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/* -*- 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
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