRanges;
aSelection->GetRangeCount(&numRanges);
NS_ASSERTION(numRanges > 0, "RenderSelection called with no selection");
for (int32_t r = 0; r < numRanges; r++)
{
nsCOMPtr<nsIDOMRange> range;
aSelection->GetRangeAt(r, getter_AddRefs(range));
RangePaintInfo* info = CreateRangePaintInfo(range, area, true);
if (info && !rangeItems.AppendElement(info)) {
delete info;
return nullptr;
}
}
return PaintRangePaintInfo(&rangeItems, aSelection, nullptr, area, aPoint,
aScreenRect);
}
void
PresShell::AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds)
{
aList.AppendNewToBottom(new (&aBuilder)
nsDisplaySolidColor(&aBuilder, aFrame, aBounds, NS_RGB(115, 115, 115)));
}
static bool
AddCanvasBackgroundColor(const nsDisplayList& aList, nsIFrame* aCanvasFrame,
nscolor aColor, bool aCSSBackgroundColor)
{
for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
if (i->Frame() == aCanvasFrame &&
i->GetType() == nsDisplayItem::TYPE_CANVAS_BACKGROUND_COLOR) {
nsDisplayCanvasBackgroundColor* bg = static_cast<nsDisplayCanvasBackgroundColor*>(i);
bg->SetExtraBackgroundColor(aColor);
return true;
}
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (sublist &&
!(i->GetType() == nsDisplayItem::TYPE_BLEND_CONTAINER && !aCSSBackgroundColor) &&
AddCanvasBackgroundColor(*sublist, aCanvasFrame, aColor, aCSSBackgroundColor))
return true;
}
return false;
}
void
PresShell::AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor,
uint32_t aFlags)
{
if (aBounds.IsEmpty()) {
return;
}
// We don't want to add an item for the canvas background color if the frame
// (sub)tree we are painting doesn't include any canvas frames. There isn't
// an easy way to check this directly, but if we check if the root of the
// (sub)tree we are painting is a canvas frame that should cover us in all
// cases (it will usually be a viewport frame when we have a canvas frame in
// the (sub)tree).
if (!(aFlags & nsIPresShell::FORCE_DRAW) &&
!nsCSSRendering::IsCanvasFrame(aFrame)) {
return;
}
nscolor bgcolor = NS_ComposeColors(aBackstopColor, mCanvasBackgroundColor);
if (NS_GET_A(bgcolor) == 0)
return;
// To make layers work better, we want to avoid having a big non-scrolled
// color background behind a scrolled transparent background. Instead,
// we'll try to move the color background into the scrolled content
// by making nsDisplayCanvasBackground paint it.
if (!aFrame->GetParent()) {
nsIScrollableFrame* sf =
aFrame->PresContext()->PresShell()->GetRootScrollFrameAsScrollable();
if (sf) {
nsCanvasFrame* canvasFrame = do_QueryFrame(sf->GetScrolledFrame());
if (canvasFrame && canvasFrame->IsVisibleForPainting(&aBuilder)) {
if (AddCanvasBackgroundColor(aList, canvasFrame, bgcolor, mHasCSSBackgroundColor))
return;
}
}
}
aList.AppendNewToBottom(
new (&aBuilder) nsDisplaySolidColor(&aBuilder, aFrame, aBounds, bgcolor));
}
static bool IsTransparentContainerElement(nsPresContext* aPresContext)
{
nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
if (!docShell) {
return false;
}
nsCOMPtr<nsPIDOMWindow> pwin = docShell->GetWindow();
if (!pwin)
return false;
nsCOMPtr<Element> containerElement = pwin->GetFrameElementInternal();
return containerElement &&
containerElement->HasAttr(kNameSpaceID_None, nsGkAtoms::transparent);
}
nscolor PresShell::GetDefaultBackgroundColorToDraw()
{
if (!mPresContext || !mPresContext->GetBackgroundColorDraw()) {
return NS_RGB(255,255,255);
}
return mPresContext->DefaultBackgroundColor();
}
void PresShell::UpdateCanvasBackground()
{
// If we have a frame tree and it has style information that
// specifies the background color of the canvas, update our local
// cache of that color.
nsIFrame* rootStyleFrame = FrameConstructor()->GetRootElementStyleFrame();
if (rootStyleFrame) {
nsStyleContext* bgStyle =
nsCSSRendering::FindRootFrameBackground(rootStyleFrame);
// XXX We should really be passing the canvasframe, not the root element
// style frame but we don't have access to the canvasframe here. It isn't
// a problem because only a few frames can return something other than true
// and none of them would be a canvas frame or root element style frame.
bool drawBackgroundImage;
bool drawBackgroundColor;
mCanvasBackgroundColor =
nsCSSRendering::DetermineBackgroundColor(mPresContext, bgStyle,
rootStyleFrame,
drawBackgroundImage,
drawBackgroundColor);
mHasCSSBackgroundColor = drawBackgroundColor;
if (GetPresContext()->IsCrossProcessRootContentDocument() &&
!IsTransparentContainerElement(mPresContext)) {
mCanvasBackgroundColor =
NS_ComposeColors(GetDefaultBackgroundColorToDraw(), mCanvasBackgroundColor);
}
}
// If the root element of the document (ie html) has style 'display: none'
// then the document's background color does not get drawn; cache the
// color we actually draw.
if (!FrameConstructor()->GetRootElementFrame()) {
mCanvasBackgroundColor = GetDefaultBackgroundColorToDraw();
}
if (XRE_GetProcessType() == GeckoProcessType_Content) {
if (TabChild* tabChild = TabChild::GetFrom(this)) {
tabChild->SetBackgroundColor(mCanvasBackgroundColor);
}
}
}
nscolor PresShell::ComputeBackstopColor(nsView* aDisplayRoot)
{
nsIWidget* widget = aDisplayRoot->GetWidget();
if (widget && (widget->GetTransparencyMode() != eTransparencyOpaque ||
widget->WidgetPaintsBackground())) {
// Within a transparent widget, so the backstop color must be
// totally transparent.
return NS_RGBA(0,0,0,0);
}
// Within an opaque widget (or no widget at all), so the backstop
// color must be totally opaque. The user's default background
// as reported by the prescontext is guaranteed to be opaque.
return GetDefaultBackgroundColorToDraw();
}
struct PaintParams {
nscolor mBackgroundColor;
};
LayerManager* PresShell::GetLayerManager()
{
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->GetLayerManager();
}
}
return nullptr;
}
void PresShell::SetIgnoreViewportScrolling(bool aIgnore)
{
if (IgnoringViewportScrolling() == aIgnore) {
return;
}
RenderingState state(this);
state.mRenderFlags = ChangeFlag(state.mRenderFlags, aIgnore,
STATE_IGNORING_VIEWPORT_SCROLLING);
SetRenderingState(state);
}
nsresult PresShell::SetResolution(float aXResolution, float aYResolution)
{
if (!(aXResolution > 0.0 && aYResolution > 0.0)) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (aXResolution == mXResolution && aYResolution == mYResolution) {
return NS_OK;
}
RenderingState state(this);
state.mXResolution = aXResolution;
state.mYResolution = aYResolution;
SetRenderingState(state);
return NS_OK;
}
gfxSize PresShell::GetCumulativeResolution()
{
gfxSize resolution = GetResolution();
nsPresContext* parentCtx = GetPresContext()->GetParentPresContext();
if (parentCtx) {
resolution = resolution * parentCtx->PresShell()->GetCumulativeResolution();
}
return resolution;
}
void PresShell::SetRenderingState(const RenderingState& aState)
{
if (mRenderFlags != aState.mRenderFlags) {
// Rendering state changed in a way that forces us to flush any
// retained layers we might already have.
LayerManager* manager = GetLayerManager();
if (manager) {
FrameLayerBuilder::InvalidateAllLayers(manager);
}
}
mRenderFlags = aState.mRenderFlags;
mXResolution = aState.mXResolution;
mYResolution = aState.mYResolution;
}
void PresShell::SynthesizeMouseMove(bool aFromScroll)
{
if (!sSynthMouseMove)
return;
if (mPaintingSuppressed || !mIsActive || !mPresContext) {
return;
}
if (!mPresContext->IsRoot()) {
nsIPresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->SynthesizeMouseMove(aFromScroll);
}
return;
}
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE))
return;
if (!mSynthMouseMoveEvent.IsPending()) {
nsRefPtr<nsSynthMouseMoveEvent> ev =
new nsSynthMouseMoveEvent(this, aFromScroll);
if (!GetPresContext()->RefreshDriver()->AddRefreshObserver(ev,
Flush_Display)) {
NS_WARNING("failed to dispatch nsSynthMouseMoveEvent");
return;
}
mSynthMouseMoveEvent = ev;
}
}
/**
* Find the first floating view with a widget in a postorder traversal of the
* view tree that contains the point. Thus more deeply nested floating views
* are preferred over their ancestors, and floating views earlier in the
* view hierarchy (i.e., added later) are preferred over their siblings.
* This is adequate for finding the "topmost" floating view under a point,
* given that floating views don't supporting having a specific z-index.
*
* We cannot exit early when aPt is outside the view bounds, because floating
* views aren't necessarily included in their parent's bounds, so this could
* traverse the entire view hierarchy --- use carefully.
*/
static nsView* FindFloatingViewContaining(nsView* aView, nsPoint aPt)
{
if (aView->GetVisibility() == nsViewVisibility_kHide)
// No need to look into descendants.
return nullptr;
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
!frame->PresContext()->PresShell()->IsActive()) {
return nullptr;
}
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindFloatingViewContaining(v, v->ConvertFromParentCoords(aPt));
if (r)
return r;
}
if (aView->GetFloating() && aView->HasWidget() &&
aView->GetDimensions().Contains(aPt))
return aView;
return nullptr;
}
/*
* This finds the first view containing the given point in a postorder
* traversal of the view tree that contains the point, assuming that the
* point is not in a floating view. It assumes that only floating views
* extend outside the bounds of their parents.
*
* This methods should only be called if FindFloatingViewContaining
* returns null.
*/
static nsView* FindViewContaining(nsView* aView, nsPoint aPt)
{
if (!aView->GetDimensions().Contains(aPt) ||
aView->GetVisibility() == nsViewVisibility_kHide) {
return nullptr;
}
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
!frame->PresContext()->PresShell()->IsActive()) {
return nullptr;
}
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindViewContaining(v, v->ConvertFromParentCoords(aPt));
if (r)
return r;
}
return aView;
}
void
PresShell::ProcessSynthMouseMoveEvent(bool aFromScroll)
{
// If drag session has started, we shouldn't synthesize mousemove event.
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (dragSession) {
mSynthMouseMoveEvent.Forget();
return;
}
// allow new event to be posted while handling this one only if the
// source of the event is a scroll (to prevent infinite reflow loops)
if (aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
nsView* rootView = mViewManager ? mViewManager->GetRootView() : nullptr;
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) ||
!rootView || !rootView->HasWidget() || !mPresContext) {
mSynthMouseMoveEvent.Forget();
return;
}
NS_ASSERTION(mPresContext->IsRoot(), "Only a root pres shell should be here");
// Hold a ref to ourselves so DispatchEvent won't destroy us (since
// we need to access members after we call DispatchEvent).
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]synthesizing mouse move to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
int32_t APD = mPresContext->AppUnitsPerDevPixel();
// We need a widget to put in the event we are going to dispatch so we look
// for a view that has a widget and the mouse location is over. We first look
// for floating views, if there isn't one we use the root view. |view| holds
// that view.
nsView* view = nullptr;
// The appunits per devpixel ratio of |view|.
int32_t viewAPD;
// refPoint will be mMouseLocation relative to the widget of |view|, the
// widget we will put in the event we dispatch, in viewAPD appunits
nsPoint refpoint(0, 0);
// We always dispatch the event to the pres shell that contains the view that
// the mouse is over. pointVM is the VM of that pres shell.
nsViewManager *pointVM = nullptr;
// This could be a bit slow (traverses entire view hierarchy)
// but it's OK to do it once per synthetic mouse event
view = FindFloatingViewContaining(rootView, mMouseLocation);
if (!view) {
view = rootView;
nsView *pointView = FindViewContaining(rootView, mMouseLocation);
// pointView can be null in situations related to mouse capture
pointVM = (pointView ? pointView : view)->GetViewManager();
refpoint = mMouseLocation + rootView->ViewToWidgetOffset();
viewAPD = APD;
} else {
pointVM = view->GetViewManager();
nsIFrame* frame = view->GetFrame();
NS_ASSERTION(frame, "floating views can't be anonymous");
viewAPD = frame->PresContext()->AppUnitsPerDevPixel();
refpoint = mMouseLocation.ConvertAppUnits(APD, viewAPD);
refpoint -= view->GetOffsetTo(rootView);
refpoint += view->ViewToWidgetOffset();
}
NS_ASSERTION(view->GetWidget(), "view should have a widget here");
WidgetMouseEvent event(true, NS_MOUSE_MOVE, view->GetWidget(),
WidgetMouseEvent::eSynthesized);
event.refPoint = LayoutDeviceIntPoint::FromAppUnitsToNearest(refpoint, viewAPD);
event.time = PR_IntervalNow();
// XXX set event.modifiers ?
// XXX mnakano I think that we should get the latest information from widget.
nsCOMPtr<nsIPresShell> shell = pointVM->GetPresShell();
if (shell) {
shell->DispatchSynthMouseMove(&event, !aFromScroll);
}
if (!aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
}
/* static */ void
PresShell::MarkImagesInListVisible(const nsDisplayList& aList)
{
for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
nsDisplayList* sublist = item->GetChildren();
if (sublist) {
MarkImagesInListVisible(*sublist);
continue;
}
nsIFrame* f = item->Frame();
// We could check the type of the display item, only a handful can hold an
// image loading content.
// dont bother nscomptr here, it is wasteful
nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(f->GetContent()));
if (content) {
// use the presshell containing the image
PresShell* presShell = static_cast<PresShell*>(f->PresContext()->PresShell());
uint32_t count = presShell->mVisibleImages.Count();
presShell->mVisibleImages.PutEntry(content);
if (presShell->mVisibleImages.Count() > count) {
// content was added to mVisibleImages, so we need to increment its visible count
content->IncrementVisibleCount();
}
}
}
}
static PLDHashOperator
RemoveAndStore(nsRefPtrHashKey<nsIImageLoadingContent>* aEntry, void* userArg)
{
nsTArray< nsRefPtr<nsIImageLoadingContent> >* array =
static_cast< nsTArray< nsRefPtr<nsIImageLoadingContent> >* >(userArg);
array->AppendElement(aEntry->GetKey());
return PL_DHASH_REMOVE;
}
void
PresShell::RebuildImageVisibilityDisplayList(const nsDisplayList& aList)
{
MOZ_ASSERT(!mImageVisibilityVisited, "already visited?");
mImageVisibilityVisited = true;
// Remove the entries of the mVisibleImages hashtable and put them in the
// beforeImageList array.
nsTArray< nsRefPtr<nsIImageLoadingContent> > beforeImageList;
beforeImageList.SetCapacity(mVisibleImages.Count());
mVisibleImages.EnumerateEntries(RemoveAndStore, &beforeImageList);
MarkImagesInListVisible(aList);
for (size_t i = 0; i < beforeImageList.Length(); ++i) {
beforeImageList[i]->DecrementVisibleCount();
}
}
/* static */ void
PresShell::ClearImageVisibilityVisited(nsView* aView, bool aClear)
{
nsViewManager* vm = aView->GetViewManager();
if (aClear) {
PresShell* presShell = static_cast<PresShell*>(vm->GetPresShell());
if (!presShell->mImageVisibilityVisited) {
presShell->ClearVisibleImagesList();
}
presShell->mImageVisibilityVisited = false;
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
ClearImageVisibilityVisited(v, v->GetViewManager() != vm);
}
}
static PLDHashOperator
DecrementVisibleCount(nsRefPtrHashKey<nsIImageLoadingContent>* aEntry, void* userArg)
{
aEntry->GetKey()->DecrementVisibleCount();
return PL_DHASH_NEXT;
}
void
PresShell::ClearVisibleImagesList()
{
mVisibleImages.EnumerateEntries(DecrementVisibleCount, nullptr);
mVisibleImages.Clear();
}
void
PresShell::MarkImagesInSubtreeVisible(nsIFrame* aFrame, const nsRect& aRect)
{
MOZ_ASSERT(aFrame->PresContext()->PresShell() == this, "wrong presshell");
nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(aFrame->GetContent()));
if (content && aFrame->StyleVisibility()->IsVisible()) {
uint32_t count = mVisibleImages.Count();
mVisibleImages.PutEntry(content);
if (mVisibleImages.Count() > count) {
// content was added to mVisibleImages, so we need to increment its visible count
content->IncrementVisibleCount();
}
}
nsSubDocumentFrame* subdocFrame = do_QueryFrame(aFrame);
if (subdocFrame) {
nsIPresShell* presShell = subdocFrame->GetSubdocumentPresShellForPainting(
nsSubDocumentFrame::IGNORE_PAINT_SUPPRESSION);
if (presShell) {
nsRect rect = aRect;
nsIFrame* root = presShell->GetRootFrame();
if (root) {
rect.MoveBy(aFrame->GetOffsetToCrossDoc(root));
} else {
rect.MoveBy(-aFrame->GetContentRectRelativeToSelf().TopLeft());
}
rect = rect.ConvertAppUnitsRoundOut(
aFrame->PresContext()->AppUnitsPerDevPixel(),
presShell->GetPresContext()->AppUnitsPerDevPixel());
presShell->RebuildImageVisibility(&rect);
}
return;
}
nsRect rect = aRect;
nsIScrollableFrame* scrollFrame = do_QueryFrame(aFrame);
if (scrollFrame) {
nsRect displayPort;
bool usingDisplayport = nsLayoutUtils::GetDisplayPort(aFrame->GetContent(), &displayPort);
if (usingDisplayport) {
rect = displayPort;
} else {
rect = rect.Intersect(scrollFrame->GetScrollPortRect());
}
rect = scrollFrame->ExpandRectToNearlyVisible(rect);
}
bool preserves3DChildren = aFrame->Preserves3DChildren();
// we assume all images in popups are visible elsewhere, so we skip them here
const nsIFrame::ChildListIDs skip(nsIFrame::kPopupList |
nsIFrame::kSelectPopupList);
for (nsIFrame::ChildListIterator childLists(aFrame);
!childLists.IsDone(); childLists.Next()) {
if (skip.Contains(childLists.CurrentID())) {
continue;
}
nsFrameList children = childLists.CurrentList();
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
nsRect r = rect - child->GetPosition();
if (!r.IntersectRect(r, child->GetVisualOverflowRect())) {
continue;
}
if (child->IsTransformed()) {
// for children of a preserve3d element we just pass down the same dirty rect
if (!preserves3DChildren || !child->Preserves3D()) {
const nsRect overflow = child->GetVisualOverflowRectRelativeToSelf();
nsRect out;
if (nsDisplayTransform::UntransformRect(r, overflow, child, nsPoint(0,0), &out)) {
r = out;
} else {
r.SetEmpty();
}
}
}
MarkImagesInSubtreeVisible(child, r);
}
}
}
void
PresShell::RebuildImageVisibility(nsRect* aRect)
{
MOZ_ASSERT(!mImageVisibilityVisited, "already visited?");
mImageVisibilityVisited = true;
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
return;
}
// Remove the entries of the mVisibleImages hashtable and put them in the
// beforeImageList array.
nsTArray< nsRefPtr<nsIImageLoadingContent> > beforeImageList;
beforeImageList.SetCapacity(mVisibleImages.Count());
mVisibleImages.EnumerateEntries(RemoveAndStore, &beforeImageList);
nsRect vis(nsPoint(0, 0), rootFrame->GetSize());
if (aRect) {
vis = *aRect;
}
MarkImagesInSubtreeVisible(rootFrame, vis);
for (size_t i = 0; i < beforeImageList.Length(); ++i) {
beforeImageList[i]->DecrementVisibleCount();
}
}
void
PresShell::UpdateImageVisibility()
{
MOZ_ASSERT(!mPresContext || mPresContext->IsRootContentDocument(),
"updating image visibility on a non-root content document?");
mUpdateImageVisibilityEvent.Revoke();
if (mHaveShutDown || mIsDestroying) {
return;
}
// call update on that frame
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
ClearVisibleImagesList();
return;
}
RebuildImageVisibility();
ClearImageVisibilityVisited(rootFrame->GetView(), true);
#ifdef DEBUG_IMAGE_VISIBILITY_DISPLAY_LIST
// This can be used to debug the frame walker by comparing beforeImageList and
// mVisibleImages in RebuildImageVisibilityDisplayList to see if they produce
// the same results (mVisibleImages holds the images the display list thinks
// are visible, beforeImageList holds the images the frame walker thinks are
// visible).
nsDisplayListBuilder builder(rootFrame, nsDisplayListBuilder::IMAGE_VISIBILITY, false);
nsRect updateRect(nsPoint(0, 0), rootFrame->GetSize());
nsIFrame* rootScroll = GetRootScrollFrame();
if (rootScroll) {
nsIContent* content = rootScroll->GetContent();
if (content) {
nsLayoutUtils::GetDisplayPort(content, &updateRect);
}
if (IgnoringViewportScrolling()) {
builder.SetIgnoreScrollFrame(rootScroll);
// The ExpandRectToNearlyVisible that the root scroll frame would do gets short
// circuited due to us ignoring the root scroll frame, so we do it here.
nsIScrollableFrame* rootScrollable = do_QueryFrame(rootScroll);
updateRect = rootScrollable->ExpandRectToNearlyVisible(updateRect);
}
}
builder.IgnorePaintSuppression();
builder.EnterPresShell(rootFrame, updateRect);
nsDisplayList list;
rootFrame->BuildDisplayListForStackingContext(&builder, updateRect, &list);
builder.LeavePresShell(rootFrame, updateRect);
RebuildImageVisibilityDisplayList(list);
ClearImageVisibilityVisited(rootFrame->GetView(), true);
list.DeleteAll();
#endif
}
bool
PresShell::AssumeAllImagesVisible()
{
static bool sImageVisibilityEnabled = true;
static bool sImageVisibilityEnabledForBrowserElementsOnly = false;
static bool sImageVisibilityPrefCached = false;
if (!sImageVisibilityPrefCached) {
Preferences::AddBoolVarCache(&sImageVisibilityEnabled,
"layout.imagevisibility.enabled", true);
Preferences::AddBoolVarCache(&sImageVisibilityEnabledForBrowserElementsOnly,
"layout.imagevisibility.enabled_for_browser_elements_only", false);
sImageVisibilityPrefCached = true;
}
if ((!sImageVisibilityEnabled &&
!sImageVisibilityEnabledForBrowserElementsOnly) ||
!mPresContext || !mDocument) {
return true;
}
// We assume all images are visible in print, print preview, chrome, xul, and
// resource docs and don't keep track of them.
if (mPresContext->Type() == nsPresContext::eContext_PrintPreview ||
mPresContext->Type() == nsPresContext::eContext_Print ||
mPresContext->IsChrome() ||
mDocument->IsResourceDoc() ||
mDocument->IsXUL()) {
return true;
}
if (!sImageVisibilityEnabled &&
sImageVisibilityEnabledForBrowserElementsOnly) {
nsCOMPtr<nsIDocShell> docshell(mPresContext->GetDocShell());
if (!docshell || !docshell->GetIsInBrowserElement()) {
return true;
}
}
return false;
}
void
PresShell::ScheduleImageVisibilityUpdate()
{
if (AssumeAllImagesVisible())
return;
if (!mPresContext->IsRootContentDocument()) {
nsPresContext* presContext = mPresContext->GetToplevelContentDocumentPresContext();
if (!presContext)
return;
MOZ_ASSERT(presContext->IsRootContentDocument(),
"Didn't get a root prescontext from GetToplevelContentDocumentPresContext?");
presContext->PresShell()->ScheduleImageVisibilityUpdate();
return;
}
if (mHaveShutDown || mIsDestroying)
return;
if (mUpdateImageVisibilityEvent.IsPending())
return;
nsRefPtr<nsRunnableMethod<PresShell> > ev =
NS_NewRunnableMethod(this, &PresShell::UpdateImageVisibility);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
mUpdateImageVisibilityEvent = ev;
}
}
void
PresShell::EnsureImageInVisibleList(nsIImageLoadingContent* aImage)
{
if (AssumeAllImagesVisible()) {
aImage->IncrementVisibleCount();
return;
}
#ifdef DEBUG
// if it has a frame make sure its in this presshell
nsCOMPtr<nsIContent> content = do_QueryInterface(aImage);
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
if (!mVisibleImages.Contains(aImage)) {
mVisibleImages.PutEntry(aImage);
aImage->IncrementVisibleCount();
}
}
void
PresShell::RemoveImageFromVisibleList(nsIImageLoadingContent* aImage)
{
#ifdef DEBUG
// if it has a frame make sure its in this presshell
nsCOMPtr<nsIContent> content = do_QueryInterface(aImage);
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
if (AssumeAllImagesVisible()) {
MOZ_ASSERT(mVisibleImages.Count() == 0, "shouldn't have any images in the table");
return;
}
uint32_t count = mVisibleImages.Count();
mVisibleImages.RemoveEntry(aImage);
if (mVisibleImages.Count() < count) {
// aImage was in the hashtable, so we need to decrement its visible count
aImage->DecrementVisibleCount();
}
}
class nsAutoNotifyDidPaint
{
public:
nsAutoNotifyDidPaint(PresShell* aShell, uint32_t aFlags)
: mShell(aShell), mFlags(aFlags)
{
}
~nsAutoNotifyDidPaint()
{
mShell->GetPresContext()->NotifyDidPaintForSubtree(mFlags);
}
private:
PresShell* mShell;
uint32_t mFlags;
};
class AutoUpdateHitRegion
{
public:
AutoUpdateHitRegion(PresShell* aShell, nsIFrame* aFrame)
: mShell(aShell), mFrame(aFrame)
{
}
~AutoUpdateHitRegion()
{
if (XRE_GetProcessType() != GeckoProcessType_Content ||
!mFrame || !mShell) {
return;
}
TabChild* tabChild = TabChild::GetFrom(mShell);
if (!tabChild || !tabChild->GetUpdateHitRegion()) {
return;
}
nsRegion region;
nsDisplayListBuilder builder(mFrame,
nsDisplayListBuilder::EVENT_DELIVERY,
/* aBuildCert= */ false);
nsDisplayList list;
nsAutoTArray<nsIFrame*, 100> outFrames;
nsDisplayItem::HitTestState hitTestState;
builder.EnterPresShell(mFrame);
nsRect bounds = mShell->GetPresContext()->GetVisibleArea();
mFrame->BuildDisplayListForStackingContext(&builder, bounds, &list);
builder.LeavePresShell(mFrame);
list.HitTest(&builder, bounds, &hitTestState, &outFrames);
list.DeleteAll();
for (int32_t i = outFrames.Length() - 1; i >= 0; --i) {
region.Or(region, nsLayoutUtils::TransformFrameRectToAncestor(
outFrames[i], nsRect(nsPoint(0, 0), outFrames[i]->GetSize()), mFrame));
}
tabChild->UpdateHitRegion(region);
}
private:
PresShell* mShell;
nsIFrame* mFrame;
};
void
PresShell::RecordShadowStyleChange(ShadowRoot* aShadowRoot)
{
mChangedScopeStyleRoots.AppendElement(aShadowRoot->GetHost()->AsElement());
}
void
PresShell::Paint(nsView* aViewToPaint,
const nsRegion& aDirtyRegion,
uint32_t aFlags)
{
PROFILER_LABEL("PresShell", "Paint",
js::ProfileEntry::Category::GRAPHICS);
NS_ASSERTION(!mIsDestroying, "painting a destroyed PresShell");
NS_ASSERTION(aViewToPaint, "null view");
MOZ_ASSERT(!mImageVisibilityVisited, "should have been cleared");
if (!mIsActive || mIsZombie) {
return;
}
nsPresContext* presContext = GetPresContext();
AUTO_LAYOUT_PHASE_ENTRY_POINT(presContext, Paint);
nsIFrame* frame = aViewToPaint->GetFrame();
bool isRetainingManager;
LayerManager* layerManager =
aViewToPaint->GetWidget()->GetLayerManager(&isRetainingManager);
NS_ASSERTION(layerManager, "Must be in paint event");
bool shouldInvalidate = layerManager->NeedsWidgetInvalidation();
nsAutoNotifyDidPaint notifyDidPaint(this, aFlags);
AutoUpdateHitRegion updateHitRegion(this, frame);
// Whether or not we should set first paint when painting is
// suppressed is debatable. For now we'll do it because
// B2G relies on first paint to configure the viewport and
// we only want to do that when we have real content to paint.
// See Bug 798245
if (mIsFirstPaint && !mPaintingSuppressed) {
layerManager->SetIsFirstPaint();
mIsFirstPaint = false;
}
layerManager->BeginTransaction();
if (frame && isRetainingManager) {
// Try to do an empty transaction, if the frame tree does not
// need to be updated. Do not try to do an empty transaction on
// a non-retained layer manager (like the BasicLayerManager that
// draws the window title bar on Mac), because a) it won't work
// and b) below we don't want to clear NS_FRAME_UPDATE_LAYER_TREE,
// that will cause us to forget to update the real layer manager!
if (!(aFlags & PAINT_LAYERS)) {
if (layerManager->EndEmptyTransaction()) {
return;
}
NS_WARNING("Must complete empty transaction when compositing!");
}
if (!(aFlags & PAINT_SYNC_DECODE_IMAGES) &&
!(frame->GetStateBits() & NS_FRAME_UPDATE_LAYER_TREE) &&
!mNextPaintCompressed) {
NotifySubDocInvalidationFunc computeInvalidFunc =
presContext->MayHavePaintEventListenerInSubDocument() ? nsPresContext::NotifySubDocInvalidation : 0;
bool computeInvalidRect = computeInvalidFunc ||
(layerManager->GetBackendType() == LayersBackend::LAYERS_BASIC);
UniquePtr<LayerProperties> props;
if (computeInvalidRect) {
props = Move(LayerProperties::CloneFrom(layerManager->GetRoot()));
}
MaybeSetupTransactionIdAllocator(layerManager, aViewToPaint);
if (layerManager->EndEmptyTransaction((aFlags & PAINT_COMPOSITE) ?
LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE)) {
nsIntRegion invalid;
if (props) {
invalid = props->ComputeDifferences(layerManager->GetRoot(), computeInvalidFunc);
} else {
LayerProperties::ClearInvalidations(layerManager->GetRoot());
}
if (props) {
if (!invalid.IsEmpty()) {
nsIntRect bounds = invalid.GetBounds();
nsRect rect(presContext->DevPixelsToAppUnits(bounds.x),
presContext->DevPixelsToAppUnits(bounds.y),
presContext->DevPixelsToAppUnits(bounds.width),
presContext->DevPixelsToAppUnits(bounds.height));
if (shouldInvalidate) {
aViewToPaint->GetViewManager()->InvalidateViewNoSuppression(aViewToPaint, rect);
}
presContext->NotifyInvalidation(bounds, 0);
}
} else if (shouldInvalidate) {
aViewToPaint->GetViewManager()->InvalidateView(aViewToPaint);
}
frame->UpdatePaintCountForPaintedPresShells();
return;
}
}
frame->RemoveStateBits(NS_FRAME_UPDATE_LAYER_TREE);
}
if (frame) {
frame->ClearPresShellsFromLastPaint();
}
nscolor bgcolor = ComputeBackstopColor(aViewToPaint);
uint32_t flags = nsLayoutUtils::PAINT_WIDGET_LAYERS | nsLayoutUtils::PAINT_EXISTING_TRANSACTION;
if (!(aFlags & PAINT_COMPOSITE)) {
flags |= nsLayoutUtils::PAINT_NO_COMPOSITE;
}
if (aFlags & PAINT_SYNC_DECODE_IMAGES) {
flags |= nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES;
}
if (mNextPaintCompressed) {
flags |= nsLayoutUtils::PAINT_COMPRESSED;
mNextPaintCompressed = false;
}
if (frame) {
// We can paint directly into the widget using its layer manager.
nsLayoutUtils::PaintFrame(nullptr, frame, aDirtyRegion, bgcolor, flags);
return;
}
nsRefPtr<ColorLayer> root = layerManager->CreateColorLayer();
if (root) {
nsPresContext* pc = GetPresContext();
nsIntRect bounds =
pc->GetVisibleArea().ToOutsidePixels(pc->AppUnitsPerDevPixel());
bgcolor = NS_ComposeColors(bgcolor, mCanvasBackgroundColor);
root->SetColor(bgcolor);
root->SetVisibleRegion(bounds);
layerManager->SetRoot(root);
}
MaybeSetupTransactionIdAllocator(layerManager, aViewToPaint);
layerManager->EndTransaction(nullptr, nullptr, (aFlags & PAINT_COMPOSITE) ?
LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE);
}
// static
void
nsIPresShell::SetCapturingContent(nsIContent* aContent, uint8_t aFlags)
{
// If capture was set for pointer lock, don't unlock unless we are coming
// out of pointer lock explicitly.
if (!aContent && gCaptureInfo.mPointerLock &&
!(aFlags & CAPTURE_POINTERLOCK)) {
return;
}
NS_IF_RELEASE(gCaptureInfo.mContent);
// only set capturing content if allowed or the CAPTURE_IGNOREALLOWED or
// CAPTURE_POINTERLOCK flags are used.
if ((aFlags & CAPTURE_IGNOREALLOWED) || gCaptureInfo.mAllowed ||
(aFlags & CAPTURE_POINTERLOCK)) {
if (aContent) {
NS_ADDREF(gCaptureInfo.mContent = aContent);
}
// CAPTURE_POINTERLOCK is the same as CAPTURE_RETARGETTOELEMENT & CAPTURE_IGNOREALLOWED
gCaptureInfo.mRetargetToElement = ((aFlags & CAPTURE_RETARGETTOELEMENT) != 0) ||
((aFlags & CAPTURE_POINTERLOCK) != 0);
gCaptureInfo.mPreventDrag = (aFlags & CAPTURE_PREVENTDRAG) != 0;
gCaptureInfo.mPointerLock = (aFlags & CAPTURE_POINTERLOCK) != 0;
}
}
class AsyncCheckPointerCaptureStateCaller : public nsRunnable
{
public:
explicit AsyncCheckPointerCaptureStateCaller(int32_t aPointerId)
: mPointerId(aPointerId) {}
NS_IMETHOD Run()
{
nsIPresShell::CheckPointerCaptureState(mPointerId);
return NS_OK;
}
private:
int32_t mPointerId;
};
/* static */ void
nsIPresShell::SetPointerCapturingContent(uint32_t aPointerId, nsIContent* aContent)
{
PointerCaptureInfo* pointerCaptureInfo = nullptr;
gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo);
nsIContent* content = pointerCaptureInfo ? pointerCaptureInfo->mOverrideContent : nullptr;
if (!content && (nsIDOMMouseEvent::MOZ_SOURCE_MOUSE == GetPointerType(aPointerId))) {
SetCapturingContent(aContent, CAPTURE_PREVENTDRAG);
}
if (pointerCaptureInfo) {
pointerCaptureInfo->mPendingContent = aContent;
} else {
gPointerCaptureList->Put(aPointerId,
new PointerCaptureInfo(aContent, GetPointerPrimaryState(aPointerId)));
}
}
/* static */ void
nsIPresShell::ReleasePointerCapturingContent(uint32_t aPointerId, nsIContent* aContent)
{
if (gActivePointersIds->Get(aPointerId)) {
SetCapturingContent(nullptr, CAPTURE_PREVENTDRAG);
}
PointerCaptureInfo* pointerCaptureInfo = nullptr;
if (gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo) && pointerCaptureInfo) {
// Set flag to asyncronously release capture for given pointer.
pointerCaptureInfo->mReleaseContent = true;
nsRefPtr<AsyncCheckPointerCaptureStateCaller> asyncCaller =
new AsyncCheckPointerCaptureStateCaller(aPointerId);
NS_DispatchToCurrentThread(asyncCaller);
}
}
/* static */ nsIContent*
nsIPresShell::GetPointerCapturingContent(uint32_t aPointerId)
{
PointerCaptureInfo* pointerCaptureInfo = nullptr;
if (gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo) && pointerCaptureInfo) {
return pointerCaptureInfo->mOverrideContent;
}
return nullptr;
}
/* static */ bool
nsIPresShell::CheckPointerCaptureState(uint32_t aPointerId)
{
bool didDispatchEvent = false;
PointerCaptureInfo* pointerCaptureInfo = nullptr;
if (gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo) && pointerCaptureInfo) {
// If pendingContent exist or anybody calls element.releasePointerCapture
// we should dispatch lostpointercapture event to overrideContent if it exist
if (pointerCaptureInfo->mPendingContent || pointerCaptureInfo->mReleaseContent) {
if (pointerCaptureInfo->mOverrideContent) {
uint16_t pointerType = GetPointerType(aPointerId);
bool isPrimary = pointerCaptureInfo->mPrimaryState;
nsCOMPtr<nsIContent> content;
pointerCaptureInfo->mOverrideContent.swap(content);
if (pointerCaptureInfo->mReleaseContent) {
pointerCaptureInfo->mPendingContent = nullptr;
}
if (pointerCaptureInfo->Empty()) {
gPointerCaptureList->Remove(aPointerId);
}
DispatchGotOrLostPointerCaptureEvent(false, aPointerId, pointerType, isPrimary, content);
didDispatchEvent = true;
} else if (pointerCaptureInfo->mPendingContent && pointerCaptureInfo->mReleaseContent) {
// If anybody calls element.releasePointerCapture
// We should clear overrideContent and pendingContent
pointerCaptureInfo->mPendingContent = nullptr;
pointerCaptureInfo->mReleaseContent = false;
}
}
}
if (gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo) && pointerCaptureInfo) {
// If pendingContent exist we should dispatch gotpointercapture event to it
if (pointerCaptureInfo && pointerCaptureInfo->mPendingContent) {
pointerCaptureInfo->mOverrideContent = pointerCaptureInfo->mPendingContent;
pointerCaptureInfo->mPendingContent = nullptr;
pointerCaptureInfo->mReleaseContent = false;
DispatchGotOrLostPointerCaptureEvent(true, aPointerId,
GetPointerType(aPointerId),
pointerCaptureInfo->mPrimaryState,
pointerCaptureInfo->mOverrideContent);
didDispatchEvent = true;
}
}
return didDispatchEvent;
}
/* static */ uint16_t
nsIPresShell::GetPointerType(uint32_t aPointerId)
{
PointerInfo* pointerInfo = nullptr;
if (gActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
return pointerInfo->mPointerType;
}
return nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN;
}
/* static */ bool
nsIPresShell::GetPointerPrimaryState(uint32_t aPointerId)
{
PointerInfo* pointerInfo = nullptr;
if (gActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
return pointerInfo->mPrimaryState;
}
return false;
}
/* static */ bool
nsIPresShell::GetPointerInfo(uint32_t aPointerId, bool& aActiveState)
{
PointerInfo* pointerInfo = nullptr;
if (gActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
aActiveState = pointerInfo->mActiveState;
return true;
}
return false;
}
void
PresShell::UpdateActivePointerState(WidgetGUIEvent* aEvent)
{
switch (aEvent->message) {
case NS_MOUSE_ENTER:
// In this case we have to know information about available mouse pointers
if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
gActivePointersIds->Put(mouseEvent->pointerId,
new PointerInfo(false, mouseEvent->inputSource, true));
}
break;
case NS_POINTER_DOWN:
// In this case we switch pointer to active state
if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
gActivePointersIds->Put(pointerEvent->pointerId,
new PointerInfo(true, pointerEvent->inputSource, pointerEvent->isPrimary));
}
break;
case NS_POINTER_UP:
// In this case we remove information about pointer or turn off active state
if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
if(pointerEvent->inputSource != nsIDOMMouseEvent::MOZ_SOURCE_TOUCH) {
gActivePointersIds->Put(pointerEvent->pointerId,
new PointerInfo(false, pointerEvent->inputSource, pointerEvent->isPrimary));
} else {
gActivePointersIds->Remove(pointerEvent->pointerId);
}
}
break;
case NS_MOUSE_EXIT:
// In this case we have to remove information about disappeared mouse pointers
if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
gActivePointersIds->Remove(mouseEvent->pointerId);
}
break;
}
}
nsIContent*
PresShell::GetCurrentEventContent()
{
if (mCurrentEventContent &&
mCurrentEventContent->GetCrossShadowCurrentDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
return mCurrentEventContent;
}
nsIFrame*
PresShell::GetCurrentEventFrame()
{
if (MOZ_UNLIKELY(mIsDestroying)) {
return nullptr;
}
// GetCurrentEventContent() makes sure the content is still in the
// same document that this pres shell belongs to. If not, then the
// frame shouldn't get an event, nor should we even assume its safe
// to try and find the frame.
nsIContent* content = GetCurrentEventContent();
if (!mCurrentEventFrame && content) {
mCurrentEventFrame = content->GetPrimaryFrame();
MOZ_ASSERT(!mCurrentEventFrame ||
mCurrentEventFrame->PresContext()->GetPresShell() == this);
}
return mCurrentEventFrame;
}
nsIFrame*
PresShell::GetEventTargetFrame()
{
return GetCurrentEventFrame();
}
already_AddRefed<nsIContent>
PresShell::GetEventTargetContent(WidgetEvent* aEvent)
{
nsCOMPtr<nsIContent> content = GetCurrentEventContent();
if (!content) {
nsIFrame* currentEventFrame = GetCurrentEventFrame();
if (currentEventFrame) {
currentEventFrame->GetContentForEvent(aEvent, getter_AddRefs(content));
NS_ASSERTION(!content || content->GetCrossShadowCurrentDoc() == mDocument,
"handing out content from a different doc");
}
}
return content.forget();
}
void
PresShell::PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent)
{
if (mCurrentEventFrame || mCurrentEventContent) {
mCurrentEventFrameStack.InsertElementAt(0, mCurrentEventFrame);
mCurrentEventContentStack.InsertObjectAt(mCurrentEventContent, 0);
}
mCurrentEventFrame = aFrame;
mCurrentEventContent = aContent;
}
void
PresShell::PopCurrentEventInfo()
{
mCurrentEventFrame = nullptr;
mCurrentEventContent = nullptr;
if (0 != mCurrentEventFrameStack.Length()) {
mCurrentEventFrame = mCurrentEventFrameStack.ElementAt(0);
mCurrentEventFrameStack.RemoveElementAt(0);
mCurrentEventContent = mCurrentEventContentStack.ObjectAt(0);
mCurrentEventContentStack.RemoveObjectAt(0);
// Don't use it if it has moved to a different document.
if (mCurrentEventContent &&
mCurrentEventContent->GetCrossShadowCurrentDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
}
}
bool PresShell::InZombieDocument(nsIContent *aContent)
{
// If a content node points to a null document, or the document is not
// attached to a window, then it is possibly in a zombie document,
// about to be replaced by a newly loading document.
// Such documents cannot handle DOM events.
// It might actually be in a node not attached to any document,
// in which case there is not parent presshell to retarget it to.
nsIDocument* doc = aContent->GetComposedDoc();
return !doc || !doc->GetWindow();
}
already_AddRefed<nsPIDOMWindow>
PresShell::GetRootWindow()
{
nsCOMPtr<nsPIDOMWindow> window =
do_QueryInterface(mDocument->GetWindow());
if (window) {
nsCOMPtr<nsPIDOMWindow> rootWindow = window->GetPrivateRoot();
NS_ASSERTION(rootWindow, "nsPIDOMWindow::GetPrivateRoot() returns NULL");
return rootWindow.forget();
}
// If we don't have DOM window, we're zombie, we should find the root window
// with our parent shell.
nsCOMPtr<nsIPresShell> parent = GetParentPresShellForEventHandling();
NS_ENSURE_TRUE(parent, nullptr);
return parent->GetRootWindow();
}
already_AddRefed<nsIPresShell>
PresShell::GetParentPresShellForEventHandling()
{
NS_ENSURE_TRUE(mPresContext, nullptr);
// Now, find the parent pres shell and send the event there
nsCOMPtr<nsIDocShellTreeItem> treeItem = mPresContext->GetDocShell();
if (!treeItem) {
treeItem = mForwardingContainer.get();
}
// Might have gone away, or never been around to start with
NS_ENSURE_TRUE(treeItem, nullptr);
nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
treeItem->GetParent(getter_AddRefs(parentTreeItem));
nsCOMPtr<nsIDocShell> parentDocShell = do_QueryInterface(parentTreeItem);
NS_ENSURE_TRUE(parentDocShell && treeItem != parentTreeItem, nullptr);
nsCOMPtr<nsIPresShell> parentPresShell = parentDocShell->GetPresShell();
return parentPresShell.forget();
}
nsresult
PresShell::RetargetEventToParent(WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
// Send this events straight up to the parent pres shell.
// We do this for keystroke events in zombie documents or if either a frame
// or a root content is not present.
// That way at least the UI key bindings can work.
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
nsCOMPtr<nsIPresShell> parentPresShell = GetParentPresShellForEventHandling();
NS_ENSURE_TRUE(parentPresShell, NS_ERROR_FAILURE);
// Fake the event as though it's from the parent pres shell's root frame.
return parentPresShell->HandleEvent(parentPresShell->GetRootFrame(), aEvent, true, aEventStatus);
}
void
PresShell::DisableNonTestMouseEvents(bool aDisable)
{
sDisableNonTestMouseEvents = aDisable;
}
already_AddRefed<nsPIDOMWindow>
PresShell::GetFocusedDOMWindowInOurWindow()
{
nsCOMPtr<nsPIDOMWindow> rootWindow = GetRootWindow();
NS_ENSURE_TRUE(rootWindow, nullptr);
nsCOMPtr<nsPIDOMWindow> focusedWindow;
nsFocusManager::GetFocusedDescendant(rootWindow, true,
getter_AddRefs(focusedWindow));
return focusedWindow.forget();
}
void
PresShell::RecordMouseLocation(WidgetGUIEvent* aEvent)
{
if (!mPresContext)
return;
if (!mPresContext->IsRoot()) {
PresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->RecordMouseLocation(aEvent);
}
return;
}
if ((aEvent->message == NS_MOUSE_MOVE &&
aEvent->AsMouseEvent()->reason == WidgetMouseEvent::eReal) ||
aEvent->message == NS_MOUSE_ENTER ||
aEvent->message == NS_MOUSE_BUTTON_DOWN ||
aEvent->message == NS_MOUSE_BUTTON_UP) {
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
nsView* rootView = mViewManager->GetRootView();
mMouseLocation = nsLayoutUtils::TranslateWidgetToView(mPresContext,
aEvent->widget, LayoutDeviceIntPoint::ToUntyped(aEvent->refPoint),
rootView);
} else {
mMouseLocation =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, rootFrame);
}
#ifdef DEBUG_MOUSE_LOCATION
if (aEvent->message == NS_MOUSE_ENTER)
printf("[ps=%p]got mouse enter for %p\n",
this, aEvent->widget);
printf("[ps=%p]setting mouse location to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
if (aEvent->message == NS_MOUSE_ENTER)
SynthesizeMouseMove(false);
} else if (aEvent->message == NS_MOUSE_EXIT) {
// Although we only care about the mouse moving into an area for which this
// pres shell doesn't receive mouse move events, we don't check which widget
// the mouse exit was for since this seems to vary by platform. Hopefully
// this won't matter at all since we'll get the mouse move or enter after
// the mouse exit when the mouse moves from one of our widgets into another.
mMouseLocation = nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]got mouse exit for %p\n",
this, aEvent->widget);
printf("[ps=%p]clearing mouse location\n",
this);
#endif
}
}
static void
EvictTouchPoint(nsRefPtr<dom::Touch>& aTouch,
nsIDocument* aLimitToDocument = nullptr)
{
nsCOMPtr<nsINode> node(do_QueryInterface(aTouch->mTarget));
if (node) {
nsIDocument* doc = node->GetCurrentDoc();
if (doc && (!aLimitToDocument || aLimitToDocument == doc)) {
nsIPresShell* presShell = doc->GetShell();
if (presShell) {
nsIFrame* frame = presShell->GetRootFrame();
if (frame) {
nsPoint pt(aTouch->mRefPoint.x, aTouch->mRefPoint.y);
nsCOMPtr<nsIWidget> widget = frame->GetView()->GetNearestWidget(&pt);
if (widget) {
WidgetTouchEvent event(true, NS_TOUCH_END, widget);
event.widget = widget;
event.time = PR_IntervalNow();
event.touches.AppendElement(aTouch);
nsEventStatus status;
widget->DispatchEvent(&event, status);
return;
}
}
}
}
}
if (!node || !aLimitToDocument || node->OwnerDoc() == aLimitToDocument) {
// We couldn't dispatch touchend. Remove the touch from gCaptureTouchList
// explicitly.
nsIPresShell::gCaptureTouchList->Remove(aTouch->Identifier());
}
}
static PLDHashOperator
AppendToTouchList(const uint32_t& aKey, nsRefPtr<dom::Touch>& aData, void *aTouchList)
{
WidgetTouchEvent::TouchArray* touches =
static_cast<WidgetTouchEvent::TouchArray*>(aTouchList);
aData->mChanged = false;
touches->AppendElement(aData);
return PL_DHASH_NEXT;
}
void
PresShell::EvictTouches()
{
WidgetTouchEvent::AutoTouchArray touches;
gCaptureTouchList->Enumerate(&AppendToTouchList, &touches);
for (uint32_t i = 0; i < touches.Length(); ++i) {
EvictTouchPoint(touches[i], mDocument);
}
}
static PLDHashOperator
FindAnyTarget(const uint32_t& aKey, nsRefPtr<dom::Touch>& aData,
void* aAnyTarget)
{
if (aData) {
dom::EventTarget* target = aData->GetTarget();
if (target) {
nsCOMPtr<nsIContent>* content =
static_cast<nsCOMPtr<nsIContent>*>(aAnyTarget);
*content = do_QueryInterface(target);
return PL_DHASH_STOP;
}
}
return PL_DHASH_NEXT;
}
nsIFrame* GetNearestFrameContainingPresShell(nsIPresShell* aPresShell)
{
nsView* view = aPresShell->GetViewManager()->GetRootView();
while (view && !view->GetFrame()) {
view = view->GetParent();
}
nsIFrame* frame = nullptr;
if (view) {
frame = view->GetFrame();
}
return frame;
}
static bool
FlushThrottledStyles(nsIDocument *aDocument, void *aData)
{
nsIPresShell* shell = aDocument->GetShell();
if (shell && shell->IsVisible()) {
nsPresContext* presContext = shell->GetPresContext();
if (presContext) {
presContext->RestyleManager()->UpdateOnlyAnimationStyles();
}
}
return true;
}
static nsresult
DispatchPointerFromMouseOrTouch(PresShell* aShell,
nsIFrame* aFrame,
WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aStatus)
{
uint32_t pointerMessage = 0;
if (aEvent->mClass == eMouseEventClass) {
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
// if it is not mouse then it is likely will come as touch event
if (!mouseEvent->convertToPointer) {
return NS_OK;
}
int16_t button = mouseEvent->button;
switch (mouseEvent->message) {
case NS_MOUSE_MOVE:
if (mouseEvent->buttons == 0) {
button = -1;
}
pointerMessage = NS_POINTER_MOVE;
break;
case NS_MOUSE_BUTTON_UP:
pointerMessage = NS_POINTER_UP;
break;
case NS_MOUSE_BUTTON_DOWN:
pointerMessage = NS_POINTER_DOWN;
break;
default:
return NS_OK;
}
WidgetPointerEvent event(*mouseEvent);
event.message = pointerMessage;
event.button = button;
event.pressure = event.buttons ?
mouseEvent->pressure ? mouseEvent->pressure : 0.5f :
0.0f;
event.convertToPointer = mouseEvent->convertToPointer = false;
aShell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus);
} else if (aEvent->mClass == eTouchEventClass) {
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// loop over all touches and dispatch pointer events on each touch
// copy the event
switch (touchEvent->message) {
case NS_TOUCH_MOVE:
pointerMessage = NS_POINTER_MOVE;
break;
case NS_TOUCH_END:
pointerMessage = NS_POINTER_UP;
break;
case NS_TOUCH_START:
pointerMessage = NS_POINTER_DOWN;
break;
case NS_TOUCH_CANCEL:
pointerMessage = NS_POINTER_CANCEL;
break;
default:
return NS_OK;
}
for (uint32_t i = 0; i < touchEvent->touches.Length(); ++i) {
mozilla::dom::Touch* touch = touchEvent->touches[i];
if (!touch || !touch->convertToPointer) {
continue;
}
WidgetPointerEvent event(touchEvent->mFlags.mIsTrusted, pointerMessage, touchEvent->widget);
event.isPrimary = i == 0;
event.pointerId = touch->Identifier();
event.refPoint.x = touch->mRefPoint.x;
event.refPoint.y = touch->mRefPoint.y;
event.modifiers = touchEvent->modifiers;
event.width = touch->RadiusX();
event.height = touch->RadiusY();
event.tiltX = touch->tiltX;
event.tiltY = touch->tiltY;
event.time = touchEvent->time;
event.timeStamp = touchEvent->timeStamp;
event.mFlags = touchEvent->mFlags;
event.button = WidgetMouseEvent::eLeftButton;
event.buttons = WidgetMouseEvent::eLeftButtonFlag;
event.inputSource = nsIDOMMouseEvent::MOZ_SOURCE_TOUCH;
event.convertToPointer = touch->convertToPointer = false;
aShell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus);
}
}
return NS_OK;
}
class ReleasePointerCaptureCaller
{
public:
ReleasePointerCaptureCaller() :
mPointerId(0),
mContent(nullptr)
{
}
~ReleasePointerCaptureCaller()
{
if (mContent) {
nsIPresShell::ReleasePointerCapturingContent(mPointerId, mContent);
}
}
void SetTarget(uint32_t aPointerId, nsIContent* aContent)
{
mPointerId = aPointerId;
mContent = aContent;
}
private:
int32_t mPointerId;
nsCOMPtr<nsIContent> mContent;
};
static bool
CheckPermissionForBeforeAfterKeyboardEvent(Element* aElement)
{
// An element which is chrome-privileged should be able to handle before
// events and after events.
nsIPrincipal* principal = aElement->NodePrincipal();
if (nsContentUtils::IsSystemPrincipal(principal)) {
return true;
}
// An element which has "before-after-keyboard-event" permission should be
// able to handle before events and after events.
nsCOMPtr<nsIPermissionManager> permMgr = services::GetPermissionManager();
uint32_t permission = nsIPermissionManager::DENY_ACTION;
if (permMgr) {
permMgr->TestPermissionFromPrincipal(principal, "before-after-keyboard-event", &permission);
if (permission == nsIPermissionManager::ALLOW_ACTION) {
return true;
}
// Check "embed-apps" permission for later use.
permission = nsIPermissionManager::DENY_ACTION;
permMgr->TestPermissionFromPrincipal(principal, "embed-apps", &permission);
}
// An element can handle before events and after events if the following
// conditions are met:
// 1) <iframe mozbrowser mozapp>
// 2) it has "embed-apps" permission.
nsCOMPtr<nsIMozBrowserFrame> browserFrame(do_QueryInterface(aElement));
if ((permission == nsIPermissionManager::ALLOW_ACTION) &&
browserFrame && browserFrame->GetReallyIsApp()) {
return true;
}
return false;
}
static void
BuildTargetChainForBeforeAfterKeyboardEvent(nsINode* aTarget,
nsTArray<nsCOMPtr<Element> >& aChain,
bool& aTargetIsIframe)
{
nsCOMPtr<nsIContent> content(do_QueryInterface(aTarget));
aTargetIsIframe = content && content->IsHTML(nsGkAtoms::iframe);
Element* frameElement;
// If event target is not an iframe, skip the event target and get its
// parent frame.
if (aTargetIsIframe) {
frameElement = aTarget->AsElement();
} else {
nsPIDOMWindow* window = aTarget->OwnerDoc()->GetWindow();
frameElement = window ? window->GetFrameElementInternal() : nullptr;
}
// Check permission for all ancestors and add them into the target chain.
while (frameElement) {
if (CheckPermissionForBeforeAfterKeyboardEvent(frameElement)) {
aChain.AppendElement(frameElement);
}
nsPIDOMWindow* window = frameElement->OwnerDoc()->GetWindow();
frameElement = window ? window->GetFrameElementInternal() : nullptr;
}
}
void
PresShell::DispatchBeforeKeyboardEventInternal(const nsTArray<nsCOMPtr<Element> >& aChain,
const WidgetKeyboardEvent& aEvent,
size_t& aChainIndex,
bool& aDefaultPrevented)
{
size_t length = aChain.Length();
if (!CanDispatchEvent(&aEvent) || !length) {
return;
}
uint32_t message =
(aEvent.message == NS_KEY_DOWN) ? NS_KEY_BEFORE_DOWN : NS_KEY_BEFORE_UP;
nsCOMPtr<EventTarget> eventTarget;
// Dispatch before events from the outermost element.
for (int32_t i = length - 1; i >= 0; i--) {
eventTarget = do_QueryInterface(aChain[i]->OwnerDoc()->GetWindow());
if (!eventTarget || !CanDispatchEvent(&aEvent)) {
return;
}
aChainIndex = i;
InternalBeforeAfterKeyboardEvent beforeEvent(aEvent.mFlags.mIsTrusted,
message, aEvent.widget);
beforeEvent.AssignBeforeAfterKeyEventData(aEvent, false);
EventDispatcher::Dispatch(eventTarget, mPresContext, &beforeEvent);
if (beforeEvent.mFlags.mDefaultPrevented) {
aDefaultPrevented = true;
return;
}
}
}
void
PresShell::DispatchAfterKeyboardEventInternal(const nsTArray<nsCOMPtr<Element> >& aChain,
const WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled,
size_t aStartOffset)
{
size_t length = aChain.Length();
if (!CanDispatchEvent(&aEvent) || !length) {
return;
}
uint32_t message =
(aEvent.message == NS_KEY_DOWN) ? NS_KEY_AFTER_DOWN : NS_KEY_AFTER_UP;
bool embeddedCancelled = aEmbeddedCancelled;
nsCOMPtr<EventTarget> eventTarget;
// Dispatch after events from the innermost element.
for (uint32_t i = aStartOffset; i < length; i++) {
eventTarget = do_QueryInterface(aChain[i]->OwnerDoc()->GetWindow());
if (!eventTarget || !CanDispatchEvent(&aEvent)) {
return;
}
InternalBeforeAfterKeyboardEvent afterEvent(aEvent.mFlags.mIsTrusted,
message, aEvent.widget);
afterEvent.AssignBeforeAfterKeyEventData(aEvent, false);
afterEvent.mEmbeddedCancelled.SetValue(embeddedCancelled);
EventDispatcher::Dispatch(eventTarget, mPresContext, &afterEvent);
embeddedCancelled = afterEvent.mFlags.mDefaultPrevented;
}
}
void
PresShell::DispatchAfterKeyboardEvent(nsINode* aTarget,
const WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled)
{
MOZ_ASSERT(aTarget);
MOZ_ASSERT(BeforeAfterKeyboardEventEnabled());
if (NS_WARN_IF(aEvent.message != NS_KEY_DOWN &&
aEvent.message != NS_KEY_UP)) {
return;
}
// Build up a target chain. Each item in the chain will receive an after event.
nsAutoTArray<nsCOMPtr<Element>, 5> chain;
bool targetIsIframe = false;
BuildTargetChainForBeforeAfterKeyboardEvent(aTarget, chain, targetIsIframe);
DispatchAfterKeyboardEventInternal(chain, aEvent, aEmbeddedCancelled);
}
bool
PresShell::CanDispatchEvent(const WidgetGUIEvent* aEvent) const
{
bool rv =
mPresContext && !mHaveShutDown && nsContentUtils::IsSafeToRunScript();
if (aEvent) {
rv &= (aEvent && aEvent->widget && !aEvent->widget->Destroyed());
}
return rv;
}
void
PresShell::HandleKeyboardEvent(nsINode* aTarget,
WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled,
nsEventStatus* aStatus,
EventDispatchingCallback* aEventCB)
{
if (aEvent.message == NS_KEY_PRESS ||
!BeforeAfterKeyboardEventEnabled()) {
EventDispatcher::Dispatch(aTarget, mPresContext,
&aEvent, nullptr, aStatus, aEventCB);
return;
}
MOZ_ASSERT(aTarget);
MOZ_ASSERT(aEvent.message == NS_KEY_DOWN || aEvent.message == NS_KEY_UP);
// Build up a target chain. Each item in the chain will receive a before event.
nsAutoTArray<nsCOMPtr<Element>, 5> chain;
bool targetIsIframe = false;
BuildTargetChainForBeforeAfterKeyboardEvent(aTarget, chain, targetIsIframe);
// Dispatch before events. If each item in the chain consumes the before
// event and doesn't prevent the default action, we will go further to
// dispatch the actual key event and after events in the reverse order.
// Otherwise, only items which has handled the before event will receive an
// after event.
size_t chainIndex;
bool defaultPrevented = false;
DispatchBeforeKeyboardEventInternal(chain, aEvent, chainIndex,
defaultPrevented);
// Before event is default-prevented. Dispatch after events with
// embeddedCancelled = false to partial items.
if (defaultPrevented) {
*aStatus = nsEventStatus_eConsumeNoDefault;
DispatchAfterKeyboardEventInternal(chain, aEvent, false, chainIndex);
// No need to forward the event to child process.
aEvent.mFlags.mNoCrossProcessBoundaryForwarding = true;
return;
}
// Event listeners may kill nsPresContext and nsPresShell.
if (!CanDispatchEvent()) {
return;
}
// Dispatch actual key event to event target.
EventDispatcher::Dispatch(aTarget, mPresContext,
&aEvent, nullptr, aStatus, aEventCB);
if (aEvent.mFlags.mDefaultPrevented) {
// When embedder prevents the default action of actual key event, attribute
// 'embeddedCancelled' of after event is false, i.e. |!targetIsIframe|.
// On the contrary, if the defult action is prevented by embedded iframe,
// 'embeddedCancelled' is true which equals to |!targetIsIframe|.
DispatchAfterKeyboardEventInternal(chain, aEvent, !targetIsIframe, chainIndex);
return;
}
// Event listeners may kill nsPresContext and nsPresShell.
if (targetIsIframe || !CanDispatchEvent()) {
return;
}
// Dispatch after events to all items in the chain.
DispatchAfterKeyboardEventInternal(chain, aEvent,
aEvent.mFlags.mDefaultPrevented);
}
nsresult
PresShell::HandleEvent(nsIFrame* aFrame,
WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus)
{
#ifdef MOZ_TASK_TRACER
// Make touch events, mouse events and hardware key events to be the source
// events of TaskTracer, and originate the rest correlation tasks from here.
SourceEventType type = SourceEventType::Unknown;
if (WidgetTouchEvent* inputEvent = aEvent->AsTouchEvent()) {
type = SourceEventType::Touch;
} else if (WidgetMouseEvent* inputEvent = aEvent->AsMouseEvent()) {
type = SourceEventType::Mouse;
} else if (WidgetKeyboardEvent* inputEvent = aEvent->AsKeyboardEvent()) {
type = SourceEventType::Key;
}
AutoSourceEvent taskTracerEvent(type);
#endif
if (sPointerEventEnabled) {
DispatchPointerFromMouseOrTouch(this, aFrame, aEvent, aDontRetargetEvents, aEventStatus);
}
NS_ASSERTION(aFrame, "null frame");
if (mIsDestroying ||
(sDisableNonTestMouseEvents && !aEvent->mFlags.mIsSynthesizedForTests &&
aEvent->HasMouseEventMessage())) {
return NS_OK;
}
RecordMouseLocation(aEvent);
// Determine whether event need to be consumed by touch caret or not.
if (TouchCaretPrefEnabled() || SelectionCaretPrefEnabled()) {
// We have to target the focus window because regardless of where the
// touch goes, we want to access the touch caret when user is typing on an
// editable element.
nsCOMPtr<nsPIDOMWindow> window = GetFocusedDOMWindowInOurWindow();
nsCOMPtr<nsIDocument> retargetEventDoc = window ? window->GetExtantDoc() : nullptr;
nsCOMPtr<nsIPresShell> presShell = retargetEventDoc ?
retargetEventDoc->GetShell() :
nullptr;
// Bug 1057256: Touch caret should handle the event before selection carets.
// Otherwise, a long tap on touch caret will be incorrectly handled by
// selection carets which makes moving touch caret failed.
nsRefPtr<TouchCaret> touchCaret = presShell ?
presShell->GetTouchCaret() :
nullptr;
if (touchCaret) {
*aEventStatus = touchCaret->HandleEvent(aEvent);
if (*aEventStatus == nsEventStatus_eConsumeNoDefault) {
// If the event is consumed by the touch caret, cancel APZC panning by
// setting mMultipleActionsPrevented.
aEvent->mFlags.mMultipleActionsPrevented = true;
return NS_OK;
}
}
nsRefPtr<SelectionCarets> selectionCaret = presShell ?
presShell->GetSelectionCarets() :
nullptr;
if (selectionCaret) {
*aEventStatus = selectionCaret->HandleEvent(aEvent);
if (*aEventStatus == nsEventStatus_eConsumeNoDefault) {
// If the event is consumed by the selection carets, cancel APZC panning by
// setting mMultipleActionsPrevented.
aEvent->mFlags.mMultipleActionsPrevented = true;
return NS_OK;
}
}
}
if (sPointerEventEnabled) {
UpdateActivePointerState(aEvent);
}
if (!nsContentUtils::IsSafeToRunScript() &&
aEvent->IsAllowedToDispatchDOMEvent()) {
if (aEvent->mClass == eCompositionEventClass) {
IMEStateManager::OnCompositionEventDiscarded(
aEvent->AsCompositionEvent());
}
#ifdef DEBUG
if (aEvent->IsIMERelatedEvent()) {
nsPrintfCString warning("%d event is discarded", aEvent->message);
NS_WARNING(warning.get());
}
#endif
nsContentUtils::WarnScriptWasIgnored(GetDocument());
return NS_OK;
}
nsIContent* capturingContent =
(aEvent->HasMouseEventMessage() ||
aEvent->mClass == eWheelEventClass ? GetCapturingContent() : nullptr);
nsCOMPtr<nsIDocument> retargetEventDoc;
if (!aDontRetargetEvents) {
// key and IME related events should not cross top level window boundary.
// Basically, such input events should be fired only on focused widget.
// However, some IMEs might need to clean up composition after focused
// window is deactivated. And also some tests on MozMill want to test key
// handling on deactivated window because MozMill window can be activated
// during tests. So, there is no merit the events should be redirected to
// active window. So, the events should be handled on the last focused
// content in the last focused DOM window in same top level window.
// Note, if no DOM window has been focused yet, we can discard the events.
if (aEvent->IsTargetedAtFocusedWindow()) {
nsCOMPtr<nsPIDOMWindow> window = GetFocusedDOMWindowInOurWindow();
// No DOM window in same top level window has not been focused yet,
// discard the events.
if (!window) {
return NS_OK;
}
retargetEventDoc = window->GetExtantDoc();
if (!retargetEventDoc)
return NS_OK;
} else if (capturingContent) {
// if the mouse is being captured then retarget the mouse event at the
// document that is being captured.
retargetEventDoc = capturingContent->GetCrossShadowCurrentDoc();
#ifdef ANDROID
} else if (aEvent->mClass == eTouchEventClass ||
(aEvent->AsMouseEvent() && aEvent->AsMouseEvent()->inputSource == nsIDOMMouseEvent::MOZ_SOURCE_TOUCH)) {
retargetEventDoc = GetTouchEventTargetDocument();
#endif
}
if (retargetEventDoc) {
nsCOMPtr<nsIPresShell> presShell = retargetEventDoc->GetShell();
if (!presShell)
return NS_OK;
if (presShell != this) {
nsIFrame* frame = presShell->GetRootFrame();
if (!frame) {
if (aEvent->message == NS_QUERY_TEXT_CONTENT ||
aEvent->IsContentCommandEvent()) {
return NS_OK;
}
frame = GetNearestFrameContainingPresShell(presShell);
}
if (!frame)
return NS_OK;
nsCOMPtr<nsIPresShell> shell = frame->PresContext()->GetPresShell();
return shell->HandleEvent(frame, aEvent, true, aEventStatus);
}
}
}
if (aEvent->mClass == eKeyboardEventClass &&
mDocument && mDocument->EventHandlingSuppressed()) {
if (aEvent->message == NS_KEY_DOWN) {
mNoDelayedKeyEvents = true;
} else if (!mNoDelayedKeyEvents) {
DelayedEvent* event = new DelayedKeyEvent(aEvent->AsKeyboardEvent());
if (!mDelayedEvents.AppendElement(event)) {
delete event;
}
}
return NS_OK;
}
nsIFrame* frame = aFrame;
if (aEvent->IsUsingCoordinates()) {
ReleasePointerCaptureCaller releasePointerCaptureCaller;
if (nsLayoutUtils::AreAsyncAnimationsEnabled() && mDocument) {
if (aEvent->mClass == eTouchEventClass) {
nsIDocument::UnlockPointer();
}
nsWeakFrame weakFrame(frame);
{ // scope for scriptBlocker.
nsAutoScriptBlocker scriptBlocker;
GetRootPresShell()->GetDocument()->
EnumerateSubDocuments(FlushThrottledStyles, nullptr);
}
if (!weakFrame.IsAlive()) {
frame = GetNearestFrameContainingPresShell(this);
}
}
NS_WARN_IF_FALSE(frame, "Nothing to handle this event!");
if (!frame)
return NS_OK;
nsPresContext* framePresContext = frame->PresContext();
nsPresContext* rootPresContext = framePresContext->GetRootPresContext();
NS_ASSERTION(rootPresContext == mPresContext->GetRootPresContext(),
"How did we end up outside the connected prescontext/viewmanager hierarchy?");
// If we aren't starting our event dispatch from the root frame of the root prescontext,
// then someone must be capturing the mouse. In that case we don't want to search the popup
// list.
if (framePresContext == rootPresContext &&
frame == mFrameConstructor->GetRootFrame()) {
nsIFrame* popupFrame =
nsLayoutUtils::GetPopupFrameForEventCoordinates(rootPresContext, aEvent);
// If the popupFrame is an ancestor of the 'frame', the frame should
// handle the event, otherwise, the popup should handle it.
if (popupFrame &&
!nsContentUtils::ContentIsCrossDocDescendantOf(
framePresContext->GetPresShell()->GetDocument(),
popupFrame->GetContent())) {
frame = popupFrame;
}
}
bool captureRetarget = false;
if (capturingContent) {
// If a capture is active, determine if the docshell is visible. If not,
// clear the capture and target the mouse event normally instead. This
// would occur if the mouse button is held down while a tab change occurs.
// If the docshell is visible, look for a scrolling container.
bool vis;
nsCOMPtr<nsIBaseWindow> baseWin =
do_QueryInterface(mPresContext->GetContainerWeak());
if (baseWin && NS_SUCCEEDED(baseWin->GetVisibility(&vis)) && vis) {
captureRetarget = gCaptureInfo.mRetargetToElement;
if (!captureRetarget) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->GetCrossShadowCurrentDoc() == GetDocument(),
"Unexpected document");
nsIFrame* captureFrame = capturingContent->GetPrimaryFrame();
if (captureFrame) {
if (capturingContent->Tag() == nsGkAtoms::select &&
capturingContent->IsHTML()) {
// a dropdown <select> has a child in its selectPopupList and we should
// capture on that instead.
nsIFrame* childFrame = captureFrame->GetChildList(nsIFrame::kSelectPopupList).FirstChild();
if (childFrame) {
captureFrame = childFrame;
}
}
// scrollable frames should use the scrolling container as
// the root instead of the document
nsIScrollableFrame* scrollFrame = do_QueryFrame(captureFrame);
if (scrollFrame) {
frame = scrollFrame->GetScrolledFrame();
}
}
}
}
else {
ClearMouseCapture(nullptr);
capturingContent = nullptr;
}
}
// all touch events except for touchstart use a captured target
if (aEvent->mClass == eTouchEventClass &&
aEvent->message != NS_TOUCH_START) {
captureRetarget = true;
}
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
bool isWindowLevelMouseExit = (aEvent->message == NS_MOUSE_EXIT) &&
(mouseEvent && mouseEvent->exit == WidgetMouseEvent::eTopLevel);
// Get the frame at the event point. However, don't do this if we're
// capturing and retargeting the event because the captured frame will
// be used instead below. Also keep using the root frame if we're dealing
// with a window-level mouse exit event since we want to start sending
// mouse out events at the root EventStateManager.
if (!captureRetarget && !isWindowLevelMouseExit) {
nsPoint eventPoint;
uint32_t flags = 0;
if (aEvent->message == NS_TOUCH_START) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// if this is a continuing session, ensure that all these events are
// in the same document by taking the target of the events already in
// the capture list
nsCOMPtr<nsIContent> anyTarget;
if (gCaptureTouchList->Count() > 0 && touchEvent->touches.Length() > 1) {
gCaptureTouchList->Enumerate(&FindAnyTarget, &anyTarget);
} else {
gPreventMouseEvents = false;
}
for (int32_t i = touchEvent->touches.Length(); i; ) {
--i;
dom::Touch* touch = touchEvent->touches[i];
int32_t id = touch->Identifier();
if (!gCaptureTouchList->Get(id, nullptr)) {
// find the target for this touch
eventPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
touch->mRefPoint,
frame);
nsIFrame* target = FindFrameTargetedByInputEvent(aEvent,
frame,
eventPoint,
flags);
if (target && !anyTarget) {
target->GetContentForEvent(aEvent, getter_AddRefs(anyTarget));
while (anyTarget && !anyTarget->IsElement()) {
anyTarget = anyTarget->GetParent();
}
touch->SetTarget(anyTarget);
} else {
nsIFrame* newTargetFrame = nullptr;
for (nsIFrame* f = target; f;
f = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(f)) {
if (f->PresContext()->Document() == anyTarget->OwnerDoc()) {
newTargetFrame = f;
break;
}
// We must be in a subdocument so jump directly to the root frame.
// GetParentOrPlaceholderForCrossDoc gets called immediately to
// jump up to the containing document.
f = f->PresContext()->GetPresShell()->GetRootFrame();
}
// if we couldn't find a target frame in the same document as
// anyTarget, remove the touch from the capture touch list, as
// well as the event->touches array. touchmove events that aren't
// in the captured touch list will be discarded
if (!newTargetFrame) {
touchEvent->touches.RemoveElementAt(i);
} else {
target = newTargetFrame;
nsCOMPtr<nsIContent> targetContent;
target->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
while (targetContent && !targetContent->IsElement()) {
targetContent = targetContent->GetParent();
}
touch->SetTarget(targetContent);
}
}
if (target) {
frame = target;
}
} else {
// This touch is an old touch, we need to ensure that is not
// marked as changed and set its target correctly
touch->mChanged = false;
int32_t id = touch->Identifier();
nsRefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
if (oldTouch) {
touch->SetTarget(oldTouch->mTarget);
}
}
}
} else {
eventPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, frame);
}
if (mouseEvent && mouseEvent->mClass == eMouseEventClass &&
mouseEvent->ignoreRootScrollFrame) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
}
nsIFrame* target =
FindFrameTargetedByInputEvent(aEvent, frame, eventPoint, flags);
if (target) {
frame = target;
}
}
// if a node is capturing the mouse, check if the event needs to be
// retargeted at the capturing content instead. This will be the case when
// capture retargeting is being used, no frame was found or the frame's
// content is not a descendant of the capturing content.
if (capturingContent &&
(gCaptureInfo.mRetargetToElement || !frame->GetContent() ||
!nsContentUtils::ContentIsCrossDocDescendantOf(frame->GetContent(),
capturingContent))) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->GetCrossShadowCurrentDoc() == GetDocument(),
"Unexpected document");
nsIFrame* capturingFrame = capturingContent->GetPrimaryFrame();
if (capturingFrame) {
frame = capturingFrame;
}
}
if (aEvent->mClass == ePointerEventClass) {
if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
// Before any pointer events, we should check state of pointer capture,
// Thus got/lostpointercapture events emulate asynchronous behavior.
// Handlers of got/lostpointercapture events can change capturing state,
// That's why we should re-check pointer capture state until stable state.
while(CheckPointerCaptureState(pointerEvent->pointerId));
}
}
if (aEvent->mClass == ePointerEventClass &&
aEvent->message != NS_POINTER_DOWN) {
if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
uint32_t pointerId = pointerEvent->pointerId;
nsIContent* pointerCapturingContent = GetPointerCapturingContent(pointerId);
if (pointerCapturingContent) {
if (nsIFrame* capturingFrame = pointerCapturingContent->GetPrimaryFrame()) {
// If pointer capture is set, we should suppress pointerover/pointerenter events
// for all elements except element which have pointer capture. (Code in EventStateManager)
pointerEvent->retargetedByPointerCapture =
frame && frame->GetContent() &&
!nsContentUtils::ContentIsDescendantOf(frame->GetContent(), pointerCapturingContent);
frame = capturingFrame;
}
if (pointerEvent->message == NS_POINTER_UP ||
pointerEvent->message == NS_POINTER_CANCEL) {
// Implicitly releasing capture for given pointer.
// LOST_POINTER_CAPTURE should be send after NS_POINTER_UP or NS_POINTER_CANCEL.
releasePointerCaptureCaller.SetTarget(pointerId, pointerCapturingContent);
}
}
}
}
// Suppress mouse event if it's being targeted at an element inside
// a document which needs events suppressed
if (aEvent->mClass == eMouseEventClass &&
frame->PresContext()->Document()->EventHandlingSuppressed()) {
if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
mNoDelayedMouseEvents = true;
} else if (!mNoDelayedMouseEvents && aEvent->message == NS_MOUSE_BUTTON_UP) {
DelayedEvent* event = new DelayedMouseEvent(aEvent->AsMouseEvent());
if (!mDelayedEvents.AppendElement(event)) {
delete event;
}
}
return NS_OK;
}
PresShell* shell =
static_cast<PresShell*>(frame->PresContext()->PresShell());
switch (aEvent->message) {
case NS_TOUCH_MOVE:
case NS_TOUCH_CANCEL:
case NS_TOUCH_END: {
// get the correct shell to dispatch to
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
WidgetTouchEvent::TouchArray& touches = touchEvent->touches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
dom::Touch* touch = touches[i];
if (!touch) {
break;
}
nsRefPtr<dom::Touch> oldTouch =
gCaptureTouchList->GetWeak(touch->Identifier());
if (!oldTouch) {
break;
}
nsCOMPtr<nsIContent> content =
do_QueryInterface(oldTouch->GetTarget());
if (!content) {
break;
}
nsIFrame* contentFrame = content->GetPrimaryFrame();
if (!contentFrame) {
break;
}
shell = static_cast<PresShell*>(
contentFrame->PresContext()->PresShell());
if (shell) {
break;
}
}
break;
}
}
// Check if we have an active EventStateManager which isn't the
// EventStateManager of the current PresContext.
// If that is the case, and mouse is over some ancestor document,
// forward event handling to the active document.
// This way content can get mouse events even when
// mouse is over the chrome or outside the window.
//
// Note, currently for backwards compatibility we don't forward mouse events
// to the active document when mouse is over some subdocument.
EventStateManager* activeESM =
EventStateManager::GetActiveEventStateManager();
if (activeESM && aEvent->HasMouseEventMessage() &&
activeESM != shell->GetPresContext()->EventStateManager() &&
static_cast<EventStateManager*>(activeESM)->GetPresContext()) {
nsIPresShell* activeShell =
static_cast<EventStateManager*>(activeESM)->GetPresContext()->
GetPresShell();
if (activeShell &&
nsContentUtils::ContentIsCrossDocDescendantOf(activeShell->GetDocument(),
shell->GetDocument())) {
shell = static_cast<PresShell*>(activeShell);
frame = shell->GetRootFrame();
}
}
if (shell != this) {
// Handle the event in the correct shell.
// Prevent deletion until we're done with event handling (bug 336582).
nsCOMPtr<nsIPresShell> kungFuDeathGrip(shell);
// We pass the subshell's root frame as the frame to start from. This is
// the only correct alternative; if the event was captured then it
// must have been captured by us or some ancestor shell and we
// now ask the subshell to dispatch it normally.
return shell->HandlePositionedEvent(frame, aEvent, aEventStatus);
}
return HandlePositionedEvent(frame, aEvent, aEventStatus);
}
nsresult rv = NS_OK;
if (frame) {
PushCurrentEventInfo(nullptr, nullptr);
// key and IME related events go to the focused frame in this DOM window.
if (aEvent->IsTargetedAtFocusedContent()) {
mCurrentEventContent = nullptr;
nsCOMPtr<nsPIDOMWindow> window =
do_QueryInterface(mDocument->GetWindow());
nsCOMPtr<nsPIDOMWindow> focusedWindow;
nsCOMPtr<nsIContent> eventTarget =
nsFocusManager::GetFocusedDescendant(window, false,
getter_AddRefs(focusedWindow));
// otherwise, if there is no focused content or the focused content has
// no frame, just use the root content. This ensures that key events
// still get sent to the window properly if nothing is focused or if a
// frame goes away while it is focused.
if (!eventTarget || !eventTarget->GetPrimaryFrame()) {
nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
if (htmlDoc) {
nsCOMPtr<nsIDOMHTMLElement> body;
htmlDoc->GetBody(getter_AddRefs(body));
eventTarget = do_QueryInterface(body);
if (!eventTarget) {
eventTarget = mDocument->GetRootElement();
}
} else {
eventTarget = mDocument->GetRootElement();
}
}
if (aEvent->message == NS_KEY_DOWN) {
NS_IF_RELEASE(gKeyDownTarget);
NS_IF_ADDREF(gKeyDownTarget = eventTarget);
}
else if ((aEvent->message == NS_KEY_PRESS || aEvent->message == NS_KEY_UP) &&
gKeyDownTarget) {
// If a different element is now focused for the keypress/keyup event
// than what was focused during the keydown event, check if the new
// focused element is not in a chrome document any more, and if so,
// retarget the event back at the keydown target. This prevents a
// content area from grabbing the focus from chrome in-between key
// events.
if (eventTarget &&
nsContentUtils::IsChromeDoc(gKeyDownTarget->GetComposedDoc()) !=
nsContentUtils::IsChromeDoc(eventTarget->GetComposedDoc())) {
eventTarget = gKeyDownTarget;
}
if (aEvent->message == NS_KEY_UP) {
NS_RELEASE(gKeyDownTarget);
}
}
mCurrentEventFrame = nullptr;
nsIDocument* targetDoc = eventTarget ? eventTarget->OwnerDoc() : nullptr;
if (targetDoc && targetDoc != mDocument) {
PopCurrentEventInfo();
nsCOMPtr<nsIPresShell> shell = targetDoc->GetShell();
if (shell) {
rv = static_cast<PresShell*>(shell.get())->
HandleRetargetedEvent(aEvent, aEventStatus, eventTarget);
}
return rv;
} else {
mCurrentEventContent = eventTarget;
}
if (!GetCurrentEventContent() || !GetCurrentEventFrame() ||
InZombieDocument(mCurrentEventContent)) {
rv = RetargetEventToParent(aEvent, aEventStatus);
PopCurrentEventInfo();
return rv;
}
} else {
mCurrentEventFrame = frame;
}
if (GetCurrentEventFrame()) {
rv = HandleEventInternal(aEvent, aEventStatus);
}
#ifdef DEBUG
ShowEventTargetDebug();
#endif
PopCurrentEventInfo();
} else {
// Activation events need to be dispatched even if no frame was found, since
// we don't want the focus to be out of sync.
if (!NS_EVENT_NEEDS_FRAME(aEvent)) {
mCurrentEventFrame = nullptr;
return HandleEventInternal(aEvent, aEventStatus);
}
else if (aEvent->HasKeyEventMessage()) {
// Keypress events in new blank tabs should not be completely thrown away.
// Retarget them -- the parent chrome shell might make use of them.
return RetargetEventToParent(aEvent, aEventStatus);
}
}
return rv;
}
#ifdef ANDROID
nsIDocument*
PresShell::GetTouchEventTargetDocument()
{
nsPresContext* context = GetPresContext();
if (!context || !context->IsRoot()) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeItem> shellAsTreeItem = context->GetDocShell();
if (!shellAsTreeItem) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeOwner> owner;
shellAsTreeItem->GetTreeOwner(getter_AddRefs(owner));
if (!owner) {
return nullptr;
}
// now get the primary content shell (active tab)
nsCOMPtr<nsIDocShellTreeItem> item;
owner->GetPrimaryContentShell(getter_AddRefs(item));
nsCOMPtr<nsIDocShell> childDocShell = do_QueryInterface(item);
if (!childDocShell) {
return nullptr;
}
return childDocShell->GetDocument();
}
#endif
#ifdef DEBUG
void
PresShell::ShowEventTargetDebug()
{
if (nsFrame::GetShowEventTargetFrameBorder() &&
GetCurrentEventFrame()) {
if (mDrawEventTargetFrame) {
mDrawEventTargetFrame->InvalidateFrame();
}
mDrawEventTargetFrame = mCurrentEventFrame;
mDrawEventTargetFrame->InvalidateFrame();
}
}
#endif
nsresult
PresShell::HandlePositionedEvent(nsIFrame* aTargetFrame,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, nullptr);
mCurrentEventFrame = aTargetFrame;
if (mCurrentEventFrame) {
nsCOMPtr<nsIContent> targetElement;
mCurrentEventFrame->GetContentForEvent(aEvent,
getter_AddRefs(targetElement));
// If there is no content for this frame, target it anyway. Some
// frames can be targeted but do not have content, particularly
// windows with scrolling off.
if (targetElement) {
// Bug 103055, bug 185889: mouse events apply to *elements*, not all
// nodes. Thus we get the nearest element parent here.
// XXX we leave the frame the same even if we find an element
// parent, so that the text frame will receive the event (selection
// and friends are the ones who care about that anyway)
//
// We use weak pointers because during this tight loop, the node
// will *not* go away. And this happens on every mousemove.
while (targetElement && !targetElement->IsElement()) {
targetElement = targetElement->GetParent();
}
// If we found an element, target it. Otherwise, target *nothing*.
if (!targetElement) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
} else if (targetElement != mCurrentEventContent) {
mCurrentEventContent = targetElement;
}
}
}
if (GetCurrentEventFrame()) {
rv = HandleEventInternal(aEvent, aEventStatus);
}
#ifdef DEBUG
ShowEventTargetDebug();
#endif
PopCurrentEventInfo();
return rv;
}
nsresult
PresShell::HandleEventWithTarget(WidgetEvent* aEvent, nsIFrame* aFrame,
nsIContent* aContent, nsEventStatus* aStatus)
{
#if DEBUG
MOZ_ASSERT(!aFrame || aFrame->PresContext()->GetPresShell() == this,
"wrong shell");
if (aContent) {
nsIDocument* doc = aContent->GetCrossShadowCurrentDoc();
NS_ASSERTION(doc, "event for content that isn't in a document");
NS_ASSERTION(!doc || doc->GetShell() == this, "wrong shell");
}
#endif
NS_ENSURE_STATE(!aContent || aContent->GetCrossShadowCurrentDoc() == mDocument);
PushCurrentEventInfo(aFrame, aContent);
nsresult rv = HandleEventInternal(aEvent, aStatus);
PopCurrentEventInfo();
return rv;
}
nsresult
PresShell::HandleEventInternal(WidgetEvent* aEvent, nsEventStatus* aStatus)
{
nsRefPtr<EventStateManager> manager = mPresContext->EventStateManager();
nsresult rv = NS_OK;
if (!NS_EVENT_NEEDS_FRAME(aEvent) || GetCurrentEventFrame()) {
bool touchIsNew = false;
bool isHandlingUserInput = false;
// XXX How about IME events and input events for plugins?
if (aEvent->mFlags.mIsTrusted) {
switch (aEvent->message) {
case NS_KEY_PRESS:
case NS_KEY_DOWN:
case NS_KEY_UP: {
nsIDocument* doc = GetCurrentEventContent() ?
mCurrentEventContent->OwnerDoc() : nullptr;
nsIDocument* fullscreenAncestor = nullptr;
if (aEvent->AsKeyboardEvent()->keyCode == NS_VK_ESCAPE) {
if ((fullscreenAncestor = nsContentUtils::GetFullscreenAncestor(doc))) {
// Prevent default action on ESC key press when exiting
// DOM fullscreen mode. This prevents the browser ESC key
// handler from stopping all loads in the document, which
// would cause <video> loads to stop.
aEvent->mFlags.mDefaultPrevented = true;
aEvent->mFlags.mOnlyChromeDispatch = true;
if (aEvent->message == NS_KEY_UP) {
// ESC key released while in DOM fullscreen mode.
// If fullscreen is running in content-only mode, exit the target
// doctree branch from fullscreen, otherwise fully exit all
// browser windows and documents from fullscreen mode.
// Note: in the content-only fullscreen case, we pass the
// fullscreenAncestor since |doc| may not actually be fullscreen
// here, and ExitFullscreen() has no affect when passed a
// non-fullscreen document.
nsIDocument::ExitFullscreen(
nsContentUtils::IsFullscreenApiContentOnly() ? fullscreenAncestor : nullptr,
/* async */ true);
}
}
nsCOMPtr<nsIDocument> pointerLockedDoc =
do_QueryReferent(EventStateManager::sPointerLockedDoc);
if (pointerLockedDoc) {
aEvent->mFlags.mDefaultPrevented = true;
aEvent->mFlags.mOnlyChromeDispatch = true;
if (aEvent->message == NS_KEY_UP) {
nsIDocument::UnlockPointer();
}
}
}
// Else not full-screen mode or key code is unrestricted, fall
// through to normal handling.
}
case NS_MOUSE_BUTTON_DOWN:
case NS_MOUSE_BUTTON_UP:
isHandlingUserInput = true;
break;
case NS_TOUCH_START: {
isHandlingUserInput = true;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// if there is only one touch in this touchstart event, assume that it is
// the start of a new touch session and evict any old touches in the
// queue
if (touchEvent->touches.Length() == 1) {
WidgetTouchEvent::AutoTouchArray touches;
gCaptureTouchList->Enumerate(&AppendToTouchList, (void *)&touches);
for (uint32_t i = 0; i < touches.Length(); ++i) {
EvictTouchPoint(touches[i]);
}
}
// Add any new touches to the queue
for (uint32_t i = 0; i < touchEvent->touches.Length(); ++i) {
dom::Touch* touch = touchEvent->touches[i];
int32_t id = touch->Identifier();
if (!gCaptureTouchList->Get(id, nullptr)) {
// If it is not already in the queue, it is a new touch
touch->mChanged = true;
}
touch->mMessage = aEvent->message;
gCaptureTouchList->Put(id, touch);
}
break;
}
case NS_TOUCH_END:
isHandlingUserInput = true;
// Fall through to touchcancel code
case NS_TOUCH_CANCEL: {
// Remove the changed touches
// need to make sure we only remove touches that are ending here
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
WidgetTouchEvent::TouchArray& touches = touchEvent->touches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
dom::Touch* touch = touches[i];
if (!touch) {
continue;
}
touch->mMessage = aEvent->message;
touch->mChanged = true;
int32_t id = touch->Identifier();
nsRefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
if (!oldTouch) {
continue;
}
nsCOMPtr<EventTarget> targetPtr = oldTouch->mTarget;
mCurrentEventContent = do_QueryInterface(targetPtr);
touch->SetTarget(targetPtr);
gCaptureTouchList->Remove(id);
}
// add any touches left in the touch list, but ensure changed=false
gCaptureTouchList->Enumerate(&AppendToTouchList, (void *)&touches);
break;
}
case NS_TOUCH_MOVE: {
// Check for touches that changed. Mark them add to queue
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
WidgetTouchEvent::TouchArray& touches = touchEvent->touches;
bool haveChanged = false;
for (int32_t i = touches.Length(); i; ) {
--i;
dom::Touch* touch = touches[i];
if (!touch) {
continue;
}
int32_t id = touch->Identifier();
touch->mMessage = aEvent->message;
nsRefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
if (!oldTouch) {
touches.RemoveElementAt(i);
continue;
}
if (!touch->Equals(oldTouch)) {
touch->mChanged = true;
haveChanged = true;
}
nsCOMPtr<dom::EventTarget> targetPtr = oldTouch->mTarget;
if (!targetPtr) {
touches.RemoveElementAt(i);
continue;
}
touch->SetTarget(targetPtr);
gCaptureTouchList->Put(id, touch);
// if we're moving from touchstart to touchmove for this touch
// we allow preventDefault to prevent mouse events
if (oldTouch->mMessage != touch->mMessage) {
touchIsNew = true;
}
}
// is nothing has changed, we should just return
if (!haveChanged) {
if (touchIsNew) {
// however, if this is the first touchmove after a touchstart,
// it is special in that preventDefault is allowed on it, so
// we must dispatch it to content even if nothing changed. we
// arbitrarily pick the first touch point to be the "changed"
// touch because firing an event with no changed events doesn't
// work.
for (uint32_t i = 0; i < touchEvent->touches.Length(); ++i) {
if (touchEvent->touches[i]) {
touchEvent->touches[i]->mChanged = true;
break;
}
}
} else {
if (gPreventMouseEvents) {
*aStatus = nsEventStatus_eConsumeNoDefault;
}
return NS_OK;
}
}
break;
}
case NS_DRAGDROP_DROP:
nsCOMPtr<nsIDragSession> session = nsContentUtils::GetDragSession();
if (session) {
bool onlyChromeDrop = false;
session->GetOnlyChromeDrop(&onlyChromeDrop);
if (onlyChromeDrop) {
aEvent->mFlags.mOnlyChromeDispatch = true;
}
}
break;
}
}
if (aEvent->message == NS_CONTEXTMENU) {
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent->context == WidgetMouseEvent::eContextMenuKey &&
!AdjustContextMenuKeyEvent(mouseEvent)) {
return NS_OK;
}
if (mouseEvent->IsShift()) {
aEvent->mFlags.mOnlyChromeDispatch = true;
aEvent->mFlags.mRetargetToNonNativeAnonymous = true;
}
}
AutoHandlingUserInputStatePusher userInpStatePusher(isHandlingUserInput,
aEvent, mDocument);
if (aEvent->mFlags.mIsTrusted && aEvent->message == NS_MOUSE_MOVE) {
nsIPresShell::AllowMouseCapture(
EventStateManager::GetActiveEventStateManager() == manager);
}
nsAutoPopupStatePusher popupStatePusher(
Event::GetEventPopupControlState(aEvent));
// FIXME. If the event was reused, we need to clear the old target,
// bug 329430
aEvent->target = nullptr;
// 1. Give event to event manager for pre event state changes and
// generation of synthetic events.
rv = manager->PreHandleEvent(mPresContext, aEvent, mCurrentEventFrame, aStatus);
// 2. Give event to the DOM for third party and JS use.
if (NS_SUCCEEDED(rv)) {
bool wasHandlingKeyBoardEvent =
nsContentUtils::IsHandlingKeyBoardEvent();
if (aEvent->mClass == eKeyboardEventClass) {
nsContentUtils::SetIsHandlingKeyBoardEvent(true);
}
if (aEvent->IsAllowedToDispatchDOMEvent()) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript(),
"Somebody changed aEvent to cause a DOM event!");
nsPresShellEventCB eventCB(this);
if (aEvent->mClass == eTouchEventClass) {
DispatchTouchEvent(aEvent, aStatus, &eventCB, touchIsNew);
} else {
nsCOMPtr<nsINode> eventTarget = mCurrentEventContent.get();
nsPresShellEventCB* eventCBPtr = &eventCB;
if (!eventTarget) {
nsCOMPtr<nsIContent> targetContent;
if (mCurrentEventFrame) {
rv = mCurrentEventFrame->
GetContentForEvent(aEvent, getter_AddRefs(targetContent));
}
if (NS_SUCCEEDED(rv) && targetContent) {
eventTarget = do_QueryInterface(targetContent);
} else if (mDocument) {
eventTarget = do_QueryInterface(mDocument);
// If we don't have any content, the callback wouldn't probably
// do nothing.
eventCBPtr = nullptr;
}
}
if (eventTarget) {
if (aEvent->mClass == eCompositionEventClass) {
IMEStateManager::DispatchCompositionEvent(eventTarget,
mPresContext, aEvent->AsCompositionEvent(), aStatus,
eventCBPtr);
} else if (aEvent->mClass == eKeyboardEventClass) {
HandleKeyboardEvent(eventTarget, *(aEvent->AsKeyboardEvent()),
false, aStatus, eventCBPtr);
} else {
EventDispatcher::Dispatch(eventTarget, mPresContext,
aEvent, nullptr, aStatus, eventCBPtr);
}
}
}
}
nsContentUtils::SetIsHandlingKeyBoardEvent(wasHandlingKeyBoardEvent);
// 3. Give event to event manager for post event state changes and
// generation of synthetic events.
if (!mIsDestroying && NS_SUCCEEDED(rv)) {
rv = manager->PostHandleEvent(mPresContext, aEvent,
GetCurrentEventFrame(), aStatus);
}
}
if (aEvent->message == NS_MOUSE_BUTTON_UP) {
// reset the capturing content now that the mouse button is up
SetCapturingContent(nullptr, 0);
} else if (aEvent->message == NS_MOUSE_MOVE) {
nsIPresShell::AllowMouseCapture(false);
}
}
return rv;
}
void
nsIPresShell::DispatchGotOrLostPointerCaptureEvent(bool aIsGotCapture,
uint32_t aPointerId,
uint16_t aPointerType,
bool aIsPrimary,
nsIContent* aCaptureTarget)
{
PointerEventInit init;
init.mPointerId = aPointerId;
init.mBubbles = true;
ConvertPointerTypeToString(aPointerType, init.mPointerType);
init.mIsPrimary = aIsPrimary;
nsRefPtr<mozilla::dom::PointerEvent> event;
event = PointerEvent::Constructor(aCaptureTarget,
aIsGotCapture
? NS_LITERAL_STRING("gotpointercapture")
: NS_LITERAL_STRING("lostpointercapture"),
init);
if (event) {
bool dummy;
// If the capturing element was removed from the DOM tree,
// lostpointercapture event should be fired at the document.
if (!aIsGotCapture && !aCaptureTarget->IsInDoc()) {
aCaptureTarget->OwnerDoc()->DispatchEvent(event->InternalDOMEvent(), &dummy);
} else {
aCaptureTarget->DispatchEvent(event->InternalDOMEvent(), &dummy);
}
}
}
void
PresShell::DispatchTouchEvent(WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB,
bool aTouchIsNew)
{
// calling preventDefault on touchstart or the first touchmove for a
// point prevents mouse events. calling it on the touchend should
// prevent click dispatching.
bool canPrevent = (aEvent->message == NS_TOUCH_START) ||
(aEvent->message == NS_TOUCH_MOVE && aTouchIsNew) ||
(aEvent->message == NS_TOUCH_END);
bool preventDefault = false;
nsEventStatus tmpStatus = nsEventStatus_eIgnore;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// loop over all touches and dispatch events on any that have changed
for (uint32_t i = 0; i < touchEvent->touches.Length(); ++i) {
dom::Touch* touch = touchEvent->touches[i];
if (!touch || !touch->mChanged) {
continue;
}
nsCOMPtr<EventTarget> targetPtr = touch->mTarget;
nsCOMPtr<nsIContent> content = do_QueryInterface(targetPtr);
if (!content) {
continue;
}
nsIDocument* doc = content->OwnerDoc();
nsIContent* capturingContent = GetCapturingContent();
if (capturingContent) {
if (capturingContent->OwnerDoc() != doc) {
// Wrong document, don't dispatch anything.
continue;
}
content = capturingContent;
}
// copy the event
WidgetTouchEvent newEvent(touchEvent->mFlags.mIsTrusted,
touchEvent->message, touchEvent->widget);
newEvent.AssignTouchEventData(*touchEvent, false);
newEvent.target = targetPtr;
nsRefPtr<PresShell> contentPresShell;
if (doc == mDocument) {
contentPresShell = static_cast<PresShell*>(doc->GetShell());
if (contentPresShell) {
//XXXsmaug huge hack. Pushing possibly capturing content,
// even though event target is something else.
contentPresShell->PushCurrentEventInfo(
content->GetPrimaryFrame(), content);
}
}
nsIPresShell *presShell = doc->GetShell();
if (!presShell) {
continue;
}
nsPresContext *context = presShell->GetPresContext();
tmpStatus = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetPtr, context,
&newEvent, nullptr, &tmpStatus, aEventCB);
if (nsEventStatus_eConsumeNoDefault == tmpStatus ||
newEvent.mFlags.mMultipleActionsPrevented) {
preventDefault = true;
}
if (newEvent.mFlags.mMultipleActionsPrevented) {
touchEvent->mFlags.mMultipleActionsPrevented = true;
}
if (contentPresShell) {
contentPresShell->PopCurrentEventInfo();
}
}
// if preventDefault was called on any of the events dispatched
// and this is touchstart, or the first touchmove, widget should consume
// other events that would be associated with this touch session
if (preventDefault && canPrevent) {
gPreventMouseEvents = true;
}
if (gPreventMouseEvents) {
*aStatus = nsEventStatus_eConsumeNoDefault;
} else {
*aStatus = nsEventStatus_eIgnore;
}
}
// Dispatch event to content only (NOT full processing)
// See also HandleEventWithTarget which does full event processing.
nsresult
PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
WidgetEvent* aEvent,
nsEventStatus* aStatus)
{
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, aTargetContent);
// Bug 41013: Check if the event should be dispatched to content.
// It's possible that we are in the middle of destroying the window
// and the js context is out of date. This check detects the case
// that caused a crash in bug 41013, but there may be a better way
// to handle this situation!
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (container) {
// Dispatch event to content
rv = EventDispatcher::Dispatch(aTargetContent, mPresContext, aEvent,
nullptr, aStatus);
}
PopCurrentEventInfo();
return rv;
}
// See the method above.
nsresult
PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsIDOMEvent* aEvent,
nsEventStatus* aStatus)
{
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, aTargetContent);
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (container) {
rv = EventDispatcher::DispatchDOMEvent(aTargetContent, nullptr, aEvent,
mPresContext, aStatus);
}
PopCurrentEventInfo();
return rv;
}
bool
PresShell::AdjustContextMenuKeyEvent(WidgetMouseEvent* aEvent)
{
#ifdef MOZ_XUL
// if a menu is open, open the context menu relative to the active item on the menu.
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
nsIFrame* popupFrame = pm->GetTopPopup(ePopupTypeMenu);
if (popupFrame) {
nsIFrame* itemFrame =
(static_cast<nsMenuPopupFrame *>(popupFrame))->GetCurrentMenuItem();
if (!itemFrame)
itemFrame = popupFrame;
nsCOMPtr<nsIWidget> widget = popupFrame->GetNearestWidget();
aEvent->widget = widget;
nsIntPoint widgetPoint = widget->WidgetToScreenOffset();
aEvent->refPoint = LayoutDeviceIntPoint::FromUntyped(
itemFrame->GetScreenRect().BottomLeft() - widgetPoint);
mCurrentEventContent = itemFrame->GetContent();
mCurrentEventFrame = itemFrame;
return true;
}
}
#endif
// If we're here because of the key-equiv for showing context menus, we
// have to twiddle with the NS event to make sure the context menu comes
// up in the upper left of the relevant content area before we create
// the DOM event. Since we never call InitMouseEvent() on the event,
// the client X/Y will be 0,0. We can make use of that if the widget is null.
// Use the root view manager's widget since it's most likely to have one,
// and the coordinates returned by GetCurrentItemAndPositionForElement
// are relative to the widget of the root of the root view manager.
nsRootPresContext* rootPC = mPresContext->GetRootPresContext();
aEvent->refPoint.x = 0;
aEvent->refPoint.y = 0;
if (rootPC) {
rootPC->PresShell()->GetViewManager()->
GetRootWidget(getter_AddRefs(aEvent->widget));
if (aEvent->widget) {
// default the refpoint to the topleft of our document
nsPoint offset(0, 0);
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
nsView* view = rootFrame->GetClosestView(&offset);
offset += view->GetOffsetToWidget(aEvent->widget);
aEvent->refPoint =
LayoutDeviceIntPoint::FromAppUnitsToNearest(offset, mPresContext->AppUnitsPerDevPixel());
}
}
} else {
aEvent->widget = nullptr;
}
// see if we should use the caret position for the popup
nsIntPoint caretPoint;
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
if (PrepareToUseCaretPosition(aEvent->widget, caretPoint)) {
// caret position is good
aEvent->refPoint = LayoutDeviceIntPoint::FromUntyped(caretPoint);
return true;
}
// If we're here because of the key-equiv for showing context menus, we
// have to reset the event target to the currently focused element. Get it
// from the focus controller.
nsCOMPtr<nsIDOMElement> currentFocus;
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm)
fm->GetFocusedElement(getter_AddRefs(currentFocus));
// Reset event coordinates relative to focused frame in view
if (currentFocus) {
nsCOMPtr<nsIContent> currentPointElement;
GetCurrentItemAndPositionForElement(currentFocus,
getter_AddRefs(currentPointElement),
aEvent->refPoint,
aEvent->widget);
if (currentPointElement) {
mCurrentEventContent = currentPointElement;
mCurrentEventFrame = nullptr;
GetCurrentEventFrame();
}
}
return true;
}
// PresShell::PrepareToUseCaretPosition
//
// This checks to see if we should use the caret position for popup context
// menus. Returns true if the caret position should be used, and the
// coordinates of that position is returned in aTargetPt. This function
// will also scroll the window as needed to make the caret visible.
//
// The event widget should be the widget that generated the event, and
// whose coordinate system the resulting event's refPoint should be
// relative to. The returned point is in device pixels realtive to the
// widget passed in.
bool
PresShell::PrepareToUseCaretPosition(nsIWidget* aEventWidget, nsIntPoint& aTargetPt)
{
nsresult rv;
// check caret visibility
nsRefPtr<nsCaret> caret = GetCaret();
NS_ENSURE_TRUE(caret, false);
bool caretVisible = caret->IsVisible();
if (!caretVisible)
return false;
// caret selection, this is a temporary weak reference, so no refcounting is
// needed
nsISelection* domSelection = caret->GetSelection();
NS_ENSURE_TRUE(domSelection, false);
// since the match could be an anonymous textnode inside a
// <textarea> or text <input>, we need to get the outer frame
// note: frames are not refcounted
nsIFrame* frame = nullptr; // may be nullptr
nsCOMPtr<nsIDOMNode> node;
rv = domSelection->GetFocusNode(getter_AddRefs(node));
NS_ENSURE_SUCCESS(rv, false);
NS_ENSURE_TRUE(node, false);
nsCOMPtr<nsIContent> content(do_QueryInterface(node));
if (content) {
nsIContent* nonNative = content->FindFirstNonChromeOnlyAccessContent();
content = nonNative;
}
if (content) {
// It seems like ScrollSelectionIntoView should be enough, but it's
// not. The problem is that scrolling the selection into view when it is
// below the current viewport will align the top line of the frame exactly
// with the bottom of the window. This is fine, BUT, the popup event causes
// the control to be re-focused which does this exact call to
// ScrollContentIntoView, which has a one-pixel disagreement of whether the
// frame is actually in view. The result is that the frame is aligned with
// the top of the window, but the menu is still at the bottom.
//
// Doing this call first forces the frame to be in view, eliminating the
// problem. The only difference in the result is that if your cursor is in
// an edit box below the current view, you'll get the edit box aligned with
// the top of the window. This is arguably better behavior anyway.
rv = ScrollContentIntoView(content,
nsIPresShell::ScrollAxis(
nsIPresShell::SCROLL_MINIMUM,
nsIPresShell::SCROLL_IF_NOT_VISIBLE),
nsIPresShell::ScrollAxis(
nsIPresShell::SCROLL_MINIMUM,
nsIPresShell::SCROLL_IF_NOT_VISIBLE),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
NS_ENSURE_SUCCESS(rv, false);
frame = content->GetPrimaryFrame();
NS_WARN_IF_FALSE(frame, "No frame for focused content?");
}
// Actually scroll the selection (ie caret) into view. Note that this must
// be synchronous since we will be checking the caret position on the screen.
//
// Be easy about errors, and just don't scroll in those cases. Better to have
// the correct menu at a weird place than the wrong menu.
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
nsCOMPtr<nsISelectionController> selCon;
if (frame)
frame->GetSelectionController(GetPresContext(), getter_AddRefs(selCon));
else
selCon = static_cast<nsISelectionController *>(this);
if (selCon) {
rv = selCon->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS);
NS_ENSURE_SUCCESS(rv, false);
}
nsPresContext* presContext = GetPresContext();
// get caret position relative to the closest view
nsRect caretCoords;
nsIFrame* caretFrame = caret->GetGeometry(&caretCoords);
if (!caretFrame)
return false;
nsPoint viewOffset;
nsView* view = caretFrame->GetClosestView(&viewOffset);
if (!view)
return false;
// and then get the caret coords relative to the event widget
if (aEventWidget) {
viewOffset += view->GetOffsetToWidget(aEventWidget);
}
caretCoords.MoveBy(viewOffset);
// caret coordinates are in app units, convert to pixels
aTargetPt.x =
presContext->AppUnitsToDevPixels(caretCoords.x + caretCoords.width);
aTargetPt.y =
presContext->AppUnitsToDevPixels(caretCoords.y + caretCoords.height);
// make sure rounding doesn't return a pixel which is outside the caret
// (e.g. one line lower)
aTargetPt.y -= 1;
return true;
}
void
PresShell::GetCurrentItemAndPositionForElement(nsIDOMElement *aCurrentEl,
nsIContent** aTargetToUse,
LayoutDeviceIntPoint& aTargetPt,
nsIWidget *aRootWidget)
{
nsCOMPtr<nsIContent> focusedContent(do_QueryInterface(aCurrentEl));
ScrollContentIntoView(focusedContent,
ScrollAxis(),
ScrollAxis(),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
nsPresContext* presContext = GetPresContext();
bool istree = false, checkLineHeight = true;
nscoord extraTreeY = 0;
#ifdef MOZ_XUL
// Set the position to just underneath the current item for multi-select
// lists or just underneath the selected item for single-select lists. If
// the element is not a list, or there is no selection, leave the position
// as is.
nsCOMPtr<nsIDOMXULSelectControlItemElement> item;
nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelect =
do_QueryInterface(aCurrentEl);
if (multiSelect) {
checkLineHeight = false;
int32_t currentIndex;
multiSelect->GetCurrentIndex(&currentIndex);
if (currentIndex >= 0) {
nsCOMPtr<nsIDOMXULElement> xulElement(do_QueryInterface(aCurrentEl));
if (xulElement) {
nsCOMPtr<nsIBoxObject> box;
xulElement->GetBoxObject(getter_AddRefs(box));
nsCOMPtr<nsITreeBoxObject> treeBox(do_QueryInterface(box));
// Tree view special case (tree items have no frames)
// Get the focused row and add its coordinates, which are already in pixels
// XXX Boris, should we create a new interface so that this doesn't
// need to know about trees? Something like nsINodelessChildCreator which
// could provide the current focus coordinates?
if (treeBox) {
treeBox->EnsureRowIsVisible(currentIndex);
int32_t firstVisibleRow, rowHeight;
treeBox->GetFirstVisibleRow(&firstVisibleRow);
treeBox->GetRowHeight(&rowHeight);
extraTreeY += presContext->CSSPixelsToAppUnits(
(currentIndex - firstVisibleRow + 1) * rowHeight);
istree = true;
nsCOMPtr<nsITreeColumns> cols;
treeBox->GetColumns(getter_AddRefs(cols));
if (cols) {
nsCOMPtr<nsITreeColumn> col;
cols->GetFirstColumn(getter_AddRefs(col));
if (col) {
nsCOMPtr<nsIDOMElement> colElement;
col->GetElement(getter_AddRefs(colElement));
nsCOMPtr<nsIContent> colContent(do_QueryInterface(colElement));
if (colContent) {
nsIFrame* frame = colContent->GetPrimaryFrame();
if (frame) {
extraTreeY += frame->GetSize().height;
}
}
}
}
}
else {
multiSelect->GetCurrentItem(getter_AddRefs(item));
}
}
}
}
else {
// don't check menulists as the selected item will be inside a popup.
nsCOMPtr<nsIDOMXULMenuListElement> menulist = do_QueryInterface(aCurrentEl);
if (!menulist) {
nsCOMPtr<nsIDOMXULSelectControlElement> select =
do_QueryInterface(aCurrentEl);
if (select) {
checkLineHeight = false;
select->GetSelectedItem(getter_AddRefs(item));
}
}
}
if (item)
focusedContent = do_QueryInterface(item);
#endif
nsIFrame *frame = focusedContent->GetPrimaryFrame();
if (frame) {
NS_ASSERTION(frame->PresContext() == GetPresContext(),
"handling event for focused content that is not in our document?");
nsPoint frameOrigin(0, 0);
// Get the frame's origin within its view
nsView *view = frame->GetClosestView(&frameOrigin);
NS_ASSERTION(view, "No view for frame");
// View's origin relative the widget
if (aRootWidget) {
frameOrigin += view->GetOffsetToWidget(aRootWidget);
}
// Start context menu down and to the right from top left of frame
// use the lineheight. This is a good distance to move the context
// menu away from the top left corner of the frame. If we always
// used the frame height, the context menu could end up far away,
// for example when we're focused on linked images.
// On the other hand, we want to use the frame height if it's less
// than the current line height, so that the context menu appears
// associated with the correct frame.
nscoord extra = 0;
if (!istree) {
extra = frame->GetSize().height;
if (checkLineHeight) {
nsIScrollableFrame *scrollFrame =
nsLayoutUtils::GetNearestScrollableFrame(frame);
if (scrollFrame) {
nsSize scrollAmount = scrollFrame->GetLineScrollAmount();
nsIFrame* f = do_QueryFrame(scrollFrame);
int32_t APD = presContext->AppUnitsPerDevPixel();
int32_t scrollAPD = f->PresContext()->AppUnitsPerDevPixel();
scrollAmount = scrollAmount.ConvertAppUnits(scrollAPD, APD);
if (extra > scrollAmount.height) {
extra = scrollAmount.height;
}
}
}
}
aTargetPt.x = presContext->AppUnitsToDevPixels(frameOrigin.x);
aTargetPt.y = presContext->AppUnitsToDevPixels(
frameOrigin.y + extra + extraTreeY);
}
NS_IF_ADDREF(*aTargetToUse = focusedContent);
}
bool
PresShell::ShouldIgnoreInvalidation()
{
return mPaintingSuppressed || !mIsActive || mIsNeverPainting;
}
void
PresShell::WillPaint()
{
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (!rootPresContext) {
// In some edge cases, such as when we don't have a root frame yet,
// we can't find the root prescontext. There's nothing to do in that
// case.
return;
}
// Don't bother doing anything if some viewmanager in our tree is painting
// while we still have painting suppressed or we are not active.
if (mPaintingSuppressed || !mIsActive || !IsVisible()) {
return;
}
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying)
return;
// Process reflows, if we have them, to reduce flicker due to invalidates and
// reflow being interspersed. Note that we _do_ allow this to be
// interruptible; if we can't do all the reflows it's better to flicker a bit
// than to freeze up.
FlushPendingNotifications(ChangesToFlush(Flush_InterruptibleLayout, false));
}
void
PresShell::WillPaintWindow()
{
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext != mPresContext) {
// This could be a popup's presshell. We don't allow plugins in popups
// so there's nothing to do here.
return;
}
#ifndef XP_MACOSX
rootPresContext->ApplyPluginGeometryUpdates();
#endif
}
void
PresShell::DidPaintWindow()
{
if (mDocument) {
nsCOMPtr<nsPIDOMWindow> window = mDocument->GetWindow();
if (window) {
window->SendAfterRemotePaintIfRequested();
}
}
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext != mPresContext) {
// This could be a popup's presshell. No point in notifying XPConnect
// about compositing of popups.
return;
}
}
bool
PresShell::IsVisible()
{
if (!mViewManager)
return false;
nsView* view = mViewManager->GetRootView();
if (!view)
return true;
// inner view of subdoc frame
view = view->GetParent();
if (!view)
return mIsActive;
// subdoc view
view = view->GetParent();
if (!view)
return true;
nsIFrame* frame = view->GetFrame();
if (!frame)
return true;
return frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY);
}
nsresult
PresShell::GetAgentStyleSheets(nsCOMArray<nsIStyleSheet>& aSheets)
{
aSheets.Clear();
int32_t sheetCount = mStyleSet->SheetCount(nsStyleSet::eAgentSheet);
for (int32_t i = 0; i < sheetCount; ++i) {
nsIStyleSheet *sheet = mStyleSet->StyleSheetAt(nsStyleSet::eAgentSheet, i);
if (!aSheets.AppendObject(sheet))
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
nsresult
PresShell::SetAgentStyleSheets(const nsCOMArray<nsIStyleSheet>& aSheets)
{
return mStyleSet->ReplaceSheets(nsStyleSet::eAgentSheet, aSheets);
}
nsresult
PresShell::AddOverrideStyleSheet(nsIStyleSheet *aSheet)
{
return mStyleSet->PrependStyleSheet(nsStyleSet::eOverrideSheet, aSheet);
}
nsresult
PresShell::RemoveOverrideStyleSheet(nsIStyleSheet *aSheet)
{
return mStyleSet->RemoveStyleSheet(nsStyleSet::eOverrideSheet, aSheet);
}
static void
FreezeElement(nsISupports *aSupports, void * /* unused */)
{
nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(aSupports));
if (olc) {
olc->StopPluginInstance();
}
}
static bool
FreezeSubDocument(nsIDocument *aDocument, void *aData)
{
nsIPresShell *shell = aDocument->GetShell();
if (shell)
shell->Freeze();
return true;
}
void
PresShell::Freeze()
{
mUpdateImageVisibilityEvent.Revoke();
MaybeReleaseCapturingContent();
mDocument->EnumerateActivityObservers(FreezeElement, nullptr);
if (mCaret) {
SetCaretEnabled(false);
}
mPaintingSuppressed = true;
if (mDocument) {
mDocument->EnumerateSubDocuments(FreezeSubDocument, nullptr);
}
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->PresContext() == presContext) {
presContext->RefreshDriver()->Freeze();
}
mFrozen = true;
if (mDocument) {
UpdateImageLockingState();
}
}
void
PresShell::FireOrClearDelayedEvents(bool aFireEvents)
{
mNoDelayedMouseEvents = false;
mNoDelayedKeyEvents = false;
if (!aFireEvents) {
mDelayedEvents.Clear();
return;
}
if (mDocument) {
nsCOMPtr<nsIDocument> doc = mDocument;
while (!mIsDestroying && mDelayedEvents.Length() &&
!doc->EventHandlingSuppressed()) {
nsAutoPtr<DelayedEvent> ev(mDelayedEvents[0].forget());
mDelayedEvents.RemoveElementAt(0);
ev->Dispatch();
}
if (!doc->EventHandlingSuppressed()) {
mDelayedEvents.Clear();
}
}
}
static void
ThawElement(nsISupports *aSupports, void *aShell)
{
nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(aSupports));
if (olc) {
olc->AsyncStartPluginInstance();
}
}
static bool
ThawSubDocument(nsIDocument *aDocument, void *aData)
{
nsIPresShell *shell = aDocument->GetShell();
if (shell)
shell->Thaw();
return true;
}
void
PresShell::Thaw()
{
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->PresContext() == presContext) {
presContext->RefreshDriver()->Thaw();
}
mDocument->EnumerateActivityObservers(ThawElement, this);
if (mDocument)
mDocument->EnumerateSubDocuments(ThawSubDocument, nullptr);
// Get the activeness of our presshell, as this might have changed
// while we were in the bfcache
QueryIsActive();
// We're now unfrozen
mFrozen = false;
UpdateImageLockingState();
UnsuppressPainting();
}
//--------------------------------------------------------
// Start of protected and private methods on the PresShell
//--------------------------------------------------------
void
PresShell::MaybeScheduleReflow()
{
ASSERT_REFLOW_SCHEDULED_STATE();
if (mReflowScheduled || mIsDestroying || mIsReflowing ||
mDirtyRoots.Length() == 0)
return;
if (!mPresContext->HasPendingInterrupt() || !ScheduleReflowOffTimer()) {
ScheduleReflow();
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
void
PresShell::ScheduleReflow()
{
NS_PRECONDITION(!mReflowScheduled, "Why are we trying to schedule a reflow?");
ASSERT_REFLOW_SCHEDULED_STATE();
if (GetPresContext()->RefreshDriver()->AddLayoutFlushObserver(this)) {
mReflowScheduled = true;
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
nsresult
PresShell::DidCauseReflow()
{
NS_ASSERTION(mChangeNestCount != 0, "Unexpected call to DidCauseReflow()");
--mChangeNestCount;
nsContentUtils::RemoveScriptBlocker();
return NS_OK;
}
void
PresShell::WillDoReflow()
{
mPresContext->FlushUserFontSet();
mPresContext->FlushCounterStyles();
mFrameConstructor->BeginUpdate();
mLastReflowStart = GetPerformanceNow();
}
void
PresShell::DidDoReflow(bool aInterruptible, bool aWasInterrupted)
{
mFrameConstructor->EndUpdate();
HandlePostedReflowCallbacks(aInterruptible);
nsCOMPtr<nsIDocShell> docShell = mPresContext->GetDocShell();
if (docShell) {
DOMHighResTimeStamp now = GetPerformanceNow();
docShell->NotifyReflowObservers(aInterruptible, mLastReflowStart, now);
}
if (sSynthMouseMove) {
SynthesizeMouseMove(false);
}
if (mTouchCaret) {
mTouchCaret->UpdatePositionIfNeeded();
}
if (!aWasInterrupted) {
ClearReflowOnZoomPending();
}
}
DOMHighResTimeStamp
PresShell::GetPerformanceNow()
{
DOMHighResTimeStamp now = 0;
nsPIDOMWindow* window = mDocument->GetInnerWindow();
if (window) {
nsPerformance* perf = window->GetPerformance();
if (perf) {
now = perf->Now();
}
}
return now;
}
static PLDHashOperator
MarkFramesDirtyToRoot(nsPtrHashKey<nsIFrame>* p, void* closure)
{
nsIFrame* target = static_cast<nsIFrame*>(closure);
for (nsIFrame* f = p->GetKey(); f && !NS_SUBTREE_DIRTY(f);
f = f->GetParent()) {
f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
if (f == target) {
break;
}
}
return PL_DHASH_NEXT;
}
void
PresShell::sReflowContinueCallback(nsITimer* aTimer, void* aPresShell)
{
nsRefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
NS_PRECONDITION(aTimer == self->mReflowContinueTimer, "Unexpected timer");
self->mReflowContinueTimer = nullptr;
self->ScheduleReflow();
}
bool
PresShell::ScheduleReflowOffTimer()
{
NS_PRECONDITION(!mReflowScheduled, "Shouldn't get here");
ASSERT_REFLOW_SCHEDULED_STATE();
if (!mReflowContinueTimer) {
mReflowContinueTimer = do_CreateInstance("@mozilla.org/timer;1");
if (!mReflowContinueTimer ||
NS_FAILED(mReflowContinueTimer->
InitWithFuncCallback(sReflowContinueCallback, this, 30,
nsITimer::TYPE_ONE_SHOT))) {
return false;
}
}
return true;
}
bool
PresShell::DoReflow(nsIFrame* target, bool aInterruptible)
{
if (mIsZombie) {
return true;
}
gfxTextPerfMetrics* tp = mPresContext->GetTextPerfMetrics();
TimeStamp timeStart;
if (tp) {
tp->Accumulate();
tp->reflowCount++;
timeStart = TimeStamp::Now();
}
target->SchedulePaint();
nsIFrame *parent = nsLayoutUtils::GetCrossDocParentFrame(target);
while (parent) {
nsSVGEffects::InvalidateDirectRenderingObservers(parent);
parent = nsLayoutUtils::GetCrossDocParentFrame(parent);
}
nsAutoCString docURL("N/A");
nsIURI *uri = mDocument->GetDocumentURI();
if (uri)
uri->GetSpec(docURL);
PROFILER_LABEL_PRINTF("PresShell", "DoReflow",
js::ProfileEntry::Category::GRAPHICS, "(%s)", docURL.get());
nsDocShell* docShell = static_cast<nsDocShell*>(GetPresContext()->GetDocShell());
if (docShell) {
docShell->AddProfileTimelineMarker("Reflow", TRACING_INTERVAL_START);
}
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
nsRenderingContext rcx(CreateReferenceRenderingContext());
#ifdef DEBUG
mCurrentReflowRoot = target;
#endif
target->WillReflow(mPresContext);
// If the target frame is the root of the frame hierarchy, then
// use all the available space. If it's simply a `reflow root',
// then use the target frame's size as the available space.
WritingMode wm = target->GetWritingMode();
LogicalSize size(wm);
if (target == rootFrame) {
size = LogicalSize(wm, mPresContext->GetVisibleArea().Size());
} else {
size = target->GetLogicalSize();
}
NS_ASSERTION(!target->GetNextInFlow() && !target->GetPrevInFlow(),
"reflow roots should never split");
// Don't pass size directly to the reflow state, since a
// constrained height implies page/column breaking.
LogicalSize reflowSize(wm, size.ISize(wm), NS_UNCONSTRAINEDSIZE);
nsHTMLReflowState reflowState(mPresContext, target, &rcx, reflowSize,
nsHTMLReflowState::CALLER_WILL_INIT);
reflowState.mOrthogonalLimit = size.BSize(wm);
if (rootFrame == target) {
reflowState.Init(mPresContext);
// When the root frame is being reflowed with unconstrained block-size
// (which happens when we're called from
// nsDocumentViewer::SizeToContent), we're effectively doing a
// resize in the block direction, since it changes the meaning of
// percentage block-sizes even if no block-sizes actually changed.
// The same applies when we reflow again after that computation. This is
// an unusual case, and isn't caught by nsHTMLReflowState::InitResizeFlags.
bool hasUnconstrainedBSize = size.BSize(wm) == NS_UNCONSTRAINEDSIZE;
if (hasUnconstrainedBSize || mLastRootReflowHadUnconstrainedBSize) {
reflowState.SetVResize(true);
}
mLastRootReflowHadUnconstrainedBSize = hasUnconstrainedBSize;
} else {
// Initialize reflow state with current used border and padding,
// in case this was set specially by the parent frame when the reflow root
// was reflowed by its parent.
nsMargin currentBorder = target->GetUsedBorder();
nsMargin currentPadding = target->GetUsedPadding();
reflowState.Init(mPresContext, -1, -1, &currentBorder, &currentPadding);
}
// fix the computed height
NS_ASSERTION(reflowState.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0),
"reflow state should not set margin for reflow roots");
if (size.BSize(wm) != NS_UNCONSTRAINEDSIZE) {
nscoord computedBSize =
size.BSize(wm) - reflowState.ComputedLogicalBorderPadding().BStartEnd(wm);
computedBSize = std::max(computedBSize, 0);
reflowState.SetComputedBSize(computedBSize);
}
NS_ASSERTION(reflowState.ComputedISize() ==
size.ISize(wm) -
reflowState.ComputedLogicalBorderPadding().IStartEnd(wm),
"reflow state computed incorrect inline size");
mPresContext->ReflowStarted(aInterruptible);
mIsReflowing = true;
nsReflowStatus status;
nsHTMLReflowMetrics desiredSize(reflowState);
target->Reflow(mPresContext, desiredSize, reflowState, status);
// If an incremental reflow is initiated at a frame other than the
// root frame, then its desired size had better not change! If it's
// initiated at the root, then the size better not change unless its
// height was unconstrained to start with.
nsRect boundsRelativeToTarget = nsRect(0, 0, desiredSize.Width(), desiredSize.Height());
NS_ASSERTION((target == rootFrame &&
size.BSize(wm) == NS_UNCONSTRAINEDSIZE) ||
(desiredSize.ISize(wm) == size.ISize(wm) &&
desiredSize.BSize(wm) == size.BSize(wm)),
"non-root frame's desired size changed during an "
"incremental reflow");
NS_ASSERTION(target == rootFrame ||
desiredSize.VisualOverflow().IsEqualInterior(boundsRelativeToTarget),
"non-root reflow roots must not have visible overflow");
NS_ASSERTION(target == rootFrame ||
desiredSize.ScrollableOverflow().IsEqualEdges(boundsRelativeToTarget),
"non-root reflow roots must not have scrollable overflow");
NS_ASSERTION(status == NS_FRAME_COMPLETE,
"reflow roots should never split");
target->SetSize(boundsRelativeToTarget.Size());
// Always use boundsRelativeToTarget here, not desiredSize.GetVisualOverflowArea(),
// because for root frames (where they could be different, since root frames
// are allowed to have overflow) the root view bounds need to match the
// viewport bounds; the view manager "window dimensions" code depends on it.
nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, target,
target->GetView(),
boundsRelativeToTarget);
nsContainerFrame::SyncWindowProperties(mPresContext, target,
target->GetView(), &rcx);
target->DidReflow(mPresContext, nullptr, nsDidReflowStatus::FINISHED);
if (target == rootFrame && size.BSize(wm) == NS_UNCONSTRAINEDSIZE) {
mPresContext->SetVisibleArea(boundsRelativeToTarget);
}
#ifdef DEBUG
mCurrentReflowRoot = nullptr;
#endif
NS_ASSERTION(mPresContext->HasPendingInterrupt() ||
mFramesToDirty.Count() == 0,
"Why do we need to dirty anything if not interrupted?");
mIsReflowing = false;
bool interrupted = mPresContext->HasPendingInterrupt();
if (interrupted) {
// Make sure target gets reflowed again.
mFramesToDirty.EnumerateEntries(&MarkFramesDirtyToRoot, target);
NS_ASSERTION(NS_SUBTREE_DIRTY(target), "Why is the target not dirty?");
mDirtyRoots.AppendElement(target);
mDocument->SetNeedLayoutFlush();
// Clear mFramesToDirty after we've done the NS_SUBTREE_DIRTY(target)
// assertion so that if it fails it's easier to see what's going on.
#ifdef NOISY_INTERRUPTIBLE_REFLOW
printf("mFramesToDirty.Count() == %u\n", mFramesToDirty.Count());
#endif /* NOISY_INTERRUPTIBLE_REFLOW */
mFramesToDirty.Clear();
// Any FlushPendingNotifications with interruptible reflows
// should be suppressed now. We don't want to do extra reflow work
// before our reflow event happens.
mSuppressInterruptibleReflows = true;
MaybeScheduleReflow();
}
#ifdef PR_LOGGING
// dump text perf metrics for reflows with significant text processing
if (tp) {
if (tp->current.numChars > 100) {
TimeDuration reflowTime = TimeStamp::Now() - timeStart;
LogTextPerfStats(tp, this, tp->current,
reflowTime.ToMilliseconds(), eLog_reflow, nullptr);
}
tp->Accumulate();
}
#endif
if (docShell) {
docShell->AddProfileTimelineMarker("Reflow", TRACING_INTERVAL_END);
}
return !interrupted;
}
#ifdef DEBUG
void
PresShell::DoVerifyReflow()
{
if (GetVerifyReflowEnable()) {
// First synchronously render what we have so far so that we can
// see it.
nsView* rootView = mViewManager->GetRootView();
mViewManager->InvalidateView(rootView);
FlushPendingNotifications(Flush_Layout);
mInVerifyReflow = true;
bool ok = VerifyIncrementalReflow();
mInVerifyReflow = false;
if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
printf("ProcessReflowCommands: finished (%s)\n",
ok ? "ok" : "failed");
}
if (!mDirtyRoots.IsEmpty()) {
printf("XXX yikes! reflow commands queued during verify-reflow\n");
}
}
}
#endif
// used with Telemetry metrics
#define NS_LONG_REFLOW_TIME_MS 5000
bool
PresShell::ProcessReflowCommands(bool aInterruptible)
{
if (mDirtyRoots.IsEmpty() && !mShouldUnsuppressPainting) {
// Nothing to do; bail out
return true;
}
mozilla::TimeStamp timerStart = mozilla::TimeStamp::Now();
bool interrupted = false;
if (!mDirtyRoots.IsEmpty()) {
#ifdef DEBUG
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf("ProcessReflowCommands: begin incremental reflow\n");
}
#endif
// If reflow is interruptible, then make a note of our deadline.
const PRIntervalTime deadline = aInterruptible
? PR_IntervalNow() + PR_MicrosecondsToInterval(gMaxRCProcessingTime)
: (PRIntervalTime)0;
// Scope for the reflow entry point
{
nsAutoScriptBlocker scriptBlocker;
WillDoReflow();
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
do {
// Send an incremental reflow notification to the target frame.
int32_t idx = mDirtyRoots.Length() - 1;
nsIFrame *target = mDirtyRoots[idx];
mDirtyRoots.RemoveElementAt(idx);
if (!NS_SUBTREE_DIRTY(target)) {
// It's not dirty anymore, which probably means the notification
// was posted in the middle of a reflow (perhaps with a reflow
// root in the middle). Don't do anything.
continue;
}
interrupted = !DoReflow(target, aInterruptible);
// Keep going until we're out of reflow commands, or we've run
// past our deadline, or we're interrupted.
} while (!interrupted && !mDirtyRoots.IsEmpty() &&
(!aInterruptible || PR_IntervalNow() < deadline));
interrupted = !mDirtyRoots.IsEmpty();
}
// Exiting the scriptblocker might have killed us
if (!mIsDestroying) {
DidDoReflow(aInterruptible, interrupted);
}
// DidDoReflow might have killed us
if (!mIsDestroying) {
#ifdef DEBUG
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf("\nPresShell::ProcessReflowCommands() finished: this=%p\n",
(void*)this);
}
DoVerifyReflow();
#endif
// If any new reflow commands were enqueued during the reflow, schedule
// another reflow event to process them. Note that we want to do this
// after DidDoReflow(), since that method can change whether there are
// dirty roots around by flushing, and there's no point in posting a
// reflow event just to have the flush revoke it.
if (!mDirtyRoots.IsEmpty()) {
MaybeScheduleReflow();
// And tell our document that we might need flushing
mDocument->SetNeedLayoutFlush();
}
}
}
if (!mIsDestroying && mShouldUnsuppressPainting &&
mDirtyRoots.IsEmpty()) {
// We only unlock if we're out of reflows. It's pointless
// to unlock if reflows are still pending, since reflows
// are just going to thrash the frames around some more. By
// waiting we avoid an overeager "jitter" effect.
mShouldUnsuppressPainting = false;
UnsuppressAndInvalidate();
}
if (mDocument->GetRootElement()) {
TimeDuration elapsed = TimeStamp::Now() - timerStart;
int32_t intElapsed = int32_t(elapsed.ToMilliseconds());
Telemetry::ID id;
if (mDocument->GetRootElement()->IsXUL()) {
id = mIsActive
? Telemetry::XUL_FOREGROUND_REFLOW_MS
: Telemetry::XUL_BACKGROUND_REFLOW_MS;
} else {
id = mIsActive
? Telemetry::HTML_FOREGROUND_REFLOW_MS_2
: Telemetry::HTML_BACKGROUND_REFLOW_MS_2;
}
Telemetry::Accumulate(id, intElapsed);
if (intElapsed > NS_LONG_REFLOW_TIME_MS) {
Telemetry::Accumulate(Telemetry::LONG_REFLOW_INTERRUPTIBLE,
aInterruptible ? 1 : 0);
}
}
return !interrupted;
}
void
PresShell::WindowSizeMoveDone()
{
if (mPresContext) {
EventStateManager::ClearGlobalActiveContent(nullptr);
ClearMouseCapture(nullptr);
}
}
#ifdef MOZ_XUL
/*
* It's better to add stuff to the |DidSetStyleContext| method of the
* relevant frames than adding it here. These methods should (ideally,
* anyway) go away.
*/
// Return value says whether to walk children.
typedef bool (* frameWalkerFn)(nsIFrame *aFrame, void *aClosure);
static bool
ReResolveMenusAndTrees(nsIFrame *aFrame, void *aClosure)
{
// Trees have a special style cache that needs to be flushed when
// the theme changes.
nsTreeBodyFrame *treeBody = do_QueryFrame(aFrame);
if (treeBody)
treeBody->ClearStyleAndImageCaches();
// We deliberately don't re-resolve style on a menu's popup
// sub-content, since doing so slows menus to a crawl. That means we
// have to special-case them on a skin switch, and ensure that the
// popup frames just get destroyed completely.
nsMenuFrame* menu = do_QueryFrame(aFrame);
if (menu)
menu->CloseMenu(true);
return true;
}
static bool
ReframeImageBoxes(nsIFrame *aFrame, void *aClosure)
{
nsStyleChangeList *list = static_cast<nsStyleChangeList*>(aClosure);
if (aFrame->GetType() == nsGkAtoms::imageBoxFrame) {
list->AppendChange(aFrame, aFrame->GetContent(),
NS_STYLE_HINT_FRAMECHANGE);
return false; // don't walk descendants
}
return true; // walk descendants
}
static void
WalkFramesThroughPlaceholders(nsPresContext *aPresContext, nsIFrame *aFrame,
frameWalkerFn aFunc, void *aClosure)
{
bool walkChildren = (*aFunc)(aFrame, aClosure);
if (!walkChildren)
return;
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow, and recur through the
// out-of-flows of placeholders.
WalkFramesThroughPlaceholders(aPresContext,
nsPlaceholderFrame::GetRealFrameFor(child),
aFunc, aClosure);
}
}
}
}
#endif
NS_IMETHODIMP
PresShell::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
#ifdef MOZ_XUL
if (!nsCRT::strcmp(aTopic, "chrome-flush-skin-caches")) {
nsIFrame *rootFrame = mFrameConstructor->GetRootFrame();
// Need to null-check because "chrome-flush-skin-caches" can happen
// at interesting times during startup.
if (rootFrame) {
NS_ASSERTION(mViewManager, "View manager must exist");
nsWeakFrame weakRoot(rootFrame);
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
if (weakRoot.IsAlive()) {
WalkFramesThroughPlaceholders(mPresContext, rootFrame,
&ReResolveMenusAndTrees, nullptr);
// Because "chrome:" URL equality is messy, reframe image box
// frames (hack!).
nsStyleChangeList changeList;
WalkFramesThroughPlaceholders(mPresContext, rootFrame,
ReframeImageBoxes, &changeList);
// Mark ourselves as not safe to flush while we're doing frame
// construction.
{
nsAutoScriptBlocker scriptBlocker;
++mChangeNestCount;
RestyleManager* restyleManager = mPresContext->RestyleManager();
restyleManager->ProcessRestyledFrames(changeList);
restyleManager->FlushOverflowChangedTracker();
--mChangeNestCount;
}
}
}
return NS_OK;
}
#endif
if (!nsCRT::strcmp(aTopic, "agent-sheet-added") && mStyleSet) {
AddAgentSheet(aSubject);
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "user-sheet-added") && mStyleSet) {
AddUserSheet(aSubject);
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "author-sheet-added") && mStyleSet) {
AddAuthorSheet(aSubject);
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "agent-sheet-removed") && mStyleSet) {
RemoveSheet(nsStyleSet::eAgentSheet, aSubject);
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "user-sheet-removed") && mStyleSet) {
RemoveSheet(nsStyleSet::eUserSheet, aSubject);
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "author-sheet-removed") && mStyleSet) {
RemoveSheet(nsStyleSet::eDocSheet, aSubject);
return NS_OK;
}
NS_WARNING("unrecognized topic in PresShell::Observe");
return NS_ERROR_FAILURE;
}
bool
nsIPresShell::AddRefreshObserverInternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType)
{
nsPresContext* presContext = GetPresContext();
return presContext &&
presContext->RefreshDriver()->AddRefreshObserver(aObserver, aFlushType);
}
/* virtual */ bool
nsIPresShell::AddRefreshObserverExternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType)
{
return AddRefreshObserverInternal(aObserver, aFlushType);
}
bool
nsIPresShell::RemoveRefreshObserverInternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType)
{
nsPresContext* presContext = GetPresContext();
return presContext &&
presContext->RefreshDriver()->RemoveRefreshObserver(aObserver, aFlushType);
}
/* virtual */ bool
nsIPresShell::RemoveRefreshObserverExternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType)
{
return RemoveRefreshObserverInternal(aObserver, aFlushType);
}
/* virtual */ bool
nsIPresShell::AddPostRefreshObserver(nsAPostRefreshObserver* aObserver)
{
nsPresContext* presContext = GetPresContext();
if (!presContext) {
return false;
}
presContext->RefreshDriver()->AddPostRefreshObserver(aObserver);
return true;
}
/* virtual */ bool
nsIPresShell::RemovePostRefreshObserver(nsAPostRefreshObserver* aObserver)
{
nsPresContext* presContext = GetPresContext();
if (!presContext) {
return false;
}
presContext->RefreshDriver()->RemovePostRefreshObserver(aObserver);
return true;
}
//------------------------------------------------------
// End of protected and private methods on the PresShell
//------------------------------------------------------
//------------------------------------------------------------------
//-- Delayed event Classes Impls
//------------------------------------------------------------------
PresShell::DelayedInputEvent::DelayedInputEvent() :
DelayedEvent(),
mEvent(nullptr)
{
}
PresShell::DelayedInputEvent::~DelayedInputEvent()
{
delete mEvent;
}
void
PresShell::DelayedInputEvent::Dispatch()
{
if (!mEvent || !mEvent->widget) {
return;
}
nsCOMPtr<nsIWidget> widget = mEvent->widget;
nsEventStatus status;
widget->DispatchEvent(mEvent, status);
}
PresShell::DelayedMouseEvent::DelayedMouseEvent(WidgetMouseEvent* aEvent) :
DelayedInputEvent()
{
WidgetMouseEvent* mouseEvent =
new WidgetMouseEvent(aEvent->mFlags.mIsTrusted,
aEvent->message,
aEvent->widget,
aEvent->reason,
aEvent->context);
mouseEvent->AssignMouseEventData(*aEvent, false);
mEvent = mouseEvent;
}
PresShell::DelayedKeyEvent::DelayedKeyEvent(WidgetKeyboardEvent* aEvent) :
DelayedInputEvent()
{
WidgetKeyboardEvent* keyEvent =
new WidgetKeyboardEvent(aEvent->mFlags.mIsTrusted,
aEvent->message,
aEvent->widget);
keyEvent->AssignKeyEventData(*aEvent, false);
keyEvent->mFlags.mIsSynthesizedForTests = aEvent->mFlags.mIsSynthesizedForTests;
mEvent = keyEvent;
}
// Start of DEBUG only code
#ifdef DEBUG
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg)
{
nsAutoString n1, n2;
if (k1) {
k1->GetFrameName(n1);
} else {
n1.AssignLiteral(MOZ_UTF16("(null)"));
}
if (k2) {
k2->GetFrameName(n2);
} else {
n2.AssignLiteral(MOZ_UTF16("(null)"));
}
printf("verifyreflow: %s %p != %s %p %s\n",
NS_LossyConvertUTF16toASCII(n1).get(), (void*)k1,
NS_LossyConvertUTF16toASCII(n2).get(), (void*)k2, aMsg);
}
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
const nsRect& r1, const nsRect& r2)
{
printf("VerifyReflow Error:\n");
nsAutoString name;
if (k1) {
k1->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
}
printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
if (k2) {
k2->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
}
printf("{%d, %d, %d, %d}\n %s\n",
r2.x, r2.y, r2.width, r2.height, aMsg);
}
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
const nsIntRect& r1, const nsIntRect& r2)
{
printf("VerifyReflow Error:\n");
nsAutoString name;
if (k1) {
k1->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
}
printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
if (k2) {
k2->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
}
printf("{%d, %d, %d, %d}\n %s\n",
r2.x, r2.y, r2.width, r2.height, aMsg);
}
static bool
CompareTrees(nsPresContext* aFirstPresContext, nsIFrame* aFirstFrame,
nsPresContext* aSecondPresContext, nsIFrame* aSecondFrame)
{
if (!aFirstPresContext || !aFirstFrame || !aSecondPresContext || !aSecondFrame)
return true;
// XXX Evil hack to reduce false positives; I can't seem to figure
// out how to flush scrollbar changes correctly
//if (aFirstFrame->GetType() == nsGkAtoms::scrollbarFrame)
// return true;
bool ok = true;
nsIFrame::ChildListIterator lists1(aFirstFrame);
nsIFrame::ChildListIterator lists2(aSecondFrame);
do {
const nsFrameList& kids1 = !lists1.IsDone() ? lists1.CurrentList() : nsFrameList();
const nsFrameList& kids2 = !lists2.IsDone() ? lists2.CurrentList() : nsFrameList();
int32_t l1 = kids1.GetLength();
int32_t l2 = kids2.GetLength();;
if (l1 != l2) {
ok = false;
LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
"child counts don't match: ");
printf("%d != %d\n", l1, l2);
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
break;
}
}
nsIntRect r1, r2;
nsView* v1;
nsView* v2;
for (nsFrameList::Enumerator e1(kids1), e2(kids2);
;
e1.Next(), e2.Next()) {
nsIFrame* k1 = e1.get();
nsIFrame* k2 = e2.get();
if (((nullptr == k1) && (nullptr != k2)) ||
((nullptr != k1) && (nullptr == k2))) {
ok = false;
LogVerifyMessage(k1, k2, "child lists are different\n");
break;
}
else if (nullptr != k1) {
// Verify that the frames are the same size
if (!k1->GetRect().IsEqualInterior(k2->GetRect())) {
ok = false;
LogVerifyMessage(k1, k2, "(frame rects)", k1->GetRect(), k2->GetRect());
}
// Make sure either both have views or neither have views; if they
// do have views, make sure the views are the same size. If the
// views have widgets, make sure they both do or neither does. If
// they do, make sure the widgets are the same size.
v1 = k1->GetView();
v2 = k2->GetView();
if (((nullptr == v1) && (nullptr != v2)) ||
((nullptr != v1) && (nullptr == v2))) {
ok = false;
LogVerifyMessage(k1, k2, "child views are not matched\n");
}
else if (nullptr != v1) {
if (!v1->GetBounds().IsEqualInterior(v2->GetBounds())) {
LogVerifyMessage(k1, k2, "(view rects)", v1->GetBounds(), v2->GetBounds());
}
nsIWidget* w1 = v1->GetWidget();
nsIWidget* w2 = v2->GetWidget();
if (((nullptr == w1) && (nullptr != w2)) ||
((nullptr != w1) && (nullptr == w2))) {
ok = false;
LogVerifyMessage(k1, k2, "child widgets are not matched\n");
}
else if (nullptr != w1) {
w1->GetBounds(r1);
w2->GetBounds(r2);
if (!r1.IsEqualEdges(r2)) {
LogVerifyMessage(k1, k2, "(widget rects)", r1, r2);
}
}
}
if (!ok && (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags))) {
break;
}
// XXX Should perhaps compare their float managers.
// Compare the sub-trees too
if (!CompareTrees(aFirstPresContext, k1, aSecondPresContext, k2)) {
ok = false;
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
break;
}
}
}
else {
break;
}
}
if (!ok && (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags))) {
break;
}
lists1.Next();
lists2.Next();
if (lists1.IsDone() != lists2.IsDone() ||
(!lists1.IsDone() && lists1.CurrentID() != lists2.CurrentID())) {
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
ok = false;
}
LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
"child list names are not matched: ");
fprintf(stdout, "%s != %s\n",
!lists1.IsDone() ? mozilla::layout::ChildListName(lists1.CurrentID()) : "(null)",
!lists2.IsDone() ? mozilla::layout::ChildListName(lists2.CurrentID()) : "(null)");
break;
}
} while (ok && !lists1.IsDone());
return ok;
}
#endif
#if 0
static nsIFrame*
FindTopFrame(nsIFrame* aRoot)
{
if (aRoot) {
nsIContent* content = aRoot->GetContent();
if (content) {
nsIAtom* tag;
content->GetTag(tag);
if (nullptr != tag) {
NS_RELEASE(tag);
return aRoot;
}
}
// Try one of the children
nsIFrame* kid = aRoot->GetFirstPrincipalChild();
while (nullptr != kid) {
nsIFrame* result = FindTopFrame(kid);
if (nullptr != result) {
return result;
}
kid = kid->GetNextSibling();
}
}
return nullptr;
}
#endif
#ifdef DEBUG
nsStyleSet*
PresShell::CloneStyleSet(nsStyleSet* aSet)
{
nsStyleSet *clone = new nsStyleSet();
int32_t i, n = aSet->SheetCount(nsStyleSet::eOverrideSheet);
for (i = 0; i < n; i++) {
nsIStyleSheet* ss = aSet->StyleSheetAt(nsStyleSet::eOverrideSheet, i);
if (ss)
clone->AppendStyleSheet(nsStyleSet::eOverrideSheet, ss);
}
// The document expects to insert document stylesheets itself
#if 0
n = aSet->SheetCount(nsStyleSet::eDocSheet);
for (i = 0; i < n; i++) {
nsIStyleSheet* ss = aSet->StyleSheetAt(nsStyleSet::eDocSheet, i);
if (ss)
clone->AddDocStyleSheet(ss, mDocument);
}
#endif
n = aSet->SheetCount(nsStyleSet::eUserSheet);
for (i = 0; i < n; i++) {
nsIStyleSheet* ss = aSet->StyleSheetAt(nsStyleSet::eUserSheet, i);
if (ss)
clone->AppendStyleSheet(nsStyleSet::eUserSheet, ss);
}
n = aSet->SheetCount(nsStyleSet::eAgentSheet);
for (i = 0; i < n; i++) {
nsIStyleSheet* ss = aSet->StyleSheetAt(nsStyleSet::eAgentSheet, i);
if (ss)
clone->AppendStyleSheet(nsStyleSet::eAgentSheet, ss);
}
return clone;
}
// After an incremental reflow, we verify the correctness by doing a
// full reflow into a fresh frame tree.
bool
PresShell::VerifyIncrementalReflow()
{
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Building Verification Tree...\n");
}
// Create a presentation context to view the new frame tree
nsRefPtr<nsPresContext> cx =
new nsRootPresContext(mDocument, mPresContext->IsPaginated() ?
nsPresContext::eContext_PrintPreview :
nsPresContext::eContext_Galley);
NS_ENSURE_TRUE(cx, false);
nsDeviceContext *dc = mPresContext->DeviceContext();
nsresult rv = cx->Init(dc);
NS_ENSURE_SUCCESS(rv, false);
// Get our scrolling preference
nsView* rootView = mViewManager->GetRootView();
NS_ENSURE_TRUE(rootView->HasWidget(), false);
nsIWidget* parentWidget = rootView->GetWidget();
// Create a new view manager.
nsRefPtr<nsViewManager> vm = new nsViewManager();
NS_ENSURE_TRUE(vm, false);
rv = vm->Init(dc);
NS_ENSURE_SUCCESS(rv, false);
// Create a child window of the parent that is our "root view/window"
// Create a view
nsRect tbounds = mPresContext->GetVisibleArea();
nsView* view = vm->CreateView(tbounds, nullptr);
NS_ENSURE_TRUE(view, false);
//now create the widget for the view
rv = view->CreateWidgetForParent(parentWidget, nullptr, true);
NS_ENSURE_SUCCESS(rv, false);
// Setup hierarchical relationship in view manager
vm->SetRootView(view);
// Make the new presentation context the same size as our
// presentation context.
nsRect r = mPresContext->GetVisibleArea();
cx->SetVisibleArea(r);
// Create a new presentation shell to view the document. Use the
// exact same style information that this document has.
nsAutoPtr<nsStyleSet> newSet(CloneStyleSet(mStyleSet));
nsCOMPtr<nsIPresShell> sh = mDocument->CreateShell(cx, vm, newSet);
NS_ENSURE_TRUE(sh, false);
newSet.forget();
// Note that after we create the shell, we must make sure to destroy it
sh->SetVerifyReflowEnable(false); // turn off verify reflow while we're reflowing the test frame tree
vm->SetPresShell(sh);
{
nsAutoCauseReflowNotifier crNotifier(this);
sh->Initialize(r.width, r.height);
}
mDocument->BindingManager()->ProcessAttachedQueue();
sh->FlushPendingNotifications(Flush_Layout);
sh->SetVerifyReflowEnable(true); // turn on verify reflow again now that we're done reflowing the test frame tree
// Force the non-primary presshell to unsuppress; it doesn't want to normally
// because it thinks it's hidden
((PresShell*)sh.get())->mPaintingSuppressed = false;
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Verification Tree built, comparing...\n");
}
// Now that the document has been reflowed, use its frame tree to
// compare against our frame tree.
nsIFrame* root1 = mFrameConstructor->GetRootFrame();
nsIFrame* root2 = sh->GetRootFrame();
bool ok = CompareTrees(mPresContext, root1, cx, root2);
if (!ok && (VERIFY_REFLOW_NOISY & gVerifyReflowFlags)) {
printf("Verify reflow failed, primary tree:\n");
root1->List(stdout, 0);
printf("Verification tree:\n");
root2->List(stdout, 0);
}
#if 0
// Sample code for dumping page to png
// XXX Needs to be made more flexible
if (!ok) {
nsString stra;
static int num = 0;
stra.AppendLiteral("C:\\mozilla\\mozilla\\debug\\filea");
stra.AppendInt(num);
stra.AppendLiteral(".png");
gfxUtils::WriteAsPNG(sh, stra);
nsString strb;
strb.AppendLiteral("C:\\mozilla\\mozilla\\debug\\fileb");
strb.AppendInt(num);
strb.AppendLiteral(".png");
gfxUtils::WriteAsPNG(sh, strb);
++num;
}
#endif
sh->EndObservingDocument();
sh->Destroy();
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Finished Verifying Reflow...\n");
}
return ok;
}
// Layout debugging hooks
void
PresShell::ListStyleContexts(nsIFrame *aRootFrame, FILE *out, int32_t aIndent)
{
nsStyleContext *sc = aRootFrame->StyleContext();
if (sc)
sc->List(out, aIndent);
}
void
PresShell::ListStyleSheets(FILE *out, int32_t aIndent)
{
int32_t sheetCount = mStyleSet->SheetCount(nsStyleSet::eDocSheet);
for (int32_t i = 0; i < sheetCount; ++i) {
mStyleSet->StyleSheetAt(nsStyleSet::eDocSheet, i)->List(out, aIndent);
fputs("\n", out);
}
}
void
PresShell::VerifyStyleTree()
{
VERIFY_STYLE_TREE;
}
#endif
//=============================================================
//=============================================================
//-- Debug Reflow Counts
//=============================================================
//=============================================================
#ifdef MOZ_REFLOW_PERF
//-------------------------------------------------------------
void
PresShell::DumpReflows()
{
if (mReflowCountMgr) {
nsAutoCString uriStr;
if (mDocument) {
nsIURI *uri = mDocument->GetDocumentURI();
if (uri) {
uri->GetPath(uriStr);
}
}
mReflowCountMgr->DisplayTotals(uriStr.get());
mReflowCountMgr->DisplayHTMLTotals(uriStr.get());
mReflowCountMgr->DisplayDiffsInTotals("Differences");
}
}
//-------------------------------------------------------------
void
PresShell::CountReflows(const char * aName, nsIFrame * aFrame)
{
if (mReflowCountMgr) {
mReflowCountMgr->Add(aName, aFrame);
}
}
//-------------------------------------------------------------
void
PresShell::PaintCount(const char * aName,
nsRenderingContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame * aFrame,
const nsPoint& aOffset,
uint32_t aColor)
{
if (mReflowCountMgr) {
mReflowCountMgr->PaintCount(aName, aRenderingContext, aPresContext,
aFrame, aOffset, aColor);
}
}
//-------------------------------------------------------------
void
PresShell::SetPaintFrameCount(bool aPaintFrameCounts)
{
if (mReflowCountMgr) {
mReflowCountMgr->SetPaintFrameCounts(aPaintFrameCounts);
}
}
bool
PresShell::IsPaintingFrameCounts()
{
if (mReflowCountMgr)
return mReflowCountMgr->IsPaintingFrameCounts();
return false;
}
//------------------------------------------------------------------
//-- Reflow Counter Classes Impls
//------------------------------------------------------------------
//------------------------------------------------------------------
ReflowCounter::ReflowCounter(ReflowCountMgr * aMgr) :
mMgr(aMgr)
{
ClearTotals();
SetTotalsCache();
}
//------------------------------------------------------------------
ReflowCounter::~ReflowCounter()
{
}
//------------------------------------------------------------------
void ReflowCounter::ClearTotals()
{
mTotal = 0;
}
//------------------------------------------------------------------
void ReflowCounter::SetTotalsCache()
{
mCacheTotal = mTotal;
}
//------------------------------------------------------------------
void ReflowCounter::CalcDiffInTotals()
{
mCacheTotal = mTotal - mCacheTotal;
}
//------------------------------------------------------------------
void ReflowCounter::DisplayTotals(const char * aStr)
{
DisplayTotals(mTotal, aStr?aStr:"Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayDiffTotals(const char * aStr)
{
DisplayTotals(mCacheTotal, aStr?aStr:"Diff Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayHTMLTotals(const char * aStr)
{
DisplayHTMLTotals(mTotal, aStr?aStr:"Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayTotals(uint32_t aTotal, const char * aTitle)
{
// figure total
if (aTotal == 0) {
return;
}
ReflowCounter * gTots = (ReflowCounter *)mMgr->LookUp(kGrandTotalsStr);
printf("%25s\t", aTitle);
printf("%d\t", aTotal);
if (gTots != this && aTotal > 0) {
gTots->Add(aTotal);
}
}
//------------------------------------------------------------------
void ReflowCounter::DisplayHTMLTotals(uint32_t aTotal, const char * aTitle)
{
if (aTotal == 0) {
return;
}
ReflowCounter * gTots = (ReflowCounter *)mMgr->LookUp(kGrandTotalsStr);
FILE * fd = mMgr->GetOutFile();
if (!fd) {
return;
}
fprintf(fd, "<tr><td><center>%s</center></td>", aTitle);
fprintf(fd, "<td><center>%d</center></td></tr>\n", aTotal);
if (gTots != this && aTotal > 0) {
gTots->Add(aTotal);
}
}
//------------------------------------------------------------------
//-- ReflowCountMgr
//------------------------------------------------------------------
#define KEY_BUF_SIZE_FOR_PTR 24 // adequate char[] buffer to sprintf a pointer
ReflowCountMgr::ReflowCountMgr()
{
mCounts = PL_NewHashTable(10, PL_HashString, PL_CompareStrings,
PL_CompareValues, nullptr, nullptr);
mIndiFrameCounts = PL_NewHashTable(10, PL_HashString, PL_CompareStrings,
PL_CompareValues, nullptr, nullptr);
mCycledOnce = false;
mDumpFrameCounts = false;
mDumpFrameByFrameCounts = false;
mPaintFrameByFrameCounts = false;
}
//------------------------------------------------------------------
ReflowCountMgr::~ReflowCountMgr()
{
CleanUp();
}
//------------------------------------------------------------------
ReflowCounter * ReflowCountMgr::LookUp(const char * aName)
{
if (nullptr != mCounts) {
ReflowCounter * counter = (ReflowCounter *)PL_HashTableLookup(mCounts, aName);
return counter;
}
return nullptr;
}
//------------------------------------------------------------------
void ReflowCountMgr::Add(const char * aName, nsIFrame * aFrame)
{
NS_ASSERTION(aName != nullptr, "Name shouldn't be null!");
if (mDumpFrameCounts && nullptr != mCounts) {
ReflowCounter * counter = (ReflowCounter *)PL_HashTableLookup(mCounts, aName);
if (counter == nullptr) {
counter = new ReflowCounter(this);
char * name = NS_strdup(aName);
NS_ASSERTION(name != nullptr, "null ptr");
PL_HashTableAdd(mCounts, name, counter);
}
counter->Add();
}
if ((mDumpFrameByFrameCounts || mPaintFrameByFrameCounts) &&
nullptr != mIndiFrameCounts &&
aFrame != nullptr) {
char key[KEY_BUF_SIZE_FOR_PTR];
sprintf(key, "%p", (void*)aFrame);
IndiReflowCounter * counter = (IndiReflowCounter *)PL_HashTableLookup(mIndiFrameCounts, key);
if (counter == nullptr) {
counter = new IndiReflowCounter(this);
counter->mFrame = aFrame;
counter->mName.AssignASCII(aName);
PL_HashTableAdd(mIndiFrameCounts, NS_strdup(key), counter);
}
// this eliminates extra counts from super classes
if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
counter->mCount++;
counter->mCounter.Add(1);
}
}
}
//------------------------------------------------------------------
void ReflowCountMgr::PaintCount(const char* aName,
nsRenderingContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame* aFrame,
const nsPoint& aOffset,
uint32_t aColor)
{
if (mPaintFrameByFrameCounts &&
nullptr != mIndiFrameCounts &&
aFrame != nullptr) {
char key[KEY_BUF_SIZE_FOR_PTR];
sprintf(key, "%p", (void*)aFrame);
IndiReflowCounter * counter =
(IndiReflowCounter *)PL_HashTableLookup(mIndiFrameCounts, key);
if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
DrawTarget* drawTarget = aRenderingContext->GetDrawTarget();
int32_t appUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
aRenderingContext->ThebesContext()->Save();
gfxPoint devPixelOffset =
nsLayoutUtils::PointToGfxPoint(aOffset, appUnitsPerDevPixel);
aRenderingContext->ThebesContext()->SetMatrix(
aRenderingContext->ThebesContext()->CurrentMatrix().Translate(devPixelOffset));
nsFont font(eFamily_serif, NS_FONT_STYLE_NORMAL,
NS_FONT_WEIGHT_NORMAL, NS_FONT_STRETCH_NORMAL, 0,
nsPresContext::CSSPixelsToAppUnits(11));
nsRefPtr<nsFontMetrics> fm;
aPresContext->DeviceContext()->GetMetricsFor(font,
// We have one frame, therefore we must have a root...
aPresContext->GetPresShell()->GetRootFrame()->
StyleFont()->mLanguage,
gfxFont::eHorizontal,
aPresContext->GetUserFontSet(),
aPresContext->GetTextPerfMetrics(),
*getter_AddRefs(fm));
char buf[16];
int len = sprintf(buf, "%d", counter->mCount);
nscoord x = 0, y = fm->MaxAscent();
nscoord width, height = fm->MaxHeight();
fm->SetTextRunRTL(false);
width = fm->GetWidth(buf, len, aRenderingContext);;
uint32_t color;
uint32_t color2;
if (aColor != 0) {
color = aColor;
color2 = NS_RGB(0,0,0);
} else {
uint8_t rc = 0, gc = 0, bc = 0;
if (counter->mCount < 5) {
rc = 255;
gc = 255;
} else if ( counter->mCount < 11) {
gc = 255;
} else {
rc = 255;
}
color = NS_RGB(rc,gc,bc);
color2 = NS_RGB(rc/2,gc/2,bc/2);
}
nsRect rect(0,0, width+15, height+15);
Rect devPxRect =
NSRectToSnappedRect(rect, appUnitsPerDevPixel, *drawTarget);
ColorPattern black(ToDeviceColor(Color(0.f, 0.f, 0.f, 1.f)));
drawTarget->FillRect(devPxRect, black);
aRenderingContext->ThebesContext()->SetColor(color2);
fm->DrawString(buf, len, x+15, y+15, aRenderingContext);
aRenderingContext->ThebesContext()->SetColor(color);
fm->DrawString(buf, len, x, y, aRenderingContext);
aRenderingContext->ThebesContext()->Restore();
}
}
}
//------------------------------------------------------------------
int ReflowCountMgr::RemoveItems(PLHashEntry *he, int i, void *arg)
{
char *str = (char *)he->key;
ReflowCounter * counter = (ReflowCounter *)he->value;
delete counter;
NS_Free(str);
return HT_ENUMERATE_REMOVE;
}
//------------------------------------------------------------------
int ReflowCountMgr::RemoveIndiItems(PLHashEntry *he, int i, void *arg)
{
char *str = (char *)he->key;
IndiReflowCounter * counter = (IndiReflowCounter *)he->value;
delete counter;
NS_Free(str);
return HT_ENUMERATE_REMOVE;
}
//------------------------------------------------------------------
void ReflowCountMgr::CleanUp()
{
if (nullptr != mCounts) {
PL_HashTableEnumerateEntries(mCounts, RemoveItems, nullptr);
PL_HashTableDestroy(mCounts);
mCounts = nullptr;
}
if (nullptr != mIndiFrameCounts) {
PL_HashTableEnumerateEntries(mIndiFrameCounts, RemoveIndiItems, nullptr);
PL_HashTableDestroy(mIndiFrameCounts);
mIndiFrameCounts = nullptr;
}
}
//------------------------------------------------------------------
int ReflowCountMgr::DoSingleTotal(PLHashEntry *he, int i, void *arg)
{
char *str = (char *)he->key;
ReflowCounter * counter = (ReflowCounter *)he->value;
counter->DisplayTotals(str);
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::DoGrandTotals()
{
if (nullptr != mCounts) {
ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
if (gTots == nullptr) {
gTots = new ReflowCounter(this);
PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
} else {
gTots->ClearTotals();
}
printf("\t\t\t\tTotal\n");
for (uint32_t i=0;i<78;i++) {
printf("-");
}
printf("\n");
PL_HashTableEnumerateEntries(mCounts, DoSingleTotal, this);
}
}
static void RecurseIndiTotals(nsPresContext* aPresContext,
PLHashTable * aHT,
nsIFrame * aParentFrame,
int32_t aLevel)
{
if (aParentFrame == nullptr) {
return;
}
char key[KEY_BUF_SIZE_FOR_PTR];
sprintf(key, "%p", (void*)aParentFrame);
IndiReflowCounter * counter = (IndiReflowCounter *)PL_HashTableLookup(aHT, key);
if (counter) {
counter->mHasBeenOutput = true;
char * name = ToNewCString(counter->mName);
for (int32_t i=0;i<aLevel;i++) printf(" ");
printf("%s - %p [%d][", name, (void*)aParentFrame, counter->mCount);
printf("%d", counter->mCounter.GetTotal());
printf("]\n");
nsMemory::Free(name);
}
nsIFrame* child = aParentFrame->GetFirstPrincipalChild();
while (child) {
RecurseIndiTotals(aPresContext, aHT, child, aLevel+1);
child = child->GetNextSibling();
}
}
//------------------------------------------------------------------
int ReflowCountMgr::DoSingleIndi(PLHashEntry *he, int i, void *arg)
{
IndiReflowCounter * counter = (IndiReflowCounter *)he->value;
if (counter && !counter->mHasBeenOutput) {
char * name = ToNewCString(counter->mName);
printf("%s - %p [%d][", name, (void*)counter->mFrame, counter->mCount);
printf("%d", counter->mCounter.GetTotal());
printf("]\n");
nsMemory::Free(name);
}
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::DoIndiTotalsTree()
{
if (nullptr != mCounts) {
printf("\n------------------------------------------------\n");
printf("-- Individual Frame Counts\n");
printf("------------------------------------------------\n");
if (mPresShell) {
nsIFrame * rootFrame = mPresShell->FrameManager()->GetRootFrame();
RecurseIndiTotals(mPresContext, mIndiFrameCounts, rootFrame, 0);
printf("------------------------------------------------\n");
printf("-- Individual Counts of Frames not in Root Tree\n");
printf("------------------------------------------------\n");
PL_HashTableEnumerateEntries(mIndiFrameCounts, DoSingleIndi, this);
}
}
}
//------------------------------------------------------------------
int ReflowCountMgr::DoSingleHTMLTotal(PLHashEntry *he, int i, void *arg)
{
char *str = (char *)he->key;
ReflowCounter * counter = (ReflowCounter *)he->value;
counter->DisplayHTMLTotals(str);
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::DoGrandHTMLTotals()
{
if (nullptr != mCounts) {
ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
if (gTots == nullptr) {
gTots = new ReflowCounter(this);
PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
} else {
gTots->ClearTotals();
}
static const char * title[] = {"Class", "Reflows"};
fprintf(mFD, "<tr>");
for (uint32_t i=0; i < ArrayLength(title); i++) {
fprintf(mFD, "<td><center><b>%s<b></center></td>", title[i]);
}
fprintf(mFD, "</tr>\n");
PL_HashTableEnumerateEntries(mCounts, DoSingleHTMLTotal, this);
}
}
//------------------------------------
void ReflowCountMgr::DisplayTotals(const char * aStr)
{
#ifdef DEBUG_rods
printf("%s\n", aStr?aStr:"No name");
#endif
if (mDumpFrameCounts) {
DoGrandTotals();
}
if (mDumpFrameByFrameCounts) {
DoIndiTotalsTree();
}
}
//------------------------------------
void ReflowCountMgr::DisplayHTMLTotals(const char * aStr)
{
#ifdef WIN32x // XXX NOT XP!
char name[1024];
char * sptr = strrchr(aStr, '/');
if (sptr) {
sptr++;
strcpy(name, sptr);
char * eptr = strrchr(name, '.');
if (eptr) {
*eptr = 0;
}
strcat(name, "_stats.html");
}
mFD = fopen(name, "w");
if (mFD) {
fprintf(mFD, "<html><head><title>Reflow Stats</title></head><body>\n");
const char * title = aStr?aStr:"No name";
fprintf(mFD, "<center><b>%s</b><br><table border=1 style=\"background-color:#e0e0e0\">", title);
DoGrandHTMLTotals();
fprintf(mFD, "</center></table>\n");
fprintf(mFD, "</body></html>\n");
fclose(mFD);
mFD = nullptr;
}
#endif // not XP!
}
//------------------------------------------------------------------
int ReflowCountMgr::DoClearTotals(PLHashEntry *he, int i, void *arg)
{
ReflowCounter * counter = (ReflowCounter *)he->value;
counter->ClearTotals();
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::ClearTotals()
{
PL_HashTableEnumerateEntries(mCounts, DoClearTotals, this);
}
//------------------------------------------------------------------
void ReflowCountMgr::ClearGrandTotals()
{
if (nullptr != mCounts) {
ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
if (gTots == nullptr) {
gTots = new ReflowCounter(this);
PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
} else {
gTots->ClearTotals();
gTots->SetTotalsCache();
}
}
}
//------------------------------------------------------------------
int ReflowCountMgr::DoDisplayDiffTotals(PLHashEntry *he, int i, void *arg)
{
bool cycledOnce = (arg != 0);
char *str = (char *)he->key;
ReflowCounter * counter = (ReflowCounter *)he->value;
if (cycledOnce) {
counter->CalcDiffInTotals();
counter->DisplayDiffTotals(str);
}
counter->SetTotalsCache();
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::DisplayDiffsInTotals(const char * aStr)
{
if (mCycledOnce) {
printf("Differences\n");
for (int32_t i=0;i<78;i++) {
printf("-");
}
printf("\n");
ClearGrandTotals();
}
PL_HashTableEnumerateEntries(mCounts, DoDisplayDiffTotals, (void *)mCycledOnce);
mCycledOnce = true;
}
#endif // MOZ_REFLOW_PERF
// make a color string like #RRGGBB
void ColorToString(nscolor aColor, nsAutoString &aString)
{
char buf[8];
PR_snprintf(buf, sizeof(buf), "#%02x%02x%02x",
NS_GET_R(aColor), NS_GET_G(aColor), NS_GET_B(aColor));
CopyASCIItoUTF16(buf, aString);
}
nsIFrame* nsIPresShell::GetAbsoluteContainingBlock(nsIFrame *aFrame)
{
return FrameConstructor()->GetAbsoluteContainingBlock(aFrame,
nsCSSFrameConstructor::ABS_POS);
}
#ifdef ACCESSIBILITY
bool
nsIPresShell::IsAccessibilityActive()
{
return GetAccService() != nullptr;
}
nsAccessibilityService*
nsIPresShell::AccService()
{
return GetAccService();
}
#endif
void nsIPresShell::InitializeStatics()
{
NS_ASSERTION(!gCaptureTouchList, "InitializeStatics called multiple times!");
gCaptureTouchList = new nsRefPtrHashtable<nsUint32HashKey, dom::Touch>;
gPointerCaptureList = new nsClassHashtable<nsUint32HashKey, PointerCaptureInfo>;
gActivePointersIds = new nsClassHashtable<nsUint32HashKey, PointerInfo>;
}
void nsIPresShell::ReleaseStatics()
{
NS_ASSERTION(gCaptureTouchList, "ReleaseStatics called without Initialize!");
delete gCaptureTouchList;
gCaptureTouchList = nullptr;
delete gPointerCaptureList;
gPointerCaptureList = nullptr;
delete gActivePointersIds;
gActivePointersIds = nullptr;
}
// Asks our docshell whether we're active.
void PresShell::QueryIsActive()
{
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (mDocument) {
nsIDocument* displayDoc = mDocument->GetDisplayDocument();
if (displayDoc) {
// Ok, we're an external resource document -- we need to use our display
// document's docshell to determine "IsActive" status, since we lack
// a container.
NS_ABORT_IF_FALSE(!container,
"external resource doc shouldn't have "
"its own container");
nsIPresShell* displayPresShell = displayDoc->GetShell();
if (displayPresShell) {
container = displayPresShell->GetPresContext()->GetContainerWeak();
}
}
}
nsCOMPtr<nsIDocShell> docshell(do_QueryInterface(container));
if (docshell) {
bool isActive;
nsresult rv = docshell->GetIsActive(&isActive);
if (NS_SUCCEEDED(rv))
SetIsActive(isActive);
}
}
// Helper for propagating mIsActive changes to external resources
static bool
SetExternalResourceIsActive(nsIDocument* aDocument, void* aClosure)
{
nsIPresShell* shell = aDocument->GetShell();
if (shell) {
shell->SetIsActive(*static_cast<bool*>(aClosure));
}
return true;
}
static void
SetPluginIsActive(nsISupports* aSupports, void* aClosure)
{
nsCOMPtr<nsIContent> content(do_QueryInterface(aSupports));
if (!content) {
return;
}
nsIFrame *frame = content->GetPrimaryFrame();
nsIObjectFrame *objectFrame = do_QueryFrame(frame);
if (objectFrame) {
objectFrame->SetIsDocumentActive(*static_cast<bool*>(aClosure));
}
}
nsresult
PresShell::SetIsActive(bool aIsActive)
{
NS_PRECONDITION(mDocument, "should only be called with a document");
mIsActive = aIsActive;
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->PresContext() == presContext) {
presContext->RefreshDriver()->SetThrottled(!mIsActive);
}
// Propagate state-change to my resource documents' PresShells
mDocument->EnumerateExternalResources(SetExternalResourceIsActive,
&aIsActive);
mDocument->EnumerateActivityObservers(SetPluginIsActive,
&aIsActive);
nsresult rv = UpdateImageLockingState();
#ifdef ACCESSIBILITY
if (aIsActive) {
nsAccessibilityService* accService = AccService();
if (accService) {
accService->PresShellActivated(this);
}
}
#endif
// We have this odd special case here because remote content behaves
// differently from same-process content when "hidden". In
// desktop-type "browser UIs", hidden "tabs" have documents that are
// part of the chrome tree. When the tabs are hidden, their content
// is no longer part of the visible document tree, and the layers
// for the content are naturally released.
//
// Remote content is its own top-level tree in its subprocess. When
// it's "hidden", there's no transaction in which the document
// thinks it's not visible, so layers can be retained forever. This
// is problematic when those layers uselessly hold on to precious
// resources like directly texturable memory.
//
// PresShell::SetIsActive() is the first C++ entry point at which we
// (i) know that our parent process wants our content to be hidden;
// and (ii) has easy access to the TabChild. So we use this
// notification to signal the TabChild to drop its layer tree and
// stop trying to repaint.
if (TabChild* tab = TabChild::GetFrom(this)) {
if (aIsActive) {
tab->MakeVisible();
if (!mIsZombie) {
if (nsIFrame* root = mFrameConstructor->GetRootFrame()) {
FrameLayerBuilder::InvalidateAllLayersForFrame(
nsLayoutUtils::GetDisplayRootFrame(root));
root->SchedulePaint();
}
}
} else {
tab->MakeHidden();
}
}
return rv;
}
/*
* Determines the current image locking state. Called when one of the
* dependent factors changes.
*/
nsresult
PresShell::UpdateImageLockingState()
{
// We're locked if we're both thawed and active.
return mDocument->SetImageLockingState(!mFrozen && mIsActive);
}
PresShell*
PresShell::GetRootPresShell()
{
if (mPresContext) {
nsPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
return static_cast<PresShell*>(rootPresContext->PresShell());
}
}
return nullptr;
}
void
PresShell::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
nsArenaMemoryStats *aArenaObjectsSize,
size_t *aPresShellSize,
size_t *aStyleSetsSize,
size_t *aTextRunsSize,
size_t *aPresContextSize)
{
mFrameArena.AddSizeOfExcludingThis(aMallocSizeOf, aArenaObjectsSize);
*aPresShellSize += aMallocSizeOf(this);
if (mCaret) {
*aPresShellSize += mCaret->SizeOfIncludingThis(aMallocSizeOf);
}
*aPresShellSize += mVisibleImages.SizeOfExcludingThis(nullptr,
aMallocSizeOf,
nullptr);
*aPresShellSize += mFramesToDirty.SizeOfExcludingThis(nullptr,
aMallocSizeOf,
nullptr);
*aPresShellSize += aArenaObjectsSize->mOther;
*aStyleSetsSize += StyleSet()->SizeOfIncludingThis(aMallocSizeOf);
*aTextRunsSize += SizeOfTextRuns(aMallocSizeOf);
*aPresContextSize += mPresContext->SizeOfIncludingThis(aMallocSizeOf);
}
size_t
PresShell::SizeOfTextRuns(MallocSizeOf aMallocSizeOf) const
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
return 0;
}
// clear the TEXT_RUN_MEMORY_ACCOUNTED flags
nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, nullptr,
/* clear = */true);
// collect the total memory in use for textruns
return nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, aMallocSizeOf,
/* clear = */false);
}
void
nsIPresShell::MarkFixedFramesForReflow(IntrinsicDirty aIntrinsicDirty)
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
const nsFrameList& childList = rootFrame->GetChildList(nsIFrame::kFixedList);
for (nsFrameList::Enumerator e(childList); !e.AtEnd(); e.Next()) {
FrameNeedsReflow(e.get(), aIntrinsicDirty, NS_FRAME_IS_DIRTY);
}
}
}
void
nsIPresShell::SetScrollPositionClampingScrollPortSize(nscoord aWidth, nscoord aHeight)
{
if (!mScrollPositionClampingScrollPortSizeSet ||
mScrollPositionClampingScrollPortSize.width != aWidth ||
mScrollPositionClampingScrollPortSize.height != aHeight) {
mScrollPositionClampingScrollPortSizeSet = true;
mScrollPositionClampingScrollPortSize.width = aWidth;
mScrollPositionClampingScrollPortSize.height = aHeight;
if (nsIScrollableFrame* rootScrollFrame = GetRootScrollFrameAsScrollable()) {
rootScrollFrame->MarkScrollbarsDirtyForReflow();
}
MarkFixedFramesForReflow(eResize);
}
}
void
nsIPresShell::SetContentDocumentFixedPositionMargins(const nsMargin& aMargins)
{
if (mContentDocumentFixedPositionMargins == aMargins) {
return;
}
mContentDocumentFixedPositionMargins = aMargins;
MarkFixedFramesForReflow(eResize);
}
void
PresShell::SetupFontInflation()
{
mFontSizeInflationEmPerLine = nsLayoutUtils::FontSizeInflationEmPerLine();
mFontSizeInflationMinTwips = nsLayoutUtils::FontSizeInflationMinTwips();
mFontSizeInflationLineThreshold = nsLayoutUtils::FontSizeInflationLineThreshold();
mFontSizeInflationForceEnabled = nsLayoutUtils::FontSizeInflationForceEnabled();
mFontSizeInflationDisabledInMasterProcess = nsLayoutUtils::FontSizeInflationDisabledInMasterProcess();
NotifyFontSizeInflationEnabledIsDirty();
}
void
nsIPresShell::RecomputeFontSizeInflationEnabled()
{
mFontSizeInflationEnabledIsDirty = false;
MOZ_ASSERT(mPresContext, "our pres context should not be null");
if ((FontSizeInflationEmPerLine() == 0 &&
FontSizeInflationMinTwips() == 0) || mPresContext->IsChrome()) {
mFontSizeInflationEnabled = false;
return;
}
// Force-enabling font inflation always trumps the heuristics here.
if (!FontSizeInflationForceEnabled()) {
if (TabChild* tab = TabChild::GetFrom(this)) {
// We're in a child process. Cancel inflation if we're not
// async-pan zoomed.
if (!tab->IsAsyncPanZoomEnabled()) {
mFontSizeInflationEnabled = false;
return;
}
} else if (XRE_GetProcessType() == GeckoProcessType_Default) {
// We're in the master process. Cancel inflation if it's been
// explicitly disabled.
if (FontSizeInflationDisabledInMasterProcess()) {
mFontSizeInflationEnabled = false;
return;
}
}
}
// XXXjwir3:
// See bug 706918, comment 23 for more information on this particular section
// of the code. We're using "screen size" in place of the size of the content
// area, because on mobile, these are close or equal. This will work for our
// purposes (bug 706198), but it will need to be changed in the future to be
// more correct when we bring the rest of the viewport code into platform.
// We actually want the size of the content area, in the event that we don't
// have any metadata about the width and/or height. On mobile, the screen size
// and the size of the content area are very close, or the same value.
// In XUL fennec, the content area is the size of the <browser> widget, but
// in native fennec, the content area is the size of the Gecko LayerView
// object.
// TODO:
// Once bug 716575 has been resolved, this code should be changed so that it
// does the right thing on all platforms.
nsresult rv;
nsCOMPtr<nsIScreenManager> screenMgr =
do_GetService("@mozilla.org/gfx/screenmanager;1", &rv);
if (!NS_SUCCEEDED(rv)) {
mFontSizeInflationEnabled = false;
return;
}
nsCOMPtr<nsIScreen> screen;
screenMgr->GetPrimaryScreen(getter_AddRefs(screen));
if (screen) {
int32_t screenLeft, screenTop, screenWidth, screenHeight;
screen->GetRect(&screenLeft, &screenTop, &screenWidth, &screenHeight);
nsViewportInfo vInf =
nsContentUtils::GetViewportInfo(GetDocument(), ScreenIntSize(screenWidth, screenHeight));
if (vInf.GetDefaultZoom() >= CSSToScreenScale(1.0f) || vInf.IsAutoSizeEnabled()) {
mFontSizeInflationEnabled = false;
return;
}
}
mFontSizeInflationEnabled = true;
}
bool
nsIPresShell::FontSizeInflationEnabled()
{
if (mFontSizeInflationEnabledIsDirty) {
RecomputeFontSizeInflationEnabled();
}
return mFontSizeInflationEnabled;
}
void
nsIPresShell::SetMaxLineBoxWidth(nscoord aMaxLineBoxWidth)
{
NS_ASSERTION(aMaxLineBoxWidth >= 0, "attempting to set max line box width to a negative value");
if (mMaxLineBoxWidth != aMaxLineBoxWidth) {
mMaxLineBoxWidth = aMaxLineBoxWidth;
mReflowOnZoomPending = true;
FrameNeedsReflow(GetRootFrame(), eResize, NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
void
PresShell::PausePainting()
{
if (GetPresContext()->RefreshDriver()->PresContext() != GetPresContext())
return;
mPaintingIsFrozen = true;
GetPresContext()->RefreshDriver()->Freeze();
}
void
PresShell::ResumePainting()
{
if (GetPresContext()->RefreshDriver()->PresContext() != GetPresContext())
return;
mPaintingIsFrozen = false;
GetPresContext()->RefreshDriver()->Thaw();
}
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