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