From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 layout/base/nsPresShell.h | 966 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 966 insertions(+)
 create mode 100644 layout/base/nsPresShell.h

(limited to 'layout/base/nsPresShell.h')

diff --git a/layout/base/nsPresShell.h b/layout/base/nsPresShell.h
new file mode 100644
index 000000000..ad4ede08b
--- /dev/null
+++ b/layout/base/nsPresShell.h
@@ -0,0 +1,966 @@
+/* -*- 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 "nsContentUtils.h" // For AddScriptBlocker().
+#include "nsRefreshDriver.h"
+#include "TouchManager.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/EventForwards.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/StyleSetHandle.h"
+#include "mozilla/UniquePtr.h"
+#include "MobileViewportManager.h"
+#include "ZoomConstraintsClient.h"
+
+class nsIDocShell;
+class nsRange;
+
+struct RangePaintInfo;
+struct nsCallbackEventRequest;
+#ifdef MOZ_REFLOW_PERF
+class ReflowCountMgr;
+#endif
+
+class nsPresShellEventCB;
+class nsAutoCauseReflowNotifier;
+
+namespace mozilla {
+
+class EventDispatchingCallback;
+
+// A set type for tracking visible frames, for use by the visibility code in
+// PresShell. The set contains nsIFrame* pointers.
+typedef nsTHashtable<nsPtrHashKey<nsIFrame>> VisibleFrames;
+
+// A hash table type for tracking visible regions, for use by the visibility
+// code in PresShell. The mapping is from view IDs to regions in the
+// coordinate system of that view's scrolled frame.
+typedef nsClassHashtable<nsUint64HashKey, mozilla::CSSIntRegion> VisibleRegions;
+
+} // 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
+{
+  template <typename T> using Maybe = mozilla::Maybe<T>;
+  using Nothing = mozilla::Nothing;
+  using OnNonvisible = mozilla::OnNonvisible;
+  using RawSelectionType = mozilla::RawSelectionType;
+  using SelectionType = mozilla::SelectionType;
+  using VisibleFrames = mozilla::VisibleFrames;
+  using VisibleRegions = mozilla::VisibleRegions;
+
+public:
+  PresShell();
+
+  NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
+
+  // nsISupports
+  NS_DECL_ISUPPORTS
+
+  static bool AccessibleCaretEnabled(nsIDocShell* aDocShell);
+
+  // BeforeAfterKeyboardEvent preference
+  static bool BeforeAfterKeyboardEventEnabled();
+
+  static bool IsTargetIframe(nsINode* aTarget);
+
+  void Init(nsIDocument* aDocument, nsPresContext* aPresContext,
+            nsViewManager* aViewManager, mozilla::StyleSetHandle aStyleSet);
+  virtual void Destroy() override;
+  virtual void MakeZombie() override;
+
+  virtual void UpdatePreferenceStyles() override;
+
+  NS_IMETHOD GetSelection(RawSelectionType aRawSelectionType,
+                          nsISelection** aSelection) override;
+  virtual mozilla::dom::Selection*
+    GetCurrentSelection(SelectionType aSelectionType) override;
+  virtual already_AddRefed<nsISelectionController>
+            GetSelectionControllerForFocusedContent(
+              nsIContent** aFocusedContent = nullptr) override;
+
+  NS_IMETHOD SetDisplaySelection(int16_t aToggle) override;
+  NS_IMETHOD GetDisplaySelection(int16_t *aToggle) override;
+  NS_IMETHOD ScrollSelectionIntoView(RawSelectionType aRawSelectionType,
+                                     SelectionRegion aRegion,
+                                     int16_t aFlags) override;
+  NS_IMETHOD RepaintSelection(RawSelectionType aRawSelectionType) override;
+
+  virtual void BeginObservingDocument() override;
+  virtual void EndObservingDocument() override;
+  virtual nsresult Initialize(nscoord aWidth, nscoord aHeight) override;
+  virtual nsresult ResizeReflow(nscoord aWidth, nscoord aHeight, nscoord aOldWidth = 0, nscoord aOldHeight = 0) override;
+  virtual nsresult ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight, nscoord aOldWidth, nscoord aOldHeight) override;
+  virtual nsIPageSequenceFrame* GetPageSequenceFrame() const override;
+  virtual nsCanvasFrame* GetCanvasFrame() 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(
+      nsTArray<RefPtr<mozilla::StyleSheet>>& aSheets) override;
+  virtual nsresult SetAgentStyleSheets(
+      const nsTArray<RefPtr<mozilla::StyleSheet>>& aSheets) override;
+
+  virtual nsresult AddOverrideStyleSheet(mozilla::StyleSheet* aSheet) override;
+  virtual nsresult RemoveOverrideStyleSheet(mozilla::StyleSheet* 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,
+             const mozilla::LayoutDeviceIntPoint aPoint,
+             mozilla::LayoutDeviceIntRect* aScreenRect,
+             uint32_t aFlags) override;
+
+  virtual already_AddRefed<SourceSurface>
+  RenderSelection(nsISelection* aSelection,
+                  const mozilla::LayoutDeviceIntPoint aPoint,
+                  mozilla::LayoutDeviceIntRect* aScreenRect,
+                  uint32_t aFlags) override;
+
+  virtual already_AddRefed<nsPIDOMWindowOuter> 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;
+  virtual float GetCumulativeNonRootScaleResolution() override;
+  virtual void SetRestoreResolution(float aResolution,
+                                    mozilla::LayoutDeviceIntSize aDisplaySize) 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;
+
+  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;
+
+  // 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 mozilla::LazyLogModule 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 (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;
+  };
+
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Approximate frame visibility tracking public API.
+  //////////////////////////////////////////////////////////////////////////////
+
+  void ScheduleApproximateFrameVisibilityUpdateSoon() override;
+  void ScheduleApproximateFrameVisibilityUpdateNow() override;
+
+  void RebuildApproximateFrameVisibilityDisplayList(const nsDisplayList& aList) override;
+  void RebuildApproximateFrameVisibility(nsRect* aRect = nullptr,
+                                         bool aRemoveOnly = false) override;
+
+  void EnsureFrameInApproximatelyVisibleList(nsIFrame* aFrame) override;
+  void RemoveFrameFromApproximatelyVisibleList(nsIFrame* aFrame) override;
+
+  bool AssumeAllFramesVisible() override;
+
+
+  virtual void RecordShadowStyleChange(mozilla::dom::ShadowRoot* aShadowRoot) override;
+
+  virtual void DispatchAfterKeyboardEvent(nsINode* aTarget,
+                                          const mozilla::WidgetKeyboardEvent& aEvent,
+                                          bool aEmbeddedCancelled) override;
+
+  virtual bool CanDispatchEvent(
+      const mozilla::WidgetGUIEvent* aEvent = nullptr) const override;
+
+  void SetNextPaintCompressed() { mNextPaintCompressed = true; }
+
+protected:
+  virtual ~PresShell();
+
+  void HandlePostedReflowCallbacks(bool aInterruptible);
+  void CancelPostedReflowCallbacks();
+
+  void ScheduleBeforeFirstPaint();
+  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.
+   */
+  void     DidDoReflow(bool aInterruptible);
+  // 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)
+    { }
+    Maybe<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(mozilla::StyleSheet* 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
+  mozilla::UniquePtr<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(const nsTArray<mozilla::UniquePtr<RangePaintInfo>>& aItems,
+                      nsISelection* aSelection,
+                      nsIntRegion* aRegion,
+                      nsRect aArea,
+                      const mozilla::LayoutDeviceIntPoint aPoint,
+                      mozilla::LayoutDeviceIntRect* 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(mozilla::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, true);
+    }
+    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) {
+        RefPtr<PresShell> shell = mPresShell;
+        shell->ProcessSynthMouseMoveEvent(mFromScroll);
+      }
+    }
+  private:
+    PresShell* mPresShell;
+    bool mFromScroll;
+  };
+  void ProcessSynthMouseMoveEvent(bool aFromScroll);
+
+  void QueryIsActive();
+  nsresult UpdateImageLockingState();
+
+  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();
+  /**
+   * @param aIsHandlingNativeEvent      true when the caller (perhaps) handles
+   *                                    an event which is caused by native
+   *                                    event.  Otherwise, false.
+   */
+  nsresult HandleEventInternal(mozilla::WidgetEvent* aEvent,
+                               nsEventStatus* aStatus,
+                               bool aIsHandlingNativeEvent);
+  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<nsPIDOMWindowOuter> 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(); }
+#ifdef ANDROID
+  virtual nsIDocument* GetTouchEventTargetDocument() override;
+#endif
+
+  virtual void PausePainting() override;
+  virtual void ResumePainting() override;
+
+  void UpdateActivePointerState(mozilla::WidgetGUIEvent* aEvent);
+
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Approximate frame visibility tracking implementation.
+  //////////////////////////////////////////////////////////////////////////////
+
+  void UpdateApproximateFrameVisibility();
+  void DoUpdateApproximateFrameVisibility(bool aRemoveOnly);
+
+  void ClearApproximatelyVisibleFramesList(Maybe<mozilla::OnNonvisible> aNonvisibleAction
+                                             = Nothing());
+  static void ClearApproximateFrameVisibilityVisited(nsView* aView, bool aClear);
+  static void MarkFramesInListApproximatelyVisible(const nsDisplayList& aList,
+                                                   Maybe<VisibleRegions>& aVisibleRegions);
+  void MarkFramesInSubtreeApproximatelyVisible(nsIFrame* aFrame,
+                                               const nsRect& aRect,
+                                               Maybe<VisibleRegions>& aVisibleRegions,
+                                               bool aRemoveOnly = false);
+
+  void DecApproximateVisibleCount(VisibleFrames& aFrames,
+                                  Maybe<OnNonvisible> aNonvisibleAction = Nothing());
+
+  nsRevocableEventPtr<nsRunnableMethod<PresShell>> mUpdateApproximateFrameVisibilityEvent;
+
+  // A set of frames that were visible or could be visible soon at the time
+  // that we last did an approximate frame visibility update.
+  VisibleFrames mApproximatelyVisibleFrames;
+
+
+  //////////////////////////////////////////////////////////////////////////////
+  // 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);
+
+#ifdef MOZ_B2G
+  // This method is used to forward the keyboard event to the input-method-app
+  // before the event is dispatched to its event target.
+  // Return true if it's successfully forwarded. Otherwise, return false.
+  bool ForwardKeyToInputMethodApp(nsINode* aTarget,
+                                  mozilla::WidgetKeyboardEvent& aEvent,
+                                  nsEventStatus* aStatus);
+#endif // MOZ_B2G
+
+  // This method tries forwarding key events to the input-method-editor(IME).
+  // If the event isn't be forwarded, then it will be dispathed to its target.
+  // Return true when event is successfully forwarded to the input-method-editor.
+  // Otherwise, return false.
+  bool ForwardKeyToInputMethodAppOrDispatch(bool aIsTargetRemote,
+                                            nsINode* aTarget,
+                                            mozilla::WidgetKeyboardEvent& aEvent,
+                                            nsEventStatus* aStatus,
+                                            mozilla::EventDispatchingCallback* aEventCB);
+
+  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;
+  // This is an APZ state variable that tracks the target guid for the last
+  // mouse event that was processed (corresponding to mMouseLocation). This is
+  // needed for the synthetic mouse events.
+  mozilla::layers::ScrollableLayerGuid mMouseEventTargetGuid;
+
+  // mStyleSet owns it but we maintain a ref, may be null
+  RefPtr<mozilla::StyleSheet> 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;
+  RefPtr<nsCaret>         mCaret;
+  RefPtr<nsCaret>         mOriginalCaret;
+  nsCallbackEventRequest*   mFirstCallbackEventRequest;
+  nsCallbackEventRequest*   mLastCallbackEventRequest;
+
+  mozilla::TouchManager     mTouchManager;
+
+  RefPtr<ZoomConstraintsClient> mZoomConstraintsClient;
+  RefPtr<MobileViewportManager> mMobileViewportManager;
+
+  RefPtr<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                      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                      mApproximateFrameVisibilityVisited : 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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