The Tor Browser / file comparison
comparison: layout/generic/nsAbsoluteContainingBlock.h
layout/generic/nsAbsoluteContainingBlock.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
deleted
inserted
replaced
| -1:000000000000 | 0:4e22492f7a9f |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* | |
| 7 * code for managing absolutely positioned children of a rendering | |
| 8 * object that is a containing block for them | |
| 9 */ | |
| 10 | |
| 11 #ifndef nsAbsoluteContainingBlock_h___ | |
| 12 #define nsAbsoluteContainingBlock_h___ | |
| 13 | |
| 14 #include "nsFrameList.h" | |
| 15 #include "nsIFrame.h" | |
| 16 | |
| 17 class nsContainerFrame; | |
| 18 class nsHTMLReflowState; | |
| 19 class nsPresContext; | |
| 20 | |
| 21 /** | |
| 22 * This class contains the logic for being an absolute containing block. This | |
| 23 * class is used within viewport frames (for frames representing content with | |
| 24 * fixed position) and blocks (for frames representing absolutely positioned | |
| 25 * content), since each set of frames is absolutely positioned with respect to | |
| 26 * its parent. | |
| 27 * | |
| 28 * There is no principal child list, just a named child list which contains | |
| 29 * the absolutely positioned frames (kAbsoluteList or kFixedList). | |
| 30 * | |
| 31 * All functions include as the first argument the frame that is delegating | |
| 32 * the request. | |
| 33 */ | |
| 34 class nsAbsoluteContainingBlock | |
| 35 { | |
| 36 public: | |
| 37 typedef nsIFrame::ChildListID ChildListID; | |
| 38 | |
| 39 nsAbsoluteContainingBlock(ChildListID aChildListID) | |
| 40 #ifdef DEBUG | |
| 41 : mChildListID(aChildListID) | |
| 42 #endif | |
| 43 { | |
| 44 MOZ_ASSERT(mChildListID == nsIFrame::kAbsoluteList || | |
| 45 mChildListID == nsIFrame::kFixedList, | |
| 46 "should either represent position:fixed or absolute content"); | |
| 47 } | |
| 48 | |
| 49 const nsFrameList& GetChildList() const { return mAbsoluteFrames; } | |
| 50 void AppendChildList(nsTArray<nsIFrame::ChildList>* aLists, | |
| 51 ChildListID aListID) const | |
| 52 { | |
| 53 NS_ASSERTION(aListID == mChildListID, "wrong list ID"); | |
| 54 GetChildList().AppendIfNonempty(aLists, aListID); | |
| 55 } | |
| 56 | |
| 57 nsresult SetInitialChildList(nsIFrame* aDelegatingFrame, | |
| 58 ChildListID aListID, | |
| 59 nsFrameList& aChildList); | |
| 60 nsresult AppendFrames(nsIFrame* aDelegatingFrame, | |
| 61 ChildListID aListID, | |
| 62 nsFrameList& aFrameList); | |
| 63 nsresult InsertFrames(nsIFrame* aDelegatingFrame, | |
| 64 ChildListID aListID, | |
| 65 nsIFrame* aPrevFrame, | |
| 66 nsFrameList& aFrameList); | |
| 67 void RemoveFrame(nsIFrame* aDelegatingFrame, | |
| 68 ChildListID aListID, | |
| 69 nsIFrame* aOldFrame); | |
| 70 | |
| 71 /** | |
| 72 * Called by the delegating frame after it has done its reflow first. This | |
| 73 * function will reflow any absolutely positioned child frames that need to | |
| 74 * be reflowed, e.g., because the absolutely positioned child frame has | |
| 75 * 'auto' for an offset, or a percentage based width or height. | |
| 76 * | |
| 77 * @param aOverflowAreas, if non-null, is unioned with (in the local | |
| 78 * coordinate space) the overflow areas of the absolutely positioned | |
| 79 * children. | |
| 80 * | |
| 81 * @param aReflowStatus is assumed to be already-initialized, e.g. with the | |
| 82 * status of the delegating frame's main reflow. This function merges in the | |
| 83 * statuses of the absolutely positioned children's reflows. | |
| 84 */ | |
| 85 nsresult Reflow(nsContainerFrame* aDelegatingFrame, | |
| 86 nsPresContext* aPresContext, | |
| 87 const nsHTMLReflowState& aReflowState, | |
| 88 nsReflowStatus& aReflowStatus, | |
| 89 const nsRect& aContainingBlock, | |
| 90 bool aConstrainHeight, | |
| 91 bool aCBWidthChanged, | |
| 92 bool aCBHeightChanged, | |
| 93 nsOverflowAreas* aOverflowAreas); | |
| 94 | |
| 95 void DestroyFrames(nsIFrame* aDelegatingFrame, | |
| 96 nsIFrame* aDestructRoot); | |
| 97 | |
| 98 bool HasAbsoluteFrames() const { return mAbsoluteFrames.NotEmpty(); } | |
| 99 | |
| 100 /** | |
| 101 * Mark our size-dependent absolute frames with NS_FRAME_HAS_DIRTY_CHILDREN | |
| 102 * so that we'll make sure to reflow them. | |
| 103 */ | |
| 104 void MarkSizeDependentFramesDirty(); | |
| 105 | |
| 106 /** | |
| 107 * Mark all our absolute frames with NS_FRAME_IS_DIRTY. | |
| 108 */ | |
| 109 void MarkAllFramesDirty(); | |
| 110 | |
| 111 protected: | |
| 112 /** | |
| 113 * Returns true if the position of aFrame depends on the position of | |
| 114 * its placeholder or if the position or size of aFrame depends on a | |
| 115 * containing block dimension that changed. | |
| 116 */ | |
| 117 bool FrameDependsOnContainer(nsIFrame* aFrame, bool aCBWidthChanged, | |
| 118 bool aCBHeightChanged); | |
| 119 | |
| 120 nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame, | |
| 121 nsPresContext* aPresContext, | |
| 122 const nsHTMLReflowState& aReflowState, | |
| 123 const nsRect& aContainingBlockRect, | |
| 124 bool aConstrainHeight, | |
| 125 nsIFrame* aKidFrame, | |
| 126 nsReflowStatus& aStatus, | |
| 127 nsOverflowAreas* aOverflowAreas); | |
| 128 | |
| 129 /** | |
| 130 * Mark our absolute frames dirty. | |
| 131 * @param aMarkAllDirty if true, all will be marked with NS_FRAME_IS_DIRTY. | |
| 132 * Otherwise, the size-dependant ones will be marked with | |
| 133 * NS_FRAME_HAS_DIRTY_CHILDREN. | |
| 134 */ | |
| 135 void DoMarkFramesDirty(bool aMarkAllDirty); | |
| 136 | |
| 137 protected: | |
| 138 nsFrameList mAbsoluteFrames; // additional named child list | |
| 139 | |
| 140 #ifdef DEBUG | |
| 141 ChildListID const mChildListID; // kFixedList or kAbsoluteList | |
| 142 #endif | |
| 143 }; | |
| 144 | |
| 145 #endif /* nsnsAbsoluteContainingBlock_h___ */ |
