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gecko/layout/base/nsPresShell.h
Kartikaya Gupta 04cafb7401 Bug 1178847 - Add a MobileViewportManager to manage setting the CSS viewport on B2G. r=botond,tn 
The MobileViewportManager ("MVM") is responsible for setting the CSS viewport on
any of the following events:
- a page is painted for the first time (on the before-first-paint event)
- a meta-viewport tag is added (on the DOMMetaAdded event)
- the full-zoom is changed (on the FullZoomChanged event)
- if the window is resized (ResizeReflow gets called as part of normal layout
  processing, and this will pick up a new CSS viewport from MVM)

If the CSS viewport changes or if it is the initial paint, the MVM additionally
calls SetResolutionAndScaleTo on the presShell to update the displayed zoom.
The APZ code in AsyncPanZoomController::NotifyLayersUpdated already has
corresponding code to accept this updated zoom when the CSS viewport changes.
2015-07-21 10:51:55 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 05/03/2000 IBM Corp. Observer events for reflow states
*/
/* a presentation of a document, part 2 */
#ifndef nsPresShell_h_
#define nsPresShell_h_
#include "nsIPresShell.h"
#include "nsStubDocumentObserver.h"
#include "nsISelectionController.h"
#include "nsIObserver.h"
#include "nsWeakReference.h"
#include "nsCRT.h"
#include "nsAutoPtr.h"
#include "nsIWidget.h"
#include "nsStyleSet.h"
#include "nsContentUtils.h" // For AddScriptBlocker().
#include "nsRefreshDriver.h"
#include "TouchManager.h"
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"
#include "mozilla/MemoryReporting.h"
#include "MobileViewportManager.h"
#include "ZoomConstraintsClient.h"
class nsRange;
struct RangePaintInfo;
struct nsCallbackEventRequest;
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
#endif
class nsPresShellEventCB;
class nsAutoCauseReflowNotifier;
namespace mozilla {
class CSSStyleSheet;
class EventDispatchingCallback;
} // namespace mozilla
// 250ms. This is actually pref-controlled, but we use this value if we fail
// to get the pref for any reason.
#define PAINTLOCK_EVENT_DELAY 250
class PresShell final : public nsIPresShell,
public nsStubDocumentObserver,
public nsISelectionController,
public nsIObserver,
public nsSupportsWeakReference
{
public:
PresShell();
NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
// nsISupports
NS_DECL_ISUPPORTS
// Touch caret preference
static bool TouchCaretPrefEnabled();
// Selection caret preference
static bool SelectionCaretPrefEnabled();
static bool AccessibleCaretEnabled();
// BeforeAfterKeyboardEvent preference
static bool BeforeAfterKeyboardEventEnabled();
void Init(nsIDocument* aDocument, nsPresContext* aPresContext,
nsViewManager* aViewManager, nsStyleSet* aStyleSet,
nsCompatibility aCompatMode);
virtual void Destroy() override;
virtual void MakeZombie() override;
virtual void UpdatePreferenceStyles() override;
NS_IMETHOD GetSelection(SelectionType aType, nsISelection** aSelection) override;
virtual mozilla::dom::Selection* GetCurrentSelection(SelectionType aType) override;
NS_IMETHOD SetDisplaySelection(int16_t aToggle) override;
NS_IMETHOD GetDisplaySelection(int16_t *aToggle) override;
NS_IMETHOD ScrollSelectionIntoView(SelectionType aType, SelectionRegion aRegion,
int16_t aFlags) override;
NS_IMETHOD RepaintSelection(SelectionType aType) override;
virtual void BeginObservingDocument() override;
virtual void EndObservingDocument() override;
virtual nsresult Initialize(nscoord aWidth, nscoord aHeight) override;
virtual nsresult ResizeReflow(nscoord aWidth, nscoord aHeight) override;
virtual nsresult ResizeReflowOverride(nscoord aWidth, nscoord aHeight) override;
virtual nsresult ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight) override;
virtual nsIPageSequenceFrame* GetPageSequenceFrame() const override;
virtual nsCanvasFrame* GetCanvasFrame() const override;
virtual nsIFrame* GetRealPrimaryFrameFor(nsIContent* aContent) const override;
virtual nsIFrame* GetPlaceholderFrameFor(nsIFrame* aFrame) const override;
virtual void FrameNeedsReflow(nsIFrame *aFrame, IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd,
ReflowRootHandling aRootHandling =
eInferFromBitToAdd) override;
virtual void FrameNeedsToContinueReflow(nsIFrame *aFrame) override;
virtual void CancelAllPendingReflows() override;
virtual bool IsSafeToFlush() const override;
virtual void FlushPendingNotifications(mozFlushType aType) override;
virtual void FlushPendingNotifications(mozilla::ChangesToFlush aType) override;
virtual void DestroyFramesFor(nsIContent* aContent,
nsIContent** aDestroyedFramesFor) override;
virtual void CreateFramesFor(nsIContent* aContent) override;
/**
* Recreates the frames for a node
*/
virtual nsresult RecreateFramesFor(nsIContent* aContent) override;
/**
* Post a callback that should be handled after reflow has finished.
*/
virtual nsresult PostReflowCallback(nsIReflowCallback* aCallback) override;
virtual void CancelReflowCallback(nsIReflowCallback* aCallback) override;
virtual void ClearFrameRefs(nsIFrame* aFrame) override;
virtual already_AddRefed<gfxContext> CreateReferenceRenderingContext() override;
virtual nsresult GoToAnchor(const nsAString& aAnchorName, bool aScroll,
uint32_t aAdditionalScrollFlags = 0) override;
virtual nsresult ScrollToAnchor() override;
virtual nsresult ScrollContentIntoView(nsIContent* aContent,
ScrollAxis aVertical,
ScrollAxis aHorizontal,
uint32_t aFlags) override;
virtual bool ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
ScrollAxis aVertical,
ScrollAxis aHorizontal,
uint32_t aFlags) override;
virtual nsRectVisibility GetRectVisibility(nsIFrame *aFrame,
const nsRect &aRect,
nscoord aMinTwips) const override;
virtual void SetIgnoreFrameDestruction(bool aIgnore) override;
virtual void NotifyDestroyingFrame(nsIFrame* aFrame) override;
virtual nsresult CaptureHistoryState(nsILayoutHistoryState** aLayoutHistoryState) override;
virtual void UnsuppressPainting() override;
virtual nsresult GetAgentStyleSheets(nsCOMArray<nsIStyleSheet>& aSheets) override;
virtual nsresult SetAgentStyleSheets(const nsCOMArray<nsIStyleSheet>& aSheets) override;
virtual nsresult AddOverrideStyleSheet(nsIStyleSheet *aSheet) override;
virtual nsresult RemoveOverrideStyleSheet(nsIStyleSheet *aSheet) override;
virtual nsresult HandleEventWithTarget(
mozilla::WidgetEvent* aEvent,
nsIFrame* aFrame,
nsIContent* aContent,
nsEventStatus* aStatus) override;
virtual nsIFrame* GetEventTargetFrame() override;
virtual already_AddRefed<nsIContent> GetEventTargetContent(
mozilla::WidgetEvent* aEvent) override;
virtual void NotifyCounterStylesAreDirty() override;
virtual nsresult ReconstructFrames(void) override;
virtual void Freeze() override;
virtual void Thaw() override;
virtual void FireOrClearDelayedEvents(bool aFireEvents) override;
virtual nsresult RenderDocument(const nsRect& aRect, uint32_t aFlags,
nscolor aBackgroundColor,
gfxContext* aThebesContext) override;
virtual already_AddRefed<SourceSurface>
RenderNode(nsIDOMNode* aNode,
nsIntRegion* aRegion,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags) override;
virtual already_AddRefed<SourceSurface>
RenderSelection(nsISelection* aSelection,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags) override;
virtual already_AddRefed<nsPIDOMWindow> GetRootWindow() override;
virtual LayerManager* GetLayerManager() override;
virtual bool AsyncPanZoomEnabled() override;
virtual void SetIgnoreViewportScrolling(bool aIgnore) override;
virtual nsresult SetResolution(float aResolution) override {
return SetResolutionImpl(aResolution, /* aScaleToResolution = */ false);
}
virtual nsresult SetResolutionAndScaleTo(float aResolution) override {
return SetResolutionImpl(aResolution, /* aScaleToResolution = */ true);
}
virtual bool ScaleToResolution() const override;
virtual float GetCumulativeResolution() override;
//nsIViewObserver interface
virtual void Paint(nsView* aViewToPaint, const nsRegion& aDirtyRegion,
uint32_t aFlags) override;
virtual nsresult HandleEvent(nsIFrame* aFrame,
mozilla::WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus,
nsIContent** aTargetContent) override;
virtual nsresult HandleDOMEventWithTarget(
nsIContent* aTargetContent,
mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus) override;
virtual nsresult HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsIDOMEvent* aEvent,
nsEventStatus* aStatus) override;
virtual bool ShouldIgnoreInvalidation() override;
virtual void WillPaint() override;
virtual void WillPaintWindow() override;
virtual void DidPaintWindow() override;
virtual void ScheduleViewManagerFlush(PaintType aType = PAINT_DEFAULT) override;
virtual void DispatchSynthMouseMove(mozilla::WidgetGUIEvent* aEvent,
bool aFlushOnHoverChange) override;
virtual void ClearMouseCaptureOnView(nsView* aView) override;
virtual bool IsVisible() override;
// touch caret
virtual already_AddRefed<mozilla::TouchCaret> GetTouchCaret() const override;
virtual mozilla::dom::Element* GetTouchCaretElement() const override;
// selection caret
virtual already_AddRefed<mozilla::SelectionCarets> GetSelectionCarets() const override;
virtual mozilla::dom::Element* GetSelectionCaretsStartElement() const override;
virtual mozilla::dom::Element* GetSelectionCaretsEndElement() const override;
virtual already_AddRefed<mozilla::AccessibleCaretEventHub> GetAccessibleCaretEventHub() const override;
// caret handling
virtual already_AddRefed<nsCaret> GetCaret() const override;
NS_IMETHOD SetCaretEnabled(bool aInEnable) override;
NS_IMETHOD SetCaretReadOnly(bool aReadOnly) override;
NS_IMETHOD GetCaretEnabled(bool *aOutEnabled) override;
NS_IMETHOD SetCaretVisibilityDuringSelection(bool aVisibility) override;
NS_IMETHOD GetCaretVisible(bool *_retval) override;
virtual void SetCaret(nsCaret *aNewCaret) override;
virtual void RestoreCaret() override;
NS_IMETHOD SetSelectionFlags(int16_t aInEnable) override;
NS_IMETHOD GetSelectionFlags(int16_t *aOutEnable) override;
// nsISelectionController
NS_IMETHOD PhysicalMove(int16_t aDirection, int16_t aAmount, bool aExtend) override;
NS_IMETHOD CharacterMove(bool aForward, bool aExtend) override;
NS_IMETHOD CharacterExtendForDelete() override;
NS_IMETHOD CharacterExtendForBackspace() override;
NS_IMETHOD WordMove(bool aForward, bool aExtend) override;
NS_IMETHOD WordExtendForDelete(bool aForward) override;
NS_IMETHOD LineMove(bool aForward, bool aExtend) override;
NS_IMETHOD IntraLineMove(bool aForward, bool aExtend) override;
NS_IMETHOD PageMove(bool aForward, bool aExtend) override;
NS_IMETHOD ScrollPage(bool aForward) override;
NS_IMETHOD ScrollLine(bool aForward) override;
NS_IMETHOD ScrollCharacter(bool aRight) override;
NS_IMETHOD CompleteScroll(bool aForward) override;
NS_IMETHOD CompleteMove(bool aForward, bool aExtend) override;
NS_IMETHOD SelectAll() override;
NS_IMETHOD CheckVisibility(nsIDOMNode *node, int16_t startOffset, int16_t EndOffset, bool *_retval) override;
virtual nsresult CheckVisibilityContent(nsIContent* aNode, int16_t aStartOffset,
int16_t aEndOffset, bool* aRetval) override;
NS_IMETHOD GetSelectionCaretsVisibility(bool* aOutVisibility) override;
NS_IMETHOD SetSelectionCaretsVisibility(bool aVisibility) override;
// nsIDocumentObserver
NS_DECL_NSIDOCUMENTOBSERVER_BEGINUPDATE
NS_DECL_NSIDOCUMENTOBSERVER_ENDUPDATE
NS_DECL_NSIDOCUMENTOBSERVER_BEGINLOAD
NS_DECL_NSIDOCUMENTOBSERVER_ENDLOAD
NS_DECL_NSIDOCUMENTOBSERVER_CONTENTSTATECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_DOCUMENTSTATESCHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETADDED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETREMOVED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETAPPLICABLESTATECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULEADDED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULEREMOVED
// nsIMutationObserver
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
NS_DECL_NSIOBSERVER
#ifdef MOZ_REFLOW_PERF
virtual void DumpReflows() override;
virtual void CountReflows(const char * aName, nsIFrame * aFrame) override;
virtual void PaintCount(const char * aName,
nsRenderingContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame * aFrame,
const nsPoint& aOffset,
uint32_t aColor) override;
virtual void SetPaintFrameCount(bool aOn) override;
virtual bool IsPaintingFrameCounts() override;
#endif
#ifdef DEBUG
virtual void ListStyleContexts(nsIFrame *aRootFrame, FILE *out,
int32_t aIndent = 0) override;
virtual void ListStyleSheets(FILE *out, int32_t aIndent = 0) override;
virtual void VerifyStyleTree() override;
#endif
static PRLogModuleInfo* gLog;
virtual void DisableNonTestMouseEvents(bool aDisable) override;
virtual void UpdateCanvasBackground() override;
virtual void AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor,
uint32_t aFlags) override;
virtual void AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds) override;
virtual nscolor ComputeBackstopColor(nsView* aDisplayRoot) override;
virtual nsresult SetIsActive(bool aIsActive) override;
virtual bool GetIsViewportOverridden() override {
return mViewportOverridden || (mMobileViewportManager != nullptr);
}
virtual bool IsLayoutFlushObserver() override
{
return GetPresContext()->RefreshDriver()->
IsLayoutFlushObserver(this);
}
virtual void LoadComplete() override;
void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
nsArenaMemoryStats *aArenaObjectsSize,
size_t *aPresShellSize,
size_t *aStyleSetsSize,
size_t *aTextRunsSize,
size_t *aPresContextSize) override;
size_t SizeOfTextRuns(mozilla::MallocSizeOf aMallocSizeOf) const;
virtual void AddInvalidateHiddenPresShellObserver(nsRefreshDriver *aDriver) override;
// This data is stored as a content property (nsGkAtoms::scrolling) on
// mContentToScrollTo when we have a pending ScrollIntoView.
struct ScrollIntoViewData {
ScrollAxis mContentScrollVAxis;
ScrollAxis mContentScrollHAxis;
uint32_t mContentToScrollToFlags;
};
virtual void ScheduleImageVisibilityUpdate() override;
virtual void RebuildImageVisibilityDisplayList(const nsDisplayList& aList) override;
virtual void RebuildImageVisibility(nsRect* aRect = nullptr) override;
virtual void EnsureImageInVisibleList(nsIImageLoadingContent* aImage) override;
virtual void RemoveImageFromVisibleList(nsIImageLoadingContent* aImage) override;
virtual bool AssumeAllImagesVisible() override;
virtual void RecordShadowStyleChange(mozilla::dom::ShadowRoot* aShadowRoot) override;
virtual void DispatchAfterKeyboardEvent(nsINode* aTarget,
const mozilla::WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled) override;
void SetNextPaintCompressed() { mNextPaintCompressed = true; }
protected:
virtual ~PresShell();
void HandlePostedReflowCallbacks(bool aInterruptible);
void CancelPostedReflowCallbacks();
void UnsuppressAndInvalidate();
void WillCauseReflow() {
nsContentUtils::AddScriptBlocker();
++mChangeNestCount;
}
nsresult DidCauseReflow();
friend class nsAutoCauseReflowNotifier;
nsresult DispatchEventToDOM(mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB);
void DispatchTouchEventToDOM(mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB,
bool aTouchIsNew);
void WillDoReflow();
/**
* Callback handler for whether reflow happened.
*
* @param aInterruptible Whether or not reflow interruption is allowed.
* @param aWasInterrupted Whether or not the reflow was interrupted earlier.
*
*/
void DidDoReflow(bool aInterruptible, bool aWasInterrupted);
// ProcessReflowCommands returns whether we processed all our dirty roots
// without interruptions.
bool ProcessReflowCommands(bool aInterruptible);
// MaybeScheduleReflow checks if posting a reflow is needed, then checks if
// the last reflow was interrupted. In the interrupted case ScheduleReflow is
// called off a timer, otherwise it is called directly.
void MaybeScheduleReflow();
// Actually schedules a reflow. This should only be called by
// MaybeScheduleReflow and the reflow timer ScheduleReflowOffTimer
// sets up.
void ScheduleReflow();
// DoReflow returns whether the reflow finished without interruption
bool DoReflow(nsIFrame* aFrame, bool aInterruptible);
#ifdef DEBUG
void DoVerifyReflow();
void VerifyHasDirtyRootAncestor(nsIFrame* aFrame);
#endif
// Helper for ScrollContentIntoView
void DoScrollContentIntoView();
/**
* Initialize cached font inflation preference values and do an initial
* computation to determine if font inflation is enabled.
*
* @see nsLayoutUtils::sFontSizeInflationEmPerLine
* @see nsLayoutUtils::sFontSizeInflationMinTwips
* @see nsLayoutUtils::sFontSizeInflationLineThreshold
*/
void SetupFontInflation();
friend struct AutoRenderingStateSaveRestore;
friend struct RenderingState;
struct RenderingState {
explicit RenderingState(PresShell* aPresShell)
: mResolution(aPresShell->mResolution)
, mRenderFlags(aPresShell->mRenderFlags)
{ }
float mResolution;
RenderFlags mRenderFlags;
};
struct AutoSaveRestoreRenderingState {
explicit AutoSaveRestoreRenderingState(PresShell* aPresShell)
: mPresShell(aPresShell)
, mOldState(aPresShell)
{}
~AutoSaveRestoreRenderingState()
{
mPresShell->mRenderFlags = mOldState.mRenderFlags;
mPresShell->mResolution = mOldState.mResolution;
}
PresShell* mPresShell;
RenderingState mOldState;
};
static RenderFlags ChangeFlag(RenderFlags aFlags, bool aOnOff,
eRenderFlag aFlag)
{
return aOnOff ? (aFlags | aFlag) : (aFlag & ~aFlag);
}
void SetRenderingState(const RenderingState& aState);
friend class nsPresShellEventCB;
bool mCaretEnabled;
#ifdef DEBUG
nsStyleSet* CloneStyleSet(nsStyleSet* aSet);
bool VerifyIncrementalReflow();
bool mInVerifyReflow;
void ShowEventTargetDebug();
#endif
void RecordStyleSheetChange(nsIStyleSheet* aStyleSheet);
void RemovePreferenceStyles();
// methods for painting a range to an offscreen buffer
// given a display list, clip the items within the list to
// the range
nsRect ClipListToRange(nsDisplayListBuilder *aBuilder,
nsDisplayList* aList,
nsRange* aRange);
// create a RangePaintInfo for the range aRange containing the
// display list needed to paint the range to a surface
RangePaintInfo* CreateRangePaintInfo(nsIDOMRange* aRange,
nsRect& aSurfaceRect,
bool aForPrimarySelection);
/*
* Paint the items to a new surface and return it.
*
* aSelection - selection being painted, if any
* aRegion - clip region, if any
* aArea - area that the surface occupies, relative to the root frame
* aPoint - reference point, typically the mouse position
* aScreenRect - [out] set to the area of the screen the painted area should
* be displayed at
* aFlags - set RENDER_AUTO_SCALE to scale down large images, but it must not
* be set if a custom image was specified
*/
already_AddRefed<SourceSurface>
PaintRangePaintInfo(nsTArray<nsAutoPtr<RangePaintInfo> >* aItems,
nsISelection* aSelection,
nsIntRegion* aRegion,
nsRect aArea,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags);
/**
* Methods to handle changes to user and UA sheet lists that we get
* notified about.
*/
void AddUserSheet(nsISupports* aSheet);
void AddAgentSheet(nsISupports* aSheet);
void AddAuthorSheet(nsISupports* aSheet);
void RemoveSheet(nsStyleSet::sheetType aType, nsISupports* aSheet);
// Hide a view if it is a popup
void HideViewIfPopup(nsView* aView);
// Utility method to restore the root scrollframe state
void RestoreRootScrollPosition();
void MaybeReleaseCapturingContent();
nsresult HandleRetargetedEvent(mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsIContent* aTarget)
{
PushCurrentEventInfo(nullptr, nullptr);
mCurrentEventContent = aTarget;
nsresult rv = NS_OK;
if (GetCurrentEventFrame()) {
rv = HandleEventInternal(aEvent, aStatus);
}
PopCurrentEventInfo();
return rv;
}
class DelayedEvent
{
public:
virtual ~DelayedEvent() { }
virtual void Dispatch() { }
};
class DelayedInputEvent : public DelayedEvent
{
public:
virtual void Dispatch() override;
protected:
DelayedInputEvent();
virtual ~DelayedInputEvent();
mozilla::WidgetInputEvent* mEvent;
};
class DelayedMouseEvent : public DelayedInputEvent
{
public:
explicit DelayedMouseEvent(mozilla::WidgetMouseEvent* aEvent);
};
class DelayedKeyEvent : public DelayedInputEvent
{
public:
explicit DelayedKeyEvent(mozilla::WidgetKeyboardEvent* aEvent);
};
// Check if aEvent is a mouse event and record the mouse location for later
// synth mouse moves.
void RecordMouseLocation(mozilla::WidgetGUIEvent* aEvent);
class nsSynthMouseMoveEvent final : public nsARefreshObserver {
public:
nsSynthMouseMoveEvent(PresShell* aPresShell, bool aFromScroll)
: mPresShell(aPresShell), mFromScroll(aFromScroll) {
NS_ASSERTION(mPresShell, "null parameter");
}
private:
// Private destructor, to discourage deletion outside of Release():
~nsSynthMouseMoveEvent() {
Revoke();
}
public:
NS_INLINE_DECL_REFCOUNTING(nsSynthMouseMoveEvent, override)
void Revoke() {
if (mPresShell) {
mPresShell->GetPresContext()->RefreshDriver()->
RemoveRefreshObserver(this, Flush_Display);
mPresShell = nullptr;
}
}
virtual void WillRefresh(mozilla::TimeStamp aTime) override {
if (mPresShell) {
nsRefPtr<PresShell> shell = mPresShell;
shell->ProcessSynthMouseMoveEvent(mFromScroll);
}
}
private:
PresShell* mPresShell;
bool mFromScroll;
};
void ProcessSynthMouseMoveEvent(bool aFromScroll);
void QueryIsActive();
nsresult UpdateImageLockingState();
#ifdef ANDROID
nsIDocument* GetTouchEventTargetDocument();
#endif
bool InZombieDocument(nsIContent *aContent);
already_AddRefed<nsIPresShell> GetParentPresShellForEventHandling();
nsIContent* GetCurrentEventContent();
nsIFrame* GetCurrentEventFrame();
nsresult RetargetEventToParent(mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus);
void PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent);
void PopCurrentEventInfo();
nsresult HandleEventInternal(mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus);
nsresult HandlePositionedEvent(nsIFrame* aTargetFrame,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus);
// This returns the focused DOM window under our top level window.
// I.e., when we are deactive, this returns the *last* focused DOM window.
already_AddRefed<nsPIDOMWindow> GetFocusedDOMWindowInOurWindow();
/*
* This and the next two helper methods are used to target and position the
* context menu when the keyboard shortcut is used to open it.
*
* If another menu is open, the context menu is opened relative to the
* active menuitem within the menu, or the menu itself if no item is active.
* Otherwise, if the caret is visible, the menu is opened near the caret.
* Otherwise, if a selectable list such as a listbox is focused, the
* current item within the menu is opened relative to this item.
* Otherwise, the context menu is opened at the topleft corner of the
* view.
*
* Returns true if the context menu event should fire and false if it should
* not.
*/
bool AdjustContextMenuKeyEvent(mozilla::WidgetMouseEvent* aEvent);
//
bool PrepareToUseCaretPosition(nsIWidget* aEventWidget,
mozilla::LayoutDeviceIntPoint& aTargetPt);
// Get the selected item and coordinates in device pixels relative to root
// document's root view for element, first ensuring the element is onscreen
void GetCurrentItemAndPositionForElement(nsIDOMElement *aCurrentEl,
nsIContent **aTargetToUse,
mozilla::LayoutDeviceIntPoint& aTargetPt,
nsIWidget *aRootWidget);
void FireResizeEvent();
static void AsyncResizeEventCallback(nsITimer* aTimer, void* aPresShell);
virtual void SynthesizeMouseMove(bool aFromScroll) override;
PresShell* GetRootPresShell();
nscolor GetDefaultBackgroundColorToDraw();
DOMHighResTimeStamp GetPerformanceNow();
// The callback for the mPaintSuppressionTimer timer.
static void sPaintSuppressionCallback(nsITimer* aTimer, void* aPresShell);
// The callback for the mReflowContinueTimer timer.
static void sReflowContinueCallback(nsITimer* aTimer, void* aPresShell);
bool ScheduleReflowOffTimer();
// Widget notificiations
virtual void WindowSizeMoveDone() override;
virtual void SysColorChanged() override { mPresContext->SysColorChanged(); }
virtual void ThemeChanged() override { mPresContext->ThemeChanged(); }
virtual void BackingScaleFactorChanged() override { mPresContext->UIResolutionChanged(); }
virtual void PausePainting() override;
virtual void ResumePainting() override;
void UpdateImageVisibility();
void UpdateActivePointerState(mozilla::WidgetGUIEvent* aEvent);
nsRevocableEventPtr<nsRunnableMethod<PresShell> > mUpdateImageVisibilityEvent;
void ClearVisibleImagesList(uint32_t aNonvisibleAction);
static void ClearImageVisibilityVisited(nsView* aView, bool aClear);
static void MarkImagesInListVisible(const nsDisplayList& aList);
void MarkImagesInSubtreeVisible(nsIFrame* aFrame, const nsRect& aRect);
// Methods for dispatching KeyboardEvent and BeforeAfterKeyboardEvent.
void HandleKeyboardEvent(nsINode* aTarget,
mozilla::WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled,
nsEventStatus* aStatus,
mozilla::EventDispatchingCallback* aEventCB);
void DispatchBeforeKeyboardEventInternal(
const nsTArray<nsCOMPtr<mozilla::dom::Element> >& aChain,
const mozilla::WidgetKeyboardEvent& aEvent,
size_t& aChainIndex,
bool& aDefaultPrevented);
void DispatchAfterKeyboardEventInternal(
const nsTArray<nsCOMPtr<mozilla::dom::Element> >& aChain,
const mozilla::WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled,
size_t aChainIndex = 0);
bool CanDispatchEvent(const mozilla::WidgetGUIEvent* aEvent = nullptr) const;
// A list of images that are visible or almost visible.
nsTHashtable< nsRefPtrHashKey<nsIImageLoadingContent> > mVisibleImages;
nsresult SetResolutionImpl(float aResolution, bool aScaleToResolution);
#ifdef DEBUG
// The reflow root under which we're currently reflowing. Null when
// not in reflow.
nsIFrame* mCurrentReflowRoot;
uint32_t mUpdateCount;
#endif
#ifdef MOZ_REFLOW_PERF
ReflowCountMgr* mReflowCountMgr;
#endif
// This is used for synthetic mouse events that are sent when what is under
// the mouse pointer may have changed without the mouse moving (eg scrolling,
// change to the document contents).
// It is set only on a presshell for a root document, this value represents
// the last observed location of the mouse relative to that root document. It
// is set to (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if the mouse isn't
// over our window or there is no last observed mouse location for some
// reason.
nsPoint mMouseLocation;
// mStyleSet owns it but we maintain a ref, may be null
nsRefPtr<mozilla::CSSStyleSheet> mPrefStyleSheet;
// Set of frames that we should mark with NS_FRAME_HAS_DIRTY_CHILDREN after
// we finish reflowing mCurrentReflowRoot.
nsTHashtable<nsPtrHashKey<nsIFrame> > mFramesToDirty;
// Reflow roots that need to be reflowed.
nsTArray<nsIFrame*> mDirtyRoots;
nsTArray<nsAutoPtr<DelayedEvent> > mDelayedEvents;
nsRevocableEventPtr<nsRunnableMethod<PresShell> > mResizeEvent;
nsCOMPtr<nsITimer> mAsyncResizeEventTimer;
private:
nsIFrame* mCurrentEventFrame;
nsCOMPtr<nsIContent> mCurrentEventContent;
nsTArray<nsIFrame*> mCurrentEventFrameStack;
nsCOMArray<nsIContent> mCurrentEventContentStack;
protected:
nsRevocableEventPtr<nsSynthMouseMoveEvent> mSynthMouseMoveEvent;
nsCOMPtr<nsIContent> mLastAnchorScrolledTo;
nsRefPtr<nsCaret> mCaret;
nsRefPtr<nsCaret> mOriginalCaret;
nsCallbackEventRequest* mFirstCallbackEventRequest;
nsCallbackEventRequest* mLastCallbackEventRequest;
// TouchManager
TouchManager mTouchManager;
nsRefPtr<ZoomConstraintsClient> mZoomConstraintsClient;
nsRefPtr<MobileViewportManager> mMobileViewportManager;
// TouchCaret
nsRefPtr<mozilla::TouchCaret> mTouchCaret;
nsRefPtr<mozilla::SelectionCarets> mSelectionCarets;
nsRefPtr<mozilla::AccessibleCaretEventHub> mAccessibleCaretEventHub;
// This timer controls painting suppression. Until it fires
// or all frames are constructed, we won't paint anything but
// our <body> background and scrollbars.
nsCOMPtr<nsITimer> mPaintSuppressionTimer;
nsCOMPtr<nsITimer> mDelayedPaintTimer;
// The `performance.now()` value when we last started to process reflows.
DOMHighResTimeStamp mLastReflowStart;
mozilla::TimeStamp mLoadBegin; // used to time loads
// Information needed to properly handle scrolling content into view if the
// pre-scroll reflow flush can be interrupted. mContentToScrollTo is
// non-null between the initial scroll attempt and the first time we finish
// processing all our dirty roots. mContentToScrollTo has a content property
// storing the details for the scroll operation, see ScrollIntoViewData above.
nsCOMPtr<nsIContent> mContentToScrollTo;
nscoord mLastAnchorScrollPositionY;
// Information about live content (which still stay in DOM tree).
// Used in case we need re-dispatch event after sending pointer event,
// when target of pointer event was deleted during executing user handlers.
nsCOMPtr<nsIContent> mPointerEventTarget;
// This is used to protect ourselves from triggering reflow while in the
// middle of frame construction and the like... it really shouldn't be
// needed, one hopes, but it is for now.
uint16_t mChangeNestCount;
bool mDocumentLoading : 1;
bool mIgnoreFrameDestruction : 1;
bool mHaveShutDown : 1;
bool mViewportOverridden : 1;
bool mLastRootReflowHadUnconstrainedBSize : 1;
bool mNoDelayedMouseEvents : 1;
bool mNoDelayedKeyEvents : 1;
// We've been disconnected from the document. We will refuse to paint the
// document until either our timer fires or all frames are constructed.
bool mIsDocumentGone : 1;
// Indicates that it is safe to unlock painting once all pending reflows
// have been processed.
bool mShouldUnsuppressPainting : 1;
bool mAsyncResizeTimerIsActive : 1;
bool mInResize : 1;
bool mImageVisibilityVisited : 1;
bool mNextPaintCompressed : 1;
bool mHasCSSBackgroundColor : 1;
// Whether content should be scaled by the resolution amount. If this is
// not set, a transform that scales by the inverse of the resolution is
// applied to rendered layers.
bool mScaleToResolution : 1;
// Whether the last chrome-only escape key event is consumed.
bool mIsLastChromeOnlyEscapeKeyConsumed : 1;
// Whether the widget has received a paint message yet.
bool mHasReceivedPaintMessage : 1;
static bool sDisableNonTestMouseEvents;
};
#endif /* !defined(nsPresShell_h_) */
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