зеркало из https://github.com/mozilla/gecko-dev.git
495 строки
16 KiB
C++
495 строки
16 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
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations 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
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsCOMPtr.h"
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#include "nsBlockBandData.h"
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#include "nsIFrame.h"
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#include "nsIStyleContext.h"
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#include "nsIPresContext.h"
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#include "nsIPresShell.h"
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#include "nsIFrameManager.h"
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#include "nsLayoutAtoms.h"
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#include "nsVoidArray.h"
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nsBlockBandData::nsBlockBandData()
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: mSpaceManager(nsnull),
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mSpaceManagerX(0),
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mSpaceManagerY(0),
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mSpace(0, 0)
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{
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mSize = NS_BLOCK_BAND_DATA_TRAPS;
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mTrapezoids = mData;
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}
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nsBlockBandData::~nsBlockBandData()
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{
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NS_IF_RELEASE(mSpaceManager);
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if (mTrapezoids != mData) {
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delete [] mTrapezoids;
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}
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}
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nsresult
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nsBlockBandData::Init(nsISpaceManager* aSpaceManager,
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const nsSize& aSpace)
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{
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NS_PRECONDITION(nsnull != aSpaceManager, "null pointer");
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if (nsnull == aSpaceManager) {
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return NS_ERROR_NULL_POINTER;
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}
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NS_IF_RELEASE(mSpaceManager);
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mSpaceManager = aSpaceManager;
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NS_ADDREF(aSpaceManager);
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aSpaceManager->GetTranslation(mSpaceManagerX, mSpaceManagerY);
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mSpace = aSpace;
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mLeftFloaters = 0;
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mRightFloaters = 0;
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return NS_OK;
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}
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// Get the available reflow space for the current y coordinate. The
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// available space is relative to our coordinate system (0,0) is our
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// upper left corner.
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nsresult
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nsBlockBandData::GetAvailableSpace(nscoord aY, nsRect& aResult)
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{
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// Get the raw band data for the given Y coordinate
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nsresult rv = GetBandData(aY);
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if (NS_FAILED(rv)) { return rv; }
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// Compute the bounding rect of the available space, i.e. space
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// between any left and right floaters.
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ComputeAvailSpaceRect();
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aResult = mAvailSpace;
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#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
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printf("nsBBD %p GetAvailableSpace(%d) returing (%d, %d, %d, %d)\n",
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this, aY, aResult.x, aResult.y, aResult.width, aResult.height);
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#endif
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return NS_OK;
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}
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// the code below should never loop more than a very few times.
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// this is a safety valve to see if we've gone off the deep end
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#define ERROR_TOO_MANY_ITERATIONS 1000
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/* nsBlockBandData methods should never call mSpaceManager->GetBandData directly.
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* They should always call nsBlockBandData::GetBandData() instead.
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*/
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nsresult
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nsBlockBandData::GetBandData(nscoord aY)
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{
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PRInt32 iterations =0;
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nsresult rv = mSpaceManager->GetBandData(aY, mSpace, *this);
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while (NS_FAILED(rv)) {
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iterations++;
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if (iterations>ERROR_TOO_MANY_ITERATIONS)
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{
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NS_ASSERTION(PR_FALSE, "too many iterations in nsBlockBandData::GetBandData");
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return NS_ERROR_FAILURE;
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}
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// We need more space for our bands
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if (mTrapezoids != mData) {
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delete [] mTrapezoids;
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}
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PRInt32 newSize = mSize * 2;
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if (newSize<mCount) {
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newSize = mCount;
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}
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mTrapezoids = new nsBandTrapezoid[newSize];
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if (!mTrapezoids) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mSize = newSize;
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rv = mSpaceManager->GetBandData(aY, mSpace, *this);
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}
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NS_POSTCONDITION(mCount<=mSize, "bad state, count > size");
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return NS_OK;
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}
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/**
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* Computes the bounding rect of the available space, i.e. space
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* between any left and right floaters. Uses the current trapezoid
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* data, see nsISpaceManager::GetBandData(). Also updates member
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* data "availSpace".
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*/
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void
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nsBlockBandData::ComputeAvailSpaceRect()
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{
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#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
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printf("nsBlockBandData::ComputeAvailSpaceRect %p with count %d\n", this, mCount);
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#endif
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if (0 == mCount) {
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mAvailSpace.x = 0;
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mAvailSpace.y = 0;
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mAvailSpace.width = 0;
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mAvailSpace.height = 0;
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return;
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}
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nsBandTrapezoid* trapezoid = mTrapezoids;
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nsBandTrapezoid* rightTrapezoid = nsnull;
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PRInt32 leftFloaters = 0;
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PRInt32 rightFloaters = 0;
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if (mCount > 1) {
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// If there's more than one trapezoid that means there are floaters
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PRInt32 i;
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// Examine each trapezoid in the band, counting up the number of
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// left and right floaters. Use the right-most floater to
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// determine where the right edge of the available space is.
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NS_PRECONDITION(mCount<=mSize, "bad state, count > size");
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for (i = 0; i < mCount; i++) {
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trapezoid = &mTrapezoids[i];
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if (trapezoid->mState != nsBandTrapezoid::Available) {
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#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
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printf("band %p checking !Avail trap %p with frame %p\n", this, trapezoid, trapezoid->mFrame);
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#endif
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const nsStyleDisplay* display;
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if (nsBandTrapezoid::OccupiedMultiple == trapezoid->mState) {
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PRInt32 j, numFrames = trapezoid->mFrames->Count();
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NS_ASSERTION(numFrames > 0, "bad trapezoid frame list");
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for (j = 0; j < numFrames; j++) {
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nsIFrame* f = (nsIFrame*) trapezoid->mFrames->ElementAt(j);
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f->GetStyleData(eStyleStruct_Display,
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(const nsStyleStruct*&)display);
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if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
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leftFloaters++;
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}
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else if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
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rightFloaters++;
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if ((nsnull == rightTrapezoid) && (i > 0)) {
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rightTrapezoid = &mTrapezoids[i - 1];
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}
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}
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}
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} else {
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trapezoid->mFrame->GetStyleData(eStyleStruct_Display,
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(const nsStyleStruct*&)display);
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if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
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leftFloaters++;
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}
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else if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
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rightFloaters++;
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if ((nsnull == rightTrapezoid) && (i > 0)) {
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rightTrapezoid = &mTrapezoids[i - 1];
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}
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}
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}
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}
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}
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}
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else if (mTrapezoids[0].mState != nsBandTrapezoid::Available) {
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// We have a floater using up all the available space
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leftFloaters = 1;
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}
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#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
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printf("band %p has floaters %d, %d\n", this, leftFloaters, rightFloaters);
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#endif
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mLeftFloaters = leftFloaters;
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mRightFloaters = rightFloaters;
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if (nsnull != rightTrapezoid) {
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trapezoid = rightTrapezoid;
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}
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trapezoid->GetRect(mAvailSpace);
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// When there is no available space, we still need a proper X
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// coordinate to place objects that end up here anyway.
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if (nsBandTrapezoid::Available != trapezoid->mState) {
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const nsStyleDisplay* display;
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if (nsBandTrapezoid::OccupiedMultiple == trapezoid->mState) {
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// It's not clear what coordinate to use when there is no
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// available space and the space is multiply occupied...So: If
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// any of the floaters that are a part of the trapezoid are left
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// floaters then we move over to the right edge of the
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// unavaliable space.
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PRInt32 j, numFrames = trapezoid->mFrames->Count();
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NS_ASSERTION(numFrames > 0, "bad trapezoid frame list");
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for (j = 0; j < numFrames; j++) {
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nsIFrame* f = (nsIFrame*) trapezoid->mFrames->ElementAt(j);
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f->GetStyleData(eStyleStruct_Display,
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(const nsStyleStruct*&)display);
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if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
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mAvailSpace.x = mAvailSpace.XMost();
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break;
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}
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}
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}
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else {
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trapezoid->mFrame->GetStyleData(eStyleStruct_Display,
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(const nsStyleStruct*&)display);
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if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
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mAvailSpace.x = mAvailSpace.XMost();
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}
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}
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mAvailSpace.width = 0;
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}
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// Fixup width
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if (NS_UNCONSTRAINEDSIZE == mSpace.width) {
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mAvailSpace.width = NS_UNCONSTRAINEDSIZE;
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}
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#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
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printf(" ComputeAvailSpaceRect settting state mAvailSpace (%d,%d,%d,%d)\n",
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mAvailSpace.x, mAvailSpace.y, mAvailSpace.width, mAvailSpace.height);
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#endif
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}
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/**
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* See if the given frame should be cleared
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*/
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PRBool
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nsBlockBandData::ShouldClearFrame(nsIFrame* aFrame, PRUint8 aBreakType)
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{
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PRBool result = PR_FALSE;
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const nsStyleDisplay* display;
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nsresult rv = aFrame->GetStyleData(eStyleStruct_Display,
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(const nsStyleStruct*&)display);
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if (NS_SUCCEEDED(rv) && (nsnull != display)) {
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if (NS_STYLE_CLEAR_LEFT_AND_RIGHT == aBreakType) {
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result = PR_TRUE;
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}
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else if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
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if (NS_STYLE_CLEAR_LEFT == aBreakType) {
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result = PR_TRUE;
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}
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}
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else if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
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if (NS_STYLE_CLEAR_RIGHT == aBreakType) {
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result = PR_TRUE;
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}
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}
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}
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return result;
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}
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// XXX optimization? use mFloaters to avoid doing anything
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nscoord
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nsBlockBandData::ClearFloaters(nscoord aY, PRUint8 aBreakType)
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{
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for (;;) {
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nsresult rv = GetBandData(aY);
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if (NS_FAILED(rv)) {
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break; // something is seriously wrong, bail
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}
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ComputeAvailSpaceRect();
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// Compute aYS as aY in space-manager "root" coordinates.
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nscoord aYS = aY + mSpaceManagerY;
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// Find the largest frame YMost for the appropriate floaters in
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// this band.
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nscoord yMost = aYS;
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PRInt32 i;
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NS_PRECONDITION(mCount<=mSize, "bad state, count > size");
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for (i = 0; i < mCount; i++) {
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nsBandTrapezoid* trapezoid = &mTrapezoids[i];
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if (nsBandTrapezoid::Available != trapezoid->mState) {
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if (nsBandTrapezoid::OccupiedMultiple == trapezoid->mState) {
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PRInt32 fn, numFrames = trapezoid->mFrames->Count();
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NS_ASSERTION(numFrames > 0, "bad trapezoid frame list");
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for (fn = 0; fn < numFrames; fn++) {
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nsIFrame* frame = (nsIFrame*) trapezoid->mFrames->ElementAt(fn);
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if (ShouldClearFrame(frame, aBreakType)) {
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nscoord ym = trapezoid->mBottomY + mSpaceManagerY;
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if (ym > yMost) yMost = ym;
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}
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}
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}
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else if (ShouldClearFrame(trapezoid->mFrame, aBreakType)) {
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nscoord ym = trapezoid->mBottomY + mSpaceManagerY;
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if (ym > yMost) yMost = ym;
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}
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}
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}
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// If yMost is unchanged (aYS) then there were no appropriate
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// floaters in the band. Time to stop clearing.
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if (yMost == aYS) {
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break;
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}
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aY = aY + (yMost - aYS);
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}
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return aY;
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}
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//----------------------------------------------------------------------
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static void
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MaxElementSizePropertyDtor(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIAtom* aPropertyName,
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void* aPropertyValue)
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{
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nsSize* size = (nsSize*) aPropertyValue;
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delete size;
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}
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void
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nsBlockBandData::StoreMaxElementSize(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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const nsSize& aMaxElementSize)
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{
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nsCOMPtr<nsIPresShell> shell;
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aPresContext->GetShell(getter_AddRefs(shell));
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if (shell) {
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nsCOMPtr<nsIFrameManager> mgr;
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shell->GetFrameManager(getter_AddRefs(mgr));
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if (mgr) {
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nsSize* size = new nsSize(aMaxElementSize);
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if (size) {
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mgr->SetFrameProperty(aFrame, nsLayoutAtoms::maxElementSizeProperty,
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size, MaxElementSizePropertyDtor);
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}
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}
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}
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}
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void
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nsBlockBandData::RecoverMaxElementSize(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsSize* aResult)
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{
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if (!aResult) return;
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nsSize answer(0, 0);
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nsCOMPtr<nsIPresShell> shell;
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aPresContext->GetShell(getter_AddRefs(shell));
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if (shell) {
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nsCOMPtr<nsIFrameManager> mgr;
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shell->GetFrameManager(getter_AddRefs(mgr));
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if (mgr) {
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nsSize* size = nsnull;
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mgr->GetFrameProperty(aFrame, nsLayoutAtoms::maxElementSizeProperty,
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0, (void**) &size);
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if (size) {
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answer = *size;
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}
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}
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}
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*aResult = answer;
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}
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void
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nsBlockBandData::GetMaxElementSize(nsIPresContext* aPresContext,
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nscoord* aWidthResult,
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nscoord* aHeightResult) const
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{
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nsCOMPtr<nsIFrameManager> mgr;
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nsCOMPtr<nsIPresShell> shell;
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aPresContext->GetShell(getter_AddRefs(shell));
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if (shell) {
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shell->GetFrameManager(getter_AddRefs(mgr));
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}
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nsRect r;
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nscoord maxWidth = 0;
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nscoord maxHeight = 0;
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for (PRInt32 i = 0; i < mCount; i++) {
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const nsBandTrapezoid* trap = &mTrapezoids[i];
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if (trap->mState != nsBandTrapezoid::Available) {
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// Note: get the total height of the frame to compute the maxHeight,
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// not just the height that is part of this band.
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if (nsBandTrapezoid::OccupiedMultiple == trap->mState) {
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PRBool usedBackupValue = PR_FALSE;
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PRInt32 j, numFrames = trap->mFrames->Count();
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NS_ASSERTION(numFrames > 0, "bad trapezoid frame list");
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for (j = 0; j < numFrames; j++) {
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PRBool useBackupValue = PR_TRUE;
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nsIFrame* f = (nsIFrame*) trap->mFrames->ElementAt(j);
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if (mgr) {
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nsSize* maxElementSize = nsnull;
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mgr->GetFrameProperty(f, nsLayoutAtoms::maxElementSizeProperty,
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0, (void**) &maxElementSize);
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if (maxElementSize) {
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useBackupValue = PR_FALSE;
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if (maxElementSize->width > maxWidth) {
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maxWidth = maxElementSize->width;
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}
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if (maxElementSize->height > maxHeight) {
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maxHeight = maxElementSize->height;
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}
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}
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}
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if (useBackupValue) {
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usedBackupValue = PR_TRUE;
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f->GetRect(r);
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if (r.height > maxHeight) maxHeight = r.height;
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}
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}
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// Get the width of the impacted area and update the maxWidth
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if (usedBackupValue) {
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trap->GetRect(r);
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if (r.width > maxWidth) maxWidth = r.width;
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}
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} else {
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PRBool useBackupValue = PR_TRUE;
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if (mgr) {
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nsSize* maxElementSize = nsnull;
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mgr->GetFrameProperty(trap->mFrame,
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nsLayoutAtoms::maxElementSizeProperty,
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0, (void**) &maxElementSize);
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if (maxElementSize) {
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useBackupValue = PR_FALSE;
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if (maxElementSize->width > maxWidth) {
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maxWidth = maxElementSize->width;
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}
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if (maxElementSize->height > maxHeight) {
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maxHeight = maxElementSize->height;
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}
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}
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}
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if (useBackupValue) {
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trap->GetRect(r);
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if (r.width > maxWidth) maxWidth = r.width;
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trap->mFrame->GetRect(r);
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if (r.height > maxHeight) maxHeight = r.height;
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}
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}
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}
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}
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*aWidthResult = maxWidth;
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*aHeightResult = maxHeight;
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}
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#ifdef DEBUG
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void nsBlockBandData::List()
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{
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printf("nsBlockBandData %p sm=%p, sm coord = (%d,%d), mSpace = (%d,%d)\n",
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this, mSpaceManager, mSpaceManagerX, mSpaceManagerY,
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mSpace.width, mSpace.height);
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printf(" availSpace=(%d, %d, %d, %d), floaters l=%d r=%d\n",
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mAvailSpace.x, mAvailSpace.y, mAvailSpace.width, mAvailSpace.height,
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mLeftFloaters, mRightFloaters);
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}
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#endif
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