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gecko/content/events/src/nsEventStateManager.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=80: */
/* 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/. */
#include "mozilla/dom/TabParent.h"
#include "nsCOMPtr.h"
#include "nsEventStateManager.h"
#include "nsEventListenerManager.h"
#include "nsIMEStateManager.h"
#include "nsContentEventHandler.h"
#include "nsIContent.h"
#include "nsINodeInfo.h"
#include "nsIDocument.h"
#include "nsIFrame.h"
#include "nsIWidget.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsDOMEvent.h"
#include "nsGkAtoms.h"
#include "nsIEditorDocShell.h"
#include "nsIFormControl.h"
#include "nsIComboboxControlFrame.h"
#include "nsIScrollableFrame.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDOMXULControlElement.h"
#include "nsINameSpaceManager.h"
#include "nsIBaseWindow.h"
#include "nsISelection.h"
#include "nsFrameSelection.h"
#include "nsPIDOMWindow.h"
#include "nsPIWindowRoot.h"
#include "nsIEnumerator.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeNode.h"
#include "nsIWebNavigation.h"
#include "nsIContentViewer.h"
#ifdef MOZ_XUL
#include "nsXULPopupManager.h"
#endif
#include "nsFrameManager.h"
#include "nsIServiceManager.h"
#include "nsIScriptSecurityManager.h"
#include "nsFocusManager.h"
#include "nsIDOMXULElement.h"
#include "nsIDOMDocument.h"
#include "nsIDOMKeyEvent.h"
#include "nsIObserverService.h"
#include "nsIDocShell.h"
#include "nsIMarkupDocumentViewer.h"
#include "nsIDOMMouseScrollEvent.h"
#include "nsIDOMDragEvent.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMUIEvent.h"
#include "nsDOMDragEvent.h"
#include "nsIDOMNSEditableElement.h"
#include "nsIDOMMozBrowserFrame.h"
#include "nsIMozBrowserFrame.h"
#include "nsCaret.h"
#include "nsSubDocumentFrame.h"
#include "nsIFrameTraversal.h"
#include "nsLayoutCID.h"
#include "nsLayoutUtils.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsUnicharUtils.h"
#include "nsContentUtils.h"
#include "imgIContainer.h"
#include "nsIProperties.h"
#include "nsISupportsPrimitives.h"
#include "nsEventDispatcher.h"
#include "nsServiceManagerUtils.h"
#include "nsITimer.h"
#include "nsFontMetrics.h"
#include "nsIDOMXULDocument.h"
#include "nsIDragService.h"
#include "nsIDragSession.h"
#include "nsDOMDataTransfer.h"
#include "nsContentAreaDragDrop.h"
#ifdef MOZ_XUL
#include "nsTreeBodyFrame.h"
#endif
#include "nsIController.h"
#include "nsICommandParams.h"
#include "mozilla/Services.h"
#include "mozAutoDocUpdate.h"
#include "nsHTMLLabelElement.h"
#include "mozilla/Preferences.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Attributes.h"
#include "sampler.h"
#include "nsIDOMClientRect.h"
#ifdef XP_MACOSX
#import <ApplicationServices/ApplicationServices.h>
#endif
using namespace mozilla;
using namespace mozilla::dom;
//#define DEBUG_DOCSHELL_FOCUS
#define NS_USER_INTERACTION_INTERVAL 5000 // ms
static NS_DEFINE_CID(kFrameTraversalCID, NS_FRAMETRAVERSAL_CID);
static bool sLeftClickOnly = true;
static bool sKeyCausesActivation = true;
static PRUint32 sESMInstanceCount = 0;
static PRInt32 sChromeAccessModifier = 0, sContentAccessModifier = 0;
PRInt32 nsEventStateManager::sUserInputEventDepth = 0;
bool nsEventStateManager::sNormalLMouseEventInProcess = false;
nsEventStateManager* nsEventStateManager::sActiveESM = nullptr;
nsIDocument* nsEventStateManager::sMouseOverDocument = nullptr;
nsWeakFrame nsEventStateManager::sLastDragOverFrame = nullptr;
nsIntPoint nsEventStateManager::sLastRefPoint = nsIntPoint(0,0);
nsIntPoint nsEventStateManager::sLastScreenPoint = nsIntPoint(0,0);
nsIntPoint nsEventStateManager::sLastClientPoint = nsIntPoint(0,0);
bool nsEventStateManager::sIsPointerLocked = false;
// Reference to the pointer locked element.
nsWeakPtr nsEventStateManager::sPointerLockedElement;
// Reference to the document which requested pointer lock.
nsWeakPtr nsEventStateManager::sPointerLockedDoc;
nsCOMPtr<nsIContent> nsEventStateManager::sDragOverContent = nullptr;
static PRUint32 gMouseOrKeyboardEventCounter = 0;
static nsITimer* gUserInteractionTimer = nullptr;
static nsITimerCallback* gUserInteractionTimerCallback = nullptr;
// Pixel scroll accumulation for synthetic line scrolls
static nscoord gPixelScrollDeltaX = 0;
static nscoord gPixelScrollDeltaY = 0;
static PRUint32 gPixelScrollDeltaTimeout = 0;
static nscoord
GetScrollableLineHeight(nsIFrame* aTargetFrame);
TimeStamp nsEventStateManager::sHandlingInputStart;
static inline bool
IsMouseEventReal(nsEvent* aEvent)
{
NS_ABORT_IF_FALSE(NS_IS_MOUSE_EVENT_STRUCT(aEvent), "Not a mouse event");
// Return true if not synthesized.
return static_cast<nsMouseEvent*>(aEvent)->reason == nsMouseEvent::eReal;
}
#ifdef DEBUG_DOCSHELL_FOCUS
static void
PrintDocTree(nsIDocShellTreeItem* aParentItem, int aLevel)
{
for (PRInt32 i=0;i<aLevel;i++) printf(" ");
PRInt32 childWebshellCount;
aParentItem->GetChildCount(&childWebshellCount);
nsCOMPtr<nsIDocShell> parentAsDocShell(do_QueryInterface(aParentItem));
PRInt32 type;
aParentItem->GetItemType(&type);
nsCOMPtr<nsIPresShell> presShell;
parentAsDocShell->GetPresShell(getter_AddRefs(presShell));
nsRefPtr<nsPresContext> presContext;
parentAsDocShell->GetPresContext(getter_AddRefs(presContext));
nsCOMPtr<nsIContentViewer> cv;
parentAsDocShell->GetContentViewer(getter_AddRefs(cv));
nsCOMPtr<nsIDOMDocument> domDoc;
if (cv)
cv->GetDOMDocument(getter_AddRefs(domDoc));
nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
nsCOMPtr<nsIDOMWindow> domwin = doc ? doc->GetWindow() : nullptr;
nsIURI* uri = doc ? doc->GetDocumentURI() : nullptr;
printf("DS %p Type %s Cnt %d Doc %p DW %p EM %p%c",
static_cast<void*>(parentAsDocShell.get()),
type==nsIDocShellTreeItem::typeChrome?"Chrome":"Content",
childWebshellCount, static_cast<void*>(doc.get()),
static_cast<void*>(domwin.get()),
static_cast<void*>(presContext ? presContext->EventStateManager() : nullptr),
uri ? ' ' : '\n');
if (uri) {
nsCAutoString spec;
uri->GetSpec(spec);
printf("\"%s\"\n", spec.get());
}
if (childWebshellCount > 0) {
for (PRInt32 i = 0; i < childWebshellCount; i++) {
nsCOMPtr<nsIDocShellTreeItem> child;
aParentItem->GetChildAt(i, getter_AddRefs(child));
PrintDocTree(child, aLevel + 1);
}
}
}
static void
PrintDocTreeAll(nsIDocShellTreeItem* aItem)
{
nsCOMPtr<nsIDocShellTreeItem> item = aItem;
for(;;) {
nsCOMPtr<nsIDocShellTreeItem> parent;
item->GetParent(getter_AddRefs(parent));
if (!parent)
break;
item = parent;
}
PrintDocTree(item, 0);
}
#endif
class nsUITimerCallback MOZ_FINAL : public nsITimerCallback
{
public:
nsUITimerCallback() : mPreviousCount(0) {}
NS_DECL_ISUPPORTS
NS_DECL_NSITIMERCALLBACK
private:
PRUint32 mPreviousCount;
};
NS_IMPL_ISUPPORTS1(nsUITimerCallback, nsITimerCallback)
// If aTimer is nullptr, this method always sends "user-interaction-inactive"
// notification.
NS_IMETHODIMP
nsUITimerCallback::Notify(nsITimer* aTimer)
{
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (!obs)
return NS_ERROR_FAILURE;
if ((gMouseOrKeyboardEventCounter == mPreviousCount) || !aTimer) {
gMouseOrKeyboardEventCounter = 0;
obs->NotifyObservers(nullptr, "user-interaction-inactive", nullptr);
if (gUserInteractionTimer) {
gUserInteractionTimer->Cancel();
NS_RELEASE(gUserInteractionTimer);
}
} else {
obs->NotifyObservers(nullptr, "user-interaction-active", nullptr);
nsEventStateManager::UpdateUserActivityTimer();
}
mPreviousCount = gMouseOrKeyboardEventCounter;
return NS_OK;
}
enum {
MOUSE_SCROLL_N_LINES,
MOUSE_SCROLL_PAGE,
MOUSE_SCROLL_HISTORY,
MOUSE_SCROLL_ZOOM,
MOUSE_SCROLL_PIXELS
};
// mask values for ui.key.chromeAccess and ui.key.contentAccess
#define NS_MODIFIER_SHIFT 1
#define NS_MODIFIER_CONTROL 2
#define NS_MODIFIER_ALT 4
#define NS_MODIFIER_META 8
#define NS_MODIFIER_OS 16
static nsIDocument *
GetDocumentFromWindow(nsIDOMWindow *aWindow)
{
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(aWindow);
nsCOMPtr<nsIDocument> doc;
if (win) {
doc = do_QueryInterface(win->GetExtantDocument());
}
return doc;
}
static PRInt32
GetAccessModifierMaskFromPref(PRInt32 aItemType)
{
PRInt32 accessKey = Preferences::GetInt("ui.key.generalAccessKey", -1);
switch (accessKey) {
case -1: break; // use the individual prefs
case nsIDOMKeyEvent::DOM_VK_SHIFT: return NS_MODIFIER_SHIFT;
case nsIDOMKeyEvent::DOM_VK_CONTROL: return NS_MODIFIER_CONTROL;
case nsIDOMKeyEvent::DOM_VK_ALT: return NS_MODIFIER_ALT;
case nsIDOMKeyEvent::DOM_VK_META: return NS_MODIFIER_META;
case nsIDOMKeyEvent::DOM_VK_WIN: return NS_MODIFIER_OS;
default: return 0;
}
switch (aItemType) {
case nsIDocShellTreeItem::typeChrome:
return Preferences::GetInt("ui.key.chromeAccess", 0);
case nsIDocShellTreeItem::typeContent:
return Preferences::GetInt("ui.key.contentAccess", 0);
default:
return 0;
}
}
static void
GetBasePrefKeyForMouseWheel(nsMouseScrollEvent* aEvent, nsACString& aPref)
{
NS_NAMED_LITERAL_CSTRING(prefbase, "mousewheel");
NS_NAMED_LITERAL_CSTRING(horizscroll, ".horizscroll");
NS_NAMED_LITERAL_CSTRING(withshift, ".withshiftkey");
NS_NAMED_LITERAL_CSTRING(withalt, ".withaltkey");
NS_NAMED_LITERAL_CSTRING(withcontrol, ".withcontrolkey");
NS_NAMED_LITERAL_CSTRING(withmetakey, ".withmetakey");
NS_NAMED_LITERAL_CSTRING(withno, ".withnokey");
aPref = prefbase;
if (aEvent->scrollFlags & nsMouseScrollEvent::kIsHorizontal) {
aPref.Append(horizscroll);
}
if (aEvent->IsShift()) {
aPref.Append(withshift);
} else if (aEvent->IsControl()) {
aPref.Append(withcontrol);
} else if (aEvent->IsAlt()) {
aPref.Append(withalt);
} else if (aEvent->IsMeta()) {
aPref.Append(withmetakey);
} else {
aPref.Append(withno);
}
}
class nsMouseWheelTransaction {
public:
static nsIFrame* GetTargetFrame() { return sTargetFrame; }
static void BeginTransaction(nsIFrame* aTargetFrame,
PRInt32 aNumLines,
bool aScrollHorizontal);
// Be careful, UpdateTransaction may fire a DOM event, therefore, the target
// frame might be destroyed in the event handler.
static bool UpdateTransaction(PRInt32 aNumLines,
bool aScrollHorizontal);
static void EndTransaction();
static void OnEvent(nsEvent* aEvent);
static void Shutdown();
static PRUint32 GetTimeoutTime();
static PRInt32 AccelerateWheelDelta(PRInt32 aScrollLines,
bool aIsHorizontal, bool aAllowScrollSpeedOverride,
nsIScrollableFrame::ScrollUnit *aScrollQuantity,
bool aLimitToMaxOnePageScroll = true);
static bool IsAccelerationEnabled();
enum {
kScrollSeriesTimeout = 80
};
protected:
static nsIntPoint GetScreenPoint(nsGUIEvent* aEvent);
static void OnFailToScrollTarget();
static void OnTimeout(nsITimer *aTimer, void *aClosure);
static void SetTimeout();
static PRUint32 GetIgnoreMoveDelayTime();
static PRInt32 GetAccelerationStart();
static PRInt32 GetAccelerationFactor();
static PRInt32 OverrideSystemScrollSpeed(PRInt32 aScrollLines,
bool aIsHorizontal);
static PRInt32 ComputeAcceleratedWheelDelta(PRInt32 aDelta, PRInt32 aFactor);
static PRInt32 LimitToOnePageScroll(PRInt32 aScrollLines,
bool aIsHorizontal,
nsIScrollableFrame::ScrollUnit *aScrollQuantity);
static nsWeakFrame sTargetFrame;
static PRUint32 sTime; // in milliseconds
static PRUint32 sMouseMoved; // in milliseconds
static nsITimer* sTimer;
static PRInt32 sScrollSeriesCounter;
};
nsWeakFrame nsMouseWheelTransaction::sTargetFrame(nullptr);
PRUint32 nsMouseWheelTransaction::sTime = 0;
PRUint32 nsMouseWheelTransaction::sMouseMoved = 0;
nsITimer* nsMouseWheelTransaction::sTimer = nullptr;
PRInt32 nsMouseWheelTransaction::sScrollSeriesCounter = 0;
static bool
OutOfTime(PRUint32 aBaseTime, PRUint32 aThreshold)
{
PRUint32 now = PR_IntervalToMilliseconds(PR_IntervalNow());
return (now - aBaseTime > aThreshold);
}
static bool
CanScrollInRange(nscoord aMin, nscoord aValue, nscoord aMax, PRInt32 aDirection)
{
return aDirection > 0 ? aValue < aMax : aMin < aValue;
}
static bool
CanScrollOn(nsIScrollableFrame* aScrollFrame, PRInt32 aNumLines,
bool aScrollHorizontal)
{
NS_PRECONDITION(aScrollFrame, "aScrollFrame is null");
NS_PRECONDITION(aNumLines, "aNumLines must be non-zero");
nsPoint scrollPt = aScrollFrame->GetScrollPosition();
nsRect scrollRange = aScrollFrame->GetScrollRange();
return aScrollHorizontal
? CanScrollInRange(scrollRange.x, scrollPt.x, scrollRange.XMost(), aNumLines)
: CanScrollInRange(scrollRange.y, scrollPt.y, scrollRange.YMost(), aNumLines);
}
void
nsMouseWheelTransaction::BeginTransaction(nsIFrame* aTargetFrame,
PRInt32 aNumLines,
bool aScrollHorizontal)
{
NS_ASSERTION(!sTargetFrame, "previous transaction is not finished!");
sTargetFrame = aTargetFrame;
sScrollSeriesCounter = 0;
if (!UpdateTransaction(aNumLines, aScrollHorizontal)) {
NS_ERROR("BeginTransaction is called even cannot scroll the frame");
EndTransaction();
}
}
bool
nsMouseWheelTransaction::UpdateTransaction(PRInt32 aNumLines,
bool aScrollHorizontal)
{
nsIScrollableFrame* sf = GetTargetFrame()->GetScrollTargetFrame();
NS_ENSURE_TRUE(sf, false);
if (!CanScrollOn(sf, aNumLines, aScrollHorizontal)) {
OnFailToScrollTarget();
// We should not modify the transaction state when the view will not be
// scrolled actually.
return false;
}
SetTimeout();
if (sScrollSeriesCounter != 0 && OutOfTime(sTime, kScrollSeriesTimeout))
sScrollSeriesCounter = 0;
sScrollSeriesCounter++;
// We should use current time instead of nsEvent.time.
// 1. Some events doesn't have the correct creation time.
// 2. If the computer runs slowly by other processes eating the CPU resource,
// the event creation time doesn't keep real time.
sTime = PR_IntervalToMilliseconds(PR_IntervalNow());
sMouseMoved = 0;
return true;
}
void
nsMouseWheelTransaction::EndTransaction()
{
if (sTimer)
sTimer->Cancel();
sTargetFrame = nullptr;
sScrollSeriesCounter = 0;
}
void
nsMouseWheelTransaction::OnEvent(nsEvent* aEvent)
{
if (!sTargetFrame)
return;
if (OutOfTime(sTime, GetTimeoutTime())) {
// Even if the scroll event which is handled after timeout, but onTimeout
// was not fired by timer, then the scroll event will scroll old frame,
// therefore, we should call OnTimeout here and ensure to finish the old
// transaction.
OnTimeout(nullptr, nullptr);
return;
}
PRInt32 message = aEvent->message;
// If the event is query scroll target info event, that causes modifying
// wheel transaction because DoScrollText() needs to use them. Therefore,
// we should handle the event as its mouse scroll event here.
if (message == NS_QUERY_SCROLL_TARGET_INFO) {
nsQueryContentEvent* queryEvent = static_cast<nsQueryContentEvent*>(aEvent);
message = queryEvent->mInput.mMouseScrollEvent->message;
}
switch (message) {
case NS_MOUSE_SCROLL:
case NS_MOUSE_PIXEL_SCROLL:
if (sMouseMoved != 0 &&
OutOfTime(sMouseMoved, GetIgnoreMoveDelayTime())) {
// Terminate the current mousewheel transaction if the mouse moved more
// than ignoremovedelay milliseconds ago
EndTransaction();
}
return;
case NS_MOUSE_MOVE:
case NS_DRAGDROP_OVER:
if (IsMouseEventReal(aEvent)) {
// If the cursor is moving to be outside the frame,
// terminate the scrollwheel transaction.
nsIntPoint pt = GetScreenPoint((nsGUIEvent*)aEvent);
nsIntRect r = sTargetFrame->GetScreenRectExternal();
if (!r.Contains(pt)) {
EndTransaction();
return;
}
// If the cursor is moving inside the frame, and it is less than
// ignoremovedelay milliseconds since the last scroll operation, ignore
// the mouse move; otherwise, record the current mouse move time to be
// checked later
if (OutOfTime(sTime, GetIgnoreMoveDelayTime())) {
if (sMouseMoved == 0)
sMouseMoved = PR_IntervalToMilliseconds(PR_IntervalNow());
}
}
return;
case NS_KEY_PRESS:
case NS_KEY_UP:
case NS_KEY_DOWN:
case NS_MOUSE_BUTTON_UP:
case NS_MOUSE_BUTTON_DOWN:
case NS_MOUSE_DOUBLECLICK:
case NS_MOUSE_CLICK:
case NS_CONTEXTMENU:
case NS_DRAGDROP_DROP:
EndTransaction();
return;
}
}
void
nsMouseWheelTransaction::Shutdown()
{
NS_IF_RELEASE(sTimer);
}
void
nsMouseWheelTransaction::OnFailToScrollTarget()
{
NS_PRECONDITION(sTargetFrame, "We don't have mouse scrolling transaction");
if (Preferences::GetBool("test.mousescroll", false)) {
// This event is used for automated tests, see bug 442774.
nsContentUtils::DispatchTrustedEvent(
sTargetFrame->GetContent()->OwnerDoc(),
sTargetFrame->GetContent(),
NS_LITERAL_STRING("MozMouseScrollFailed"),
true, true);
}
// The target frame might be destroyed in the event handler, at that time,
// we need to finish the current transaction
if (!sTargetFrame)
EndTransaction();
}
void
nsMouseWheelTransaction::OnTimeout(nsITimer* aTimer, void* aClosure)
{
if (!sTargetFrame) {
// The transaction target was destroyed already
EndTransaction();
return;
}
// Store the sTargetFrame, the variable becomes null in EndTransaction.
nsIFrame* frame = sTargetFrame;
// We need to finish current transaction before DOM event firing. Because
// the next DOM event might create strange situation for us.
EndTransaction();
if (Preferences::GetBool("test.mousescroll", false)) {
// This event is used for automated tests, see bug 442774.
nsContentUtils::DispatchTrustedEvent(
frame->GetContent()->OwnerDoc(),
frame->GetContent(),
NS_LITERAL_STRING("MozMouseScrollTransactionTimeout"),
true, true);
}
}
void
nsMouseWheelTransaction::SetTimeout()
{
if (!sTimer) {
nsCOMPtr<nsITimer> timer = do_CreateInstance(NS_TIMER_CONTRACTID);
if (!timer)
return;
timer.swap(sTimer);
}
sTimer->Cancel();
#ifdef DEBUG
nsresult rv =
#endif
sTimer->InitWithFuncCallback(OnTimeout, nullptr, GetTimeoutTime(),
nsITimer::TYPE_ONE_SHOT);
NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "nsITimer::InitWithFuncCallback failed");
}
nsIntPoint
nsMouseWheelTransaction::GetScreenPoint(nsGUIEvent* aEvent)
{
NS_ASSERTION(aEvent, "aEvent is null");
NS_ASSERTION(aEvent->widget, "aEvent-widget is null");
return aEvent->refPoint + aEvent->widget->WidgetToScreenOffset();
}
PRUint32
nsMouseWheelTransaction::GetTimeoutTime()
{
return Preferences::GetUint("mousewheel.transaction.timeout", 1500);
}
PRUint32
nsMouseWheelTransaction::GetIgnoreMoveDelayTime()
{
return Preferences::GetUint("mousewheel.transaction.ignoremovedelay", 100);
}
bool
nsMouseWheelTransaction::IsAccelerationEnabled()
{
return GetAccelerationStart() >= 0 && GetAccelerationFactor() > 0;
}
PRInt32
nsMouseWheelTransaction::AccelerateWheelDelta(PRInt32 aScrollLines,
bool aIsHorizontal,
bool aAllowScrollSpeedOverride,
nsIScrollableFrame::ScrollUnit *aScrollQuantity,
bool aLimitToMaxOnePageScroll)
{
if (aAllowScrollSpeedOverride) {
aScrollLines = OverrideSystemScrollSpeed(aScrollLines, aIsHorizontal);
}
// Accelerate by the sScrollSeriesCounter
PRInt32 start = GetAccelerationStart();
if (start >= 0 && sScrollSeriesCounter >= start) {
PRInt32 factor = GetAccelerationFactor();
if (factor > 0) {
aScrollLines = ComputeAcceleratedWheelDelta(aScrollLines, factor);
}
}
// If the computed delta is larger than the page, we should limit
// the delta value to the one page size.
return !aLimitToMaxOnePageScroll ? aScrollLines :
LimitToOnePageScroll(aScrollLines, aIsHorizontal, aScrollQuantity);
}
PRInt32
nsMouseWheelTransaction::ComputeAcceleratedWheelDelta(PRInt32 aDelta,
PRInt32 aFactor)
{
if (aDelta == 0)
return 0;
return PRInt32(NS_round(aDelta * sScrollSeriesCounter *
(double)aFactor / 10));
}
PRInt32
nsMouseWheelTransaction::GetAccelerationStart()
{
return Preferences::GetInt("mousewheel.acceleration.start", -1);
}
PRInt32
nsMouseWheelTransaction::GetAccelerationFactor()
{
return Preferences::GetInt("mousewheel.acceleration.factor", -1);
}
PRInt32
nsMouseWheelTransaction::OverrideSystemScrollSpeed(PRInt32 aScrollLines,
bool aIsHorizontal)
{
NS_PRECONDITION(sTargetFrame, "We don't have mouse scrolling transaction");
if (aScrollLines == 0) {
return 0;
}
// We shouldn't override the scrolling speed on non root scroll frame.
if (sTargetFrame !=
sTargetFrame->PresContext()->PresShell()->GetRootScrollFrame()) {
return aScrollLines;
}
// Compute the overridden speed to nsIWidget. The widget can check the
// conditions (e.g., checking the prefs, and also whether the user customized
// the system settings of the mouse wheel scrolling or not), and can limit
// the speed for preventing the unexpected high speed scrolling.
nsCOMPtr<nsIWidget> widget(sTargetFrame->GetNearestWidget());
NS_ENSURE_TRUE(widget, aScrollLines);
PRInt32 overriddenDelta;
nsresult rv = widget->OverrideSystemMouseScrollSpeed(aScrollLines,
aIsHorizontal,
overriddenDelta);
NS_ENSURE_SUCCESS(rv, aScrollLines);
return overriddenDelta;
}
PRInt32
nsMouseWheelTransaction::LimitToOnePageScroll(PRInt32 aScrollLines,
bool aIsHorizontal,
nsIScrollableFrame::ScrollUnit *aScrollQuantity)
{
NS_ENSURE_TRUE(aScrollQuantity, aScrollLines);
NS_PRECONDITION(*aScrollQuantity == nsIScrollableFrame::LINES,
"aScrollQuantity isn't by line");
NS_ENSURE_TRUE(sTargetFrame, aScrollLines);
nsIScrollableFrame* sf = sTargetFrame->GetScrollTargetFrame();
NS_ENSURE_TRUE(sf, aScrollLines);
// Limit scrolling to be at most one page, but if possible, try to
// just adjust the number of scrolled lines.
nsSize lineAmount = sf->GetLineScrollAmount();
nscoord lineScroll = aIsHorizontal ? lineAmount.width : lineAmount.height;
if (lineScroll == 0)
return aScrollLines;
nsSize pageAmount = sf->GetPageScrollAmount();
nscoord pageScroll = aIsHorizontal ? pageAmount.width : pageAmount.height;
if (NS_ABS(aScrollLines) * lineScroll < pageScroll)
return aScrollLines;
nscoord maxLines = (pageScroll / lineScroll);
if (maxLines >= 1)
return ((aScrollLines < 0) ? -1 : 1) * maxLines;
*aScrollQuantity = nsIScrollableFrame::PAGES;
return (aScrollLines < 0) ? -1 : 1;
}
/******************************************************************/
/* nsEventStateManager */
/******************************************************************/
nsEventStateManager::nsEventStateManager()
: mLockCursor(0),
mPreLockPoint(0,0),
mCurrentTarget(nullptr),
mLastMouseOverFrame(nullptr),
// init d&d gesture state machine variables
mGestureDownPoint(0,0),
mPresContext(nullptr),
mLClickCount(0),
mMClickCount(0),
mRClickCount(0),
m_haveShutdown(false),
mLastLineScrollConsumedX(false),
mLastLineScrollConsumedY(false),
mClickHoldContextMenu(false)
{
if (sESMInstanceCount == 0) {
gUserInteractionTimerCallback = new nsUITimerCallback();
if (gUserInteractionTimerCallback)
NS_ADDREF(gUserInteractionTimerCallback);
UpdateUserActivityTimer();
}
++sESMInstanceCount;
}
nsresult
nsEventStateManager::UpdateUserActivityTimer(void)
{
if (!gUserInteractionTimerCallback)
return NS_OK;
if (!gUserInteractionTimer)
CallCreateInstance("@mozilla.org/timer;1", &gUserInteractionTimer);
if (gUserInteractionTimer) {
gUserInteractionTimer->InitWithCallback(gUserInteractionTimerCallback,
NS_USER_INTERACTION_INTERVAL,
nsITimer::TYPE_ONE_SHOT);
}
return NS_OK;
}
static const char* kObservedPrefs[] = {
"accessibility.accesskeycausesactivation",
"nglayout.events.dispatchLeftClickOnly",
"ui.key.generalAccessKey",
"ui.key.chromeAccess",
"ui.key.contentAccess",
"ui.click_hold_context_menus",
#if 0
"mousewheel.withaltkey.action",
"mousewheel.withaltkey.numlines",
"mousewheel.withaltkey.sysnumlines",
"mousewheel.withcontrolkey.action",
"mousewheel.withcontrolkey.numlines",
"mousewheel.withcontrolkey.sysnumlines",
"mousewheel.withnokey.action",
"mousewheel.withnokey.numlines",
"mousewheel.withnokey.sysnumlines",
"mousewheel.withshiftkey.action",
"mousewheel.withshiftkey.numlines",
"mousewheel.withshiftkey.sysnumlines",
#endif
"dom.popup_allowed_events",
nullptr
};
nsresult
nsEventStateManager::Init()
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return NS_ERROR_FAILURE;
observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
if (sESMInstanceCount == 1) {
sKeyCausesActivation =
Preferences::GetBool("accessibility.accesskeycausesactivation",
sKeyCausesActivation);
sLeftClickOnly =
Preferences::GetBool("nglayout.events.dispatchLeftClickOnly",
sLeftClickOnly);
sChromeAccessModifier =
GetAccessModifierMaskFromPref(nsIDocShellTreeItem::typeChrome);
sContentAccessModifier =
GetAccessModifierMaskFromPref(nsIDocShellTreeItem::typeContent);
}
Preferences::AddWeakObservers(this, kObservedPrefs);
mClickHoldContextMenu =
Preferences::GetBool("ui.click_hold_context_menus", false);
return NS_OK;
}
nsEventStateManager::~nsEventStateManager()
{
if (sActiveESM == this) {
sActiveESM = nullptr;
}
if (mClickHoldContextMenu)
KillClickHoldTimer();
if (mDocument == sMouseOverDocument)
sMouseOverDocument = nullptr;
--sESMInstanceCount;
if(sESMInstanceCount == 0) {
nsMouseWheelTransaction::Shutdown();
if (gUserInteractionTimerCallback) {
gUserInteractionTimerCallback->Notify(nullptr);
NS_RELEASE(gUserInteractionTimerCallback);
}
if (gUserInteractionTimer) {
gUserInteractionTimer->Cancel();
NS_RELEASE(gUserInteractionTimer);
}
}
if (sDragOverContent && sDragOverContent->OwnerDoc() == mDocument) {
sDragOverContent = nullptr;
}
if (!m_haveShutdown) {
Shutdown();
// Don't remove from Observer service in Shutdown because Shutdown also
// gets called from xpcom shutdown observer. And we don't want to remove
// from the service in that case.
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
}
}
}
nsresult
nsEventStateManager::Shutdown()
{
Preferences::RemoveObservers(this, kObservedPrefs);
m_haveShutdown = true;
return NS_OK;
}
NS_IMETHODIMP
nsEventStateManager::Observe(nsISupports *aSubject,
const char *aTopic,
const PRUnichar *someData)
{
if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID))
Shutdown();
else if (!nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
if (!someData)
return NS_OK;
nsDependentString data(someData);
if (data.EqualsLiteral("accessibility.accesskeycausesactivation")) {
sKeyCausesActivation =
Preferences::GetBool("accessibility.accesskeycausesactivation",
sKeyCausesActivation);
} else if (data.EqualsLiteral("nglayout.events.dispatchLeftClickOnly")) {
sLeftClickOnly =
Preferences::GetBool("nglayout.events.dispatchLeftClickOnly",
sLeftClickOnly);
} else if (data.EqualsLiteral("ui.key.generalAccessKey")) {
sChromeAccessModifier =
GetAccessModifierMaskFromPref(nsIDocShellTreeItem::typeChrome);
sContentAccessModifier =
GetAccessModifierMaskFromPref(nsIDocShellTreeItem::typeContent);
} else if (data.EqualsLiteral("ui.key.chromeAccess")) {
sChromeAccessModifier =
GetAccessModifierMaskFromPref(nsIDocShellTreeItem::typeChrome);
} else if (data.EqualsLiteral("ui.key.contentAccess")) {
sContentAccessModifier =
GetAccessModifierMaskFromPref(nsIDocShellTreeItem::typeContent);
} else if (data.EqualsLiteral("ui.click_hold_context_menus")) {
mClickHoldContextMenu =
Preferences::GetBool("ui.click_hold_context_menus", false);
#if 0
} else if (data.EqualsLiteral("mousewheel.withaltkey.action")) {
} else if (data.EqualsLiteral("mousewheel.withaltkey.numlines")) {
} else if (data.EqualsLiteral("mousewheel.withaltkey.sysnumlines")) {
} else if (data.EqualsLiteral("mousewheel.withcontrolkey.action")) {
} else if (data.EqualsLiteral("mousewheel.withcontrolkey.numlines")) {
} else if (data.EqualsLiteral("mousewheel.withcontrolkey.sysnumlines")) {
} else if (data.EqualsLiteral("mousewheel.withshiftkey.action")) {
} else if (data.EqualsLiteral("mousewheel.withshiftkey.numlines")) {
} else if (data.EqualsLiteral("mousewheel.withshiftkey.sysnumlines")) {
} else if (data.EqualsLiteral("mousewheel.withnokey.action")) {
} else if (data.EqualsLiteral("mousewheel.withnokey.numlines")) {
} else if (data.EqualsLiteral("mousewheel.withnokey.sysnumlines")) {
#endif
} else if (data.EqualsLiteral("dom.popup_allowed_events")) {
nsDOMEvent::PopupAllowedEventsChanged();
}
}
return NS_OK;
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsEventStateManager)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsEventStateManager)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsEventStateManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsEventStateManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsEventStateManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mCurrentTargetContent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLastMouseOverElement);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mGestureDownContent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mGestureDownFrameOwner);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLastLeftMouseDownContent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLastLeftMouseDownContentParent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLastMiddleMouseDownContent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLastMiddleMouseDownContentParent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLastRightMouseDownContent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLastRightMouseDownContentParent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mActiveContent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mHoverContent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mURLTargetContent);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mFirstMouseOverEventElement);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mFirstMouseOutEventElement);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mDocument);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMARRAY(mAccessKeys);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsEventStateManager)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mCurrentTargetContent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLastMouseOverElement);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mGestureDownContent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mGestureDownFrameOwner);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLastLeftMouseDownContent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLastLeftMouseDownContentParent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLastMiddleMouseDownContent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLastMiddleMouseDownContentParent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLastRightMouseDownContent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLastRightMouseDownContentParent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mActiveContent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mHoverContent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mURLTargetContent);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mFirstMouseOverEventElement);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mFirstMouseOutEventElement);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mDocument);
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMARRAY(mAccessKeys);
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
nsresult
nsEventStateManager::PreHandleEvent(nsPresContext* aPresContext,
nsEvent *aEvent,
nsIFrame* aTargetFrame,
nsEventStatus* aStatus)
{
NS_ENSURE_ARG_POINTER(aStatus);
NS_ENSURE_ARG(aPresContext);
if (!aEvent) {
NS_ERROR("aEvent is null. This should never happen.");
return NS_ERROR_NULL_POINTER;
}
mCurrentTarget = aTargetFrame;
mCurrentTargetContent = nullptr;
// Focus events don't necessarily need a frame.
if (NS_EVENT_NEEDS_FRAME(aEvent)) {
NS_ASSERTION(mCurrentTarget, "mCurrentTarget is null. this should not happen. see bug #13007");
if (!mCurrentTarget) return NS_ERROR_NULL_POINTER;
}
#ifdef DEBUG
if (NS_IS_DRAG_EVENT(aEvent) && sIsPointerLocked) {
NS_ASSERTION(sIsPointerLocked,
"sIsPointerLocked is true. Drag events should be suppressed when the pointer is locked.");
}
#endif
// Store last known screenPoint and clientPoint so pointer lock
// can use these values as constants.
if (NS_IS_TRUSTED_EVENT(aEvent) &&
((NS_IS_MOUSE_EVENT_STRUCT(aEvent) &&
IsMouseEventReal(aEvent)) ||
aEvent->eventStructType == NS_MOUSE_SCROLL_EVENT)) {
if (!sIsPointerLocked) {
sLastScreenPoint = nsDOMUIEvent::CalculateScreenPoint(aPresContext, aEvent);
sLastClientPoint = nsDOMUIEvent::CalculateClientPoint(aPresContext, aEvent, nullptr);
}
}
// Do not take account NS_MOUSE_ENTER/EXIT so that loading a page
// when user is not active doesn't change the state to active.
if (NS_IS_TRUSTED_EVENT(aEvent) &&
((aEvent->eventStructType == NS_MOUSE_EVENT &&
IsMouseEventReal(aEvent) &&
aEvent->message != NS_MOUSE_ENTER &&
aEvent->message != NS_MOUSE_EXIT) ||
aEvent->eventStructType == NS_MOUSE_SCROLL_EVENT ||
aEvent->eventStructType == NS_KEY_EVENT)) {
if (gMouseOrKeyboardEventCounter == 0) {
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (obs) {
obs->NotifyObservers(nullptr, "user-interaction-active", nullptr);
UpdateUserActivityTimer();
}
}
++gMouseOrKeyboardEventCounter;
}
*aStatus = nsEventStatus_eIgnore;
nsMouseWheelTransaction::OnEvent(aEvent);
switch (aEvent->message) {
case NS_MOUSE_BUTTON_DOWN:
switch (static_cast<nsMouseEvent*>(aEvent)->button) {
case nsMouseEvent::eLeftButton:
#ifndef XP_OS2
BeginTrackingDragGesture(aPresContext, (nsMouseEvent*)aEvent, aTargetFrame);
#endif
mLClickCount = ((nsMouseEvent*)aEvent)->clickCount;
SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
sNormalLMouseEventInProcess = true;
break;
case nsMouseEvent::eMiddleButton:
mMClickCount = ((nsMouseEvent*)aEvent)->clickCount;
SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
break;
case nsMouseEvent::eRightButton:
#ifdef XP_OS2
BeginTrackingDragGesture(aPresContext, (nsMouseEvent*)aEvent, aTargetFrame);
#endif
mRClickCount = ((nsMouseEvent*)aEvent)->clickCount;
SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
break;
}
break;
case NS_MOUSE_BUTTON_UP:
switch (static_cast<nsMouseEvent*>(aEvent)->button) {
case nsMouseEvent::eLeftButton:
if (mClickHoldContextMenu) {
KillClickHoldTimer();
}
#ifndef XP_OS2
StopTrackingDragGesture();
#endif
sNormalLMouseEventInProcess = false;
// then fall through...
case nsMouseEvent::eRightButton:
#ifdef XP_OS2
StopTrackingDragGesture();
#endif
// then fall through...
case nsMouseEvent::eMiddleButton:
SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
break;
}
break;
case NS_MOUSE_EXIT:
// If the event is not a top-level window exit, then it's not
// really an exit --- we may have traversed widget boundaries but
// we're still in our toplevel window.
{
nsMouseEvent* mouseEvent = static_cast<nsMouseEvent*>(aEvent);
if (mouseEvent->exit != nsMouseEvent::eTopLevel) {
// Treat it as a synthetic move so we don't generate spurious
// "exit" or "move" events. Any necessary "out" or "over" events
// will be generated by GenerateMouseEnterExit
mouseEvent->message = NS_MOUSE_MOVE;
mouseEvent->reason = nsMouseEvent::eSynthesized;
// then fall through...
} else {
GenerateMouseEnterExit((nsGUIEvent*)aEvent);
//This is a window level mouse exit event and should stop here
aEvent->message = 0;
break;
}
}
case NS_MOUSE_MOVE:
// on the Mac, GenerateDragGesture() may not return until the drag
// has completed and so |aTargetFrame| may have been deleted (moving
// a bookmark, for example). If this is the case, however, we know
// that ClearFrameRefs() has been called and it cleared out
// |mCurrentTarget|. As a result, we should pass |mCurrentTarget|
// into UpdateCursor().
GenerateDragGesture(aPresContext, (nsMouseEvent*)aEvent);
UpdateCursor(aPresContext, aEvent, mCurrentTarget, aStatus);
GenerateMouseEnterExit((nsGUIEvent*)aEvent);
// Flush pending layout changes, so that later mouse move events
// will go to the right nodes.
FlushPendingEvents(aPresContext);
break;
case NS_DRAGDROP_GESTURE:
if (mClickHoldContextMenu) {
// an external drag gesture event came in, not generated internally
// by Gecko. Make sure we get rid of the click-hold timer.
KillClickHoldTimer();
}
break;
case NS_DRAGDROP_OVER:
// NS_DRAGDROP_DROP is fired before NS_DRAGDROP_DRAGDROP so send
// the enter/exit events before NS_DRAGDROP_DROP.
GenerateDragDropEnterExit(aPresContext, (nsGUIEvent*)aEvent);
break;
case NS_KEY_PRESS:
{
nsKeyEvent* keyEvent = (nsKeyEvent*)aEvent;
PRInt32 modifierMask = 0;
if (keyEvent->IsShift())
modifierMask |= NS_MODIFIER_SHIFT;
if (keyEvent->IsControl())
modifierMask |= NS_MODIFIER_CONTROL;
if (keyEvent->IsAlt())
modifierMask |= NS_MODIFIER_ALT;
if (keyEvent->IsMeta())
modifierMask |= NS_MODIFIER_META;
if (keyEvent->IsOS())
modifierMask |= NS_MODIFIER_OS;
// Prevent keyboard scrolling while an accesskey modifier is in use.
if (modifierMask && (modifierMask == sChromeAccessModifier ||
modifierMask == sContentAccessModifier))
HandleAccessKey(aPresContext, keyEvent, aStatus, nullptr,
eAccessKeyProcessingNormal, modifierMask);
}
// then fall through...
case NS_KEY_DOWN:
case NS_KEY_UP:
{
nsIContent* content = GetFocusedContent();
if (content)
mCurrentTargetContent = content;
}
break;
case NS_MOUSE_SCROLL:
{
nsIContent* content = GetFocusedContent();
if (content)
mCurrentTargetContent = content;
nsMouseScrollEvent* msEvent = static_cast<nsMouseScrollEvent*>(aEvent);
msEvent->delta = ComputeWheelDeltaFor(msEvent);
}
break;
case NS_MOUSE_PIXEL_SCROLL:
{
nsIContent* content = GetFocusedContent();
if (content)
mCurrentTargetContent = content;
nsMouseScrollEvent *msEvent = static_cast<nsMouseScrollEvent*>(aEvent);
// Clear old deltas after a period of non action
if (OutOfTime(gPixelScrollDeltaTimeout, nsMouseWheelTransaction::GetTimeoutTime())) {
gPixelScrollDeltaX = gPixelScrollDeltaY = 0;
}
gPixelScrollDeltaTimeout = PR_IntervalToMilliseconds(PR_IntervalNow());
// If needed send a line scroll event for pixel scrolls with kNoLines
if (msEvent->scrollFlags & nsMouseScrollEvent::kNoLines) {
nscoord pixelHeight = aPresContext->AppUnitsToIntCSSPixels(
GetScrollableLineHeight(aTargetFrame));
if (msEvent->scrollFlags & nsMouseScrollEvent::kIsVertical) {
gPixelScrollDeltaX += msEvent->delta;
if (!gPixelScrollDeltaX || !pixelHeight)
break;
if (NS_ABS(gPixelScrollDeltaX) >= pixelHeight) {
PRInt32 numLines = (PRInt32)ceil((float)gPixelScrollDeltaX/(float)pixelHeight);
gPixelScrollDeltaX -= numLines*pixelHeight;
nsWeakFrame weakFrame(aTargetFrame);
SendLineScrollEvent(aTargetFrame, msEvent, aPresContext,
aStatus, numLines);
NS_ENSURE_STATE(weakFrame.IsAlive());
}
} else if (msEvent->scrollFlags & nsMouseScrollEvent::kIsHorizontal) {
gPixelScrollDeltaY += msEvent->delta;
if (!gPixelScrollDeltaY || !pixelHeight)
break;
if (NS_ABS(gPixelScrollDeltaY) >= pixelHeight) {
PRInt32 numLines = (PRInt32)ceil((float)gPixelScrollDeltaY/(float)pixelHeight);
gPixelScrollDeltaY -= numLines*pixelHeight;
nsWeakFrame weakFrame(aTargetFrame);
SendLineScrollEvent(aTargetFrame, msEvent, aPresContext,
aStatus, numLines);
NS_ENSURE_STATE(weakFrame.IsAlive());
}
}
}
// When the last line scroll has been canceled, eat the pixel scroll event
if ((msEvent->scrollFlags & nsMouseScrollEvent::kIsHorizontal) ?
mLastLineScrollConsumedX : mLastLineScrollConsumedY) {
*aStatus = nsEventStatus_eConsumeNoDefault;
}
}
break;
case NS_QUERY_SELECTED_TEXT:
DoQuerySelectedText(static_cast<nsQueryContentEvent*>(aEvent));
break;
case NS_QUERY_TEXT_CONTENT:
{
if (RemoteQueryContentEvent(aEvent))
break;
nsContentEventHandler handler(mPresContext);
handler.OnQueryTextContent((nsQueryContentEvent*)aEvent);
}
break;
case NS_QUERY_CARET_RECT:
{
// XXX remote event
nsContentEventHandler handler(mPresContext);
handler.OnQueryCaretRect((nsQueryContentEvent*)aEvent);
}
break;
case NS_QUERY_TEXT_RECT:
{
// XXX remote event
nsContentEventHandler handler(mPresContext);
handler.OnQueryTextRect((nsQueryContentEvent*)aEvent);
}
break;
case NS_QUERY_EDITOR_RECT:
{
// XXX remote event
nsContentEventHandler handler(mPresContext);
handler.OnQueryEditorRect((nsQueryContentEvent*)aEvent);
}
break;
case NS_QUERY_CONTENT_STATE:
{
// XXX remote event
nsContentEventHandler handler(mPresContext);
handler.OnQueryContentState(static_cast<nsQueryContentEvent*>(aEvent));
}
break;
case NS_QUERY_SELECTION_AS_TRANSFERABLE:
{
// XXX remote event
nsContentEventHandler handler(mPresContext);
handler.OnQuerySelectionAsTransferable(static_cast<nsQueryContentEvent*>(aEvent));
}
break;
case NS_QUERY_CHARACTER_AT_POINT:
{
// XXX remote event
nsContentEventHandler handler(mPresContext);
handler.OnQueryCharacterAtPoint(static_cast<nsQueryContentEvent*>(aEvent));
}
break;
case NS_QUERY_DOM_WIDGET_HITTEST:
{
// XXX remote event
nsContentEventHandler handler(mPresContext);
handler.OnQueryDOMWidgetHittest(static_cast<nsQueryContentEvent*>(aEvent));
}
break;
case NS_QUERY_SCROLL_TARGET_INFO:
{
DoQueryScrollTargetInfo(static_cast<nsQueryContentEvent*>(aEvent),
aTargetFrame);
break;
}
case NS_SELECTION_SET:
{
nsSelectionEvent *selectionEvent =
static_cast<nsSelectionEvent*>(aEvent);
if (IsTargetCrossProcess(selectionEvent)) {
// Will not be handled locally, remote the event
if (GetCrossProcessTarget()->SendSelectionEvent(*selectionEvent))
selectionEvent->mSucceeded = true;
break;
}
nsContentEventHandler handler(mPresContext);
handler.OnSelectionEvent((nsSelectionEvent*)aEvent);
}
break;
case NS_CONTENT_COMMAND_CUT:
case NS_CONTENT_COMMAND_COPY:
case NS_CONTENT_COMMAND_PASTE:
case NS_CONTENT_COMMAND_DELETE:
case NS_CONTENT_COMMAND_UNDO:
case NS_CONTENT_COMMAND_REDO:
case NS_CONTENT_COMMAND_PASTE_TRANSFERABLE:
{
DoContentCommandEvent(static_cast<nsContentCommandEvent*>(aEvent));
}
break;
case NS_CONTENT_COMMAND_SCROLL:
{
DoContentCommandScrollEvent(static_cast<nsContentCommandEvent*>(aEvent));
}
break;
case NS_TEXT_TEXT:
{
nsTextEvent *textEvent = static_cast<nsTextEvent*>(aEvent);
if (IsTargetCrossProcess(textEvent)) {
// Will not be handled locally, remote the event
if (GetCrossProcessTarget()->SendTextEvent(*textEvent)) {
// Cancel local dispatching
aEvent->flags |= NS_EVENT_FLAG_STOP_DISPATCH;
}
}
}
break;
case NS_COMPOSITION_START:
if (NS_IS_TRUSTED_EVENT(aEvent)) {
// If the event is trusted event, set the selected text to data of
// composition event.
nsCompositionEvent *compositionEvent =
static_cast<nsCompositionEvent*>(aEvent);
nsQueryContentEvent selectedText(true, NS_QUERY_SELECTED_TEXT,
compositionEvent->widget);
DoQuerySelectedText(&selectedText);
NS_ASSERTION(selectedText.mSucceeded, "Failed to get selected text");
compositionEvent->data = selectedText.mReply.mString;
}
// through to compositionend handling
case NS_COMPOSITION_UPDATE:
case NS_COMPOSITION_END:
{
nsCompositionEvent *compositionEvent =
static_cast<nsCompositionEvent*>(aEvent);
if (IsTargetCrossProcess(compositionEvent)) {
// Will not be handled locally, remote the event
if (GetCrossProcessTarget()->SendCompositionEvent(*compositionEvent)) {
// Cancel local dispatching
aEvent->flags |= NS_EVENT_FLAG_STOP_DISPATCH;
}
}
}
break;
}
return NS_OK;
}
static PRInt32
GetAccessModifierMask(nsISupports* aDocShell)
{
nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(aDocShell));
if (!treeItem)
return -1; // invalid modifier
PRInt32 itemType;
treeItem->GetItemType(&itemType);
switch (itemType) {
case nsIDocShellTreeItem::typeChrome:
return sChromeAccessModifier;
case nsIDocShellTreeItem::typeContent:
return sContentAccessModifier;
default:
return -1; // invalid modifier
}
}
static bool
IsAccessKeyTarget(nsIContent* aContent, nsIFrame* aFrame, nsAString& aKey)
{
if (!aContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::accesskey, aKey,
eIgnoreCase))
return false;
nsCOMPtr<nsIDOMXULDocument> xulDoc =
do_QueryInterface(aContent->OwnerDoc());
if (!xulDoc && !aContent->IsXUL())
return true;
// For XUL we do visibility checks.
if (!aFrame)
return false;
if (aFrame->IsFocusable())
return true;
if (!aFrame->IsVisibleConsideringAncestors())
return false;
// XUL controls can be activated.
nsCOMPtr<nsIDOMXULControlElement> control(do_QueryInterface(aContent));
if (control)
return true;
if (aContent->IsHTML()) {
nsIAtom* tag = aContent->Tag();
// HTML area, label and legend elements are never focusable, so
// we need to check for them explicitly before giving up.
if (tag == nsGkAtoms::area ||
tag == nsGkAtoms::label ||
tag == nsGkAtoms::legend)
return true;
} else if (aContent->IsXUL()) {
// XUL label elements are never focusable, so we need to check for them
// explicitly before giving up.
if (aContent->Tag() == nsGkAtoms::label)
return true;
}
return false;
}
bool
nsEventStateManager::ExecuteAccessKey(nsTArray<PRUint32>& aAccessCharCodes,
bool aIsTrustedEvent)
{
PRInt32 count, start = -1;
nsIContent* focusedContent = GetFocusedContent();
if (focusedContent) {
start = mAccessKeys.IndexOf(focusedContent);
if (start == -1 && focusedContent->GetBindingParent())
start = mAccessKeys.IndexOf(focusedContent->GetBindingParent());
}
nsIContent *content;
nsIFrame *frame;
PRInt32 length = mAccessKeys.Count();
for (PRUint32 i = 0; i < aAccessCharCodes.Length(); ++i) {
PRUint32 ch = aAccessCharCodes[i];
nsAutoString accessKey;
AppendUCS4ToUTF16(ch, accessKey);
for (count = 1; count <= length; ++count) {
content = mAccessKeys[(start + count) % length];
frame = content->GetPrimaryFrame();
if (IsAccessKeyTarget(content, frame, accessKey)) {
bool shouldActivate = sKeyCausesActivation;
while (shouldActivate && ++count <= length) {
nsIContent *oc = mAccessKeys[(start + count) % length];
nsIFrame *of = oc->GetPrimaryFrame();
if (IsAccessKeyTarget(oc, of, accessKey))
shouldActivate = false;
}
if (shouldActivate)
content->PerformAccesskey(shouldActivate, aIsTrustedEvent);
else {
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm) {
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(content);
fm->SetFocus(element, nsIFocusManager::FLAG_BYKEY);
}
}
return true;
}
}
}
return false;
}
bool
nsEventStateManager::GetAccessKeyLabelPrefix(nsAString& aPrefix)
{
aPrefix.Truncate();
nsAutoString separator, modifierText;
nsContentUtils::GetModifierSeparatorText(separator);
nsCOMPtr<nsISupports> container = mPresContext->GetContainer();
PRInt32 modifier = GetAccessModifierMask(container);
if (modifier & NS_MODIFIER_CONTROL) {
nsContentUtils::GetControlText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifier & NS_MODIFIER_META) {
nsContentUtils::GetMetaText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifier & NS_MODIFIER_OS) {
nsContentUtils::GetOSText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifier & NS_MODIFIER_ALT) {
nsContentUtils::GetAltText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifier & NS_MODIFIER_SHIFT) {
nsContentUtils::GetShiftText(modifierText);
aPrefix.Append(modifierText + separator);
}
return !aPrefix.IsEmpty();
}
void
nsEventStateManager::HandleAccessKey(nsPresContext* aPresContext,
nsKeyEvent *aEvent,
nsEventStatus* aStatus,
nsIDocShellTreeItem* aBubbledFrom,
ProcessingAccessKeyState aAccessKeyState,
PRInt32 aModifierMask)
{
nsCOMPtr<nsISupports> pcContainer = aPresContext->GetContainer();
// Alt or other accesskey modifier is down, we may need to do an accesskey
if (mAccessKeys.Count() > 0 &&
aModifierMask == GetAccessModifierMask(pcContainer)) {
// Someone registered an accesskey. Find and activate it.
bool isTrusted = NS_IS_TRUSTED_EVENT(aEvent);
nsAutoTArray<PRUint32, 10> accessCharCodes;
nsContentUtils::GetAccessKeyCandidates(aEvent, accessCharCodes);
if (ExecuteAccessKey(accessCharCodes, isTrusted)) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
// after the local accesskey handling
if (nsEventStatus_eConsumeNoDefault != *aStatus) {
// checking all sub docshells
nsCOMPtr<nsIDocShellTreeNode> docShell(do_QueryInterface(pcContainer));
if (!docShell) {
NS_WARNING("no docShellTreeNode for presContext");
return;
}
PRInt32 childCount;
docShell->GetChildCount(&childCount);
for (PRInt32 counter = 0; counter < childCount; counter++) {
// Not processing the child which bubbles up the handling
nsCOMPtr<nsIDocShellTreeItem> subShellItem;
docShell->GetChildAt(counter, getter_AddRefs(subShellItem));
if (aAccessKeyState == eAccessKeyProcessingUp &&
subShellItem == aBubbledFrom)
continue;
nsCOMPtr<nsIDocShell> subDS = do_QueryInterface(subShellItem);
if (subDS && IsShellVisible(subDS)) {
nsCOMPtr<nsIPresShell> subPS;
subDS->GetPresShell(getter_AddRefs(subPS));
// Docshells need not have a presshell (eg. display:none
// iframes, docshells in transition between documents, etc).
if (!subPS) {
// Oh, well. Just move on to the next child
continue;
}
nsPresContext *subPC = subPS->GetPresContext();
nsEventStateManager* esm =
static_cast<nsEventStateManager *>(subPC->EventStateManager());
if (esm)
esm->HandleAccessKey(subPC, aEvent, aStatus, nullptr,
eAccessKeyProcessingDown, aModifierMask);
if (nsEventStatus_eConsumeNoDefault == *aStatus)
break;
}
}
}// if end . checking all sub docshell ends here.
// bubble up the process to the parent docshell if necessary
if (eAccessKeyProcessingDown != aAccessKeyState && nsEventStatus_eConsumeNoDefault != *aStatus) {
nsCOMPtr<nsIDocShellTreeItem> docShell(do_QueryInterface(pcContainer));
if (!docShell) {
NS_WARNING("no docShellTreeItem for presContext");
return;
}
nsCOMPtr<nsIDocShellTreeItem> parentShellItem;
docShell->GetParent(getter_AddRefs(parentShellItem));
nsCOMPtr<nsIDocShell> parentDS = do_QueryInterface(parentShellItem);
if (parentDS) {
nsCOMPtr<nsIPresShell> parentPS;
parentDS->GetPresShell(getter_AddRefs(parentPS));
NS_ASSERTION(parentPS, "Our PresShell exists but the parent's does not?");
nsPresContext *parentPC = parentPS->GetPresContext();
NS_ASSERTION(parentPC, "PresShell without PresContext");
nsEventStateManager* esm =
static_cast<nsEventStateManager *>(parentPC->EventStateManager());
if (esm)
esm->HandleAccessKey(parentPC, aEvent, aStatus, docShell,
eAccessKeyProcessingUp, aModifierMask);
}
}// if end. bubble up process
}// end of HandleAccessKey
bool
nsEventStateManager::DispatchCrossProcessEvent(nsEvent* aEvent,
nsFrameLoader* aFrameLoader,
nsEventStatus *aStatus) {
PBrowserParent* remoteBrowser = aFrameLoader->GetRemoteBrowser();
TabParent* remote = static_cast<TabParent*>(remoteBrowser);
if (!remote) {
return false;
}
switch (aEvent->eventStructType) {
case NS_MOUSE_EVENT: {
nsMouseEvent* mouseEvent = static_cast<nsMouseEvent*>(aEvent);
return remote->SendRealMouseEvent(*mouseEvent);
}
case NS_KEY_EVENT: {
nsKeyEvent* keyEvent = static_cast<nsKeyEvent*>(aEvent);
return remote->SendRealKeyEvent(*keyEvent);
}
case NS_MOUSE_SCROLL_EVENT: {
nsMouseScrollEvent* scrollEvent = static_cast<nsMouseScrollEvent*>(aEvent);
return remote->SendMouseScrollEvent(*scrollEvent);
}
case NS_TOUCH_EVENT: {
// Let the child process synthesize a mouse event if needed, and
// ensure we don't synthesize one in this process.
*aStatus = nsEventStatus_eConsumeNoDefault;
nsTouchEvent* touchEvent = static_cast<nsTouchEvent*>(aEvent);
return remote->SendRealTouchEvent(*touchEvent);
}
default: {
MOZ_NOT_REACHED("Attempt to send non-whitelisted event?");
return false;
}
}
}
bool
nsEventStateManager::IsRemoteTarget(nsIContent* target) {
if (!target) {
return false;
}
// <browser/iframe remote=true> from XUL
if ((target->Tag() == nsGkAtoms::browser ||
target->Tag() == nsGkAtoms::iframe) &&
target->IsXUL() &&
target->AttrValueIs(kNameSpaceID_None, nsGkAtoms::Remote,
nsGkAtoms::_true, eIgnoreCase)) {
return true;
}
// <frame/iframe mozbrowser>
nsCOMPtr<nsIMozBrowserFrame> browserFrame = do_QueryInterface(target);
if (browserFrame) {
bool isBrowser = false;
browserFrame->GetReallyIsBrowser(&isBrowser);
if (isBrowser) {
return !!TabParent::GetFrom(target);
}
}
return false;
}
bool
CrossProcessSafeEvent(const nsEvent& aEvent)
{
switch (aEvent.eventStructType) {
case NS_KEY_EVENT:
case NS_MOUSE_SCROLL_EVENT:
return true;
case NS_MOUSE_EVENT:
switch (aEvent.message) {
case NS_MOUSE_BUTTON_DOWN:
case NS_MOUSE_BUTTON_UP:
case NS_MOUSE_MOVE:
return true;
default:
return false;
}
case NS_TOUCH_EVENT:
switch (aEvent.message) {
case NS_TOUCH_START:
case NS_TOUCH_MOVE:
case NS_TOUCH_END:
case NS_TOUCH_CANCEL:
return true;
default:
return false;
}
default:
return false;
}
}
bool
nsEventStateManager::HandleCrossProcessEvent(nsEvent *aEvent,
nsIFrame* aTargetFrame,
nsEventStatus *aStatus) {
if (*aStatus == nsEventStatus_eConsumeNoDefault ||
aEvent->flags & NS_EVENT_FLAG_DONT_FORWARD_CROSS_PROCESS ||
!CrossProcessSafeEvent(*aEvent)) {
return false;
}
// Collect the remote event targets we're going to forward this
// event to.
//
// NB: the elements of |targets| must be unique, for correctness.
nsAutoTArray<nsCOMPtr<nsIContent>, 1> targets;
if (aEvent->eventStructType != NS_TOUCH_EVENT ||
aEvent->message == NS_TOUCH_START) {
// If this event only has one target, and it's remote, add it to
// the array.
nsIContent* target = mCurrentTargetContent;
if (!target && aTargetFrame) {
target = aTargetFrame->GetContent();
}
if (IsRemoteTarget(target)) {
targets.AppendElement(target);
}
} else {
// This is a touch event with possibly multiple touch points.
// Each touch point may have its own target. So iterate through
// all of them and collect the unique set of targets for event
// forwarding.
//
// This loop is similar to the one used in
// PresShell::DispatchTouchEvent().
nsTouchEvent* touchEvent = static_cast<nsTouchEvent*>(aEvent);
const nsTArray<nsCOMPtr<nsIDOMTouch> >& touches = touchEvent->touches;
for (PRUint32 i = 0; i < touches.Length(); ++i) {
nsIDOMTouch* touch = touches[i];
// NB: the |mChanged| check is an optimization, subprocesses can
// compute this for themselves. If the touch hasn't changed, we
// may be able to avoid forwarding the event entirely (which is
// not free).
if (!touch || !touch->mChanged) {
continue;
}
nsCOMPtr<nsIDOMEventTarget> targetPtr;
touch->GetTarget(getter_AddRefs(targetPtr));
if (!targetPtr) {
continue;
}
nsCOMPtr<nsIContent> target = do_QueryInterface(targetPtr);
if (IsRemoteTarget(target) && !targets.Contains(target)) {
targets.AppendElement(target);
}
}
}
if (targets.Length() == 0) {
return false;
}
// Look up the frame loader for all the remote targets we found, and
// then dispatch the event to the remote content they represent.
bool dispatched = false;
for (PRUint32 i = 0; i < targets.Length(); ++i) {
nsIContent* target = targets[i];
nsCOMPtr<nsIFrameLoaderOwner> loaderOwner = do_QueryInterface(target);
if (!loaderOwner) {
continue;
}
nsRefPtr<nsFrameLoader> frameLoader = loaderOwner->GetFrameLoader();
if (!frameLoader) {
continue;
}
PRUint32 eventMode;
frameLoader->GetEventMode(&eventMode);
if (eventMode == nsIFrameLoader::EVENT_MODE_DONT_FORWARD_TO_CHILD) {
continue;
}
// The "toplevel widget" in content processes is always at position
// 0,0. Map the event coordinates to match that.
if (aEvent->eventStructType != NS_TOUCH_EVENT) {
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
aTargetFrame);
aEvent->refPoint =
pt.ToNearestPixels(mPresContext->AppUnitsPerDevPixel());
} else {
nsIFrame* targetFrame = frameLoader->GetPrimaryFrameOfOwningContent();
aEvent->refPoint = nsIntPoint();
// Find out how far we're offset from the nearest widget.
nsPoint offset =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, targetFrame);
nsIntPoint intOffset =
offset.ToNearestPixels(mPresContext->AppUnitsPerDevPixel());
nsTouchEvent* touchEvent = static_cast<nsTouchEvent*>(aEvent);
// Then offset all the touch points by that distance, to put them
// in the space where top-left is 0,0.
const nsTArray<nsCOMPtr<nsIDOMTouch> >& touches = touchEvent->touches;
for (PRUint32 i = 0; i < touches.Length(); ++i) {
nsIDOMTouch* touch = touches[i];
if (touch) {
touch->mRefPoint += intOffset;
}
}
}
dispatched |= DispatchCrossProcessEvent(aEvent, frameLoader, aStatus);
}
return dispatched;
}
//
// CreateClickHoldTimer
//
// Fire off a timer for determining if the user wants click-hold. This timer
// is a one-shot that will be cancelled when the user moves enough to fire
// a drag.
//
void
nsEventStateManager::CreateClickHoldTimer(nsPresContext* inPresContext,
nsIFrame* inDownFrame,
nsGUIEvent* inMouseDownEvent)
{
if (!NS_IS_TRUSTED_EVENT(inMouseDownEvent))
return;
// just to be anal (er, safe)
if (mClickHoldTimer) {
mClickHoldTimer->Cancel();
mClickHoldTimer = nullptr;
}
// if content clicked on has a popup, don't even start the timer
// since we'll end up conflicting and both will show.
if (mGestureDownContent) {
// check for the |popup| attribute
if (nsContentUtils::HasNonEmptyAttr(mGestureDownContent, kNameSpaceID_None,
nsGkAtoms::popup))
return;
// check for a <menubutton> like bookmarks
if (mGestureDownContent->Tag() == nsGkAtoms::menubutton)
return;
}
mClickHoldTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mClickHoldTimer) {
PRInt32 clickHoldDelay =
Preferences::GetInt("ui.click_hold_context_menus.delay", 500);
mClickHoldTimer->InitWithFuncCallback(sClickHoldCallback, this,
clickHoldDelay,
nsITimer::TYPE_ONE_SHOT);
}
} // CreateClickHoldTimer
//
// KillClickHoldTimer
//
// Stop the timer that would show the context menu dead in its tracks
//
void
nsEventStateManager::KillClickHoldTimer()
{
if (mClickHoldTimer) {
mClickHoldTimer->Cancel();
mClickHoldTimer = nullptr;
}
}
//
// sClickHoldCallback
//
// This fires after the mouse has been down for a certain length of time.
//
void
nsEventStateManager::sClickHoldCallback(nsITimer *aTimer, void* aESM)
{
nsEventStateManager* self = static_cast<nsEventStateManager*>(aESM);
if (self)
self->FireContextClick();
// NOTE: |aTimer| and |self->mAutoHideTimer| are invalid after calling ClosePopup();
} // sAutoHideCallback
//
// FireContextClick
//
// If we're this far, our timer has fired, which means the mouse has been down
// for a certain period of time and has not moved enough to generate a dragGesture.
// We can be certain the user wants a context-click at this stage, so generate
// a dom event and fire it in.
//
// After the event fires, check if PreventDefault() has been set on the event which
// means that someone either ate the event or put up a context menu. This is our cue
// to stop tracking the drag gesture. If we always did this, draggable items w/out
// a context menu wouldn't be draggable after a certain length of time, which is
// _not_ what we want.
//
void
nsEventStateManager::FireContextClick()
{
if (!mGestureDownContent)
return;
#ifdef XP_MACOSX
// Hack to ensure that we don't show a context menu when the user
// let go of the mouse after a long cpu-hogging operation prevented
// us from handling any OS events. See bug 117589.
if (!CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState, kCGMouseButtonLeft))
return;
#endif
nsEventStatus status = nsEventStatus_eIgnore;
// Dispatch to the DOM. We have to fake out the ESM and tell it that the
// current target frame is actually where the mouseDown occurred, otherwise it
// will use the frame the mouse is currently over which may or may not be
// the same. (Note: saari and I have decided that we don't have to reset |mCurrentTarget|
// when we're through because no one else is doing anything more with this
// event and it will get reset on the very next event to the correct frame).
mCurrentTarget = mPresContext->GetPrimaryFrameFor(mGestureDownContent);
if (mCurrentTarget) {
NS_ASSERTION(mPresContext == mCurrentTarget->PresContext(),
"a prescontext returned a primary frame that didn't belong to it?");
// before dispatching, check that we're not on something that
// doesn't get a context menu
nsIAtom *tag = mGestureDownContent->Tag();
bool allowedToDispatch = true;
if (mGestureDownContent->IsXUL()) {
if (tag == nsGkAtoms::scrollbar ||
tag == nsGkAtoms::scrollbarbutton ||
tag == nsGkAtoms::button)
allowedToDispatch = false;
else if (tag == nsGkAtoms::toolbarbutton) {
// a <toolbarbutton> that has the container attribute set
// will already have its own dropdown.
if (nsContentUtils::HasNonEmptyAttr(mGestureDownContent,
kNameSpaceID_None, nsGkAtoms::container)) {
allowedToDispatch = false;
} else {
// If the toolbar button has an open menu, don't attempt to open
// a second menu
if (mGestureDownContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::open,
nsGkAtoms::_true, eCaseMatters)) {
allowedToDispatch = false;
}
}
}
}
else if (mGestureDownContent->IsHTML()) {
nsCOMPtr<nsIFormControl> formCtrl(do_QueryInterface(mGestureDownContent));
if (formCtrl) {
// of all form controls, only ones dealing with text are
// allowed to have context menus
PRInt32 type = formCtrl->GetType();
allowedToDispatch = (type == NS_FORM_INPUT_TEXT ||
type == NS_FORM_INPUT_EMAIL ||
type == NS_FORM_INPUT_SEARCH ||
type == NS_FORM_INPUT_TEL ||
type == NS_FORM_INPUT_URL ||
type == NS_FORM_INPUT_PASSWORD ||
type == NS_FORM_INPUT_FILE ||
type == NS_FORM_INPUT_NUMBER ||
type == NS_FORM_TEXTAREA);
}
else if (tag == nsGkAtoms::applet ||
tag == nsGkAtoms::embed ||
tag == nsGkAtoms::object) {
allowedToDispatch = false;
}
}
if (allowedToDispatch) {
// make sure the widget sticks around
nsCOMPtr<nsIWidget> targetWidget(mCurrentTarget->GetNearestWidget());
// init the event while mCurrentTarget is still good
nsMouseEvent event(true, NS_CONTEXTMENU,
targetWidget,
nsMouseEvent::eReal);
event.clickCount = 1;
FillInEventFromGestureDown(&event);
// stop selection tracking, we're in control now
if (mCurrentTarget)
{
nsRefPtr<nsFrameSelection> frameSel =
mCurrentTarget->GetFrameSelection();
if (frameSel && frameSel->GetMouseDownState()) {
// note that this can cause selection changed events to fire if we're in
// a text field, which will null out mCurrentTarget
frameSel->SetMouseDownState(false);
}
}
// dispatch to DOM
nsEventDispatcher::Dispatch(mGestureDownContent, mPresContext, &event,
nullptr, &status);
// We don't need to dispatch to frame handling because no frames
// watch NS_CONTEXTMENU except for nsMenuFrame and that's only for
// dismissal. That's just as well since we don't really know
// which frame to send it to.
}
}
// now check if the event has been handled. If so, stop tracking a drag
if (status == nsEventStatus_eConsumeNoDefault) {
StopTrackingDragGesture();
}
KillClickHoldTimer();
} // FireContextClick
//
// BeginTrackingDragGesture
//
// Record that the mouse has gone down and that we should move to TRACKING state
// of d&d gesture tracker.
//
// We also use this to track click-hold context menus. When the mouse goes down,
// fire off a short timer. If the timer goes off and we have yet to fire the
// drag gesture (ie, the mouse hasn't moved a certain distance), then we can
// assume the user wants a click-hold, so fire a context-click event. We only
// want to cancel the drag gesture if the context-click event is handled.
//
void
nsEventStateManager::BeginTrackingDragGesture(nsPresContext* aPresContext,
nsMouseEvent* inDownEvent,
nsIFrame* inDownFrame)
{
if (!inDownEvent->widget)
return;
// Note that |inDownEvent| could be either a mouse down event or a
// synthesized mouse move event.
mGestureDownPoint = inDownEvent->refPoint +
inDownEvent->widget->WidgetToScreenOffset();
inDownFrame->GetContentForEvent(inDownEvent,
getter_AddRefs(mGestureDownContent));
mGestureDownFrameOwner = inDownFrame->GetContent();
mGestureModifiers = inDownEvent->modifiers;
mGestureDownButtons = inDownEvent->buttons;
if (mClickHoldContextMenu) {
// fire off a timer to track click-hold
CreateClickHoldTimer(aPresContext, inDownFrame, inDownEvent);
}
}
//
// StopTrackingDragGesture
//
// Record that the mouse has gone back up so that we should leave the TRACKING
// state of d&d gesture tracker and return to the START state.
//
void
nsEventStateManager::StopTrackingDragGesture()
{
mGestureDownContent = nullptr;
mGestureDownFrameOwner = nullptr;
}
void
nsEventStateManager::FillInEventFromGestureDown(nsMouseEvent* aEvent)
{
NS_ASSERTION(aEvent->widget == mCurrentTarget->GetNearestWidget(),
"Incorrect widget in event");
// Set the coordinates in the new event to the coordinates of
// the old event, adjusted for the fact that the widget might be
// different
nsIntPoint tmpPoint = aEvent->widget->WidgetToScreenOffset();
aEvent->refPoint = mGestureDownPoint - tmpPoint;
aEvent->modifiers = mGestureModifiers;
aEvent->buttons = mGestureDownButtons;
}
//
// GenerateDragGesture
//
// If we're in the TRACKING state of the d&d gesture tracker, check the current position
// of the mouse in relation to the old one. If we've moved a sufficient amount from
// the mouse down, then fire off a drag gesture event.
void
nsEventStateManager::GenerateDragGesture(nsPresContext* aPresContext,
nsMouseEvent *aEvent)
{
NS_ASSERTION(aPresContext, "This shouldn't happen.");
if (IsTrackingDragGesture()) {
mCurrentTarget = mGestureDownFrameOwner->GetPrimaryFrame();
if (!mCurrentTarget) {
StopTrackingDragGesture();
return;
}
// Check if selection is tracking drag gestures, if so
// don't interfere!
if (mCurrentTarget)
{
nsRefPtr<nsFrameSelection> frameSel = mCurrentTarget->GetFrameSelection();
if (frameSel && frameSel->GetMouseDownState()) {
StopTrackingDragGesture();
return;
}
}
// If non-native code is capturing the mouse don't start a drag.
if (nsIPresShell::IsMouseCapturePreventingDrag()) {
StopTrackingDragGesture();
return;
}
static PRInt32 pixelThresholdX = 0;
static PRInt32 pixelThresholdY = 0;
if (!pixelThresholdX) {
pixelThresholdX =
LookAndFeel::GetInt(LookAndFeel::eIntID_DragThresholdX, 0);
pixelThresholdY =
LookAndFeel::GetInt(LookAndFeel::eIntID_DragThresholdY, 0);
if (!pixelThresholdX)
pixelThresholdX = 5;
if (!pixelThresholdY)
pixelThresholdY = 5;
}
// fire drag gesture if mouse has moved enough
nsIntPoint pt = aEvent->refPoint + aEvent->widget->WidgetToScreenOffset();
if (NS_ABS(pt.x - mGestureDownPoint.x) > pixelThresholdX ||
NS_ABS(pt.y - mGestureDownPoint.y) > pixelThresholdY) {
if (mClickHoldContextMenu) {
// stop the click-hold before we fire off the drag gesture, in case
// it takes a long time
KillClickHoldTimer();
}
nsRefPtr<nsDOMDataTransfer> dataTransfer = new nsDOMDataTransfer();
if (!dataTransfer)
return;
nsCOMPtr<nsISelection> selection;
nsCOMPtr<nsIContent> eventContent, targetContent;
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(eventContent));
if (eventContent)
DetermineDragTarget(aPresContext, eventContent, dataTransfer,
getter_AddRefs(selection), getter_AddRefs(targetContent));
// Stop tracking the drag gesture now. This should stop us from
// reentering GenerateDragGesture inside DOM event processing.
StopTrackingDragGesture();
if (!targetContent)
return;
sLastDragOverFrame = nullptr;
nsCOMPtr<nsIWidget> widget = mCurrentTarget->GetNearestWidget();
// get the widget from the target frame
nsDragEvent startEvent(NS_IS_TRUSTED_EVENT(aEvent), NS_DRAGDROP_START, widget);
FillInEventFromGestureDown(&startEvent);
nsDragEvent gestureEvent(NS_IS_TRUSTED_EVENT(aEvent), NS_DRAGDROP_GESTURE, widget);
FillInEventFromGestureDown(&gestureEvent);
startEvent.dataTransfer = gestureEvent.dataTransfer = dataTransfer;
startEvent.inputSource = gestureEvent.inputSource = aEvent->inputSource;
// Dispatch to the DOM. By setting mCurrentTarget we are faking
// out the ESM and telling it that the current target frame is
// actually where the mouseDown occurred, otherwise it will use
// the frame the mouse is currently over which may or may not be
// the same. (Note: saari and I have decided that we don't have
// to reset |mCurrentTarget| when we're through because no one
// else is doing anything more with this event and it will get
// reset on the very next event to the correct frame).
// Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
// Set the current target to the content for the mouse down
mCurrentTargetContent = targetContent;
// Dispatch both the dragstart and draggesture events to the DOM. For
// elements in an editor, only fire the draggesture event so that the
// editor code can handle it but content doesn't see a dragstart.
nsEventStatus status = nsEventStatus_eIgnore;
nsEventDispatcher::Dispatch(targetContent, aPresContext, &startEvent, nullptr,
&status);
nsDragEvent* event = &startEvent;
if (status != nsEventStatus_eConsumeNoDefault) {
status = nsEventStatus_eIgnore;
nsEventDispatcher::Dispatch(targetContent, aPresContext, &gestureEvent, nullptr,
&status);
event = &gestureEvent;
}
// now that the dataTransfer has been updated in the dragstart and
// draggesture events, make it read only so that the data doesn't
// change during the drag.
dataTransfer->SetReadOnly();
if (status != nsEventStatus_eConsumeNoDefault) {
bool dragStarted = DoDefaultDragStart(aPresContext, event, dataTransfer,
targetContent, selection);
if (dragStarted) {
sActiveESM = nullptr;
aEvent->flags |= NS_EVENT_FLAG_STOP_DISPATCH;
}
}
// Note that frame event handling doesn't care about NS_DRAGDROP_GESTURE,
// which is just as well since we don't really know which frame to
// send it to
// Reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
}
// Now flush all pending notifications, for better responsiveness
// while dragging.
FlushPendingEvents(aPresContext);
}
} // GenerateDragGesture
void
nsEventStateManager::DetermineDragTarget(nsPresContext* aPresContext,
nsIContent* aSelectionTarget,
nsDOMDataTransfer* aDataTransfer,
nsISelection** aSelection,
nsIContent** aTargetNode)
{
*aTargetNode = nullptr;
nsCOMPtr<nsISupports> container = aPresContext->GetContainer();
nsCOMPtr<nsIDOMWindow> window = do_GetInterface(container);
if (!window)
return;
// GetDragData determines if a selection, link or image in the content
// should be dragged, and places the data associated with the drag in the
// data transfer.
// mGestureDownContent is the node where the mousedown event for the drag
// occurred, and aSelectionTarget is the node to use when a selection is used
bool canDrag;
nsCOMPtr<nsIContent> dragDataNode;
bool wasAlt = (mGestureModifiers & widget::MODIFIER_ALT) != 0;
nsresult rv = nsContentAreaDragDrop::GetDragData(window, mGestureDownContent,
aSelectionTarget, wasAlt,
aDataTransfer, &canDrag, aSelection,
getter_AddRefs(dragDataNode));
if (NS_FAILED(rv) || !canDrag)
return;
// if GetDragData returned a node, use that as the node being dragged.
// Otherwise, if a selection is being dragged, use the node within the
// selection that was dragged. Otherwise, just use the mousedown target.
nsIContent* dragContent = mGestureDownContent;
if (dragDataNode)
dragContent = dragDataNode;
else if (*aSelection)
dragContent = aSelectionTarget;
nsIContent* originalDragContent = dragContent;
// If a selection isn't being dragged, look for an ancestor with the
// draggable property set. If one is found, use that as the target of the
// drag instead of the node that was clicked on. If a draggable node wasn't
// found, just use the clicked node.
if (!*aSelection) {
while (dragContent) {
nsCOMPtr<nsIDOMHTMLElement> htmlElement = do_QueryInterface(dragContent);
if (htmlElement) {
bool draggable = false;
htmlElement->GetDraggable(&draggable);
if (draggable)
break;
}
else {
nsCOMPtr<nsIDOMXULElement> xulElement = do_QueryInterface(dragContent);
if (xulElement) {
// All XUL elements are draggable, so if a XUL element is
// encountered, stop looking for draggable nodes and just use the
// original clicked node instead.
// XXXndeakin
// In the future, we will want to improve this so that XUL has a
// better way to specify whether something is draggable than just
// on/off.
dragContent = mGestureDownContent;
break;
}
// otherwise, it's not an HTML or XUL element, so just keep looking
}
dragContent = dragContent->GetParent();
}
}
// if no node in the hierarchy was found to drag, but the GetDragData method
// returned a node, use that returned node. Otherwise, nothing is draggable.
if (!dragContent && dragDataNode)
dragContent = dragDataNode;
if (dragContent) {
// if an ancestor node was used instead, clear the drag data
// XXXndeakin rework this a bit. Find a way to just not call GetDragData if we don't need to.
if (dragContent != originalDragContent)
aDataTransfer->ClearAll();
*aTargetNode = dragContent;
NS_ADDREF(*aTargetNode);
}
}
bool
nsEventStateManager::DoDefaultDragStart(nsPresContext* aPresContext,
nsDragEvent* aDragEvent,
nsDOMDataTransfer* aDataTransfer,
nsIContent* aDragTarget,
nsISelection* aSelection)
{
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
if (!dragService)
return false;
// Default handling for the draggesture/dragstart event.
//
// First, check if a drag session already exists. This means that the drag
// service was called directly within a draggesture handler. In this case,
// don't do anything more, as it is assumed that the handler is managing
// drag and drop manually. Make sure to return true to indicate that a drag
// began.
nsCOMPtr<nsIDragSession> dragSession;
dragService->GetCurrentSession(getter_AddRefs(dragSession));
if (dragSession)
return true;
// No drag session is currently active, so check if a handler added
// any items to be dragged. If not, there isn't anything to drag.
PRUint32 count = 0;
if (aDataTransfer)
aDataTransfer->GetMozItemCount(&count);
if (!count)
return false;
// Get the target being dragged, which may not be the same as the
// target of the mouse event. If one wasn't set in the
// aDataTransfer during the event handler, just use the original
// target instead.
nsCOMPtr<nsIDOMNode> dragTarget;
nsCOMPtr<nsIDOMElement> dragTargetElement;
aDataTransfer->GetDragTarget(getter_AddRefs(dragTargetElement));
dragTarget = do_QueryInterface(dragTargetElement);
if (!dragTarget) {
dragTarget = do_QueryInterface(aDragTarget);
if (!dragTarget)
return false;
}
// check which drag effect should initially be used. If the effect was not
// set, just use all actions, otherwise Windows won't allow a drop.
PRUint32 action;
aDataTransfer->GetEffectAllowedInt(&action);
if (action == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED)
action = nsIDragService::DRAGDROP_ACTION_COPY |
nsIDragService::DRAGDROP_ACTION_MOVE |
nsIDragService::DRAGDROP_ACTION_LINK;
// get any custom drag image that was set
PRInt32 imageX, imageY;
nsIDOMElement* dragImage = aDataTransfer->GetDragImage(&imageX, &imageY);
nsCOMPtr<nsISupportsArray> transArray;
aDataTransfer->GetTransferables(getter_AddRefs(transArray), dragTarget);
if (!transArray)
return false;
// XXXndeakin don't really want to create a new drag DOM event
// here, but we need something to pass to the InvokeDragSession
// methods.
nsCOMPtr<nsIDOMEvent> domEvent;
NS_NewDOMDragEvent(getter_AddRefs(domEvent), aPresContext, aDragEvent);
nsCOMPtr<nsIDOMDragEvent> domDragEvent = do_QueryInterface(domEvent);
// if creating a drag event failed, starting a drag session will
// just fail.
// Use InvokeDragSessionWithSelection if a selection is being dragged,
// such that the image can be generated from the selected text. However,
// use InvokeDragSessionWithImage if a custom image was set or something
// other than a selection is being dragged.
if (!dragImage && aSelection) {
dragService->InvokeDragSessionWithSelection(aSelection, transArray,
action, domDragEvent,
aDataTransfer);
}
else {
// if dragging within a XUL tree and no custom drag image was
// set, the region argument to InvokeDragSessionWithImage needs
// to be set to the area encompassing the selected rows of the
// tree to ensure that the drag feedback gets clipped to those
// rows. For other content, region should be null.
nsCOMPtr<nsIScriptableRegion> region;
#ifdef MOZ_XUL
if (dragTarget && !dragImage) {
nsCOMPtr<nsIContent> content = do_QueryInterface(dragTarget);
if (content->NodeInfo()->Equals(nsGkAtoms::treechildren,
kNameSpaceID_XUL)) {
nsTreeBodyFrame* treeBody = do_QueryFrame(content->GetPrimaryFrame());
if (treeBody) {
treeBody->GetSelectionRegion(getter_AddRefs(region));
}
}
}
#endif
dragService->InvokeDragSessionWithImage(dragTarget, transArray,
region, action, dragImage,
imageX, imageY, domDragEvent,
aDataTransfer);
}
return true;
}
nsresult
nsEventStateManager::GetMarkupDocumentViewer(nsIMarkupDocumentViewer** aMv)
{
*aMv = nullptr;
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if(!fm) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMWindow> focusedWindow;
fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
nsCOMPtr<nsPIDOMWindow> ourWindow = do_QueryInterface(focusedWindow);
if(!ourWindow) return NS_ERROR_FAILURE;
nsIDOMWindow *rootWindow = ourWindow->GetPrivateRoot();
if(!rootWindow) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMWindow> contentWindow;
rootWindow->GetContent(getter_AddRefs(contentWindow));
if(!contentWindow) return NS_ERROR_FAILURE;
nsIDocument *doc = GetDocumentFromWindow(contentWindow);
if(!doc) return NS_ERROR_FAILURE;
nsIPresShell *presShell = doc->GetShell();
if(!presShell) return NS_ERROR_FAILURE;
nsPresContext *presContext = presShell->GetPresContext();
if(!presContext) return NS_ERROR_FAILURE;
nsCOMPtr<nsISupports> pcContainer = presContext->GetContainer();
if(!pcContainer) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDocShell> docshell(do_QueryInterface(pcContainer));
if(!docshell) return NS_ERROR_FAILURE;
nsCOMPtr<nsIContentViewer> cv;
docshell->GetContentViewer(getter_AddRefs(cv));
if(!cv) return NS_ERROR_FAILURE;
nsCOMPtr<nsIMarkupDocumentViewer> mv(do_QueryInterface(cv));
if(!mv) return NS_ERROR_FAILURE;
*aMv = mv;
NS_IF_ADDREF(*aMv);
return NS_OK;
}
nsresult
nsEventStateManager::ChangeTextSize(PRInt32 change)
{
nsCOMPtr<nsIMarkupDocumentViewer> mv;
nsresult rv = GetMarkupDocumentViewer(getter_AddRefs(mv));
NS_ENSURE_SUCCESS(rv, rv);
float textzoom;
float zoomMin = ((float)Preferences::GetInt("zoom.minPercent", 50)) / 100;
float zoomMax = ((float)Preferences::GetInt("zoom.maxPercent", 300)) / 100;
mv->GetTextZoom(&textzoom);
textzoom += ((float)change) / 10;
if (textzoom < zoomMin)
textzoom = zoomMin;
else if (textzoom > zoomMax)
textzoom = zoomMax;
mv->SetTextZoom(textzoom);
return NS_OK;
}
nsresult
nsEventStateManager::ChangeFullZoom(PRInt32 change)
{
nsCOMPtr<nsIMarkupDocumentViewer> mv;
nsresult rv = GetMarkupDocumentViewer(getter_AddRefs(mv));
NS_ENSURE_SUCCESS(rv, rv);
float fullzoom;
float zoomMin = ((float)Preferences::GetInt("zoom.minPercent", 50)) / 100;
float zoomMax = ((float)Preferences::GetInt("zoom.maxPercent", 300)) / 100;
mv->GetFullZoom(&fullzoom);
fullzoom += ((float)change) / 10;
if (fullzoom < zoomMin)
fullzoom = zoomMin;
else if (fullzoom > zoomMax)
fullzoom = zoomMax;
mv->SetFullZoom(fullzoom);
return NS_OK;
}
void
nsEventStateManager::DoScrollHistory(PRInt32 direction)
{
nsCOMPtr<nsISupports> pcContainer(mPresContext->GetContainer());
if (pcContainer) {
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(pcContainer));
if (webNav) {
// positive direction to go back one step, nonpositive to go forward
if (direction > 0)
webNav->GoBack();
else
webNav->GoForward();
}
}
}
void
nsEventStateManager::DoScrollZoom(nsIFrame *aTargetFrame,
PRInt32 adjustment)
{
// Exclude form controls and XUL content.
nsIContent *content = aTargetFrame->GetContent();
if (content &&
!content->IsNodeOfType(nsINode::eHTML_FORM_CONTROL) &&
!content->IsXUL())
{
// positive adjustment to decrease zoom, negative to increase
PRInt32 change = (adjustment > 0) ? -1 : 1;
if (Preferences::GetBool("browser.zoom.full") || content->GetCurrentDoc()->IsSyntheticDocument()) {
ChangeFullZoom(change);
} else {
ChangeTextSize(change);
}
}
}
static nsIFrame*
GetParentFrameToScroll(nsIFrame* aFrame)
{
if (!aFrame)
return nullptr;
if (aFrame->GetStyleDisplay()->mPosition == NS_STYLE_POSITION_FIXED &&
nsLayoutUtils::IsReallyFixedPos(aFrame))
return aFrame->PresContext()->GetPresShell()->GetRootScrollFrame();
return aFrame->GetParent();
}
static nscoord
GetScrollableLineHeight(nsIFrame* aTargetFrame)
{
for (nsIFrame* f = aTargetFrame; f; f = GetParentFrameToScroll(f)) {
nsIScrollableFrame* sf = f->GetScrollTargetFrame();
if (sf)
return sf->GetLineScrollAmount().height;
}
// Fall back to the font height of the target frame.
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(aTargetFrame, getter_AddRefs(fm),
nsLayoutUtils::FontSizeInflationFor(aTargetFrame));
NS_ASSERTION(fm, "FontMetrics is null!");
if (fm)
return fm->MaxHeight();
return 0;
}
void
nsEventStateManager::SendLineScrollEvent(nsIFrame* aTargetFrame,
nsMouseScrollEvent* aEvent,
nsPresContext* aPresContext,
nsEventStatus* aStatus,
PRInt32 aNumLines)
{
nsCOMPtr<nsIContent> targetContent = aTargetFrame->GetContent();
if (!targetContent)
targetContent = GetFocusedContent();
if (!targetContent)
return;
while (targetContent->IsNodeOfType(nsINode::eTEXT)) {
targetContent = targetContent->GetParent();
}
bool isTrusted = (aEvent->flags & NS_EVENT_FLAG_TRUSTED) != 0;
nsMouseScrollEvent event(isTrusted, NS_MOUSE_SCROLL, nullptr);
event.refPoint = aEvent->refPoint;
event.widget = aEvent->widget;
event.time = aEvent->time;
event.modifiers = aEvent->modifiers;
event.buttons = aEvent->buttons;
event.scrollFlags = aEvent->scrollFlags;
event.delta = aNumLines;
event.inputSource = static_cast<nsMouseEvent_base*>(aEvent)->inputSource;
nsEventDispatcher::Dispatch(targetContent, aPresContext, &event, nullptr, aStatus);
}
void
nsEventStateManager::SendPixelScrollEvent(nsIFrame* aTargetFrame,
nsMouseScrollEvent* aEvent,
nsPresContext* aPresContext,
nsEventStatus* aStatus)
{
nsCOMPtr<nsIContent> targetContent = aTargetFrame->GetContent();
if (!targetContent) {
targetContent = GetFocusedContent();
if (!targetContent)
return;
}
while (targetContent->IsNodeOfType(nsINode::eTEXT)) {
targetContent = targetContent->GetParent();
}
nscoord lineHeight = GetScrollableLineHeight(aTargetFrame);
bool isTrusted = (aEvent->flags & NS_EVENT_FLAG_TRUSTED) != 0;
nsMouseScrollEvent event(isTrusted, NS_MOUSE_PIXEL_SCROLL, nullptr);
event.refPoint = aEvent->refPoint;
event.widget = aEvent->widget;
event.time = aEvent->time;
event.modifiers = aEvent->modifiers;
event.buttons = aEvent->buttons;
event.scrollFlags = aEvent->scrollFlags;
event.inputSource = static_cast<nsMouseEvent_base*>(aEvent)->inputSource;
event.delta = aPresContext->AppUnitsToIntCSSPixels(aEvent->delta * lineHeight);
nsEventDispatcher::Dispatch(targetContent, aPresContext, &event, nullptr, aStatus);
}
PRInt32
nsEventStateManager::ComputeWheelDeltaFor(nsMouseScrollEvent* aMouseEvent)
{
PRInt32 delta = aMouseEvent->delta;
bool useSysNumLines = UseSystemScrollSettingFor(aMouseEvent);
if (!useSysNumLines) {
// If the scroll event's delta isn't to our liking, we can
// override it with the "numlines" parameter. There are two
// things we can do:
//
// (1) Pick a different number. Instead of scrolling 3
// lines ("delta" in Gtk2), we would scroll 1 line.
// (2) Swap directions. Instead of scrolling down, scroll up.
//
// For the first item, the magnitude of the parameter is
// used instead of the magnitude of the delta. For the
// second item, if the parameter is negative we swap
// directions.
PRInt32 numLines = GetScrollLinesFor(aMouseEvent);
bool swapDirs = (numLines < 0);
PRInt32 userSize = swapDirs ? -numLines : numLines;
bool deltaUp = (delta < 0);
if (swapDirs) {
deltaUp = !deltaUp;
}
delta = deltaUp ? -userSize : userSize;
}
if (ComputeWheelActionFor(aMouseEvent, useSysNumLines) == MOUSE_SCROLL_PAGE) {
delta = (delta > 0) ? PRInt32(nsIDOMUIEvent::SCROLL_PAGE_DOWN) :
PRInt32(nsIDOMUIEvent::SCROLL_PAGE_UP);
}
return delta;
}
PRInt32
nsEventStateManager::ComputeWheelActionFor(nsMouseScrollEvent* aMouseEvent,
bool aUseSystemSettings)
{
PRInt32 action = GetWheelActionFor(aMouseEvent);
if (aUseSystemSettings &&
(aMouseEvent->scrollFlags & nsMouseScrollEvent::kIsFullPage)) {
action = MOUSE_SCROLL_PAGE;
}
if (aMouseEvent->message == NS_MOUSE_PIXEL_SCROLL) {
if (action == MOUSE_SCROLL_N_LINES || action == MOUSE_SCROLL_PAGE ||
(aMouseEvent->scrollFlags & nsMouseScrollEvent::kIsMomentum)) {
action = MOUSE_SCROLL_PIXELS;
} else {
// Do not scroll pixels when zooming
action = -1;
}
} else if (((aMouseEvent->scrollFlags & nsMouseScrollEvent::kHasPixels) &&
(aUseSystemSettings ||
action == MOUSE_SCROLL_N_LINES || action == MOUSE_SCROLL_PAGE)) ||
((aMouseEvent->scrollFlags & nsMouseScrollEvent::kIsMomentum) &&
(action == MOUSE_SCROLL_HISTORY || action == MOUSE_SCROLL_ZOOM))) {
// Don't scroll lines or page when a pixel scroll event will follow.
// Also, don't do history scrolling or zooming for momentum scrolls,
// no matter what's going on with pixel scrolling.
action = -1;
}
return action;
}
PRInt32
nsEventStateManager::GetWheelActionFor(nsMouseScrollEvent* aMouseEvent)
{
nsCAutoString prefName;
GetBasePrefKeyForMouseWheel(aMouseEvent, prefName);
prefName.Append(".action");
return Preferences::GetInt(prefName.get());
}
PRInt32
nsEventStateManager::GetScrollLinesFor(nsMouseScrollEvent* aMouseEvent)
{
NS_ASSERTION(!UseSystemScrollSettingFor(aMouseEvent),
"GetScrollLinesFor() called when should use system settings");
nsCAutoString prefName;
GetBasePrefKeyForMouseWheel(aMouseEvent, prefName);
prefName.Append(".numlines");
return Preferences::GetInt(prefName.get());
}
bool
nsEventStateManager::UseSystemScrollSettingFor(nsMouseScrollEvent* aMouseEvent)
{
nsCAutoString prefName;
GetBasePrefKeyForMouseWheel(aMouseEvent, prefName);
prefName.Append(".sysnumlines");
return Preferences::GetBool(prefName.get());
}
nsresult
nsEventStateManager::DoScrollText(nsIFrame* aTargetFrame,
nsMouseScrollEvent* aMouseEvent,
nsIScrollableFrame::ScrollUnit aScrollQuantity,
bool aAllowScrollSpeedOverride,
nsQueryContentEvent* aQueryEvent,
nsIAtom *aOrigin)
{
nsIScrollableFrame* frameToScroll = nullptr;
nsIFrame* scrollFrame = aTargetFrame;
PRInt32 numLines = aMouseEvent->delta;
bool isHorizontal = aMouseEvent->scrollFlags & nsMouseScrollEvent::kIsHorizontal;
aMouseEvent->scrollOverflow = 0;
// If the user recently scrolled with the mousewheel, then they probably want
// to scroll the same view as before instead of the view under the cursor.
// nsMouseWheelTransaction tracks the frame currently being scrolled with the
// mousewheel. We consider the transaction ended when the mouse moves more than
// "mousewheel.transaction.ignoremovedelay" milliseconds after the last scroll
// operation, or any time the mouse moves out of the frame, or when more than
// "mousewheel.transaction.timeout" milliseconds have passed after the last
// operation, even if the mouse hasn't moved.
nsIFrame* lastScrollFrame = nsMouseWheelTransaction::GetTargetFrame();
if (lastScrollFrame) {
frameToScroll = lastScrollFrame->GetScrollTargetFrame();
if (frameToScroll) {
nsMouseWheelTransaction::UpdateTransaction(numLines, isHorizontal);
// When the scroll event will not scroll any views, UpdateTransaction
// fired MozMouseScrollFailed event which is for automated testing.
// In the event handler, the target frame might be destroyed. Then,
// we should not keep handling this scroll event.
if (!nsMouseWheelTransaction::GetTargetFrame())
return NS_OK;
} else {
nsMouseWheelTransaction::EndTransaction();
lastScrollFrame = nullptr;
}
}
bool passToParent = lastScrollFrame ? false : true;
for (; scrollFrame && passToParent;
scrollFrame = GetParentFrameToScroll(scrollFrame)) {
// Check whether the frame wants to provide us with a scrollable view.
frameToScroll = scrollFrame->GetScrollTargetFrame();
if (!frameToScroll) {
continue;
}
nsPresContext::ScrollbarStyles ss = frameToScroll->GetScrollbarStyles();
if (NS_STYLE_OVERFLOW_HIDDEN ==
(isHorizontal ? ss.mHorizontal : ss.mVertical)) {
continue;
}
// Check if the scrollable view can be scrolled any further.
nscoord lineHeight = frameToScroll->GetLineScrollAmount().height;
if (lineHeight != 0) {
if (CanScrollOn(frameToScroll, numLines, isHorizontal)) {
passToParent = false;
nsMouseWheelTransaction::BeginTransaction(scrollFrame,
numLines, isHorizontal);
}
// Comboboxes need special care.
nsIComboboxControlFrame* comboBox = do_QueryFrame(scrollFrame);
if (comboBox) {
if (comboBox->IsDroppedDown()) {
// Don't propagate to parent when drop down menu is active.
if (passToParent) {
passToParent = false;
frameToScroll = nullptr;
nsMouseWheelTransaction::EndTransaction();
}
} else {
// Always propagate when not dropped down (even if focused).
if (!passToParent) {
passToParent = true;
nsMouseWheelTransaction::EndTransaction();
}
}
}
}
}
if (!passToParent && frameToScroll) {
if (aScrollQuantity == nsIScrollableFrame::LINES) {
// When this is called for querying the scroll target information,
// we shouldn't limit the scrolling amount to less one page.
// Otherwise, we shouldn't scroll more one page at once.
numLines =
nsMouseWheelTransaction::AccelerateWheelDelta(numLines, isHorizontal,
aAllowScrollSpeedOverride,
&aScrollQuantity,
!aQueryEvent);
}
#ifdef DEBUG
else {
NS_ASSERTION(!aAllowScrollSpeedOverride,
"aAllowScrollSpeedOverride is true but the quantity isn't by-line scrolling.");
}
#endif
if (aScrollQuantity == nsIScrollableFrame::PAGES) {
numLines = (numLines > 0) ? 1 : -1;
}
if (aQueryEvent) {
// If acceleration is enabled, pixel scroll shouldn't be used for
// high resolution scrolling.
if (nsMouseWheelTransaction::IsAccelerationEnabled()) {
return NS_OK;
}
nscoord appUnitsPerDevPixel =
aTargetFrame->PresContext()->AppUnitsPerDevPixel();
aQueryEvent->mReply.mLineHeight =
frameToScroll->GetLineScrollAmount().height / appUnitsPerDevPixel;
aQueryEvent->mReply.mPageHeight =
frameToScroll->GetPageScrollAmount().height / appUnitsPerDevPixel;
aQueryEvent->mReply.mPageWidth =
frameToScroll->GetPageScrollAmount().width / appUnitsPerDevPixel;
// Returns computed numLines to widget which is needed to compute the
// pixel scrolling amout for high resolution scrolling.
aQueryEvent->mReply.mComputedScrollAmount = numLines;
switch (aScrollQuantity) {
case nsIScrollableFrame::LINES:
aQueryEvent->mReply.mComputedScrollAction =
nsQueryContentEvent::SCROLL_ACTION_LINE;
break;
case nsIScrollableFrame::PAGES:
aQueryEvent->mReply.mComputedScrollAction =
nsQueryContentEvent::SCROLL_ACTION_PAGE;
break;
default:
aQueryEvent->mReply.mComputedScrollAction =
nsQueryContentEvent::SCROLL_ACTION_NONE;
break;
}
aQueryEvent->mSucceeded = true;
return NS_OK;
}
PRInt32 scrollX = 0;
PRInt32 scrollY = numLines;
if (isHorizontal) {
scrollX = scrollY;
scrollY = 0;
}
nsIScrollableFrame::ScrollMode mode;
if (aMouseEvent->scrollFlags & nsMouseScrollEvent::kNoDefer) {
mode = nsIScrollableFrame::INSTANT;
} else if (aScrollQuantity != nsIScrollableFrame::DEVICE_PIXELS ||
(aMouseEvent->scrollFlags &
nsMouseScrollEvent::kAllowSmoothScroll) != 0) {
mode = nsIScrollableFrame::SMOOTH;
} else {
mode = nsIScrollableFrame::NORMAL;
}
// XXX Why don't we limit the pixel scroll amount to less one page??
nsIntPoint overflow;
frameToScroll->ScrollBy(nsIntPoint(scrollX, scrollY), aScrollQuantity,
mode, &overflow, aOrigin);
aMouseEvent->scrollOverflow = isHorizontal ? overflow.x : overflow.y;
return NS_OK;
}
if (passToParent) {
nsIFrame* newFrame = nsLayoutUtils::GetCrossDocParentFrame(
aTargetFrame->PresContext()->FrameManager()->GetRootFrame());
if (newFrame)
return DoScrollText(newFrame, aMouseEvent, aScrollQuantity,
aAllowScrollSpeedOverride, aQueryEvent, aOrigin);
}
aMouseEvent->scrollOverflow = numLines;
return NS_OK;
}
void
nsEventStateManager::DecideGestureEvent(nsGestureNotifyEvent* aEvent,
nsIFrame* targetFrame)
{
NS_ASSERTION(aEvent->message == NS_GESTURENOTIFY_EVENT_START,
"DecideGestureEvent called with a non-gesture event");
/* Check the ancestor tree to decide if any frame is willing* to receive
* a MozPixelScroll event. If that's the case, the current touch gesture
* will be used as a pan gesture; otherwise it will be a regular
* mousedown/mousemove/click event.
*
* *willing: determine if it makes sense to pan the element using scroll events:
* - For web content: if there are any visible scrollbars on the touch point
* - For XUL: if it's an scrollable element that can currently scroll in some
* direction.
*
* Note: we'll have to one-off various cases to ensure a good usable behavior
*/
nsGestureNotifyEvent::ePanDirection panDirection = nsGestureNotifyEvent::ePanNone;
bool displayPanFeedback = false;
for (nsIFrame* current = targetFrame; current;
current = nsLayoutUtils::GetCrossDocParentFrame(current)) {
nsIAtom* currentFrameType = current->GetType();
// Scrollbars should always be draggable
if (currentFrameType == nsGkAtoms::scrollbarFrame) {
panDirection = nsGestureNotifyEvent::ePanNone;
break;
}
#ifdef MOZ_XUL
// Special check for trees
nsTreeBodyFrame* treeFrame = do_QueryFrame(current);
if (treeFrame) {
if (treeFrame->GetHorizontalOverflow()) {
panDirection = nsGestureNotifyEvent::ePanHorizontal;
}
if (treeFrame->GetVerticalOverflow()) {
panDirection = nsGestureNotifyEvent::ePanVertical;
}
break;
}
#endif
nsIScrollableFrame* scrollableFrame = do_QueryFrame(current);
if (scrollableFrame) {
if (current->IsFrameOfType(nsIFrame::eXULBox)) {
displayPanFeedback = true;
nsRect scrollRange = scrollableFrame->GetScrollRange();
bool canScrollHorizontally = scrollRange.width > 0;
if (targetFrame->GetType() == nsGkAtoms::menuFrame) {
// menu frames report horizontal scroll when they have submenus
// and we don't want that
canScrollHorizontally = false;
displayPanFeedback = false;
}
// Vertical panning has priority over horizontal panning, so
// when vertical movement is possible we can just finish the loop.
if (scrollRange.height > 0) {
panDirection = nsGestureNotifyEvent::ePanVertical;
break;
}
if (canScrollHorizontally) {
panDirection = nsGestureNotifyEvent::ePanHorizontal;
displayPanFeedback = false;
}
} else { //Not a XUL box
PRUint32 scrollbarVisibility = scrollableFrame->GetScrollbarVisibility();
//Check if we have visible scrollbars
if (scrollbarVisibility & nsIScrollableFrame::VERTICAL) {
panDirection = nsGestureNotifyEvent::ePanVertical;
displayPanFeedback = true;
break;
}
if (scrollbarVisibility & nsIScrollableFrame::HORIZONTAL) {
panDirection = nsGestureNotifyEvent::ePanHorizontal;
displayPanFeedback = true;
}
}
} //scrollableFrame
} //ancestor chain
aEvent->displayPanFeedback = displayPanFeedback;
aEvent->panDirection = panDirection;
}
#ifdef XP_MACOSX
static bool
NodeAllowsClickThrough(nsINode* aNode)
{
while (aNode) {
if (aNode->IsElement() && aNode->AsElement()->IsXUL()) {
mozilla::dom::Element* element = aNode->AsElement();
static nsIContent::AttrValuesArray strings[] =
{&nsGkAtoms::always, &nsGkAtoms::never, nullptr};
switch (element->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::clickthrough,
strings, eCaseMatters)) {
case 0:
return true;
case 1:
return false;
}
}
aNode = nsContentUtils::GetCrossDocParentNode(aNode);
}
return true;
}
#endif
nsresult
nsEventStateManager::PostHandleEvent(nsPresContext* aPresContext,
nsEvent *aEvent,
nsIFrame* aTargetFrame,
nsEventStatus* aStatus)
{
NS_ENSURE_ARG(aPresContext);
NS_ENSURE_ARG_POINTER(aStatus);
HandleCrossProcessEvent(aEvent, aTargetFrame, aStatus);
mCurrentTarget = aTargetFrame;
mCurrentTargetContent = nullptr;
// Most of the events we handle below require a frame.
// Add special cases here.
if (!mCurrentTarget && aEvent->message != NS_MOUSE_BUTTON_UP &&
aEvent->message != NS_MOUSE_BUTTON_DOWN) {
return NS_OK;
}
//Keep the prescontext alive, we might need it after event dispatch
nsRefPtr<nsPresContext> presContext = aPresContext;
nsresult ret = NS_OK;
switch (aEvent->message) {
case NS_MOUSE_BUTTON_DOWN:
{
if (static_cast<nsMouseEvent*>(aEvent)->button == nsMouseEvent::eLeftButton &&
!sNormalLMouseEventInProcess) {
// We got a mouseup event while a mousedown event was being processed.
// Make sure that the capturing content is cleared.
nsIPresShell::SetCapturingContent(nullptr, 0);
break;
}
nsCOMPtr<nsIContent> activeContent;
if (nsEventStatus_eConsumeNoDefault != *aStatus) {
nsCOMPtr<nsIContent> newFocus;
bool suppressBlur = false;
if (mCurrentTarget) {
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(newFocus));
const nsStyleUserInterface* ui = mCurrentTarget->GetStyleUserInterface();
suppressBlur = (ui->mUserFocus == NS_STYLE_USER_FOCUS_IGNORE);
activeContent = mCurrentTarget->GetContent();
}
nsIFrame* currFrame = mCurrentTarget;
// When a root content which isn't editable but has an editable HTML
// <body> element is clicked, we should redirect the focus to the
// the <body> element. E.g., when an user click bottom of the editor
// where is outside of the <body> element, the <body> should be focused
// and the user can edit immediately after that.
//
// NOTE: The newFocus isn't editable that also means it's not in
// designMode. In designMode, all contents are not focusable.
if (newFocus && !newFocus->IsEditable()) {
nsIDocument *doc = newFocus->GetCurrentDoc();
if (doc && newFocus == doc->GetRootElement()) {
nsIContent *bodyContent =
nsLayoutUtils::GetEditableRootContentByContentEditable(doc);
if (bodyContent) {
nsIFrame* bodyFrame = bodyContent->GetPrimaryFrame();
if (bodyFrame) {
currFrame = bodyFrame;
newFocus = bodyContent;
}
}
}
}
// When the mouse is pressed, the default action is to focus the
// target. Look for the nearest enclosing focusable frame.
while (currFrame) {
// If the mousedown happened inside a popup, don't
// try to set focus on one of its containing elements
const nsStyleDisplay* display = currFrame->GetStyleDisplay();
if (display->mDisplay == NS_STYLE_DISPLAY_POPUP) {
newFocus = nullptr;
break;
}
PRInt32 tabIndexUnused;
if (currFrame->IsFocusable(&tabIndexUnused, true)) {
newFocus = currFrame->GetContent();
nsCOMPtr<nsIDOMElement> domElement(do_QueryInterface(newFocus));
if (domElement)
break;
}
currFrame = currFrame->GetParent();
}
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm) {
// if something was found to focus, focus it. Otherwise, if the
// element that was clicked doesn't have -moz-user-focus: ignore,
// clear the existing focus. For -moz-user-focus: ignore, the focus
// is just left as is.
// Another effect of mouse clicking, handled in nsSelection, is that
// it should update the caret position to where the mouse was
// clicked. Because the focus is cleared when clicking on a
// non-focusable node, the next press of the tab key will cause
// focus to be shifted from the caret position instead of the root.
if (newFocus && currFrame) {
// use the mouse flag and the noscroll flag so that the content
// doesn't unexpectedly scroll when clicking an element that is
// only hald visible
nsCOMPtr<nsIDOMElement> newFocusElement = do_QueryInterface(newFocus);
fm->SetFocus(newFocusElement, nsIFocusManager::FLAG_BYMOUSE |
nsIFocusManager::FLAG_NOSCROLL);
}
else if (!suppressBlur) {
// clear the focus within the frame and then set it as the
// focused frame
EnsureDocument(mPresContext);
if (mDocument) {
#ifdef XP_MACOSX
if (!activeContent || !activeContent->IsXUL())
#endif
fm->ClearFocus(mDocument->GetWindow());
fm->SetFocusedWindow(mDocument->GetWindow());
}
}
}
// The rest is left button-specific.
if (static_cast<nsMouseEvent*>(aEvent)->button !=
nsMouseEvent::eLeftButton)
break;
if (activeContent) {
// The nearest enclosing element goes into the
// :active state. If we fail the QI to DOMElement,
// then we know we're only a node, and that we need
// to obtain our parent element and put it into :active
// instead.
nsCOMPtr<nsIDOMElement> elt(do_QueryInterface(activeContent));
if (!elt) {
nsIContent* par = activeContent->GetParent();
if (par)
activeContent = par;
}
}
}
else {
// if we're here, the event handler returned false, so stop
// any of our own processing of a drag. Workaround for bug 43258.
StopTrackingDragGesture();
// When the event was cancelled, there is currently a chrome document
// focused and a mousedown just occurred on a content document, ensure
// that the window that was clicked is focused.
EnsureDocument(mPresContext);
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (mDocument && fm) {
nsCOMPtr<nsIDOMWindow> currentWindow;
fm->GetFocusedWindow(getter_AddRefs(currentWindow));
if (currentWindow && currentWindow != mDocument->GetWindow() &&
!nsContentUtils::IsChromeDoc(mDocument)) {
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(currentWindow);
nsCOMPtr<nsIDocument> currentDoc = do_QueryInterface(win->GetExtantDocument());
if (nsContentUtils::IsChromeDoc(currentDoc)) {
fm->SetFocusedWindow(mDocument->GetWindow());
}
}
}
}
SetActiveManager(this, activeContent);
}
break;
case NS_MOUSE_BUTTON_UP:
{
ClearGlobalActiveContent(this);
if (IsMouseEventReal(aEvent)) {
if (!mCurrentTarget) {
GetEventTarget();
}
// Make sure to dispatch the click even if there is no frame for
// the current target element. This is required for Web compatibility.
ret = CheckForAndDispatchClick(presContext, (nsMouseEvent*)aEvent,
aStatus);
}
nsIPresShell *shell = presContext->GetPresShell();
if (shell) {
nsRefPtr<nsFrameSelection> frameSelection = shell->FrameSelection();
frameSelection->SetMouseDownState(false);
}
}
break;
case NS_MOUSE_SCROLL:
case NS_MOUSE_PIXEL_SCROLL:
{
nsMouseScrollEvent *msEvent = static_cast<nsMouseScrollEvent*>(aEvent);
if (aEvent->message == NS_MOUSE_SCROLL) {
// Mark the subsequent pixel scrolls as valid / invalid, based on the
// observation if the previous line scroll has been canceled
if (msEvent->scrollFlags & nsMouseScrollEvent::kIsHorizontal) {
mLastLineScrollConsumedX = (nsEventStatus_eConsumeNoDefault == *aStatus);
} else if (msEvent->scrollFlags & nsMouseScrollEvent::kIsVertical) {
mLastLineScrollConsumedY = (nsEventStatus_eConsumeNoDefault == *aStatus);
}
if (!(msEvent->scrollFlags & nsMouseScrollEvent::kHasPixels)) {
// No generated pixel scroll event will follow.
// Create and send a pixel scroll DOM event now.
nsWeakFrame weakFrame(aTargetFrame);
SendPixelScrollEvent(aTargetFrame, msEvent, presContext, aStatus);
NS_ENSURE_STATE(weakFrame.IsAlive());
}
}
if (*aStatus != nsEventStatus_eConsumeNoDefault) {
bool useSysNumLines = UseSystemScrollSettingFor(msEvent);
PRInt32 action = ComputeWheelActionFor(msEvent, useSysNumLines);
switch (action) {
case MOUSE_SCROLL_N_LINES:
DoScrollText(aTargetFrame, msEvent, nsIScrollableFrame::LINES,
useSysNumLines, nullptr, nsGkAtoms::mouseWheel);
break;
case MOUSE_SCROLL_PAGE:
DoScrollText(aTargetFrame, msEvent, nsIScrollableFrame::PAGES,
false);
break;
case MOUSE_SCROLL_PIXELS:
{
bool fromLines = msEvent->scrollFlags & nsMouseScrollEvent::kFromLines;
DoScrollText(aTargetFrame, msEvent, nsIScrollableFrame::DEVICE_PIXELS,
false, nullptr, (fromLines ? nsGkAtoms::mouseWheel : nullptr));
}
break;
case MOUSE_SCROLL_HISTORY:
DoScrollHistory(msEvent->delta);
break;
case MOUSE_SCROLL_ZOOM:
DoScrollZoom(aTargetFrame, msEvent->delta);
break;
default: // Including -1 (do nothing)
break;
}
*aStatus = nsEventStatus_eConsumeNoDefault;
}
}
break;
case NS_GESTURENOTIFY_EVENT_START:
{
if (nsEventStatus_eConsumeNoDefault != *aStatus)
DecideGestureEvent(static_cast<nsGestureNotifyEvent*>(aEvent), mCurrentTarget);
}
break;
case NS_DRAGDROP_ENTER:
case NS_DRAGDROP_OVER:
{
NS_ASSERTION(aEvent->eventStructType == NS_DRAG_EVENT, "Expected a drag event");
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (!dragSession)
break;
// Reset the flag.
dragSession->SetOnlyChromeDrop(false);
if (mPresContext) {
EnsureDocument(mPresContext);
}
bool isChromeDoc = nsContentUtils::IsChromeDoc(mDocument);
// the initial dataTransfer is the one from the dragstart event that
// was set on the dragSession when the drag began.
nsCOMPtr<nsIDOMDataTransfer> dataTransfer;
nsCOMPtr<nsIDOMDataTransfer> initialDataTransfer;
dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer));
nsDragEvent *dragEvent = (nsDragEvent*)aEvent;
// collect any changes to moz cursor settings stored in the event's
// data transfer.
UpdateDragDataTransfer(dragEvent);
// cancelling a dragenter or dragover event means that a drop should be
// allowed, so update the dropEffect and the canDrop state to indicate
// that a drag is allowed. If the event isn't cancelled, a drop won't be
// allowed. Essentially, to allow a drop somewhere, specify the effects
// using the effectAllowed and dropEffect properties in a dragenter or
// dragover event and cancel the event. To not allow a drop somewhere,
// don't cancel the event or set the effectAllowed or dropEffect to
// "none". This way, if the event is just ignored, no drop will be
// allowed.
PRUint32 dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
if (nsEventStatus_eConsumeNoDefault == *aStatus) {
// if the event has a dataTransfer set, use it.
if (dragEvent->dataTransfer) {
// get the dataTransfer and the dropEffect that was set on it
dataTransfer = do_QueryInterface(dragEvent->dataTransfer);
dataTransfer->GetDropEffectInt(&dropEffect);
}
else {
// if dragEvent->dataTransfer is null, it means that no attempt was
// made to access the dataTransfer during the event, yet the event
// was cancelled. Instead, use the initial data transfer available
// from the drag session. The drop effect would not have been
// initialized (which is done in nsDOMDragEvent::GetDataTransfer),
// so set it from the drag action. We'll still want to filter it
// based on the effectAllowed below.
dataTransfer = initialDataTransfer;
PRUint32 action;
dragSession->GetDragAction(&action);
// filter the drop effect based on the action. Use UNINITIALIZED as
// any effect is allowed.
dropEffect = nsContentUtils::FilterDropEffect(action,
nsIDragService::DRAGDROP_ACTION_UNINITIALIZED);
}
// At this point, if the dataTransfer is null, it means that the
// drag was originally started by directly calling the drag service.
// Just assume that all effects are allowed.
PRUint32 effectAllowed = nsIDragService::DRAGDROP_ACTION_UNINITIALIZED;
if (dataTransfer)
dataTransfer->GetEffectAllowedInt(&effectAllowed);
// set the drag action based on the drop effect and effect allowed.
// The drop effect field on the drag transfer object specifies the
// desired current drop effect. However, it cannot be used if the
// effectAllowed state doesn't include that type of action. If the
// dropEffect is "none", then the action will be 'none' so a drop will
// not be allowed.
PRUint32 action = nsIDragService::DRAGDROP_ACTION_NONE;
if (effectAllowed == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED ||
dropEffect & effectAllowed)
action = dropEffect;
if (action == nsIDragService::DRAGDROP_ACTION_NONE)
dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
// inform the drag session that a drop is allowed on this node.
dragSession->SetDragAction(action);
dragSession->SetCanDrop(action != nsIDragService::DRAGDROP_ACTION_NONE);
// For now, do this only for dragover.
//XXXsmaug dragenter needs some more work.
if (aEvent->message == NS_DRAGDROP_OVER && !isChromeDoc) {
// Someone has called preventDefault(), check whether is was content.
dragSession->SetOnlyChromeDrop(
!(aEvent->flags & NS_EVENT_FLAG_NO_DEFAULT_CALLED_IN_CONTENT));
}
} else if (aEvent->message == NS_DRAGDROP_OVER && !isChromeDoc) {
// No one called preventDefault(), so handle drop only in chrome.
dragSession->SetOnlyChromeDrop(true);
}
// now set the drop effect in the initial dataTransfer. This ensures
// that we can get the desired drop effect in the drop event.
if (initialDataTransfer)
initialDataTransfer->SetDropEffectInt(dropEffect);
}
break;
case NS_DRAGDROP_DROP:
{
// now fire the dragdrop event, for compatibility with XUL
if (mCurrentTarget && nsEventStatus_eConsumeNoDefault != *aStatus) {
nsCOMPtr<nsIContent> targetContent;
mCurrentTarget->GetContentForEvent(aEvent,
getter_AddRefs(targetContent));
nsCOMPtr<nsIWidget> widget = mCurrentTarget->GetNearestWidget();
nsDragEvent event(NS_IS_TRUSTED_EVENT(aEvent), NS_DRAGDROP_DRAGDROP, widget);
nsMouseEvent* mouseEvent = static_cast<nsMouseEvent*>(aEvent);
event.refPoint = mouseEvent->refPoint;
if (mouseEvent->widget) {
event.refPoint += mouseEvent->widget->WidgetToScreenOffset();
}
event.refPoint -= widget->WidgetToScreenOffset();
event.modifiers = mouseEvent->modifiers;
event.buttons = mouseEvent->buttons;
event.inputSource = mouseEvent->inputSource;
nsEventStatus status = nsEventStatus_eIgnore;
nsCOMPtr<nsIPresShell> presShell = mPresContext->GetPresShell();
if (presShell) {
presShell->HandleEventWithTarget(&event, mCurrentTarget,
targetContent, &status);
}
}
sLastDragOverFrame = nullptr;
ClearGlobalActiveContent(this);
break;
}
case NS_DRAGDROP_EXIT:
// make sure to fire the enter and exit_synth events after the
// NS_DRAGDROP_EXIT event, otherwise we'll clean up too early
GenerateDragDropEnterExit(presContext, (nsGUIEvent*)aEvent);
break;
case NS_KEY_UP:
break;
case NS_KEY_PRESS:
if (nsEventStatus_eConsumeNoDefault != *aStatus) {
nsKeyEvent* keyEvent = (nsKeyEvent*)aEvent;
//This is to prevent keyboard scrolling while alt modifier in use.
if (!keyEvent->IsAlt()) {
switch(keyEvent->keyCode) {
case NS_VK_TAB:
case NS_VK_F6:
EnsureDocument(mPresContext);
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && mDocument) {
// Shift focus forward or back depending on shift key
bool isDocMove = ((nsInputEvent*)aEvent)->IsControl() ||
(keyEvent->keyCode == NS_VK_F6);
PRUint32 dir =
static_cast<nsInputEvent*>(aEvent)->IsShift() ?
(isDocMove ? static_cast<PRUint32>(nsIFocusManager::MOVEFOCUS_BACKWARDDOC) :
static_cast<PRUint32>(nsIFocusManager::MOVEFOCUS_BACKWARD)) :
(isDocMove ? static_cast<PRUint32>(nsIFocusManager::MOVEFOCUS_FORWARDDOC) :
static_cast<PRUint32>(nsIFocusManager::MOVEFOCUS_FORWARD));
nsCOMPtr<nsIDOMElement> result;
fm->MoveFocus(mDocument->GetWindow(), nullptr, dir,
nsIFocusManager::FLAG_BYKEY,
getter_AddRefs(result));
}
*aStatus = nsEventStatus_eConsumeNoDefault;
break;
}
}
}
break;
case NS_MOUSE_ENTER:
if (mCurrentTarget) {
nsCOMPtr<nsIContent> targetContent;
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
SetContentState(targetContent, NS_EVENT_STATE_HOVER);
}
break;
#ifdef XP_MACOSX
case NS_MOUSE_ACTIVATE:
if (mCurrentTarget) {
nsCOMPtr<nsIContent> targetContent;
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
if (!NodeAllowsClickThrough(targetContent)) {
*aStatus = nsEventStatus_eConsumeNoDefault;
}
}
break;
#endif
}
//Reset target frame to null to avoid mistargeting after reentrant event
mCurrentTarget = nullptr;
mCurrentTargetContent = nullptr;
return ret;
}
bool
nsEventStateManager::RemoteQueryContentEvent(nsEvent *aEvent)
{
nsQueryContentEvent *queryEvent =
static_cast<nsQueryContentEvent*>(aEvent);
if (!IsTargetCrossProcess(queryEvent)) {
return false;
}
// Will not be handled locally, remote the event
GetCrossProcessTarget()->HandleQueryContentEvent(*queryEvent);
return true;
}
TabParent*
nsEventStateManager::GetCrossProcessTarget()
{
return TabParent::GetIMETabParent();
}
bool
nsEventStateManager::IsTargetCrossProcess(nsGUIEvent *aEvent)
{
// Check to see if there is a focused, editable content in chrome,
// in that case, do not forward IME events to content
nsIContent *focusedContent = GetFocusedContent();
if (focusedContent && focusedContent->IsEditable())
return false;
return TabParent::GetIMETabParent() != nullptr;
}
void
nsEventStateManager::NotifyDestroyPresContext(nsPresContext* aPresContext)
{
nsIMEStateManager::OnDestroyPresContext(aPresContext);
if (mHoverContent) {
// Bug 70855: Presentation is going away, possibly for a reframe.
// Reset the hover state so that if we're recreating the presentation,
// we won't have the old hover state still set in the new presentation,
// as if the new presentation is resized, a new element may be hovered.
SetContentState(nullptr, NS_EVENT_STATE_HOVER);
}
}
void
nsEventStateManager::SetPresContext(nsPresContext* aPresContext)
{
mPresContext = aPresContext;
}
void
nsEventStateManager::ClearFrameRefs(nsIFrame* aFrame)
{
if (aFrame && aFrame == mCurrentTarget) {
mCurrentTargetContent = aFrame->GetContent();
}
}
void
nsEventStateManager::UpdateCursor(nsPresContext* aPresContext,
nsEvent* aEvent, nsIFrame* aTargetFrame,
nsEventStatus* aStatus)
{
if (aTargetFrame && IsRemoteTarget(aTargetFrame->GetContent())) {
return;
}
PRInt32 cursor = NS_STYLE_CURSOR_DEFAULT;
imgIContainer* container = nullptr;
bool haveHotspot = false;
float hotspotX = 0.0f, hotspotY = 0.0f;
//If cursor is locked just use the locked one
if (mLockCursor) {
cursor = mLockCursor;
}
//If not locked, look for correct cursor
else if (aTargetFrame) {
nsIFrame::Cursor framecursor;
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
aTargetFrame);
if (NS_FAILED(aTargetFrame->GetCursor(pt, framecursor)))
return; // don't update the cursor if we failed to get it from the frame see bug 118877
cursor = framecursor.mCursor;
container = framecursor.mContainer;
haveHotspot = framecursor.mHaveHotspot;
hotspotX = framecursor.mHotspotX;
hotspotY = framecursor.mHotspotY;
}
if (Preferences::GetBool("ui.use_activity_cursor", false)) {
// Check whether or not to show the busy cursor
nsCOMPtr<nsISupports> pcContainer = aPresContext->GetContainer();
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(pcContainer));
if (!docShell) return;
PRUint32 busyFlags = nsIDocShell::BUSY_FLAGS_NONE;
docShell->GetBusyFlags(&busyFlags);
// Show busy cursor everywhere before page loads
// and just replace the arrow cursor after page starts loading
if (busyFlags & nsIDocShell::BUSY_FLAGS_BUSY &&
(cursor == NS_STYLE_CURSOR_AUTO || cursor == NS_STYLE_CURSOR_DEFAULT))
{
cursor = NS_STYLE_CURSOR_SPINNING;
container = nullptr;
}
}
if (aTargetFrame) {
SetCursor(cursor, container, haveHotspot, hotspotX, hotspotY,
aTargetFrame->GetNearestWidget(), false);
}
if (mLockCursor || NS_STYLE_CURSOR_AUTO != cursor) {
*aStatus = nsEventStatus_eConsumeDoDefault;
}
}
nsresult
nsEventStateManager::SetCursor(PRInt32 aCursor, imgIContainer* aContainer,
bool aHaveHotspot,
float aHotspotX, float aHotspotY,
nsIWidget* aWidget, bool aLockCursor)
{
EnsureDocument(mPresContext);
NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
sMouseOverDocument = mDocument.get();
nsCursor c;
NS_ENSURE_TRUE(aWidget, NS_ERROR_FAILURE);
if (aLockCursor) {
if (NS_STYLE_CURSOR_AUTO != aCursor) {
mLockCursor = aCursor;
}
else {
//If cursor style is set to auto we unlock the cursor again.
mLockCursor = 0;
}
}
switch (aCursor) {
default:
case NS_STYLE_CURSOR_AUTO:
case NS_STYLE_CURSOR_DEFAULT:
c = eCursor_standard;
break;
case NS_STYLE_CURSOR_POINTER:
c = eCursor_hyperlink;
break;
case NS_STYLE_CURSOR_CROSSHAIR:
c = eCursor_crosshair;
break;
case NS_STYLE_CURSOR_MOVE:
c = eCursor_move;
break;
case NS_STYLE_CURSOR_TEXT:
c = eCursor_select;
break;
case NS_STYLE_CURSOR_WAIT:
c = eCursor_wait;
break;
case NS_STYLE_CURSOR_HELP:
c = eCursor_help;
break;
case NS_STYLE_CURSOR_N_RESIZE:
c = eCursor_n_resize;
break;
case NS_STYLE_CURSOR_S_RESIZE:
c = eCursor_s_resize;
break;
case NS_STYLE_CURSOR_W_RESIZE:
c = eCursor_w_resize;
break;
case NS_STYLE_CURSOR_E_RESIZE:
c = eCursor_e_resize;
break;
case NS_STYLE_CURSOR_NW_RESIZE:
c = eCursor_nw_resize;
break;
case NS_STYLE_CURSOR_SE_RESIZE:
c = eCursor_se_resize;
break;
case NS_STYLE_CURSOR_NE_RESIZE:
c = eCursor_ne_resize;
break;
case NS_STYLE_CURSOR_SW_RESIZE:
c = eCursor_sw_resize;
break;
case NS_STYLE_CURSOR_COPY: // CSS3
c = eCursor_copy;
break;
case NS_STYLE_CURSOR_ALIAS:
c = eCursor_alias;
break;
case NS_STYLE_CURSOR_CONTEXT_MENU:
c = eCursor_context_menu;
break;
case NS_STYLE_CURSOR_CELL:
c = eCursor_cell;
break;
case NS_STYLE_CURSOR_GRAB:
c = eCursor_grab;
break;
case NS_STYLE_CURSOR_GRABBING:
c = eCursor_grabbing;
break;
case NS_STYLE_CURSOR_SPINNING:
c = eCursor_spinning;
break;
case NS_STYLE_CURSOR_MOZ_ZOOM_IN:
c = eCursor_zoom_in;
break;
case NS_STYLE_CURSOR_MOZ_ZOOM_OUT:
c = eCursor_zoom_out;
break;
case NS_STYLE_CURSOR_NOT_ALLOWED:
c = eCursor_not_allowed;
break;
case NS_STYLE_CURSOR_COL_RESIZE:
c = eCursor_col_resize;
break;
case NS_STYLE_CURSOR_ROW_RESIZE:
c = eCursor_row_resize;
break;
case NS_STYLE_CURSOR_NO_DROP:
c = eCursor_no_drop;
break;
case NS_STYLE_CURSOR_VERTICAL_TEXT:
c = eCursor_vertical_text;
break;
case NS_STYLE_CURSOR_ALL_SCROLL:
c = eCursor_all_scroll;
break;
case NS_STYLE_CURSOR_NESW_RESIZE:
c = eCursor_nesw_resize;
break;
case NS_STYLE_CURSOR_NWSE_RESIZE:
c = eCursor_nwse_resize;
break;
case NS_STYLE_CURSOR_NS_RESIZE:
c = eCursor_ns_resize;
break;
case NS_STYLE_CURSOR_EW_RESIZE:
c = eCursor_ew_resize;
break;
case NS_STYLE_CURSOR_NONE:
c = eCursor_none;
break;
}
// First, try the imgIContainer, if non-null
nsresult rv = NS_ERROR_FAILURE;
if (aContainer) {
PRUint32 hotspotX, hotspotY;
// css3-ui says to use the CSS-specified hotspot if present,
// otherwise use the intrinsic hotspot, otherwise use the top left
// corner.
if (aHaveHotspot) {
PRInt32 imgWidth, imgHeight;
aContainer->GetWidth(&imgWidth);
aContainer->GetHeight(&imgHeight);
// XXX NS_MAX(NS_lround(x), 0)?
hotspotX = aHotspotX > 0.0f
? PRUint32(aHotspotX + 0.5f) : PRUint32(0);
if (hotspotX >= PRUint32(imgWidth))
hotspotX = imgWidth - 1;
hotspotY = aHotspotY > 0.0f
? PRUint32(aHotspotY + 0.5f) : PRUint32(0);
if (hotspotY >= PRUint32(imgHeight))
hotspotY = imgHeight - 1;
} else {
hotspotX = 0;
hotspotY = 0;
nsCOMPtr<nsIProperties> props(do_QueryInterface(aContainer));
if (props) {
nsCOMPtr<nsISupportsPRUint32> hotspotXWrap, hotspotYWrap;
props->Get("hotspotX", NS_GET_IID(nsISupportsPRUint32), getter_AddRefs(hotspotXWrap));
props->Get("hotspotY", NS_GET_IID(nsISupportsPRUint32), getter_AddRefs(hotspotYWrap));
if (hotspotXWrap)
hotspotXWrap->GetData(&hotspotX);
if (hotspotYWrap)
hotspotYWrap->GetData(&hotspotY);
}
}
rv = aWidget->SetCursor(aContainer, hotspotX, hotspotY);
}
if (NS_FAILED(rv))
aWidget->SetCursor(c);
return NS_OK;
}
class NS_STACK_CLASS nsESMEventCB : public nsDispatchingCallback
{
public:
nsESMEventCB(nsIContent* aTarget) : mTarget(aTarget) {}
virtual void HandleEvent(nsEventChainPostVisitor& aVisitor)
{
if (aVisitor.mPresContext) {
nsIFrame* frame = aVisitor.mPresContext->GetPrimaryFrameFor(mTarget);
if (frame) {
frame->HandleEvent(aVisitor.mPresContext,
(nsGUIEvent*) aVisitor.mEvent,
&aVisitor.mEventStatus);
}
}
}
nsCOMPtr<nsIContent> mTarget;
};
nsIFrame*
nsEventStateManager::DispatchMouseEvent(nsGUIEvent* aEvent, PRUint32 aMessage,
nsIContent* aTargetContent,
nsIContent* aRelatedContent)
{
// http://dvcs.w3.org/hg/webevents/raw-file/default/mouse-lock.html#methods
// "[When the mouse is locked on an element...e]vents that require the concept
// of a mouse cursor must not be dispatched (for example: mouseover, mouseout).
if (sIsPointerLocked &&
(aMessage == NS_MOUSELEAVE ||
aMessage == NS_MOUSEENTER ||
aMessage == NS_MOUSE_ENTER_SYNTH ||
aMessage == NS_MOUSE_EXIT_SYNTH)) {
mCurrentTargetContent = nullptr;
nsCOMPtr<Element> pointerLockedElement =
do_QueryReferent(nsEventStateManager::sPointerLockedElement);
if (!pointerLockedElement) {
NS_WARNING("Should have pointer locked element, but didn't.");
return nullptr;
}
nsCOMPtr<nsIContent> content = do_QueryInterface(pointerLockedElement);
return mPresContext->GetPrimaryFrameFor(content);
}
SAMPLE_LABEL("Input", "DispatchMouseEvent");
nsEventStatus status = nsEventStatus_eIgnore;
nsMouseEvent event(NS_IS_TRUSTED_EVENT(aEvent), aMessage, aEvent->widget,
nsMouseEvent::eReal);
event.refPoint = aEvent->refPoint;
event.modifiers = ((nsMouseEvent*)aEvent)->modifiers;
event.buttons = ((nsMouseEvent*)aEvent)->buttons;
event.pluginEvent = ((nsMouseEvent*)aEvent)->pluginEvent;
event.relatedTarget = aRelatedContent;
event.inputSource = static_cast<nsMouseEvent*>(aEvent)->inputSource;
nsWeakFrame previousTarget = mCurrentTarget;
mCurrentTargetContent = aTargetContent;
nsIFrame* targetFrame = nullptr;
if (aTargetContent) {
nsESMEventCB callback(aTargetContent);
nsEventDispatcher::Dispatch(aTargetContent, mPresContext, &event, nullptr,
&status, &callback);
// Although the primary frame was checked in event callback,
// it may not be the same object after event dispatching and handling.
// So we need to refetch it.
if (mPresContext) {
targetFrame = mPresContext->GetPrimaryFrameFor(aTargetContent);
}
}
mCurrentTargetContent = nullptr;
mCurrentTarget = previousTarget;
return targetFrame;
}
class MouseEnterLeaveDispatcher
{
public:
MouseEnterLeaveDispatcher(nsEventStateManager* aESM,
nsIContent* aTarget, nsIContent* aRelatedTarget,
nsGUIEvent* aEvent, PRUint32 aType)
: mESM(aESM), mEvent(aEvent), mType(aType)
{
nsPIDOMWindow* win =
aTarget ? aTarget->OwnerDoc()->GetInnerWindow() : nullptr;
if (win && win->HasMouseEnterLeaveEventListeners()) {
mRelatedTarget = aRelatedTarget ?
aRelatedTarget->FindFirstNonNativeAnonymous() : nullptr;
nsINode* commonParent = nullptr;
if (aTarget && aRelatedTarget) {
commonParent =
nsContentUtils::GetCommonAncestor(aTarget, aRelatedTarget);
}
nsIContent* current = aTarget;
// Note, it is ok if commonParent is null!
while (current && current != commonParent) {
if (!current->IsInNativeAnonymousSubtree()) {
mTargets.AppendObject(current);
}
// mouseenter/leave is fired only on elements.
current = current->GetParent();
}
}
}
~MouseEnterLeaveDispatcher()
{
if (mType == NS_MOUSEENTER) {
for (PRInt32 i = mTargets.Count() - 1; i >= 0; --i) {
mESM->DispatchMouseEvent(mEvent, mType, mTargets[i], mRelatedTarget);
}
} else {
for (PRInt32 i = 0; i < mTargets.Count(); ++i) {
mESM->DispatchMouseEvent(mEvent, mType, mTargets[i], mRelatedTarget);
}
}
}
nsEventStateManager* mESM;
nsCOMArray<nsIContent> mTargets;
nsCOMPtr<nsIContent> mRelatedTarget;
nsGUIEvent* mEvent;
PRUint32 mType;
};
void
nsEventStateManager::NotifyMouseOut(nsGUIEvent* aEvent, nsIContent* aMovingInto)
{
if (!mLastMouseOverElement)
return;
// Before firing mouseout, check for recursion
if (mLastMouseOverElement == mFirstMouseOutEventElement)
return;
if (mLastMouseOverFrame) {
// if the frame is associated with a subdocument,
// tell the subdocument that we're moving out of it
nsSubDocumentFrame* subdocFrame = do_QueryFrame(mLastMouseOverFrame.GetFrame());
if (subdocFrame) {
nsCOMPtr<nsIDocShell> docshell;
subdocFrame->GetDocShell(getter_AddRefs(docshell));
if (docshell) {
nsRefPtr<nsPresContext> presContext;
docshell->GetPresContext(getter_AddRefs(presContext));
if (presContext) {
nsEventStateManager* kidESM = presContext->EventStateManager();
// Not moving into any element in this subdocument
kidESM->NotifyMouseOut(aEvent, nullptr);
}
}
}
}
// That could have caused DOM events which could wreak havoc. Reverify
// things and be careful.
if (!mLastMouseOverElement)
return;
// Store the first mouseOut event we fire and don't refire mouseOut
// to that element while the first mouseOut is still ongoing.
mFirstMouseOutEventElement = mLastMouseOverElement;
// Don't touch hover state if aMovingInto is non-null. Caller will update
// hover state itself, and we have optimizations for hover switching between
// two nearby elements both deep in the DOM tree that would be defeated by
// switching the hover state to null here.
if (!aMovingInto) {
// Unset :hover
SetContentState(nullptr, NS_EVENT_STATE_HOVER);
}
MouseEnterLeaveDispatcher leaveDispatcher(this, mLastMouseOverElement, aMovingInto,
aEvent, NS_MOUSELEAVE);
// Fire mouseout
DispatchMouseEvent(aEvent, NS_MOUSE_EXIT_SYNTH,
mLastMouseOverElement, aMovingInto);
mLastMouseOverFrame = nullptr;
mLastMouseOverElement = nullptr;
// Turn recursion protection back off
mFirstMouseOutEventElement = nullptr;
}
void
nsEventStateManager::NotifyMouseOver(nsGUIEvent* aEvent, nsIContent* aContent)
{
NS_ASSERTION(aContent, "Mouse must be over something");
if (mLastMouseOverElement == aContent)
return;
// Before firing mouseover, check for recursion
if (aContent == mFirstMouseOverEventElement)
return;
// Check to see if we're a subdocument and if so update the parent
// document's ESM state to indicate that the mouse is over the
// content associated with our subdocument.
EnsureDocument(mPresContext);
nsIDocument *parentDoc = mDocument->GetParentDocument();
if (parentDoc) {
nsIContent *docContent = parentDoc->FindContentForSubDocument(mDocument);
if (docContent) {
nsIPresShell *parentShell = parentDoc->GetShell();
if (parentShell) {
nsEventStateManager* parentESM = parentShell->GetPresContext()->EventStateManager();
parentESM->NotifyMouseOver(aEvent, docContent);
}
}
}
// Firing the DOM event in the parent document could cause all kinds
// of havoc. Reverify and take care.
if (mLastMouseOverElement == aContent)
return;
// Remember mLastMouseOverElement as the related content for the
// DispatchMouseEvent() call below, since NotifyMouseOut() resets it, bug 298477.
nsCOMPtr<nsIContent> lastMouseOverElement = mLastMouseOverElement;
MouseEnterLeaveDispatcher enterDispatcher(this, aContent, lastMouseOverElement,
aEvent, NS_MOUSEENTER);
NotifyMouseOut(aEvent, aContent);
// Store the first mouseOver event we fire and don't refire mouseOver
// to that element while the first mouseOver is still ongoing.
mFirstMouseOverEventElement = aContent;
SetContentState(aContent, NS_EVENT_STATE_HOVER);
// Fire mouseover
mLastMouseOverFrame = DispatchMouseEvent(aEvent, NS_MOUSE_ENTER_SYNTH,
aContent, lastMouseOverElement);
mLastMouseOverElement = aContent;
// Turn recursion protection back off
mFirstMouseOverEventElement = nullptr;
}
// Returns the center point of the window's inner content area.
// This is in widget coordinates, i.e. relative to the widget's top
// left corner, not in screen coordinates.
static nsIntPoint
GetWindowInnerRectCenter(nsPIDOMWindow* aWindow,
nsIWidget* aWidget,
nsPresContext* aContext)
{
NS_ENSURE_TRUE(aWindow && aWidget && aContext, nsIntPoint(0,0));
float cssInnerX = 0.0;
aWindow->GetMozInnerScreenX(&cssInnerX);
PRInt32 innerX = PRInt32(NS_round(aContext->CSSPixelsToDevPixels(cssInnerX)));
float cssInnerY = 0.0;
aWindow->GetMozInnerScreenY(&cssInnerY);
PRInt32 innerY = PRInt32(NS_round(aContext->CSSPixelsToDevPixels(cssInnerY)));
PRInt32 innerWidth = 0;
aWindow->GetInnerWidth(&innerWidth);
PRInt32 innerHeight = 0;
aWindow->GetInnerHeight(&innerHeight);
nsIntRect screen;
aWidget->GetScreenBounds(screen);
return nsIntPoint(innerX - screen.x + innerWidth / 2,
innerY - screen.y + innerHeight / 2);
}
void
nsEventStateManager::GenerateMouseEnterExit(nsGUIEvent* aEvent)
{
EnsureDocument(mPresContext);
if (!mDocument)
return;
// Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
switch(aEvent->message) {
case NS_MOUSE_MOVE:
{
if (sIsPointerLocked && aEvent->widget) {
// Perform mouse lock by recentering the mouse directly, and storing
// the refpoints so movement deltas can be calculated.
nsIntPoint center = GetWindowInnerRectCenter(mDocument->GetWindow(),
aEvent->widget,
mPresContext);
aEvent->lastRefPoint = center;
if (aEvent->refPoint != center) {
// This mouse move doesn't finish at the center of the widget,
// dispatch a synthetic mouse move to return the mouse back to
// the center.
aEvent->widget->SynthesizeNativeMouseMove(center);
}
} else {
aEvent->lastRefPoint = sLastRefPoint;
}
// Update the last known refPoint with the current refPoint.
sLastRefPoint = aEvent->refPoint;
// Get the target content target (mousemove target == mouseover target)
nsCOMPtr<nsIContent> targetElement = GetEventTargetContent(aEvent);
if (!targetElement) {
// We're always over the document root, even if we're only
// over dead space in a page (whose frame is not associated with
// any content) or in print preview dead space
targetElement = mDocument->GetRootElement();
}
if (targetElement) {
NotifyMouseOver(aEvent, targetElement);
}
}
break;
case NS_MOUSE_EXIT:
{
// This is actually the window mouse exit event. We're not moving
// into any new element.
if (mLastMouseOverFrame &&
nsContentUtils::GetTopLevelWidget(aEvent->widget) !=
nsContentUtils::GetTopLevelWidget(mLastMouseOverFrame->GetNearestWidget())) {
// the MouseOut event widget doesn't have same top widget with
// mLastMouseOverFrame, it's a spurious event for mLastMouseOverFrame
break;
}
NotifyMouseOut(aEvent, nullptr);
}
break;
}
// reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
}
void
nsEventStateManager::SetPointerLock(nsIWidget* aWidget,
nsIContent* aElement)
{
// NOTE: aElement will be nullptr when unlocking.
sIsPointerLocked = !!aElement;
if (!aWidget) {
return;
}
// Reset mouse wheel transaction
nsMouseWheelTransaction::EndTransaction();
// Deal with DnD events
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
if (sIsPointerLocked) {
// Store the last known ref point so we can reposition the pointer after unlock.
mPreLockPoint = sLastRefPoint;
// Fire a synthetic mouse move to ensure event state is updated. We first
// set the mouse to the center of the window, so that the mouse event
// doesn't report any movement.
sLastRefPoint = GetWindowInnerRectCenter(aElement->OwnerDoc()->GetWindow(),
aWidget,
mPresContext);
aWidget->SynthesizeNativeMouseMove(sLastRefPoint);
// Retarget all events to this element via capture.
nsIPresShell::SetCapturingContent(aElement, CAPTURE_POINTERLOCK);
// Suppress DnD
if (dragService) {
dragService->Suppress();
}
} else {
// Unlocking, so return pointer to the original position by firing a
// synthetic mouse event. We first reset sLastRefPoint to its
// pre-pointerlock position, so that the synthetic mouse event reports
// no movement.
sLastRefPoint = mPreLockPoint;
aWidget->SynthesizeNativeMouseMove(mPreLockPoint);
// Don't retarget events to this element any more.
nsIPresShell::SetCapturingContent(nullptr, CAPTURE_POINTERLOCK);
// Unsuppress DnD
if (dragService) {
dragService->Unsuppress();
}
}
}
void
nsEventStateManager::GenerateDragDropEnterExit(nsPresContext* aPresContext,
nsGUIEvent* aEvent)
{
//Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
switch(aEvent->message) {
case NS_DRAGDROP_OVER:
{
// when dragging from one frame to another, events are fired in the
// order: dragexit, dragenter, dragleave
if (sLastDragOverFrame != mCurrentTarget) {
//We'll need the content, too, to check if it changed separately from the frames.
nsCOMPtr<nsIContent> lastContent;
nsCOMPtr<nsIContent> targetContent;
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
if (sLastDragOverFrame) {
//The frame has changed but the content may not have. Check before dispatching to content
sLastDragOverFrame->GetContentForEvent(aEvent, getter_AddRefs(lastContent));
FireDragEnterOrExit(sLastDragOverFrame->PresContext(),
aEvent, NS_DRAGDROP_EXIT_SYNTH,
targetContent, lastContent, sLastDragOverFrame);
}
FireDragEnterOrExit(aPresContext, aEvent, NS_DRAGDROP_ENTER,
lastContent, targetContent, mCurrentTarget);
if (sLastDragOverFrame) {
FireDragEnterOrExit(sLastDragOverFrame->PresContext(),
aEvent, NS_DRAGDROP_LEAVE_SYNTH,
targetContent, lastContent, sLastDragOverFrame);
}
sLastDragOverFrame = mCurrentTarget;
}
}
break;
case NS_DRAGDROP_EXIT:
{
//This is actually the window mouse exit event.
if (sLastDragOverFrame) {
nsCOMPtr<nsIContent> lastContent;
sLastDragOverFrame->GetContentForEvent(aEvent, getter_AddRefs(lastContent));
nsRefPtr<nsPresContext> lastDragOverFramePresContext = sLastDragOverFrame->PresContext();
FireDragEnterOrExit(lastDragOverFramePresContext,
aEvent, NS_DRAGDROP_EXIT_SYNTH,
nullptr, lastContent, sLastDragOverFrame);
FireDragEnterOrExit(lastDragOverFramePresContext,
aEvent, NS_DRAGDROP_LEAVE_SYNTH,
nullptr, lastContent, sLastDragOverFrame);
sLastDragOverFrame = nullptr;
}
}
break;
}
//reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
// Now flush all pending notifications, for better responsiveness.
FlushPendingEvents(aPresContext);
}
void
nsEventStateManager::FireDragEnterOrExit(nsPresContext* aPresContext,
nsGUIEvent* aEvent,
PRUint32 aMsg,
nsIContent* aRelatedTarget,
nsIContent* aTargetContent,
nsWeakFrame& aTargetFrame)
{
nsEventStatus status = nsEventStatus_eIgnore;
nsDragEvent event(NS_IS_TRUSTED_EVENT(aEvent), aMsg, aEvent->widget);
event.refPoint = aEvent->refPoint;
event.modifiers = ((nsMouseEvent*)aEvent)->modifiers;
event.buttons = ((nsMouseEvent*)aEvent)->buttons;
event.relatedTarget = aRelatedTarget;
event.inputSource = static_cast<nsMouseEvent*>(aEvent)->inputSource;
mCurrentTargetContent = aTargetContent;
if (aTargetContent != aRelatedTarget) {
//XXX This event should still go somewhere!!
if (aTargetContent)
nsEventDispatcher::Dispatch(aTargetContent, aPresContext, &event,
nullptr, &status);
// adjust the drag hover if the dragenter event was cancelled or this is a drag exit
if (status == nsEventStatus_eConsumeNoDefault || aMsg == NS_DRAGDROP_EXIT)
SetContentState((aMsg == NS_DRAGDROP_ENTER) ? aTargetContent : nullptr,
NS_EVENT_STATE_DRAGOVER);
// collect any changes to moz cursor settings stored in the event's
// data transfer.
if (aMsg == NS_DRAGDROP_LEAVE_SYNTH || aMsg == NS_DRAGDROP_EXIT_SYNTH ||
aMsg == NS_DRAGDROP_ENTER)
UpdateDragDataTransfer(&event);
}
// Finally dispatch the event to the frame
if (aTargetFrame)
aTargetFrame->HandleEvent(aPresContext, &event, &status);
}
void
nsEventStateManager::UpdateDragDataTransfer(nsDragEvent* dragEvent)
{
NS_ASSERTION(dragEvent, "drag event is null in UpdateDragDataTransfer!");
if (!dragEvent->dataTransfer)
return;
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (dragSession) {
// the initial dataTransfer is the one from the dragstart event that
// was set on the dragSession when the drag began.
nsCOMPtr<nsIDOMDataTransfer> initialDataTransfer;
dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer));
if (initialDataTransfer) {
// retrieve the current moz cursor setting and save it.
nsAutoString mozCursor;
dragEvent->dataTransfer->GetMozCursor(mozCursor);
initialDataTransfer->SetMozCursor(mozCursor);
}
}
}
nsresult
nsEventStateManager::SetClickCount(nsPresContext* aPresContext,
nsMouseEvent *aEvent,
nsEventStatus* aStatus)
{
nsCOMPtr<nsIContent> mouseContent;
nsIContent* mouseContentParent = nullptr;
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(mouseContent));
if (mouseContent) {
if (mouseContent->IsNodeOfType(nsINode::eTEXT)) {
mouseContent = mouseContent->GetParent();
}
if (mouseContent && mouseContent->IsRootOfNativeAnonymousSubtree()) {
mouseContentParent = mouseContent->GetParent();
}
}
switch (aEvent->button) {
case nsMouseEvent::eLeftButton:
if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
mLastLeftMouseDownContent = mouseContent;
mLastLeftMouseDownContentParent = mouseContentParent;
} else if (aEvent->message == NS_MOUSE_BUTTON_UP) {
if (mLastLeftMouseDownContent == mouseContent ||
mLastLeftMouseDownContentParent == mouseContent ||
mLastLeftMouseDownContent == mouseContentParent) {
aEvent->clickCount = mLClickCount;
mLClickCount = 0;
} else {
aEvent->clickCount = 0;
}
mLastLeftMouseDownContent = nullptr;
mLastLeftMouseDownContentParent = nullptr;
}
break;
case nsMouseEvent::eMiddleButton:
if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
mLastMiddleMouseDownContent = mouseContent;
mLastMiddleMouseDownContentParent = mouseContentParent;
} else if (aEvent->message == NS_MOUSE_BUTTON_UP) {
if (mLastMiddleMouseDownContent == mouseContent ||
mLastMiddleMouseDownContentParent == mouseContent ||
mLastMiddleMouseDownContent == mouseContentParent) {
aEvent->clickCount = mMClickCount;
mMClickCount = 0;
} else {
aEvent->clickCount = 0;
}
mLastMiddleMouseDownContent = nullptr;
mLastMiddleMouseDownContentParent = nullptr;
}
break;
case nsMouseEvent::eRightButton:
if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
mLastRightMouseDownContent = mouseContent;
mLastRightMouseDownContentParent = mouseContentParent;
} else if (aEvent->message == NS_MOUSE_BUTTON_UP) {
if (mLastRightMouseDownContent == mouseContent ||
mLastRightMouseDownContentParent == mouseContent ||
mLastRightMouseDownContent == mouseContentParent) {
aEvent->clickCount = mRClickCount;
mRClickCount = 0;
} else {
aEvent->clickCount = 0;
}
mLastRightMouseDownContent = nullptr;
mLastRightMouseDownContentParent = nullptr;
}
break;
}
return NS_OK;
}
nsresult
nsEventStateManager::CheckForAndDispatchClick(nsPresContext* aPresContext,
nsMouseEvent *aEvent,
nsEventStatus* aStatus)
{
nsresult ret = NS_OK;
PRInt32 flags = NS_EVENT_FLAG_NONE;
//If mouse is still over same element, clickcount will be > 1.
//If it has moved it will be zero, so no click.
if (0 != aEvent->clickCount) {
//Check that the window isn't disabled before firing a click
//(see bug 366544).
if (aEvent->widget && !aEvent->widget->IsEnabled()) {
return ret;
}
//fire click
if (aEvent->button == nsMouseEvent::eMiddleButton ||
aEvent->button == nsMouseEvent::eRightButton) {
flags |=
sLeftClickOnly ? NS_EVENT_FLAG_NO_CONTENT_DISPATCH : NS_EVENT_FLAG_NONE;
}
nsMouseEvent event(NS_IS_TRUSTED_EVENT(aEvent), NS_MOUSE_CLICK, aEvent->widget,
nsMouseEvent::eReal);
event.refPoint = aEvent->refPoint;
event.clickCount = aEvent->clickCount;
event.modifiers = aEvent->modifiers;
event.buttons = aEvent->buttons;
event.time = aEvent->time;
event.flags |= flags;
event.button = aEvent->button;
event.inputSource = aEvent->inputSource;
nsCOMPtr<nsIPresShell> presShell = mPresContext->GetPresShell();
if (presShell) {
nsCOMPtr<nsIContent> mouseContent = GetEventTargetContent(aEvent);
ret = presShell->HandleEventWithTarget(&event, mCurrentTarget,
mouseContent, aStatus);
if (NS_SUCCEEDED(ret) && aEvent->clickCount == 2) {
//fire double click
nsMouseEvent event2(NS_IS_TRUSTED_EVENT(aEvent), NS_MOUSE_DOUBLECLICK,
aEvent->widget, nsMouseEvent::eReal);
event2.refPoint = aEvent->refPoint;
event2.clickCount = aEvent->clickCount;
event2.modifiers = aEvent->modifiers;
event2.buttons = aEvent->buttons;
event2.flags |= flags;
event2.button = aEvent->button;
event2.inputSource = aEvent->inputSource;
ret = presShell->HandleEventWithTarget(&event2, mCurrentTarget,
mouseContent, aStatus);
}
}
}
return ret;
}
nsIFrame*
nsEventStateManager::GetEventTarget()
{
nsIPresShell *shell;
if (mCurrentTarget ||
!mPresContext ||
!(shell = mPresContext->GetPresShell())) {
return mCurrentTarget;
}
if (mCurrentTargetContent) {
mCurrentTarget = mPresContext->GetPrimaryFrameFor(mCurrentTargetContent);
if (mCurrentTarget) {
return mCurrentTarget;
}
}
nsIFrame* frame = shell->GetEventTargetFrame();
return (mCurrentTarget = frame);
}
already_AddRefed<nsIContent>
nsEventStateManager::GetEventTargetContent(nsEvent* aEvent)
{
if (aEvent &&
(aEvent->message == NS_FOCUS_CONTENT ||
aEvent->message == NS_BLUR_CONTENT)) {
nsCOMPtr<nsIContent> content = GetFocusedContent();
return content.forget();
}
if (mCurrentTargetContent) {
nsCOMPtr<nsIContent> content = mCurrentTargetContent;
return content.forget();
}
nsIContent *content = nullptr;
nsIPresShell *presShell = mPresContext->GetPresShell();
if (presShell) {
content = presShell->GetEventTargetContent(aEvent).get();
}
// Some events here may set mCurrentTarget but not set the corresponding
// event target in the PresShell.
if (!content && mCurrentTarget) {
mCurrentTarget->GetContentForEvent(aEvent, &content);
}
return content;
}
static Element*
GetLabelTarget(nsIContent* aPossibleLabel)
{
nsHTMLLabelElement* label = nsHTMLLabelElement::FromContent(aPossibleLabel);
if (!label)
return nullptr;
return label->GetLabeledElement();
}
static nsIContent* FindCommonAncestor(nsIContent *aNode1, nsIContent *aNode2)
{
// Find closest common ancestor
if (aNode1 && aNode2) {
// Find the nearest common ancestor by counting the distance to the
// root and then walking up again, in pairs.
PRInt32 offset = 0;
nsIContent *anc1 = aNode1;
for (;;) {
++offset;
nsIContent* parent = anc1->GetParent();
if (!parent)
break;
anc1 = parent;
}
nsIContent *anc2 = aNode2;
for (;;) {
--offset;
nsIContent* parent = anc2->GetParent();
if (!parent)
break;
anc2 = parent;
}
if (anc1 == anc2) {
anc1 = aNode1;
anc2 = aNode2;
while (offset > 0) {
anc1 = anc1->GetParent();
--offset;
}
while (offset < 0) {
anc2 = anc2->GetParent();
++offset;
}
while (anc1 != anc2) {
anc1 = anc1->GetParent();
anc2 = anc2->GetParent();
}
return anc1;
}
}
return nullptr;
}
static Element*
GetParentElement(Element* aElement)
{
nsIContent* p = aElement->GetParent();
return (p && p->IsElement()) ? p->AsElement() : nullptr;
}
/* static */
void
nsEventStateManager::SetFullScreenState(Element* aElement, bool aIsFullScreen)
{
DoStateChange(aElement, NS_EVENT_STATE_FULL_SCREEN, aIsFullScreen);
Element* ancestor = aElement;
while ((ancestor = GetParentElement(ancestor))) {
DoStateChange(ancestor, NS_EVENT_STATE_FULL_SCREEN_ANCESTOR, aIsFullScreen);
}
}
/* static */
inline void
nsEventStateManager::DoStateChange(Element* aElement, nsEventStates aState,
bool aAddState)
{
if (aAddState) {
aElement->AddStates(aState);
} else {
aElement->RemoveStates(aState);
}
}
/* static */
inline void
nsEventStateManager::DoStateChange(nsIContent* aContent, nsEventStates aState,
bool aStateAdded)
{
if (aContent->IsElement()) {
DoStateChange(aContent->AsElement(), aState, aStateAdded);
}
}
/* static */
void
nsEventStateManager::UpdateAncestorState(nsIContent* aStartNode,
nsIContent* aStopBefore,
nsEventStates aState,
bool aAddState)
{
for (; aStartNode && aStartNode != aStopBefore;
aStartNode = aStartNode->GetParent()) {
// We might be starting with a non-element (e.g. a text node) and
// if someone is doing something weird might be ending with a
// non-element too (e.g. a document fragment)
if (!aStartNode->IsElement()) {
continue;
}
Element* element = aStartNode->AsElement();
DoStateChange(element, aState, aAddState);
Element* labelTarget = GetLabelTarget(element);
if (labelTarget) {
DoStateChange(labelTarget, aState, aAddState);
}
}
if (aAddState) {
// We might be in a situation where a node was in hover both
// because it was hovered and because the label for it was
// hovered, and while we stopped hovering the node the label is
// still hovered. Or we might have had two nested labels for the
// same node, and while one is no longer hovered the other still
// is. In that situation, the label that's still hovered will be
// aStopBefore or some ancestor of it, and the call we just made
// to UpdateAncestorState with aAddState = false would have
// removed the hover state from the node. But the node should
// still be in hover state. To handle this situation we need to
// keep walking up the tree and any time we find a label mark its
// corresponding node as still in our state.
for ( ; aStartNode; aStartNode = aStartNode->GetParent()) {
if (!aStartNode->IsElement()) {
continue;
}
Element* labelTarget = GetLabelTarget(aStartNode->AsElement());
if (labelTarget && !labelTarget->State().HasState(aState)) {
DoStateChange(labelTarget, aState, true);
}
}
}
}
bool
nsEventStateManager::SetContentState(nsIContent *aContent, nsEventStates aState)
{
// We manage 4 states here: ACTIVE, HOVER, DRAGOVER, URLTARGET
// The input must be exactly one of them.
NS_PRECONDITION(aState == NS_EVENT_STATE_ACTIVE ||
aState == NS_EVENT_STATE_HOVER ||
aState == NS_EVENT_STATE_DRAGOVER ||
aState == NS_EVENT_STATE_URLTARGET,
"Unexpected state");
nsCOMPtr<nsIContent> notifyContent1;
nsCOMPtr<nsIContent> notifyContent2;
bool updateAncestors;
if (aState == NS_EVENT_STATE_HOVER || aState == NS_EVENT_STATE_ACTIVE) {
// Hover and active are hierarchical
updateAncestors = true;
// check to see that this state is allowed by style. Check dragover too?
// XXX Is this even what we want?
if (mCurrentTarget)
{
const nsStyleUserInterface* ui = mCurrentTarget->GetStyleUserInterface();
if (ui->mUserInput == NS_STYLE_USER_INPUT_NONE)
return false;
}
if (aState == NS_EVENT_STATE_ACTIVE) {
if (aContent != mActiveContent) {
notifyContent1 = aContent;
notifyContent2 = mActiveContent;
mActiveContent = aContent;
}
} else {
NS_ASSERTION(aState == NS_EVENT_STATE_HOVER, "How did that happen?");
nsIContent* newHover;
if (mPresContext->IsDynamic()) {
newHover = aContent;
} else {
NS_ASSERTION(!aContent ||
aContent->GetCurrentDoc() == mPresContext->PresShell()->GetDocument(),
"Unexpected document");
nsIFrame *frame = aContent ? aContent->GetPrimaryFrame() : nullptr;
if (frame && nsLayoutUtils::IsViewportScrollbarFrame(frame)) {
// The scrollbars of viewport should not ignore the hover state.
// Because they are *not* the content of the web page.
newHover = aContent;
} else {
// All contents of the web page should ignore the hover state.
newHover = nullptr;
}
}
if (newHover != mHoverContent) {
notifyContent1 = newHover;
notifyContent2 = mHoverContent;
mHoverContent = newHover;
}
}
} else {
updateAncestors = false;
if (aState == NS_EVENT_STATE_DRAGOVER) {
if (aContent != sDragOverContent) {
notifyContent1 = aContent;
notifyContent2 = sDragOverContent;
sDragOverContent = aContent;
}
} else if (aState == NS_EVENT_STATE_URLTARGET) {
if (aContent != mURLTargetContent) {
notifyContent1 = aContent;
notifyContent2 = mURLTargetContent;
mURLTargetContent = aContent;
}
}
}
// We need to keep track of which of notifyContent1 and notifyContent2 is
// getting the state set and which is getting it unset. If both are
// non-null, then notifyContent1 is having the state set and notifyContent2
// is having it unset. But if one of them is null, we need to keep track of
// the right thing for notifyContent1 explicitly.
bool content1StateSet = true;
if (!notifyContent1) {
// This is ok because FindCommonAncestor wouldn't find anything
// anyway if notifyContent1 is null.
notifyContent1 = notifyContent2;
notifyContent2 = nullptr;
content1StateSet = false;
}
if (notifyContent1 && mPresContext) {
EnsureDocument(mPresContext);
if (mDocument) {
nsAutoScriptBlocker scriptBlocker;
if (updateAncestors) {
nsCOMPtr<nsIContent> commonAncestor =
FindCommonAncestor(notifyContent1, notifyContent2);
if (notifyContent2) {
// It's very important to first notify the state removal and
// then the state addition, because due to labels it's
// possible that we're removing state from some element but
// then adding it again (say because mHoverContent changed
// from a control to its label).
UpdateAncestorState(notifyContent2, commonAncestor, aState, false);
}
UpdateAncestorState(notifyContent1, commonAncestor, aState,
content1StateSet);
} else {
if (notifyContent2) {
DoStateChange(notifyContent2, aState, false);
}
DoStateChange(notifyContent1, aState, content1StateSet);
}
}
}
return true;
}
void
nsEventStateManager::ContentRemoved(nsIDocument* aDocument, nsIContent* aContent)
{
/*
* Anchor and area elements when focused or hovered might make the UI to show
* the current link. We want to make sure that the UI gets informed when they
* are actually removed from the DOM.
*/
if (aContent->IsHTML() &&
(aContent->Tag() == nsGkAtoms::a || aContent->Tag() == nsGkAtoms::area) &&
(aContent->AsElement()->State().HasAtLeastOneOfStates(NS_EVENT_STATE_FOCUS |
NS_EVENT_STATE_HOVER))) {
nsGenericHTMLElement* element = static_cast<nsGenericHTMLElement*>(aContent);
element->LeaveLink(element->GetPresContext());
}
// inform the focus manager that the content is being removed. If this
// content is focused, the focus will be removed without firing events.
nsFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm)
fm->ContentRemoved(aDocument, aContent);
if (mHoverContent &&
nsContentUtils::ContentIsDescendantOf(mHoverContent, aContent)) {
// Since hover is hierarchical, set the current hover to the
// content's parent node.
SetContentState(aContent->GetParent(), NS_EVENT_STATE_HOVER);
}
if (mActiveContent &&
nsContentUtils::ContentIsDescendantOf(mActiveContent, aContent)) {
// Active is hierarchical, so set the current active to the
// content's parent node.
SetContentState(aContent->GetParent(), NS_EVENT_STATE_ACTIVE);
}
if (sDragOverContent &&
sDragOverContent->OwnerDoc() == aContent->OwnerDoc() &&
nsContentUtils::ContentIsDescendantOf(sDragOverContent, aContent)) {
sDragOverContent = nullptr;
}
if (mLastMouseOverElement &&
nsContentUtils::ContentIsDescendantOf(mLastMouseOverElement, aContent)) {
// See bug 292146 for why we want to null this out
mLastMouseOverElement = nullptr;
}
}
bool
nsEventStateManager::EventStatusOK(nsGUIEvent* aEvent)
{
return !(aEvent->message == NS_MOUSE_BUTTON_DOWN &&
static_cast<nsMouseEvent*>(aEvent)->button == nsMouseEvent::eLeftButton &&
!sNormalLMouseEventInProcess);
}
//-------------------------------------------
// Access Key Registration
//-------------------------------------------
void
nsEventStateManager::RegisterAccessKey(nsIContent* aContent, PRUint32 aKey)
{
if (aContent && mAccessKeys.IndexOf(aContent) == -1)
mAccessKeys.AppendObject(aContent);
}
void
nsEventStateManager::UnregisterAccessKey(nsIContent* aContent, PRUint32 aKey)
{
if (aContent)
mAccessKeys.RemoveObject(aContent);
}
PRUint32
nsEventStateManager::GetRegisteredAccessKey(nsIContent* aContent)
{
NS_ENSURE_ARG(aContent);
if (mAccessKeys.IndexOf(aContent) == -1)
return 0;
nsAutoString accessKey;
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, accessKey);
return accessKey.First();
}
void
nsEventStateManager::EnsureDocument(nsPresContext* aPresContext)
{
if (!mDocument)
mDocument = aPresContext->Document();
}
void
nsEventStateManager::FlushPendingEvents(nsPresContext* aPresContext)
{
NS_PRECONDITION(nullptr != aPresContext, "nullptr ptr");
nsIPresShell *shell = aPresContext->GetPresShell();
if (shell) {
shell->FlushPendingNotifications(Flush_InterruptibleLayout);
}
}
nsIContent*
nsEventStateManager::GetFocusedContent()
{
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (!fm || !mDocument)
return nullptr;
nsCOMPtr<nsPIDOMWindow> focusedWindow;
return nsFocusManager::GetFocusedDescendant(mDocument->GetWindow(), false,
getter_AddRefs(focusedWindow));
}
//-------------------------------------------------------
// Return true if the docshell is visible
bool
nsEventStateManager::IsShellVisible(nsIDocShell* aShell)
{
NS_ASSERTION(aShell, "docshell is null");
nsCOMPtr<nsIBaseWindow> basewin = do_QueryInterface(aShell);
if (!basewin)
return true;
bool isVisible = true;
basewin->GetVisibility(&isVisible);
// We should be doing some additional checks here so that
// we don't tab into hidden tabs of tabbrowser. -bryner
return isVisible;
}
nsresult
nsEventStateManager::DoContentCommandEvent(nsContentCommandEvent* aEvent)
{
EnsureDocument(mPresContext);
NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
nsCOMPtr<nsPIDOMWindow> window(mDocument->GetWindow());
NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
nsCOMPtr<nsPIWindowRoot> root = window->GetTopWindowRoot();
NS_ENSURE_TRUE(root, NS_ERROR_FAILURE);
const char* cmd;
switch (aEvent->message) {
case NS_CONTENT_COMMAND_CUT:
cmd = "cmd_cut";
break;
case NS_CONTENT_COMMAND_COPY:
cmd = "cmd_copy";
break;
case NS_CONTENT_COMMAND_PASTE:
cmd = "cmd_paste";
break;
case NS_CONTENT_COMMAND_DELETE:
cmd = "cmd_delete";
break;
case NS_CONTENT_COMMAND_UNDO:
cmd = "cmd_undo";
break;
case NS_CONTENT_COMMAND_REDO:
cmd = "cmd_redo";
break;
case NS_CONTENT_COMMAND_PASTE_TRANSFERABLE:
cmd = "cmd_pasteTransferable";
break;
default:
return NS_ERROR_NOT_IMPLEMENTED;
}
nsCOMPtr<nsIController> controller;
nsresult rv = root->GetControllerForCommand(cmd, getter_AddRefs(controller));
NS_ENSURE_SUCCESS(rv, rv);
if (!controller) {
// When GetControllerForCommand succeeded but there is no controller, the
// command isn't supported.
aEvent->mIsEnabled = false;
} else {
bool canDoIt;
rv = controller->IsCommandEnabled(cmd, &canDoIt);
NS_ENSURE_SUCCESS(rv, rv);
aEvent->mIsEnabled = canDoIt;
if (canDoIt && !aEvent->mOnlyEnabledCheck) {
switch (aEvent->message) {
case NS_CONTENT_COMMAND_PASTE_TRANSFERABLE: {
nsCOMPtr<nsICommandController> commandController = do_QueryInterface(controller);
NS_ENSURE_STATE(commandController);
nsCOMPtr<nsICommandParams> params = do_CreateInstance("@mozilla.org/embedcomp/command-params;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = params->SetISupportsValue("transferable", aEvent->mTransferable);
NS_ENSURE_SUCCESS(rv, rv);
rv = commandController->DoCommandWithParams(cmd, params);
break;
}
default:
rv = controller->DoCommand(cmd);
break;
}
NS_ENSURE_SUCCESS(rv, rv);
}
}
aEvent->mSucceeded = true;
return NS_OK;
}
nsresult
nsEventStateManager::DoContentCommandScrollEvent(nsContentCommandEvent* aEvent)
{
NS_ENSURE_TRUE(mPresContext, NS_ERROR_NOT_AVAILABLE);
nsIPresShell* ps = mPresContext->GetPresShell();
NS_ENSURE_TRUE(ps, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_TRUE(aEvent->mScroll.mAmount != 0, NS_ERROR_INVALID_ARG);
nsIScrollableFrame::ScrollUnit scrollUnit;
switch (aEvent->mScroll.mUnit) {
case nsContentCommandEvent::eCmdScrollUnit_Line:
scrollUnit = nsIScrollableFrame::LINES;
break;
case nsContentCommandEvent::eCmdScrollUnit_Page:
scrollUnit = nsIScrollableFrame::PAGES;
break;
case nsContentCommandEvent::eCmdScrollUnit_Whole:
scrollUnit = nsIScrollableFrame::WHOLE;
break;
default:
return NS_ERROR_INVALID_ARG;
}
aEvent->mSucceeded = true;
nsIScrollableFrame* sf =
ps->GetFrameToScrollAsScrollable(nsIPresShell::eEither);
aEvent->mIsEnabled = sf ? CanScrollOn(sf, aEvent->mScroll.mAmount,
aEvent->mScroll.mIsHorizontal) :
false;
if (!aEvent->mIsEnabled || aEvent->mOnlyEnabledCheck) {
return NS_OK;
}
nsIntPoint pt(0, 0);
if (aEvent->mScroll.mIsHorizontal) {
pt.x = aEvent->mScroll.mAmount;
} else {
pt.y = aEvent->mScroll.mAmount;
}
// The caller may want synchronous scrolling.
sf->ScrollBy(pt, scrollUnit, nsIScrollableFrame::INSTANT);
return NS_OK;
}
void
nsEventStateManager::DoQueryScrollTargetInfo(nsQueryContentEvent* aEvent,
nsIFrame* aTargetFrame)
{
// Don't modify the test event which in mInput.
nsMouseScrollEvent msEvent(
NS_IS_TRUSTED_EVENT(aEvent->mInput.mMouseScrollEvent),
aEvent->mInput.mMouseScrollEvent->message,
aEvent->mInput.mMouseScrollEvent->widget);
msEvent.modifiers = aEvent->mInput.mMouseScrollEvent->modifiers;
msEvent.buttons = aEvent->mInput.mMouseScrollEvent->buttons;
msEvent.scrollFlags = aEvent->mInput.mMouseScrollEvent->scrollFlags;
msEvent.delta = ComputeWheelDeltaFor(aEvent->mInput.mMouseScrollEvent);
msEvent.scrollOverflow = aEvent->mInput.mMouseScrollEvent->scrollOverflow;
bool useSystemSettings = UseSystemScrollSettingFor(&msEvent);
nsIScrollableFrame::ScrollUnit unit;
bool allowOverrideSystemSettings;
switch (ComputeWheelActionFor(&msEvent, useSystemSettings)) {
case MOUSE_SCROLL_N_LINES:
unit = nsIScrollableFrame::LINES;
allowOverrideSystemSettings = useSystemSettings;
break;
case MOUSE_SCROLL_PAGE:
unit = nsIScrollableFrame::PAGES;
allowOverrideSystemSettings = false;
break;
default:
// Don't use high resolution scrolling when the action doesn't scroll
// contents.
return;
}
DoScrollText(aTargetFrame, &msEvent, unit,
allowOverrideSystemSettings, aEvent);
}
void
nsEventStateManager::DoQuerySelectedText(nsQueryContentEvent* aEvent)
{
if (RemoteQueryContentEvent(aEvent)) {
return;
}
nsContentEventHandler handler(mPresContext);
handler.OnQuerySelectedText(aEvent);
}
void
nsEventStateManager::SetActiveManager(nsEventStateManager* aNewESM,
nsIContent* aContent)
{
if (sActiveESM && aNewESM != sActiveESM) {
sActiveESM->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
}
sActiveESM = aNewESM;
if (sActiveESM && aContent) {
sActiveESM->SetContentState(aContent, NS_EVENT_STATE_ACTIVE);
}
}
void
nsEventStateManager::ClearGlobalActiveContent(nsEventStateManager* aClearer)
{
if (aClearer) {
aClearer->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
if (sDragOverContent) {
aClearer->SetContentState(nullptr, NS_EVENT_STATE_DRAGOVER);
}
}
if (sActiveESM && aClearer != sActiveESM) {
sActiveESM->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
}
sActiveESM = nullptr;
}
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