The Tor Browser / file comparison
comparison: layout/generic/nsBlockReflowContext.h
layout/generic/nsBlockReflowContext.h
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| -1:000000000000 | 0:78367b6b8119 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 // vim:cindent:ts=2:et:sw=2: | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 /* class that a parent frame uses to reflow a block frame */ | |
| 8 | |
| 9 #ifndef nsBlockReflowContext_h___ | |
| 10 #define nsBlockReflowContext_h___ | |
| 11 | |
| 12 #include "nsIFrame.h" | |
| 13 #include "nsHTMLReflowMetrics.h" | |
| 14 | |
| 15 class nsBlockReflowState; | |
| 16 struct nsHTMLReflowState; | |
| 17 class nsLineBox; | |
| 18 class nsPresContext; | |
| 19 class nsLineLayout; | |
| 20 struct nsBlockHorizontalAlign; | |
| 21 | |
| 22 /** | |
| 23 * An encapsulation of the state and algorithm for reflowing block frames. | |
| 24 */ | |
| 25 class nsBlockReflowContext { | |
| 26 public: | |
| 27 nsBlockReflowContext(nsPresContext* aPresContext, | |
| 28 const nsHTMLReflowState& aParentRS); | |
| 29 ~nsBlockReflowContext() { } | |
| 30 | |
| 31 nsresult ReflowBlock(const nsRect& aSpace, | |
| 32 bool aApplyTopMargin, | |
| 33 nsCollapsingMargin& aPrevMargin, | |
| 34 nscoord aClearance, | |
| 35 bool aIsAdjacentWithTop, | |
| 36 nsLineBox* aLine, | |
| 37 nsHTMLReflowState& aReflowState, | |
| 38 nsReflowStatus& aReflowStatus, | |
| 39 nsBlockReflowState& aState); | |
| 40 | |
| 41 bool PlaceBlock(const nsHTMLReflowState& aReflowState, | |
| 42 bool aForceFit, | |
| 43 nsLineBox* aLine, | |
| 44 nsCollapsingMargin& aBottomMarginResult /* out */, | |
| 45 nsOverflowAreas& aOverflowAreas, | |
| 46 nsReflowStatus aReflowStatus, | |
| 47 nscoord aContainerWidth); | |
| 48 | |
| 49 nsCollapsingMargin& GetCarriedOutBottomMargin() { | |
| 50 return mMetrics.mCarriedOutBottomMargin; | |
| 51 } | |
| 52 | |
| 53 nscoord GetTopMargin() const { | |
| 54 return mTopMargin.get(); | |
| 55 } | |
| 56 | |
| 57 const nsHTMLReflowMetrics& GetMetrics() const { | |
| 58 return mMetrics; | |
| 59 } | |
| 60 | |
| 61 /** | |
| 62 * Computes the collapsed top margin for a block whose reflow state is in aRS. | |
| 63 * The computed margin is added into aMargin. | |
| 64 * If aClearanceFrame is null then this is the first optimistic pass which shall assume | |
| 65 * that no frames have clearance, and we clear the HasClearance on all frames encountered. | |
| 66 * If non-null, this is the second pass and | |
| 67 * the caller has decided aClearanceFrame needs clearance (and we will | |
| 68 * therefore stop collapsing there); also, this function is responsible for marking | |
| 69 * it with SetHasClearance. | |
| 70 * If in the optimistic pass any frame is encountered that might possibly need | |
| 71 * clearance (i.e., if we really needed the optimism assumption) then we set aMayNeedRetry | |
| 72 * to true. | |
| 73 * We return true if we changed the clearance state of any line and marked it dirty. | |
| 74 */ | |
| 75 static bool ComputeCollapsedTopMargin(const nsHTMLReflowState& aRS, | |
| 76 nsCollapsingMargin* aMargin, nsIFrame* aClearanceFrame, | |
| 77 bool* aMayNeedRetry, bool* aIsEmpty = nullptr); | |
| 78 | |
| 79 protected: | |
| 80 nsPresContext* mPresContext; | |
| 81 const nsHTMLReflowState& mOuterReflowState; | |
| 82 | |
| 83 nsIFrame* mFrame; | |
| 84 nsRect mSpace; | |
| 85 | |
| 86 nscoord mX, mY; | |
| 87 nsHTMLReflowMetrics mMetrics; | |
| 88 nsCollapsingMargin mTopMargin; | |
| 89 }; | |
| 90 | |
| 91 #endif /* nsBlockReflowContext_h___ */ |
