mirror of
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291 lines
9.9 KiB
C++
291 lines
9.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* code for management of floats that implements space manager interfaces */
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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 "nsHTMLReflowState.h"
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#include "nsPresContext.h"
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#include "nsIPresShell.h"
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#include "nsLayoutAtoms.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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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(nsSpaceManager* aSpaceManager,
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const nsSize& aSpace)
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{
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NS_PRECONDITION(aSpaceManager, "null pointer");
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mSpaceManager = aSpaceManager;
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aSpaceManager->GetTranslation(mSpaceManagerX, mSpaceManagerY);
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mSpace = aSpace;
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mLeftFloats = 0;
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mRightFloats = 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, PRBool aRelaxHeightConstraint,
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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, aRelaxHeightConstraint);
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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 floats.
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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) returning (%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, PRBool aRelaxHeightConstraint)
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{
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NS_ASSERTION(mSpaceManager, "bad state, no space manager");
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PRInt32 iterations =0;
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nsSize space = mSpace;
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if (aRelaxHeightConstraint) {
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space.height = NS_UNCONSTRAINEDSIZE;
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}
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nsresult rv = mSpaceManager->GetBandData(aY, space, *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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NS_ASSERTION(mTrapezoids, "bad state, no mTrapezoids");
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if (mTrapezoids && (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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NS_POSTCONDITION(mTrapezoids, "failure allocating mTrapezoids");
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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, space, *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 floats. 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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mLeftFloats = 0;
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mRightFloats = 0;
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return;
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}
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nsBandTrapezoid* trapezoid = mTrapezoids;
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// The trapezoid to the left of the first right-floated trapezoid.
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nsBandTrapezoid* rightTrapezoid = nsnull;
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PRInt32 leftFloats = 0;
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PRInt32 rightFloats = 0;
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if (mCount > 1) {
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// If there's more than one trapezoid that means there are floats
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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 floats. Use the right-most float 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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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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const nsStyleDisplay* display = f->GetStyleDisplay();
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if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
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leftFloats++;
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}
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else if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
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rightFloats++;
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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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const nsStyleDisplay* display = trapezoid->mFrame->GetStyleDisplay();
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if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
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leftFloats++;
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}
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else if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
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rightFloats++;
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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 float using up all the available space
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leftFloats = 1;
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}
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#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
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printf("band %p has floats %d, %d\n", this, leftFloats, rightFloats);
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#endif
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mLeftFloats = leftFloats;
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mRightFloats = rightFloats;
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// We look for available space in the last trapezoid before the
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// first right float, or in the last trapezoid if there is no right
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// float or no trapezoid before the first right float.
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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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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 floats that are a part of the trapezoid are left
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// floats 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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const nsStyleDisplay* display = f->GetStyleDisplay();
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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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const nsStyleDisplay* display = trapezoid->mFrame->GetStyleDisplay();
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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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#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), floats l=%d r=%d\n",
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mAvailSpace.x, mAvailSpace.y, mAvailSpace.width, mAvailSpace.height,
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mLeftFloats, mRightFloats);
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}
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#endif
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