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Diffstat (limited to 'layout/xul/tree/nsTreeBodyFrame.h')
| -rw-r--r-- | layout/xul/tree/nsTreeBodyFrame.h | 614 |
1 files changed, 614 insertions, 0 deletions
diff --git a/layout/xul/tree/nsTreeBodyFrame.h b/layout/xul/tree/nsTreeBodyFrame.h new file mode 100644 index 0000000000..e2ddacc539 --- /dev/null +++ b/layout/xul/tree/nsTreeBodyFrame.h @@ -0,0 +1,614 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 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/. */ + +#ifndef nsTreeBodyFrame_h +#define nsTreeBodyFrame_h + +#include "mozilla/AtomArray.h" +#include "mozilla/Attributes.h" + +#include "nsLeafBoxFrame.h" +#include "nsITreeView.h" +#include "nsIScrollbarMediator.h" +#include "nsITimer.h" +#include "nsIReflowCallback.h" +#include "nsTArray.h" +#include "nsTreeStyleCache.h" +#include "nsTreeColumns.h" +#include "nsTHashMap.h" +#include "nsTHashSet.h" +#include "imgIRequest.h" +#include "imgINotificationObserver.h" +#include "nsScrollbarFrame.h" +#include "nsThreadUtils.h" +#include "mozilla/LookAndFeel.h" + +class nsFontMetrics; +class nsOverflowChecker; +class nsTreeImageListener; + +namespace mozilla { +class PresShell; +namespace layout { +class ScrollbarActivity; +} // namespace layout +} // namespace mozilla + +// An entry in the tree's image cache +struct nsTreeImageCacheEntry { + nsTreeImageCacheEntry() = default; + nsTreeImageCacheEntry(imgIRequest* aRequest, + imgINotificationObserver* aListener) + : request(aRequest), listener(aListener) {} + + nsCOMPtr<imgIRequest> request; + nsCOMPtr<imgINotificationObserver> listener; +}; + +// The actual frame that paints the cells and rows. +class nsTreeBodyFrame final : public nsLeafBoxFrame, + public nsIScrollbarMediator, + public nsIReflowCallback { + typedef mozilla::layout::ScrollbarActivity ScrollbarActivity; + typedef mozilla::image::ImgDrawResult ImgDrawResult; + + public: + explicit nsTreeBodyFrame(ComputedStyle* aStyle, nsPresContext* aPresContext); + ~nsTreeBodyFrame(); + + NS_DECL_QUERYFRAME + NS_DECL_FRAMEARENA_HELPERS(nsTreeBodyFrame) + + // Callback handler methods for refresh driver based animations. + // Calls to these functions are forwarded from nsTreeImageListener. These + // mirror how nsImageFrame works. + void OnImageIsAnimated(imgIRequest* aRequest); + + // non-virtual signatures like nsITreeBodyFrame + already_AddRefed<nsTreeColumns> Columns() const { + RefPtr<nsTreeColumns> cols = mColumns; + return cols.forget(); + } + already_AddRefed<nsITreeView> GetExistingView() const { + nsCOMPtr<nsITreeView> view = mView; + return view.forget(); + } + already_AddRefed<nsITreeSelection> GetSelection() const; + nsresult GetView(nsITreeView** aView); + nsresult SetView(nsITreeView* aView); + bool GetFocused() const { return mFocused; } + nsresult SetFocused(bool aFocused); + nsresult GetTreeBody(mozilla::dom::Element** aElement); + int32_t RowHeight() const; + int32_t RowWidth(); + int32_t GetHorizontalPosition() const; + mozilla::Maybe<mozilla::CSSIntRegion> GetSelectionRegion(); + int32_t FirstVisibleRow() const { return mTopRowIndex; } + int32_t LastVisibleRow() const { return mTopRowIndex + mPageLength; } + int32_t PageLength() const { return mPageLength; } + nsresult EnsureRowIsVisible(int32_t aRow); + nsresult EnsureCellIsVisible(int32_t aRow, nsTreeColumn* aCol); + void ScrollToRow(int32_t aRow); + void ScrollByLines(int32_t aNumLines); + void ScrollByPages(int32_t aNumPages); + nsresult Invalidate(); + nsresult InvalidateColumn(nsTreeColumn* aCol); + nsresult InvalidateRow(int32_t aRow); + nsresult InvalidateCell(int32_t aRow, nsTreeColumn* aCol); + nsresult InvalidateRange(int32_t aStart, int32_t aEnd); + int32_t GetRowAt(int32_t aX, int32_t aY); + nsresult GetCellAt(int32_t aX, int32_t aY, int32_t* aRow, nsTreeColumn** aCol, + nsACString& aChildElt); + nsresult GetCoordsForCellItem(int32_t aRow, nsTreeColumn* aCol, + const nsACString& aElt, int32_t* aX, + int32_t* aY, int32_t* aWidth, int32_t* aHeight); + nsresult IsCellCropped(int32_t aRow, nsTreeColumn* aCol, bool* aResult); + nsresult RowCountChanged(int32_t aIndex, int32_t aCount); + nsresult BeginUpdateBatch(); + nsresult EndUpdateBatch(); + nsresult ClearStyleAndImageCaches(); + void RemoveImageCacheEntry(int32_t aRowIndex, nsTreeColumn* aCol); + + void CancelImageRequests(); + + void ManageReflowCallback(const nsRect& aRect, nscoord aHorzWidth); + + virtual nsSize GetXULMinSize(nsBoxLayoutState& aBoxLayoutState) override; + virtual void SetXULBounds(nsBoxLayoutState& aBoxLayoutState, + const nsRect& aRect, + bool aRemoveOverflowArea = false) override; + + // nsIReflowCallback + virtual bool ReflowFinished() override; + virtual void ReflowCallbackCanceled() override; + + // nsIScrollbarMediator + virtual void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection, + mozilla::ScrollSnapFlags aSnapFlags = + mozilla::ScrollSnapFlags::Disabled) override; + virtual void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection, + mozilla::ScrollSnapFlags aSnapFlags = + mozilla::ScrollSnapFlags::Disabled) override; + virtual void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection, + mozilla::ScrollSnapFlags aSnapFlags = + mozilla::ScrollSnapFlags::Disabled) override; + virtual void ScrollByUnit(nsScrollbarFrame* aScrollbar, + mozilla::ScrollMode aMode, int32_t aDirection, + mozilla::ScrollUnit aUnit, + mozilla::ScrollSnapFlags aSnapFlags = + mozilla::ScrollSnapFlags::Disabled) override; + virtual void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) override; + virtual void ThumbMoved(nsScrollbarFrame* aScrollbar, nscoord aOldPos, + nscoord aNewPos) override; + virtual void ScrollbarReleased(nsScrollbarFrame* aScrollbar) override {} + virtual void VisibilityChanged(bool aVisible) override { Invalidate(); } + virtual nsIFrame* GetScrollbarBox(bool aVertical) override { + ScrollParts parts = GetScrollParts(); + return aVertical ? parts.mVScrollbar : parts.mHScrollbar; + } + virtual void ScrollbarActivityStarted() const override; + virtual void ScrollbarActivityStopped() const override; + virtual bool IsScrollbarOnRight() const override { + return StyleVisibility()->mDirection == mozilla::StyleDirection::Ltr; + } + virtual bool ShouldSuppressScrollbarRepaints() const override { + return false; + } + + // Overridden from nsIFrame to cache our pres context. + virtual void Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) override; + virtual void DestroyFrom(nsIFrame* aDestructRoot, + PostDestroyData& aPostDestroyData) override; + + mozilla::Maybe<Cursor> GetCursor(const nsPoint&) override; + + virtual nsresult HandleEvent(nsPresContext* aPresContext, + mozilla::WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) override; + + virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder, + const nsDisplayListSet& aLists) override; + + virtual void DidSetComputedStyle(ComputedStyle* aOldComputedStyle) override; + + friend nsIFrame* NS_NewTreeBodyFrame(mozilla::PresShell* aPresShell); + friend class nsTreeColumn; + + struct ScrollParts { + nsScrollbarFrame* mVScrollbar; + RefPtr<mozilla::dom::Element> mVScrollbarContent; + nsScrollbarFrame* mHScrollbar; + RefPtr<mozilla::dom::Element> mHScrollbarContent; + nsIFrame* mColumnsFrame; + nsIScrollableFrame* mColumnsScrollFrame; + }; + + ImgDrawResult PaintTreeBody(gfxContext& aRenderingContext, + const nsRect& aDirtyRect, nsPoint aPt, + nsDisplayListBuilder* aBuilder); + + // Get the base element, <tree> + mozilla::dom::XULTreeElement* GetBaseElement(); + + bool GetVerticalOverflow() const { return mVerticalOverflow; } + bool GetHorizontalOverflow() const { return mHorizontalOverflow; } + + // This returns the property array where atoms are stored for style during + // draw, whether the row currently being drawn is selected, hovered, etc. + const mozilla::AtomArray& GetPropertyArrayForCurrentDrawingItem() { + return mScratchArray; + } + + protected: + friend class nsOverflowChecker; + + // This method paints a specific column background of the tree. + ImgDrawResult PaintColumn(nsTreeColumn* aColumn, const nsRect& aColumnRect, + nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect); + + // This method paints a single row in the tree. + ImgDrawResult PaintRow(int32_t aRowIndex, const nsRect& aRowRect, + nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect, nsPoint aPt, + nsDisplayListBuilder* aBuilder); + + // This method paints a single separator in the tree. + ImgDrawResult PaintSeparator(int32_t aRowIndex, const nsRect& aSeparatorRect, + nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect); + + // This method paints a specific cell in a given row of the tree. + ImgDrawResult PaintCell(int32_t aRowIndex, nsTreeColumn* aColumn, + const nsRect& aCellRect, nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect, nscoord& aCurrX, + nsPoint aPt, nsDisplayListBuilder* aBuilder); + + // This method paints the twisty inside a cell in the primary column of an + // tree. + ImgDrawResult PaintTwisty(int32_t aRowIndex, nsTreeColumn* aColumn, + const nsRect& aTwistyRect, + nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect, nscoord& aRemainingWidth, + nscoord& aCurrX); + + // This method paints the image inside the cell of an tree. + ImgDrawResult PaintImage(int32_t aRowIndex, nsTreeColumn* aColumn, + const nsRect& aImageRect, + nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect, nscoord& aRemainingWidth, + nscoord& aCurrX, nsDisplayListBuilder* aBuilder); + + // This method paints the text string inside a particular cell of the tree. + ImgDrawResult PaintText(int32_t aRowIndex, nsTreeColumn* aColumn, + const nsRect& aTextRect, nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect, nscoord& aCurrX); + + // This method paints the checkbox inside a particular cell of the tree. + ImgDrawResult PaintCheckbox(int32_t aRowIndex, nsTreeColumn* aColumn, + const nsRect& aCheckboxRect, + nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect); + + // This method paints a drop feedback of the tree. + ImgDrawResult PaintDropFeedback(const nsRect& aDropFeedbackRect, + nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aDirtyRect, nsPoint aPt); + + // This method is called with a specific ComputedStyle and rect to + // paint the background rect as if it were a full-blown frame. + ImgDrawResult PaintBackgroundLayer(ComputedStyle* aComputedStyle, + nsPresContext* aPresContext, + gfxContext& aRenderingContext, + const nsRect& aRect, + const nsRect& aDirtyRect); + + // An internal hit test. aX and aY are expected to be in twips in the + // coordinate system of this frame. + int32_t GetRowAtInternal(nscoord aX, nscoord aY); + + // Check for bidi characters in the text, and if there are any, ensure + // that the prescontext is in bidi mode. + void CheckTextForBidi(nsAutoString& aText); + + void AdjustForCellText(nsAutoString& aText, int32_t aRowIndex, + nsTreeColumn* aColumn, gfxContext& aRenderingContext, + nsFontMetrics& aFontMetrics, nsRect& aTextRect); + + // A helper used when hit testing. + nsCSSAnonBoxPseudoStaticAtom* GetItemWithinCellAt(nscoord aX, + const nsRect& aCellRect, + int32_t aRowIndex, + nsTreeColumn* aColumn); + + // An internal hit test. aX and aY are expected to be in twips in the + // coordinate system of this frame. + void GetCellAt(nscoord aX, nscoord aY, int32_t* aRow, nsTreeColumn** aCol, + nsCSSAnonBoxPseudoStaticAtom** aChildElt); + + // Retrieve the area for the twisty for a cell. + nsITheme* GetTwistyRect(int32_t aRowIndex, nsTreeColumn* aColumn, + nsRect& aImageRect, nsRect& aTwistyRect, + nsPresContext* aPresContext, + ComputedStyle* aTwistyContext); + + // Fetch an image from the image cache. + nsresult GetImage(int32_t aRowIndex, nsTreeColumn* aCol, bool aUseContext, + ComputedStyle* aComputedStyle, bool& aAllowImageRegions, + imgIContainer** aResult); + + // Returns the size of a given image. This size *includes* border and + // padding. It does not include margins. + nsRect GetImageSize(int32_t aRowIndex, nsTreeColumn* aCol, bool aUseContext, + ComputedStyle* aComputedStyle); + + // Returns the destination size of the image, not including borders and + // padding. + nsSize GetImageDestSize(ComputedStyle* aComputedStyle, bool useImageRegion, + imgIContainer* image); + + // Returns the source rectangle of the image to be displayed. + nsRect GetImageSourceRect(ComputedStyle* aComputedStyle, bool useImageRegion, + imgIContainer* image); + + // Returns the height of rows in the tree. + int32_t GetRowHeight(); + + // Returns our indentation width. + int32_t GetIndentation(); + + // Calculates our width/height once border and padding have been removed. + void CalcInnerBox(); + + // Calculate the total width of our scrollable portion + nscoord CalcHorzWidth(const ScrollParts& aParts); + + // Looks up a ComputedStyle in the style cache. On a cache miss we resolve + // the pseudo-styles passed in and place them into the cache. + ComputedStyle* GetPseudoComputedStyle( + nsCSSAnonBoxPseudoStaticAtom* aPseudoElement); + + // Retrieves the scrollbars and scrollview relevant to this treebody. We + // traverse the frame tree under our base element, in frame order, looking + // for the first relevant vertical scrollbar, horizontal scrollbar, and + // scrollable frame (with associated content and scrollable view). These + // are all volatile and should not be retained. + ScrollParts GetScrollParts(); + + // Update the curpos of the scrollbar. + void UpdateScrollbars(const ScrollParts& aParts); + + // Update the maxpos of the scrollbar. + void InvalidateScrollbars(const ScrollParts& aParts, + AutoWeakFrame& aWeakColumnsFrame); + + // Check overflow and generate events. + MOZ_CAN_RUN_SCRIPT_BOUNDARY void CheckOverflow(const ScrollParts& aParts); + + // Calls UpdateScrollbars, Invalidate aNeedsFullInvalidation if true, + // InvalidateScrollbars and finally CheckOverflow. + // returns true if the frame is still alive after the method call. + bool FullScrollbarsUpdate(bool aNeedsFullInvalidation); + + // Use to auto-fill some of the common properties without the view having to + // do it. Examples include container, open, selected, and focus. + void PrefillPropertyArray(int32_t aRowIndex, nsTreeColumn* aCol); + + // Our internal scroll method, used by all the public scroll methods. + nsresult ScrollInternal(const ScrollParts& aParts, int32_t aRow); + nsresult ScrollToRowInternal(const ScrollParts& aParts, int32_t aRow); + nsresult ScrollHorzInternal(const ScrollParts& aParts, int32_t aPosition); + nsresult EnsureRowIsVisibleInternal(const ScrollParts& aParts, int32_t aRow); + + // Convert client pixels into appunits in our coordinate space. + nsPoint AdjustClientCoordsToBoxCoordSpace(int32_t aX, int32_t aY); + + void EnsureView(); + + nsresult GetCellWidth(int32_t aRow, nsTreeColumn* aCol, + gfxContext* aRenderingContext, nscoord& aDesiredSize, + nscoord& aCurrentSize); + nscoord CalcMaxRowWidth(); + + // Translate the given rect horizontally from tree coordinates into the + // coordinate system of our nsTreeBodyFrame. If clip is true, then clip the + // rect to its intersection with mInnerBox in the horizontal direction. + // Return whether the result has a nonempty intersection with mInnerBox + // after projecting both onto the horizontal coordinate axis. + bool OffsetForHorzScroll(nsRect& rect, bool clip); + + bool CanAutoScroll(int32_t aRowIndex); + + // Calc the row and above/below/on status given where the mouse currently is + // hovering. Also calc if we're in the region in which we want to auto-scroll + // the tree. A positive value of |aScrollLines| means scroll down, a negative + // value means scroll up, a zero value means that we aren't in drag scroll + // region. + void ComputeDropPosition(mozilla::WidgetGUIEvent* aEvent, int32_t* aRow, + int16_t* aOrient, int16_t* aScrollLines); + + void InvalidateDropFeedback(int32_t aRow, int16_t aOrientation) { + InvalidateRow(aRow); + if (aOrientation != nsITreeView::DROP_ON) + InvalidateRow(aRow + aOrientation); + } + + public: + /** + * Remove an nsITreeImageListener from being tracked by this frame. Only tree + * image listeners that are created by this frame are tracked. + * + * @param aListener A pointer to an nsTreeImageListener to no longer + * track. + */ + void RemoveTreeImageListener(nsTreeImageListener* aListener); + + protected: + // Create a new timer. This method is used to delay various actions like + // opening/closing folders or tree scrolling. + // aID is type of the action, aFunc is the function to be called when + // the timer fires and aType is type of timer - one shot or repeating. + nsresult CreateTimer(const mozilla::LookAndFeel::IntID aID, + nsTimerCallbackFunc aFunc, int32_t aType, + nsITimer** aTimer, const char* aName); + + static void OpenCallback(nsITimer* aTimer, void* aClosure); + + static void CloseCallback(nsITimer* aTimer, void* aClosure); + + static void LazyScrollCallback(nsITimer* aTimer, void* aClosure); + + static void ScrollCallback(nsITimer* aTimer, void* aClosure); + + class ScrollEvent : public mozilla::Runnable { + public: + NS_DECL_NSIRUNNABLE + explicit ScrollEvent(nsTreeBodyFrame* aInner) + : mozilla::Runnable("nsTreeBodyFrame::ScrollEvent"), mInner(aInner) {} + void Revoke() { mInner = nullptr; } + + private: + nsTreeBodyFrame* mInner; + }; + + void PostScrollEvent(); + MOZ_CAN_RUN_SCRIPT void FireScrollEvent(); + + /** + * Clear the pointer to this frame for all nsTreeImageListeners that were + * created by this frame. + */ + void DetachImageListeners(); + +#ifdef ACCESSIBILITY + /** + * Fires 'treeRowCountChanged' event asynchronously. The event is a + * CustomEvent that is used to expose the following information structures + * via a property bag. + * + * @param aIndex the row index rows are added/removed from + * @param aCount the number of added/removed rows (the sign points to + * an operation, plus - addition, minus - removing) + */ + void FireRowCountChangedEvent(int32_t aIndex, int32_t aCount); + + /** + * Fires 'treeInvalidated' event asynchronously. The event is a CustomEvent + * that is used to expose the information structures described by method + * arguments via a property bag. + * + * @param aStartRow the start index of invalidated rows, -1 means that + * columns have been invalidated only + * @param aEndRow the end index of invalidated rows, -1 means that columns + * have been invalidated only + * @param aStartCol the start invalidated column, nullptr means that only + * rows have been invalidated + * @param aEndCol the end invalidated column, nullptr means that rows have + * been invalidated only + */ + void FireInvalidateEvent(int32_t aStartRow, int32_t aEndRow, + nsTreeColumn* aStartCol, nsTreeColumn* aEndCol); +#endif + + protected: // Data Members + class Slots { + public: + Slots() = default; + + ~Slots() { + if (mTimer) { + mTimer->Cancel(); + } + } + + friend class nsTreeBodyFrame; + + protected: + // If the drop is actually allowed here or not. + bool mDropAllowed = false; + + // True while dragging over the tree. + bool mIsDragging = false; + + // The row the mouse is hovering over during a drop. + int32_t mDropRow = -1; + + // Where we want to draw feedback (above/on this row/below) if allowed. + int16_t mDropOrient = -1; + + // Number of lines to be scrolled. + int16_t mScrollLines = 0; + + // The drag action that was received for this slot + uint32_t mDragAction = 0; + + // Timer for opening/closing spring loaded folders or scrolling the tree. + nsCOMPtr<nsITimer> mTimer; + + // An array used to keep track of all spring loaded folders. + nsTArray<int32_t> mArray; + }; + + mozilla::UniquePtr<Slots> mSlots; + + nsRevocableEventPtr<ScrollEvent> mScrollEvent; + + RefPtr<ScrollbarActivity> mScrollbarActivity; + + // The <tree> element containing this treebody. + RefPtr<mozilla::dom::XULTreeElement> mTree; + + // Cached column information. + RefPtr<nsTreeColumns> mColumns; + + // The current view for this tree widget. We get all of our row and cell data + // from the view. + nsCOMPtr<nsITreeView> mView; + + // A cache of all the ComputedStyles we have seen for rows and cells of the + // tree. This is a mapping from a list of atoms to a corresponding + // ComputedStyle. This cache stores every combination that occurs in the + // tree, so for n distinct properties, this cache could have 2 to the n + // entries (the power set of all row properties). + nsTreeStyleCache mStyleCache; + + // A hashtable that maps from URLs to image request/listener pairs. The URL + // is provided by the view or by the ComputedStyle. The ComputedStyle + // represents a resolved :-moz-tree-cell-image (or twisty) pseudo-element. + // It maps directly to an imgIRequest. + nsTHashMap<nsStringHashKey, nsTreeImageCacheEntry> mImageCache; + + // A scratch array used when looking up cached ComputedStyles. + mozilla::AtomArray mScratchArray; + + // The index of the first visible row and the # of rows visible onscreen. + // The tree only examines onscreen rows, starting from + // this index and going up to index+pageLength. + int32_t mTopRowIndex; + int32_t mPageLength; + + // The horizontal scroll position + nscoord mHorzPosition; + + // The original desired horizontal width before changing it and posting a + // reflow callback. In some cases, the desired horizontal width can first be + // different from the current desired horizontal width, only to return to + // the same value later during the same reflow. In this case, we can cancel + // the posted reflow callback and prevent an unnecessary reflow. + nscoord mOriginalHorzWidth; + // Our desired horizontal width (the width for which we actually have tree + // columns). + nscoord mHorzWidth; + // The amount by which to adjust the width of the last cell. + // This depends on whether or not the columnpicker and scrollbars are present. + nscoord mAdjustWidth; + + // Cached heights and indent info. + nsRect mInnerBox; // 4-byte aligned + int32_t mRowHeight; + int32_t mIndentation; + nscoord mStringWidth; + + int32_t mUpdateBatchNest; + + // Cached row count. + int32_t mRowCount; + + // The row the mouse is hovering over. + int32_t mMouseOverRow; + + // Whether or not we're currently focused. + bool mFocused; + + // Do we have a fixed number of onscreen rows? + bool mHasFixedRowCount; + + bool mVerticalOverflow; + bool mHorizontalOverflow; + + bool mReflowCallbackPosted; + + // Set while we flush layout to take account of effects of + // overflow/underflow event handlers + bool mCheckingOverflow; + + // Hash set to keep track of which listeners we created and thus + // have pointers to us. + nsTHashSet<nsTreeImageListener*> mCreatedListeners; + +}; // class nsTreeBodyFrame + +#endif |