зеркало из https://github.com/mozilla/gecko-dev.git
93 строки
3.5 KiB
C++
93 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* class that a parent frame uses to reflow a block frame */
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#ifndef nsBlockReflowContext_h___
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#define nsBlockReflowContext_h___
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#include "nsIFrame.h"
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#include "nsHTMLReflowMetrics.h"
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class nsBlockReflowState;
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struct nsHTMLReflowState;
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class nsLineBox;
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class nsPresContext;
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/**
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* An encapsulation of the state and algorithm for reflowing block frames.
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*/
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class nsBlockReflowContext {
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public:
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nsBlockReflowContext(nsPresContext* aPresContext,
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const nsHTMLReflowState& aParentRS);
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~nsBlockReflowContext() { }
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void ReflowBlock(const mozilla::LogicalRect& aSpace,
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bool aApplyBStartMargin,
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nsCollapsingMargin& aPrevMargin,
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nscoord aClearance,
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bool aIsAdjacentWithBStart,
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nsLineBox* aLine,
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nsHTMLReflowState& aReflowState,
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nsReflowStatus& aReflowStatus,
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nsBlockReflowState& aState);
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bool PlaceBlock(const nsHTMLReflowState& aReflowState,
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bool aForceFit,
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nsLineBox* aLine,
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nsCollapsingMargin& aBEndMarginResult /* out */,
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nsOverflowAreas& aOverflowAreas,
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nsReflowStatus aReflowStatus);
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nsCollapsingMargin& GetCarriedOutBEndMargin() {
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return mMetrics.mCarriedOutBEndMargin;
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}
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const nsHTMLReflowMetrics& GetMetrics() const {
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return mMetrics;
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}
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/**
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* Computes the collapsed block-start margin (in the context's parent's
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* writing mode) for a block whose reflow state is in aRS.
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* The computed margin is added into aMargin, whose writing mode is the
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* parent's mode as found in mMetrics.GetWritingMode(); note this may not be
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* the block's own writing mode as found in aRS.
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* If aClearanceFrame is null then this is the first optimistic pass which
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* shall assume that no frames have clearance, and we clear the HasClearance
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* on all frames encountered.
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* If non-null, this is the second pass and the caller has decided
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* aClearanceFrame needs clearance (and we will therefore stop collapsing
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* there); also, this function is responsible for marking it with
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* SetHasClearance.
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* If in the optimistic pass any frame is encountered that might possibly
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* need clearance (i.e., if we really needed the optimism assumption) then
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* we set aMayNeedRetry to true.
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* We return true if we changed the clearance state of any line and marked it
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* dirty.
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*/
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bool ComputeCollapsedBStartMargin(const nsHTMLReflowState& aRS,
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nsCollapsingMargin* aMargin,
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nsIFrame* aClearanceFrame,
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bool* aMayNeedRetry,
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bool* aIsEmpty = nullptr);
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protected:
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nsPresContext* mPresContext;
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const nsHTMLReflowState& mOuterReflowState;
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nsIFrame* mFrame;
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mozilla::LogicalRect mSpace;
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nscoord mICoord, mBCoord, mContainerWidth;
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mozilla::WritingMode mWritingMode;
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nsHTMLReflowMetrics mMetrics;
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nsCollapsingMargin mBStartMargin;
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};
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#endif /* nsBlockReflowContext_h___ */
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