зеркало из https://github.com/mozilla/gecko-dev.git
128 строки
3.5 KiB
C++
128 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#ifndef nsBlockReflowContext_h___
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#define nsBlockReflowContext_h___
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#include "nsIHTMLReflow.h"
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class nsBlockFrame;
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class nsIFrame;
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class nsIPresContext;
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class nsLineLayout;
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struct nsStylePosition;
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struct nsStyleSpacing;
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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(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aParentRS,
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PRBool aComputeMaxElementSize);
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~nsBlockReflowContext() { }
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void SetNextRCFrame(nsIFrame* aNextRCFrame) {
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mNextRCFrame = aNextRCFrame;
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}
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nsIFrame* GetNextRCFrame() const {
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return mNextRCFrame;
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}
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nsresult ReflowBlock(nsIFrame* aFrame,
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const nsRect& aSpace,
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PRBool aApplyTopMargin,
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nscoord aPrevBottomMargin,
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PRBool aIsAdjacentWithTop,
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nsMargin& aComputedOffsets,
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nsReflowStatus& aReflowStatus);
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PRBool PlaceBlock(PRBool aForceFit,
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const nsMargin& aComputedOffsets,
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nscoord* aBottomMarginResult,
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nsRect& aInFlowBounds,
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nsRect& aCombinedRect);
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nscoord GetCarriedOutBottomMargin() const {
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return mMetrics.mCarriedOutBottomMargin;
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}
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nscoord GetTopMargin() const {
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return mTopMargin;
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}
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const nsMargin& GetMargin() const {
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return mMargin;
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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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const nsSize& GetMaxElementSize() const {
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return mMaxElementSize;
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}
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// Compute the largest of two adjacent vertical margins, as per the
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// CSS2 spec section 8.3.1
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static nscoord MaxMargin(nscoord a, nscoord b) {
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if (a < 0) {
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if (b < 0) {
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if (a < b) return a;
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return b;
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}
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return b + a;
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}
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else if (b < 0) {
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return a + b;
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}
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if (a > b) return a;
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return b;
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}
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static PRBool IsHTMLParagraph(nsIFrame* aFrame);
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static nscoord ComputeCollapsedTopMargin(nsIPresContext* aPresContext,
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nsHTMLReflowState& aRS);
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protected:
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nsStyleUnit GetRealMarginLeftUnit();
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nsStyleUnit GetRealMarginRightUnit();
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nsIPresContext* mPresContext;
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const nsHTMLReflowState& mOuterReflowState;
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nsIFrame* mFrame;
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nsRect mSpace;
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nsIFrame* mNextRCFrame;
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// Spacing style for the frame we are reflowing; only valid after reflow
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const nsStyleSpacing* mStyleSpacing;
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nsMargin mMargin;
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nscoord mX, mY;
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nsHTMLReflowMetrics mMetrics;
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nscoord mTopMargin;
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nsSize mMaxElementSize;
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PRBool mIsTable;
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};
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#endif /* nsBlockReflowContext_h___ */
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