зеркало из https://github.com/mozilla/gecko-dev.git
355 строки
12 KiB
C++
355 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.1 (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 the Initial Developer are Copyright (C) 1998
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the NPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the NPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
#include "nsCOMPtr.h"
|
|
#include "nsBlockBandData.h"
|
|
#include "nsIFrame.h"
|
|
#include "nsHTMLReflowState.h"
|
|
#include "nsIPresContext.h"
|
|
#include "nsIPresShell.h"
|
|
#include "nsIFrameManager.h"
|
|
#include "nsLayoutAtoms.h"
|
|
#include "nsVoidArray.h"
|
|
|
|
nsBlockBandData::nsBlockBandData()
|
|
: mSpaceManager(nsnull),
|
|
mSpaceManagerX(0),
|
|
mSpaceManagerY(0),
|
|
mSpace(0, 0)
|
|
{
|
|
mSize = NS_BLOCK_BAND_DATA_TRAPS;
|
|
mTrapezoids = mData;
|
|
}
|
|
|
|
nsBlockBandData::~nsBlockBandData()
|
|
{
|
|
if (mTrapezoids != mData) {
|
|
delete [] mTrapezoids;
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
nsBlockBandData::Init(nsSpaceManager* aSpaceManager,
|
|
const nsSize& aSpace)
|
|
{
|
|
NS_PRECONDITION(aSpaceManager, "null pointer");
|
|
|
|
mSpaceManager = aSpaceManager;
|
|
aSpaceManager->GetTranslation(mSpaceManagerX, mSpaceManagerY);
|
|
|
|
mSpace = aSpace;
|
|
mLeftFloats = 0;
|
|
mRightFloats = 0;
|
|
return NS_OK;
|
|
}
|
|
|
|
// Get the available reflow space for the current y coordinate. The
|
|
// available space is relative to our coordinate system (0,0) is our
|
|
// upper left corner.
|
|
nsresult
|
|
nsBlockBandData::GetAvailableSpace(nscoord aY, nsRect& aResult)
|
|
{
|
|
// Get the raw band data for the given Y coordinate
|
|
nsresult rv = GetBandData(aY);
|
|
if (NS_FAILED(rv)) { return rv; }
|
|
|
|
// Compute the bounding rect of the available space, i.e. space
|
|
// between any left and right floats.
|
|
ComputeAvailSpaceRect();
|
|
aResult = mAvailSpace;
|
|
#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
|
|
printf("nsBBD %p GetAvailableSpace(%d) returing (%d, %d, %d, %d)\n",
|
|
this, aY, aResult.x, aResult.y, aResult.width, aResult.height);
|
|
#endif
|
|
return NS_OK;
|
|
}
|
|
|
|
// the code below should never loop more than a very few times.
|
|
// this is a safety valve to see if we've gone off the deep end
|
|
#define ERROR_TOO_MANY_ITERATIONS 1000
|
|
|
|
/* nsBlockBandData methods should never call mSpaceManager->GetBandData directly.
|
|
* They should always call nsBlockBandData::GetBandData() instead.
|
|
*/
|
|
nsresult
|
|
nsBlockBandData::GetBandData(nscoord aY)
|
|
{
|
|
NS_ASSERTION(mSpaceManager, "bad state, no space manager");
|
|
PRInt32 iterations =0;
|
|
nsresult rv = mSpaceManager->GetBandData(aY, mSpace, *this);
|
|
while (NS_FAILED(rv)) {
|
|
iterations++;
|
|
if (iterations>ERROR_TOO_MANY_ITERATIONS)
|
|
{
|
|
NS_ASSERTION(PR_FALSE, "too many iterations in nsBlockBandData::GetBandData");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
// We need more space for our bands
|
|
NS_ASSERTION(mTrapezoids, "bad state, no mTrapezoids");
|
|
if (mTrapezoids && (mTrapezoids != mData)) {
|
|
delete [] mTrapezoids;
|
|
}
|
|
PRInt32 newSize = mSize * 2;
|
|
if (newSize<mCount) {
|
|
newSize = mCount;
|
|
}
|
|
mTrapezoids = new nsBandTrapezoid[newSize];
|
|
NS_POSTCONDITION(mTrapezoids, "failure allocating mTrapezoids");
|
|
if (!mTrapezoids) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
mSize = newSize;
|
|
rv = mSpaceManager->GetBandData(aY, mSpace, *this);
|
|
}
|
|
NS_POSTCONDITION(mCount<=mSize, "bad state, count > size");
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Computes the bounding rect of the available space, i.e. space
|
|
* between any left and right floats. Uses the current trapezoid
|
|
* data, see nsISpaceManager::GetBandData(). Also updates member
|
|
* data "availSpace".
|
|
*/
|
|
void
|
|
nsBlockBandData::ComputeAvailSpaceRect()
|
|
{
|
|
#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
|
|
printf("nsBlockBandData::ComputeAvailSpaceRect %p with count %d\n", this, mCount);
|
|
#endif
|
|
if (0 == mCount) {
|
|
mAvailSpace.x = 0;
|
|
mAvailSpace.y = 0;
|
|
mAvailSpace.width = 0;
|
|
mAvailSpace.height = 0;
|
|
mLeftFloats = 0;
|
|
mRightFloats = 0;
|
|
return;
|
|
}
|
|
|
|
nsBandTrapezoid* trapezoid = mTrapezoids;
|
|
nsBandTrapezoid* rightTrapezoid = nsnull;
|
|
|
|
PRInt32 leftFloats = 0;
|
|
PRInt32 rightFloats = 0;
|
|
if (mCount > 1) {
|
|
// If there's more than one trapezoid that means there are floats
|
|
PRInt32 i;
|
|
|
|
// Examine each trapezoid in the band, counting up the number of
|
|
// left and right floats. Use the right-most float to
|
|
// determine where the right edge of the available space is.
|
|
NS_PRECONDITION(mCount<=mSize, "bad state, count > size");
|
|
for (i = 0; i < mCount; i++) {
|
|
trapezoid = &mTrapezoids[i];
|
|
if (trapezoid->mState != nsBandTrapezoid::Available) {
|
|
#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
|
|
printf("band %p checking !Avail trap %p with frame %p\n", this, trapezoid, trapezoid->mFrame);
|
|
#endif
|
|
if (nsBandTrapezoid::OccupiedMultiple == trapezoid->mState) {
|
|
PRInt32 j, numFrames = trapezoid->mFrames->Count();
|
|
NS_ASSERTION(numFrames > 0, "bad trapezoid frame list");
|
|
for (j = 0; j < numFrames; j++) {
|
|
nsIFrame* f = (nsIFrame*) trapezoid->mFrames->ElementAt(j);
|
|
const nsStyleDisplay* display = f->GetStyleDisplay();
|
|
if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
|
|
leftFloats++;
|
|
}
|
|
else if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
|
|
rightFloats++;
|
|
if ((nsnull == rightTrapezoid) && (i > 0)) {
|
|
rightTrapezoid = &mTrapezoids[i - 1];
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
const nsStyleDisplay* display = trapezoid->mFrame->GetStyleDisplay();
|
|
if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
|
|
leftFloats++;
|
|
}
|
|
else if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
|
|
rightFloats++;
|
|
if ((nsnull == rightTrapezoid) && (i > 0)) {
|
|
rightTrapezoid = &mTrapezoids[i - 1];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (mTrapezoids[0].mState != nsBandTrapezoid::Available) {
|
|
// We have a float using up all the available space
|
|
leftFloats = 1;
|
|
}
|
|
#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
|
|
printf("band %p has floats %d, %d\n", this, leftFloats, rightFloats);
|
|
#endif
|
|
mLeftFloats = leftFloats;
|
|
mRightFloats = rightFloats;
|
|
|
|
if (nsnull != rightTrapezoid) {
|
|
trapezoid = rightTrapezoid;
|
|
}
|
|
trapezoid->GetRect(mAvailSpace);
|
|
|
|
// When there is no available space, we still need a proper X
|
|
// coordinate to place objects that end up here anyway.
|
|
if (nsBandTrapezoid::Available != trapezoid->mState) {
|
|
if (nsBandTrapezoid::OccupiedMultiple == trapezoid->mState) {
|
|
// It's not clear what coordinate to use when there is no
|
|
// available space and the space is multiply occupied...So: If
|
|
// any of the floats that are a part of the trapezoid are left
|
|
// floats then we move over to the right edge of the
|
|
// unavaliable space.
|
|
PRInt32 j, numFrames = trapezoid->mFrames->Count();
|
|
NS_ASSERTION(numFrames > 0, "bad trapezoid frame list");
|
|
for (j = 0; j < numFrames; j++) {
|
|
nsIFrame* f = (nsIFrame*) trapezoid->mFrames->ElementAt(j);
|
|
const nsStyleDisplay* display = f->GetStyleDisplay();
|
|
if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
|
|
mAvailSpace.x = mAvailSpace.XMost();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
const nsStyleDisplay* display = trapezoid->mFrame->GetStyleDisplay();
|
|
if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
|
|
mAvailSpace.x = mAvailSpace.XMost();
|
|
}
|
|
}
|
|
mAvailSpace.width = 0;
|
|
}
|
|
|
|
// Fixup width
|
|
if (NS_UNCONSTRAINEDSIZE == mSpace.width) {
|
|
mAvailSpace.width = NS_UNCONSTRAINEDSIZE;
|
|
}
|
|
#ifdef REALLY_NOISY_COMPUTEAVAILSPACERECT
|
|
printf(" ComputeAvailSpaceRect settting state mAvailSpace (%d,%d,%d,%d)\n",
|
|
mAvailSpace.x, mAvailSpace.y, mAvailSpace.width, mAvailSpace.height);
|
|
#endif
|
|
|
|
}
|
|
|
|
/**
|
|
* See if the given frame should be cleared
|
|
*/
|
|
PRBool
|
|
nsBlockBandData::ShouldClearFrame(nsIFrame* aFrame, PRUint8 aBreakType)
|
|
{
|
|
PRBool result = PR_FALSE;
|
|
const nsStyleDisplay* display = aFrame->GetStyleDisplay();
|
|
if (NS_STYLE_CLEAR_LEFT_AND_RIGHT == aBreakType) {
|
|
result = PR_TRUE;
|
|
}
|
|
else if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
|
|
if (NS_STYLE_CLEAR_LEFT == aBreakType) {
|
|
result = PR_TRUE;
|
|
}
|
|
}
|
|
else if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
|
|
if (NS_STYLE_CLEAR_RIGHT == aBreakType) {
|
|
result = PR_TRUE;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
// XXX optimization? use mFloats to avoid doing anything
|
|
nscoord
|
|
nsBlockBandData::ClearFloats(nscoord aY, PRUint8 aBreakType)
|
|
{
|
|
for (;;) {
|
|
nsresult rv = GetBandData(aY);
|
|
if (NS_FAILED(rv)) {
|
|
break; // something is seriously wrong, bail
|
|
}
|
|
ComputeAvailSpaceRect();
|
|
|
|
// Compute aYS as aY in space-manager "root" coordinates.
|
|
nscoord aYS = aY + mSpaceManagerY;
|
|
|
|
// Find the largest frame YMost for the appropriate floats in
|
|
// this band.
|
|
nscoord yMost = aYS;
|
|
PRInt32 i;
|
|
NS_PRECONDITION(mCount<=mSize, "bad state, count > size");
|
|
for (i = 0; i < mCount; i++) {
|
|
nsBandTrapezoid* trapezoid = &mTrapezoids[i];
|
|
if (nsBandTrapezoid::Available != trapezoid->mState) {
|
|
if (nsBandTrapezoid::OccupiedMultiple == trapezoid->mState) {
|
|
PRInt32 fn, numFrames = trapezoid->mFrames->Count();
|
|
NS_ASSERTION(numFrames > 0, "bad trapezoid frame list");
|
|
for (fn = 0; fn < numFrames; fn++) {
|
|
nsIFrame* frame = (nsIFrame*) trapezoid->mFrames->ElementAt(fn);
|
|
if (ShouldClearFrame(frame, aBreakType)) {
|
|
nscoord ym = trapezoid->mBottomY + mSpaceManagerY;
|
|
if (ym > yMost) yMost = ym;
|
|
}
|
|
}
|
|
}
|
|
else if (ShouldClearFrame(trapezoid->mFrame, aBreakType)) {
|
|
nscoord ym = trapezoid->mBottomY + mSpaceManagerY;
|
|
if (ym > yMost) yMost = ym;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If yMost is unchanged (aYS) then there were no appropriate
|
|
// floats in the band. Time to stop clearing.
|
|
if (yMost == aYS) {
|
|
break;
|
|
}
|
|
aY = aY + (yMost - aYS);
|
|
}
|
|
return aY;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void nsBlockBandData::List()
|
|
{
|
|
printf("nsBlockBandData %p sm=%p, sm coord = (%d,%d), mSpace = (%d,%d)\n",
|
|
this, mSpaceManager, mSpaceManagerX, mSpaceManagerY,
|
|
mSpace.width, mSpace.height);
|
|
printf(" availSpace=(%d, %d, %d, %d), floats l=%d r=%d\n",
|
|
mAvailSpace.x, mAvailSpace.y, mAvailSpace.width, mAvailSpace.height,
|
|
mLeftFloats, mRightFloats);
|
|
}
|
|
#endif
|