/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* 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 nsListBoxBodyFrame_h #define nsListBoxBodyFrame_h #include "mozilla/Attributes.h" #include "nsCOMPtr.h" #include "nsBoxFrame.h" #include "nsIScrollbarMediator.h" #include "nsIReflowCallback.h" #include "nsBoxLayoutState.h" #include "nsThreadUtils.h" #include "nsPIBoxObject.h" class nsPresContext; class nsListScrollSmoother; nsIFrame* NS_NewListBoxBodyFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); class nsListBoxBodyFrame final : public nsBoxFrame, public nsIScrollbarMediator, public nsIReflowCallback { nsListBoxBodyFrame(nsStyleContext* aContext, nsBoxLayout* aLayoutManager); virtual ~nsListBoxBodyFrame(); public: NS_DECL_QUERYFRAME_TARGET(nsListBoxBodyFrame) NS_DECL_QUERYFRAME NS_DECL_FRAMEARENA_HELPERS // non-virtual ListBoxObject int32_t GetNumberOfVisibleRows(); int32_t GetIndexOfFirstVisibleRow(); nsresult EnsureIndexIsVisible(int32_t aRowIndex); nsresult ScrollToIndex(int32_t aRowIndex); nsresult ScrollByLines(int32_t aNumLines); nsresult GetItemAtIndex(int32_t aIndex, nsIDOMElement **aResult); nsresult GetIndexOfItem(nsIDOMElement *aItem, int32_t *aResult); friend nsIFrame* NS_NewListBoxBodyFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); // nsIFrame virtual void Init(nsIContent* aContent, nsContainerFrame* aParent, nsIFrame* aPrevInFlow) override; virtual void DestroyFrom(nsIFrame* aDestructRoot) override; virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) override; // nsIScrollbarMediator virtual void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection, nsIScrollbarMediator::ScrollSnapMode snapMode = nsIScrollbarMediator::DISABLE_SNAP) override; virtual void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection, nsIScrollbarMediator::ScrollSnapMode snapMode = nsIScrollbarMediator::DISABLE_SNAP) override; virtual void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection, nsIScrollbarMediator::ScrollSnapMode snapMode = nsIScrollbarMediator::DISABLE_SNAP) override; virtual void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) override; virtual void ThumbMoved(nsScrollbarFrame* aScrollbar, int32_t aOldPos, int32_t aNewPos) override; virtual void ScrollbarReleased(nsScrollbarFrame* aScrollbar) override {} virtual void VisibilityChanged(bool aVisible) override; virtual nsIFrame* GetScrollbarBox(bool aVertical) override; virtual void ScrollbarActivityStarted() const override {} virtual void ScrollbarActivityStopped() const override {} virtual bool IsScrollbarOnRight() const override { return (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_LTR); } virtual bool ShouldSuppressScrollbarRepaints() const override { return false; } // nsIReflowCallback virtual bool ReflowFinished() override; virtual void ReflowCallbackCanceled() override; NS_IMETHOD DoXULLayout(nsBoxLayoutState& aBoxLayoutState) override; virtual void MarkIntrinsicISizesDirty() override; virtual nsSize GetXULMinSizeForScrollArea(nsBoxLayoutState& aBoxLayoutState) override; virtual nsSize GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState) override; // size calculation int32_t GetRowCount(); int32_t GetRowHeightAppUnits() { return mRowHeight; } int32_t GetFixedRowSize(); void SetRowHeight(nscoord aRowHeight); nscoord GetYPosition(); nscoord GetAvailableHeight(); nscoord ComputeIntrinsicISize(nsBoxLayoutState& aBoxLayoutState); // scrolling nsresult InternalPositionChangedCallback(); nsresult InternalPositionChanged(bool aUp, int32_t aDelta); // Process pending position changed events, then do the position change. // This can wipe out the frametree. nsresult DoInternalPositionChangedSync(bool aUp, int32_t aDelta); // Actually do the internal position change. This can wipe out the frametree nsresult DoInternalPositionChanged(bool aUp, int32_t aDelta); nsListScrollSmoother* GetSmoother(); void VerticalScroll(int32_t aDelta); // Update the scroll index given a position, in CSS pixels void UpdateIndex(int32_t aNewPos); // frames nsIFrame* GetFirstFrame(); nsIFrame* GetLastFrame(); // lazy row creation and destruction void CreateRows(); void DestroyRows(int32_t& aRowsToLose); void ReverseDestroyRows(int32_t& aRowsToLose); nsIFrame* GetFirstItemBox(int32_t aOffset, bool* aCreated); nsIFrame* GetNextItemBox(nsIFrame* aBox, int32_t aOffset, bool* aCreated); bool ContinueReflow(nscoord height); NS_IMETHOD ListBoxAppendFrames(nsFrameList& aFrameList); NS_IMETHOD ListBoxInsertFrames(nsIFrame* aPrevFrame, nsFrameList& aFrameList); void OnContentInserted(nsIContent* aContent); void OnContentRemoved(nsPresContext* aPresContext, nsIContent* aContainer, nsIFrame* aChildFrame, nsIContent* aOldNextSibling); void GetListItemContentAt(int32_t aIndex, nsIContent** aContent); void GetListItemNextSibling(nsIContent* aListItem, nsIContent** aContent, int32_t& aSiblingIndex); void PostReflowCallback(); bool SetBoxObject(nsPIBoxObject* aBoxObject) { NS_ENSURE_TRUE(!mBoxObject, false); mBoxObject = aBoxObject; return true; } virtual bool SupportsOrdinalsInChildren() override; virtual bool ComputesOwnOverflowArea() override { return true; } protected: class nsPositionChangedEvent; friend class nsPositionChangedEvent; class nsPositionChangedEvent : public mozilla::Runnable { public: nsPositionChangedEvent(nsListBoxBodyFrame* aFrame, bool aUp, int32_t aDelta) : mFrame(aFrame), mUp(aUp), mDelta(aDelta) {} NS_IMETHOD Run() override { if (!mFrame) { return NS_OK; } mFrame->mPendingPositionChangeEvents.RemoveElement(this); return mFrame->DoInternalPositionChanged(mUp, mDelta); } void Revoke() { mFrame = nullptr; } nsListBoxBodyFrame* mFrame; bool mUp; int32_t mDelta; }; void ComputeTotalRowCount(); int32_t ToRowIndex(nscoord aPos) const; void RemoveChildFrame(nsBoxLayoutState &aState, nsIFrame *aChild); nsTArray< RefPtr<nsPositionChangedEvent> > mPendingPositionChangeEvents; nsCOMPtr<nsPIBoxObject> mBoxObject; // frame markers nsWeakFrame mTopFrame; nsIFrame* mBottomFrame; nsIFrame* mLinkupFrame; nsListScrollSmoother* mScrollSmoother; int32_t mRowsToPrepend; // row height int32_t mRowCount; nscoord mRowHeight; nscoord mAvailableHeight; nscoord mStringWidth; // scrolling int32_t mCurrentIndex; // Row-based int32_t mOldIndex; int32_t mYPosition; int32_t mTimePerRow; // row height bool mRowHeightWasSet; // scrolling bool mScrolling; bool mAdjustScroll; bool mReflowCallbackPosted; }; #endif // nsListBoxBodyFrame_h