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layout/xul/nsListBoxBodyFrame.h@925c144e1f1f (annotated)

layout/xul/nsListBoxBodyFrame.h

Fri, 16 Jan 2015 18:13:44 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Fri, 16 Jan 2015 18:13:44 +0100
branch
TOR_BUG_9701
changeset 14
925c144e1f1f
permissions
-rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

michael@0 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0 2 /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0 3 * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0 5
michael@0 6 #ifndef nsListBoxBodyFrame_h
michael@0 7 #define nsListBoxBodyFrame_h
michael@0 8
michael@0 9 #include "mozilla/Attributes.h"
michael@0 10 #include "nsCOMPtr.h"
michael@0 11 #include "nsBoxFrame.h"
michael@0 12 #include "nsIListBoxObject.h"
michael@0 13 #include "nsIScrollbarMediator.h"
michael@0 14 #include "nsIReflowCallback.h"
michael@0 15 #include "nsBoxLayoutState.h"
michael@0 16 #include "nsThreadUtils.h"
michael@0 17 #include "nsPIBoxObject.h"
michael@0 18
michael@0 19 class nsPresContext;
michael@0 20 class nsListScrollSmoother;
michael@0 21 nsIFrame* NS_NewListBoxBodyFrame(nsIPresShell* aPresShell,
michael@0 22 nsStyleContext* aContext);
michael@0 23
michael@0 24 class nsListBoxBodyFrame : public nsBoxFrame,
michael@0 25 public nsIScrollbarMediator,
michael@0 26 public nsIReflowCallback
michael@0 27 {
michael@0 28 nsListBoxBodyFrame(nsIPresShell* aPresShell, nsStyleContext* aContext,
michael@0 29 nsBoxLayout* aLayoutManager);
michael@0 30 virtual ~nsListBoxBodyFrame();
michael@0 31
michael@0 32 public:
michael@0 33 NS_DECL_QUERYFRAME_TARGET(nsListBoxBodyFrame)
michael@0 34 NS_DECL_QUERYFRAME
michael@0 35 NS_DECL_FRAMEARENA_HELPERS
michael@0 36
michael@0 37 // non-virtual nsIListBoxObject
michael@0 38 nsresult GetRowCount(int32_t *aResult);
michael@0 39 nsresult GetNumberOfVisibleRows(int32_t *aResult);
michael@0 40 nsresult GetIndexOfFirstVisibleRow(int32_t *aResult);
michael@0 41 nsresult EnsureIndexIsVisible(int32_t aRowIndex);
michael@0 42 nsresult ScrollToIndex(int32_t aRowIndex);
michael@0 43 nsresult ScrollByLines(int32_t aNumLines);
michael@0 44 nsresult GetItemAtIndex(int32_t aIndex, nsIDOMElement **aResult);
michael@0 45 nsresult GetIndexOfItem(nsIDOMElement *aItem, int32_t *aResult);
michael@0 46
michael@0 47 friend nsIFrame* NS_NewListBoxBodyFrame(nsIPresShell* aPresShell,
michael@0 48 nsStyleContext* aContext);
michael@0 49
michael@0 50 // nsIFrame
michael@0 51 virtual void Init(nsIContent* aContent,
michael@0 52 nsIFrame* aParent,
michael@0 53 nsIFrame* aPrevInFlow) MOZ_OVERRIDE;
michael@0 54 virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
michael@0 55
michael@0 56 virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) MOZ_OVERRIDE;
michael@0 57
michael@0 58 // nsIScrollbarMediator
michael@0 59 NS_IMETHOD PositionChanged(nsScrollbarFrame* aScrollbar, int32_t aOldIndex, int32_t& aNewIndex) MOZ_OVERRIDE;
michael@0 60 NS_IMETHOD ScrollbarButtonPressed(nsScrollbarFrame* aScrollbar, int32_t aOldIndex, int32_t aNewIndex) MOZ_OVERRIDE;
michael@0 61 NS_IMETHOD VisibilityChanged(bool aVisible) MOZ_OVERRIDE;
michael@0 62
michael@0 63 // nsIReflowCallback
michael@0 64 virtual bool ReflowFinished() MOZ_OVERRIDE;
michael@0 65 virtual void ReflowCallbackCanceled() MOZ_OVERRIDE;
michael@0 66
michael@0 67 NS_IMETHOD DoLayout(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
michael@0 68 virtual void MarkIntrinsicWidthsDirty() MOZ_OVERRIDE;
michael@0 69
michael@0 70 virtual nsSize GetMinSizeForScrollArea(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
michael@0 71 virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
michael@0 72
michael@0 73 // size calculation
michael@0 74 int32_t GetRowCount();
michael@0 75 int32_t GetRowHeightAppUnits() { return mRowHeight; }
michael@0 76 int32_t GetFixedRowSize();
michael@0 77 void SetRowHeight(nscoord aRowHeight);
michael@0 78 nscoord GetYPosition();
michael@0 79 nscoord GetAvailableHeight();
michael@0 80 nscoord ComputeIntrinsicWidth(nsBoxLayoutState& aBoxLayoutState);
michael@0 81
michael@0 82 // scrolling
michael@0 83 nsresult InternalPositionChangedCallback();
michael@0 84 nsresult InternalPositionChanged(bool aUp, int32_t aDelta);
michael@0 85 // Process pending position changed events, then do the position change.
michael@0 86 // This can wipe out the frametree.
michael@0 87 nsresult DoInternalPositionChangedSync(bool aUp, int32_t aDelta);
michael@0 88 // Actually do the internal position change. This can wipe out the frametree
michael@0 89 nsresult DoInternalPositionChanged(bool aUp, int32_t aDelta);
michael@0 90 nsListScrollSmoother* GetSmoother();
michael@0 91 void VerticalScroll(int32_t aDelta);
michael@0 92
michael@0 93 // frames
michael@0 94 nsIFrame* GetFirstFrame();
michael@0 95 nsIFrame* GetLastFrame();
michael@0 96
michael@0 97 // lazy row creation and destruction
michael@0 98 void CreateRows();
michael@0 99 void DestroyRows(int32_t& aRowsToLose);
michael@0 100 void ReverseDestroyRows(int32_t& aRowsToLose);
michael@0 101 nsIFrame* GetFirstItemBox(int32_t aOffset, bool* aCreated);
michael@0 102 nsIFrame* GetNextItemBox(nsIFrame* aBox, int32_t aOffset, bool* aCreated);
michael@0 103 bool ContinueReflow(nscoord height);
michael@0 104 NS_IMETHOD ListBoxAppendFrames(nsFrameList& aFrameList);
michael@0 105 NS_IMETHOD ListBoxInsertFrames(nsIFrame* aPrevFrame, nsFrameList& aFrameList);
michael@0 106 void OnContentInserted(nsPresContext* aPresContext, nsIContent* aContent);
michael@0 107 void OnContentRemoved(nsPresContext* aPresContext, nsIContent* aContainer,
michael@0 108 nsIFrame* aChildFrame, nsIContent* aOldNextSibling);
michael@0 109
michael@0 110 void GetListItemContentAt(int32_t aIndex, nsIContent** aContent);
michael@0 111 void GetListItemNextSibling(nsIContent* aListItem, nsIContent** aContent, int32_t& aSiblingIndex);
michael@0 112
michael@0 113 void PostReflowCallback();
michael@0 114
michael@0 115 bool SetBoxObject(nsPIBoxObject* aBoxObject)
michael@0 116 {
michael@0 117 NS_ENSURE_TRUE(!mBoxObject, false);
michael@0 118 mBoxObject = aBoxObject;
michael@0 119 return true;
michael@0 120 }
michael@0 121
michael@0 122 virtual bool SupportsOrdinalsInChildren() MOZ_OVERRIDE;
michael@0 123
michael@0 124 virtual bool ComputesOwnOverflowArea() MOZ_OVERRIDE { return true; }
michael@0 125
michael@0 126 protected:
michael@0 127 class nsPositionChangedEvent;
michael@0 128 friend class nsPositionChangedEvent;
michael@0 129
michael@0 130 class nsPositionChangedEvent : public nsRunnable
michael@0 131 {
michael@0 132 public:
michael@0 133 nsPositionChangedEvent(nsListBoxBodyFrame* aFrame,
michael@0 134 bool aUp, int32_t aDelta) :
michael@0 135 mFrame(aFrame), mUp(aUp), mDelta(aDelta)
michael@0 136 {}
michael@0 137
michael@0 138 NS_IMETHOD Run() MOZ_OVERRIDE
michael@0 139 {
michael@0 140 if (!mFrame) {
michael@0 141 return NS_OK;
michael@0 142 }
michael@0 143
michael@0 144 mFrame->mPendingPositionChangeEvents.RemoveElement(this);
michael@0 145
michael@0 146 return mFrame->DoInternalPositionChanged(mUp, mDelta);
michael@0 147 }
michael@0 148
michael@0 149 void Revoke() {
michael@0 150 mFrame = nullptr;
michael@0 151 }
michael@0 152
michael@0 153 nsListBoxBodyFrame* mFrame;
michael@0 154 bool mUp;
michael@0 155 int32_t mDelta;
michael@0 156 };
michael@0 157
michael@0 158 void ComputeTotalRowCount();
michael@0 159 void RemoveChildFrame(nsBoxLayoutState &aState, nsIFrame *aChild);
michael@0 160
michael@0 161 nsTArray< nsRefPtr<nsPositionChangedEvent> > mPendingPositionChangeEvents;
michael@0 162 nsCOMPtr<nsPIBoxObject> mBoxObject;
michael@0 163
michael@0 164 // frame markers
michael@0 165 nsWeakFrame mTopFrame;
michael@0 166 nsIFrame* mBottomFrame;
michael@0 167 nsIFrame* mLinkupFrame;
michael@0 168
michael@0 169 nsListScrollSmoother* mScrollSmoother;
michael@0 170
michael@0 171 int32_t mRowsToPrepend;
michael@0 172
michael@0 173 // row height
michael@0 174 int32_t mRowCount;
michael@0 175 nscoord mRowHeight;
michael@0 176 nscoord mAvailableHeight;
michael@0 177 nscoord mStringWidth;
michael@0 178
michael@0 179 // scrolling
michael@0 180 int32_t mCurrentIndex; // Row-based
michael@0 181 int32_t mOldIndex;
michael@0 182 int32_t mYPosition;
michael@0 183 int32_t mTimePerRow;
michael@0 184
michael@0 185 // row height
michael@0 186 bool mRowHeightWasSet;
michael@0 187 // scrolling
michael@0 188 bool mScrolling;
michael@0 189 bool mAdjustScroll;
michael@0 190
michael@0 191 bool mReflowCallbackPosted;
michael@0 192 };
michael@0 193
michael@0 194 #endif // nsListBoxBodyFrame_h

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