gecko-dev/layout/xul/nsListBoxBodyFrame.h

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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 "nsIListBoxObject.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 : public nsBoxFrame,
public nsIScrollbarMediator,
public nsIReflowCallback
{
nsListBoxBodyFrame(nsIPresShell* aPresShell, nsStyleContext* aContext,
nsBoxLayout* aLayoutManager);
virtual ~nsListBoxBodyFrame();
public:
NS_DECL_QUERYFRAME_TARGET(nsListBoxBodyFrame)
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
// non-virtual nsIListBoxObject
nsresult GetRowCount(int32_t *aResult);
nsresult GetNumberOfVisibleRows(int32_t *aResult);
nsresult GetIndexOfFirstVisibleRow(int32_t *aResult);
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,
nsIFrame* aParent,
nsIFrame* aPrevInFlow) MOZ_OVERRIDE;
virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
NS_IMETHOD AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) MOZ_OVERRIDE;
// nsIScrollbarMediator
NS_IMETHOD PositionChanged(nsScrollbarFrame* aScrollbar, int32_t aOldIndex, int32_t& aNewIndex) MOZ_OVERRIDE;
NS_IMETHOD ScrollbarButtonPressed(nsScrollbarFrame* aScrollbar, int32_t aOldIndex, int32_t aNewIndex) MOZ_OVERRIDE;
NS_IMETHOD VisibilityChanged(bool aVisible) MOZ_OVERRIDE;
// nsIReflowCallback
virtual bool ReflowFinished() MOZ_OVERRIDE;
virtual void ReflowCallbackCanceled() MOZ_OVERRIDE;
NS_IMETHOD DoLayout(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
virtual void MarkIntrinsicWidthsDirty() MOZ_OVERRIDE;
virtual nsSize GetMinSizeForScrollArea(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
// size calculation
int32_t GetRowCount();
int32_t GetRowHeightAppUnits() { return mRowHeight; }
int32_t GetFixedRowSize();
void SetRowHeight(nscoord aRowHeight);
nscoord GetYPosition();
nscoord GetAvailableHeight();
nscoord ComputeIntrinsicWidth(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);
// 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(nsPresContext* aPresContext, 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() MOZ_OVERRIDE;
virtual bool ComputesOwnOverflowArea() MOZ_OVERRIDE { return true; }
protected:
class nsPositionChangedEvent;
friend class nsPositionChangedEvent;
class nsPositionChangedEvent : public nsRunnable
{
public:
nsPositionChangedEvent(nsListBoxBodyFrame* aFrame,
bool aUp, int32_t aDelta) :
mFrame(aFrame), mUp(aUp), mDelta(aDelta)
{}
NS_IMETHOD Run() MOZ_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();
void RemoveChildFrame(nsBoxLayoutState &aState, nsIFrame *aChild);
nsTArray< nsRefPtr<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