218 lines
7.3 KiB
C++
218 lines
7.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsListBoxBodyFrame_h
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#define nsListBoxBodyFrame_h
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#include "mozilla/Attributes.h"
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#include "nsCOMPtr.h"
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#include "nsBoxFrame.h"
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#include "nsIScrollbarMediator.h"
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#include "nsIReflowCallback.h"
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#include "nsBoxLayoutState.h"
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#include "nsThreadUtils.h"
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#include "nsPIBoxObject.h"
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class nsPresContext;
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class nsListScrollSmoother;
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nsIFrame* NS_NewListBoxBodyFrame(nsIPresShell* aPresShell,
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nsStyleContext* aContext);
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class nsListBoxBodyFrame final : public nsBoxFrame,
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public nsIScrollbarMediator,
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public nsIReflowCallback
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{
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nsListBoxBodyFrame(nsStyleContext* aContext,
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nsBoxLayout* aLayoutManager);
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virtual ~nsListBoxBodyFrame();
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public:
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NS_DECL_QUERYFRAME_TARGET(nsListBoxBodyFrame)
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS
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// non-virtual ListBoxObject
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int32_t GetNumberOfVisibleRows();
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int32_t GetIndexOfFirstVisibleRow();
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nsresult EnsureIndexIsVisible(int32_t aRowIndex);
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nsresult ScrollToIndex(int32_t aRowIndex);
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nsresult ScrollByLines(int32_t aNumLines);
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nsresult GetItemAtIndex(int32_t aIndex, nsIDOMElement **aResult);
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nsresult GetIndexOfItem(nsIDOMElement *aItem, int32_t *aResult);
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friend nsIFrame* NS_NewListBoxBodyFrame(nsIPresShell* aPresShell,
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nsStyleContext* aContext);
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// nsIFrame
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virtual void Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
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virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) override;
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// nsIScrollbarMediator
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virtual void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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nsIScrollbarMediator::ScrollSnapMode snapMode
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= nsIScrollbarMediator::DISABLE_SNAP) override;
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virtual void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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nsIScrollbarMediator::ScrollSnapMode snapMode
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= nsIScrollbarMediator::DISABLE_SNAP) override;
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virtual void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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nsIScrollbarMediator::ScrollSnapMode snapMode
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= nsIScrollbarMediator::DISABLE_SNAP) override;
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virtual void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) override;
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virtual void ThumbMoved(nsScrollbarFrame* aScrollbar,
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int32_t aOldPos,
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int32_t aNewPos) override;
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virtual void ScrollbarReleased(nsScrollbarFrame* aScrollbar) override {}
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virtual void VisibilityChanged(bool aVisible) override;
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virtual nsIFrame* GetScrollbarBox(bool aVertical) override;
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virtual void ScrollbarActivityStarted() const override {}
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virtual void ScrollbarActivityStopped() const override {}
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virtual bool IsScrollbarOnRight() const override {
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return (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_LTR);
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}
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virtual bool ShouldSuppressScrollbarRepaints() const override {
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return false;
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}
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// nsIReflowCallback
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virtual bool ReflowFinished() override;
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virtual void ReflowCallbackCanceled() override;
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NS_IMETHOD DoXULLayout(nsBoxLayoutState& aBoxLayoutState) override;
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virtual void MarkIntrinsicISizesDirty() override;
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virtual nsSize GetXULMinSizeForScrollArea(nsBoxLayoutState& aBoxLayoutState) override;
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virtual nsSize GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState) override;
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// size calculation
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int32_t GetRowCount();
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int32_t GetRowHeightAppUnits() { return mRowHeight; }
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int32_t GetFixedRowSize();
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void SetRowHeight(nscoord aRowHeight);
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nscoord GetYPosition();
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nscoord GetAvailableHeight();
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nscoord ComputeIntrinsicISize(nsBoxLayoutState& aBoxLayoutState);
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// scrolling
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nsresult InternalPositionChangedCallback();
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nsresult InternalPositionChanged(bool aUp, int32_t aDelta);
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// Process pending position changed events, then do the position change.
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// This can wipe out the frametree.
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nsresult DoInternalPositionChangedSync(bool aUp, int32_t aDelta);
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// Actually do the internal position change. This can wipe out the frametree
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nsresult DoInternalPositionChanged(bool aUp, int32_t aDelta);
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nsListScrollSmoother* GetSmoother();
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void VerticalScroll(int32_t aDelta);
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// Update the scroll index given a position, in CSS pixels
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void UpdateIndex(int32_t aNewPos);
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// frames
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nsIFrame* GetFirstFrame();
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nsIFrame* GetLastFrame();
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// lazy row creation and destruction
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void CreateRows();
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void DestroyRows(int32_t& aRowsToLose);
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void ReverseDestroyRows(int32_t& aRowsToLose);
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nsIFrame* GetFirstItemBox(int32_t aOffset, bool* aCreated);
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nsIFrame* GetNextItemBox(nsIFrame* aBox, int32_t aOffset, bool* aCreated);
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bool ContinueReflow(nscoord height);
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NS_IMETHOD ListBoxAppendFrames(nsFrameList& aFrameList);
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NS_IMETHOD ListBoxInsertFrames(nsIFrame* aPrevFrame, nsFrameList& aFrameList);
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void OnContentInserted(nsIContent* aContent);
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void OnContentRemoved(nsPresContext* aPresContext, nsIContent* aContainer,
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nsIFrame* aChildFrame, nsIContent* aOldNextSibling);
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void GetListItemContentAt(int32_t aIndex, nsIContent** aContent);
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void GetListItemNextSibling(nsIContent* aListItem, nsIContent** aContent, int32_t& aSiblingIndex);
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void PostReflowCallback();
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bool SetBoxObject(nsPIBoxObject* aBoxObject)
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{
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NS_ENSURE_TRUE(!mBoxObject, false);
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mBoxObject = aBoxObject;
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return true;
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}
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virtual bool SupportsOrdinalsInChildren() override;
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virtual bool ComputesOwnOverflowArea() override { return true; }
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protected:
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class nsPositionChangedEvent;
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friend class nsPositionChangedEvent;
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class nsPositionChangedEvent : public mozilla::Runnable
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{
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public:
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nsPositionChangedEvent(nsListBoxBodyFrame* aFrame,
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bool aUp, int32_t aDelta) :
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mFrame(aFrame), mUp(aUp), mDelta(aDelta)
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{}
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NS_IMETHOD Run() override
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{
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if (!mFrame) {
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return NS_OK;
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}
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mFrame->mPendingPositionChangeEvents.RemoveElement(this);
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return mFrame->DoInternalPositionChanged(mUp, mDelta);
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}
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void Revoke() {
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mFrame = nullptr;
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}
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nsListBoxBodyFrame* mFrame;
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bool mUp;
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int32_t mDelta;
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};
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void ComputeTotalRowCount();
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int32_t ToRowIndex(nscoord aPos) const;
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void RemoveChildFrame(nsBoxLayoutState &aState, nsIFrame *aChild);
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nsTArray< RefPtr<nsPositionChangedEvent> > mPendingPositionChangeEvents;
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nsCOMPtr<nsPIBoxObject> mBoxObject;
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// frame markers
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nsWeakFrame mTopFrame;
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nsIFrame* mBottomFrame;
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nsIFrame* mLinkupFrame;
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nsListScrollSmoother* mScrollSmoother;
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int32_t mRowsToPrepend;
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// row height
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int32_t mRowCount;
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nscoord mRowHeight;
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nscoord mAvailableHeight;
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nscoord mStringWidth;
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// scrolling
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int32_t mCurrentIndex; // Row-based
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int32_t mOldIndex;
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int32_t mYPosition;
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int32_t mTimePerRow;
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// row height
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bool mRowHeightWasSet;
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// scrolling
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bool mScrolling;
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bool mAdjustScroll;
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bool mReflowCallbackPosted;
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};
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#endif // nsListBoxBodyFrame_h
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