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gecko-dev/layout/generic/nsLineBox.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=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):
* L. David Baron <dbaron@dbaron.org>
* Pierre Phaneuf <pp@ludusdesign.com>
*
* 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 "nsLineBox.h"
#include "nsSpaceManager.h"
#include "nsLineLayout.h"
#include "prprf.h"
#include "nsBlockFrame.h"
#include "nsITextContent.h"
#include "nsLayoutAtoms.h"
#ifdef DEBUG
static PRInt32 ctorCount;
PRInt32 nsLineBox::GetCtorCount() { return ctorCount; }
#endif
MOZ_DECL_CTOR_COUNTER(nsLineBox)
nsLineBox::nsLineBox(nsIFrame* aFrame, PRInt32 aCount, PRBool aIsBlock)
: mFirstChild(aFrame),
mBounds(0, 0, 0, 0),
mMaxElementWidth(0),
mMaximumWidth(-1),
mData(nsnull)
{
MOZ_COUNT_CTOR(nsLineBox);
#ifdef DEBUG
++ctorCount;
#endif
mAllFlags = 0;
#if NS_STYLE_CLEAR_NONE > 0
mFlags.mBreakType = NS_STYLE_CLEAR_NONE;
#endif
SetChildCount(aCount);
MarkDirty();
mFlags.mBlock = aIsBlock;
}
nsLineBox::~nsLineBox()
{
MOZ_COUNT_DTOR(nsLineBox);
Cleanup();
}
nsLineBox*
NS_NewLineBox(nsIPresShell* aPresShell, nsIFrame* aFrame,
PRInt32 aCount, PRBool aIsBlock)
{
return new (aPresShell)nsLineBox(aFrame, aCount, aIsBlock);
}
// Overloaded new operator. Uses an arena (which comes from the presShell)
// to perform the allocation.
void*
nsLineBox::operator new(size_t sz, nsIPresShell* aPresShell) CPP_THROW_NEW
{
void* result = nsnull;
aPresShell->AllocateFrame(sz, &result);
return result;
}
// Overloaded delete operator. Doesn't actually free the memory, because we
// use an arena
void
nsLineBox::operator delete(void* aPtr, size_t sz)
{
}
void
nsLineBox::Destroy(nsIPresShell* aPresShell)
{
// Destroy the object. This won't actually free the memory, though
delete this;
// Have the pres shell recycle the memory
aPresShell->FreeFrame(sizeof(*this), (void*)this);
}
void
nsLineBox::Cleanup()
{
if (mData) {
if (IsBlock()) {
delete mBlockData;
}
else {
delete mInlineData;
}
mData = nsnull;
}
}
#ifdef DEBUG
static void
ListFloats(FILE* out, PRInt32 aIndent, const nsFloatCacheList& aFloats)
{
nsAutoString frameName;
nsFloatCache* fc = aFloats.Head();
while (fc) {
nsFrame::IndentBy(out, aIndent);
nsPlaceholderFrame* ph = fc->mPlaceholder;
if (nsnull != ph) {
fprintf(out, "placeholder@%p ", NS_STATIC_CAST(void*, ph));
nsIFrame* frame = ph->GetOutOfFlowFrame();
if (nsnull != frame) {
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(frame->QueryInterface(NS_GET_IID(nsIFrameDebug), (void**)&frameDebug))) {
frameDebug->GetFrameName(frameName);
fputs(NS_LossyConvertUCS2toASCII(frameName).get(), out);
}
}
fprintf(out, " %s region={%d,%d,%d,%d} combinedArea={%d,%d,%d,%d}",
fc->mIsCurrentLineFloat ? "cl" : "bcl",
fc->mRegion.x, fc->mRegion.y,
fc->mRegion.width, fc->mRegion.height,
fc->mCombinedArea.x, fc->mCombinedArea.y,
fc->mCombinedArea.width, fc->mCombinedArea.height);
fprintf(out, "\n");
}
fc = fc->Next();
}
}
#endif
#ifdef DEBUG
const char *
BreakTypeToString(PRUint8 aBreakType)
{
switch (aBreakType) {
case NS_STYLE_CLEAR_NONE: return "nobr";
case NS_STYLE_CLEAR_LEFT: return "leftbr";
case NS_STYLE_CLEAR_RIGHT: return "rightbr";
case NS_STYLE_CLEAR_LEFT_AND_RIGHT: return "leftbr+rightbr";
case NS_STYLE_CLEAR_LINE: return "linebr";
case NS_STYLE_CLEAR_BLOCK: return "blockbr";
case NS_STYLE_CLEAR_COLUMN: return "columnbr";
case NS_STYLE_CLEAR_PAGE: return "pagebr";
default:
break;
}
return "unknown";
}
char*
nsLineBox::StateToString(char* aBuf, PRInt32 aBufSize) const
{
PR_snprintf(aBuf, aBufSize, "%s,%s,%s,%s,%s,%s[0x%x]",
IsBlock() ? "block" : "inline",
IsDirty() ? "dirty" : "clean",
IsPreviousMarginDirty() ? "prevmargindirty" : "prevmarginclean",
IsImpactedByFloat() ? "impacted" : "not impacted",
IsLineWrapped() ? "wrapped" : "not wrapped",
BreakTypeToString(GetBreakType()),
mAllFlags);
return aBuf;
}
void
nsLineBox::List(nsIPresContext* aPresContext, FILE* out, PRInt32 aIndent) const
{
PRInt32 i;
for (i = aIndent; --i >= 0; ) fputs(" ", out);
char cbuf[100];
fprintf(out, "line %p: count=%d state=%s ",
NS_STATIC_CAST(const void*, this), GetChildCount(),
StateToString(cbuf, sizeof(cbuf)));
if (IsBlock() && !GetCarriedOutBottomMargin().IsZero()) {
fprintf(out, "bm=%d ", GetCarriedOutBottomMargin().get());
}
if (0 != mMaxElementWidth) {
fprintf(out, "mew=%d ", mMaxElementWidth);
}
fprintf(out, "{%d,%d,%d,%d} ",
mBounds.x, mBounds.y, mBounds.width, mBounds.height);
if (mData) {
fprintf(out, "ca={%d,%d,%d,%d} ",
mData->mCombinedArea.x, mData->mCombinedArea.y,
mData->mCombinedArea.width, mData->mCombinedArea.height);
}
fprintf(out, "<\n");
nsIFrame* frame = mFirstChild;
PRInt32 n = GetChildCount();
while (--n >= 0) {
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(frame->QueryInterface(NS_GET_IID(nsIFrameDebug), (void**)&frameDebug))) {
frameDebug->List(aPresContext, out, aIndent + 1);
}
frame = frame->GetNextSibling();
}
for (i = aIndent; --i >= 0; ) fputs(" ", out);
if (HasFloats()) {
fputs("> floats <\n", out);
ListFloats(out, aIndent + 1, mInlineData->mFloats);
for (i = aIndent; --i >= 0; ) fputs(" ", out);
}
fputs(">\n", out);
}
#endif
nsIFrame*
nsLineBox::LastChild() const
{
nsIFrame* frame = mFirstChild;
PRInt32 n = GetChildCount() - 1;
while (--n >= 0) {
frame = frame->GetNextSibling();
}
return frame;
}
PRBool
nsLineBox::IsLastChild(nsIFrame* aFrame) const
{
nsIFrame* lastFrame = LastChild();
return aFrame == lastFrame;
}
PRInt32
nsLineBox::IndexOf(nsIFrame* aFrame) const
{
PRInt32 i, n = GetChildCount();
nsIFrame* frame = mFirstChild;
for (i = 0; i < n; i++) {
if (frame == aFrame) {
return i;
}
frame = frame->GetNextSibling();
}
return -1;
}
PRBool
nsLineBox::IsEmpty() const
{
if (IsBlock())
return mFirstChild->IsEmpty();
PRInt32 n;
nsIFrame *kid;
for (n = GetChildCount(), kid = mFirstChild;
n > 0;
--n, kid = kid->GetNextSibling())
{
if (!kid->IsEmpty())
return PR_FALSE;
}
return PR_TRUE;
}
void
nsLineBox::DeleteLineList(nsIPresContext* aPresContext, nsLineList& aLines)
{
if (! aLines.empty()) {
// Delete our child frames before doing anything else. In particular
// we do all of this before our base class releases it's hold on the
// view.
for (nsIFrame* child = aLines.front()->mFirstChild; child; ) {
nsIFrame* nextChild = child->GetNextSibling();
child->Destroy(aPresContext);
child = nextChild;
}
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
do {
nsLineBox* line = aLines.front();
aLines.pop_front();
line->Destroy(shell);
} while (! aLines.empty());
}
}
nsLineBox*
nsLineBox::FindLineContaining(nsLineList& aLines, nsIFrame* aFrame,
PRInt32* aFrameIndexInLine)
{
NS_PRECONDITION(aFrameIndexInLine && !aLines.empty() && aFrame, "null ptr");
for (nsLineList::iterator line = aLines.begin(),
line_end = aLines.end();
line != line_end;
++line)
{
PRInt32 ix = line->IndexOf(aFrame);
if (ix >= 0) {
*aFrameIndexInLine = ix;
return line;
}
}
*aFrameIndexInLine = -1;
return nsnull;
}
PRBool
nsLineBox::RFindLineContaining(nsIFrame* aFrame,
const nsLineList::iterator& aBegin,
nsLineList::iterator& aEnd,
PRInt32* aFrameIndexInLine)
{
NS_PRECONDITION(aFrame, "null ptr");
while (aBegin != aEnd) {
--aEnd;
PRInt32 ix = aEnd->IndexOf(aFrame);
if (ix >= 0) {
*aFrameIndexInLine = ix;
return PR_TRUE;
}
}
*aFrameIndexInLine = -1;
return PR_FALSE;
}
nsCollapsingMargin
nsLineBox::GetCarriedOutBottomMargin() const
{
NS_ASSERTION(IsBlock(),
"GetCarriedOutBottomMargin called on non-block line.");
return (IsBlock() && mBlockData)
? mBlockData->mCarriedOutBottomMargin
: nsCollapsingMargin();
}
void
nsLineBox::SetCarriedOutBottomMargin(nsCollapsingMargin aValue)
{
if (IsBlock()) {
if (! aValue.IsZero()) {
if (!mBlockData) {
mBlockData = new ExtraBlockData(mBounds);
}
if (mBlockData) {
mBlockData->mCarriedOutBottomMargin = aValue;
}
}
else if (mBlockData) {
mBlockData->mCarriedOutBottomMargin = aValue;
MaybeFreeData();
}
}
}
void
nsLineBox::MaybeFreeData()
{
if (mData && (mData->mCombinedArea == mBounds)) {
if (IsInline()) {
if (mInlineData->mFloats.IsEmpty()) {
delete mInlineData;
mInlineData = nsnull;
}
}
else if (mBlockData->mCarriedOutBottomMargin.IsZero()) {
delete mBlockData;
mBlockData = nsnull;
}
}
}
// XXX get rid of this???
nsFloatCache*
nsLineBox::GetFirstFloat()
{
NS_ABORT_IF_FALSE(IsInline(), "block line can't have floats");
return mInlineData ? mInlineData->mFloats.Head() : nsnull;
}
// XXX this might be too eager to free memory
void
nsLineBox::FreeFloats(nsFloatCacheFreeList& aFreeList)
{
NS_ABORT_IF_FALSE(IsInline(), "block line can't have floats");
if (IsInline()) {
if (mInlineData) {
aFreeList.Append(mInlineData->mFloats);
MaybeFreeData();
}
}
}
void
nsLineBox::AppendFloats(nsFloatCacheFreeList& aFreeList)
{
NS_ABORT_IF_FALSE(IsInline(), "block line can't have floats");
if (IsInline()) {
if (aFreeList.NotEmpty()) {
if (!mInlineData) {
mInlineData = new ExtraInlineData(mBounds);
}
if (mInlineData) {
mInlineData->mFloats.Append(aFreeList);
}
}
}
}
PRBool
nsLineBox::RemoveFloat(nsIFrame* aFrame)
{
NS_ABORT_IF_FALSE(IsInline(), "block line can't have floats");
if (IsInline() && mInlineData) {
nsFloatCache* fc = mInlineData->mFloats.Find(aFrame);
if (fc) {
// Note: the placeholder is part of the line's child list
// and will be removed later.
fc->mPlaceholder->SetOutOfFlowFrame(nsnull);
mInlineData->mFloats.Remove(fc);
MaybeFreeData();
return PR_TRUE;
}
}
return PR_FALSE;
}
void
nsLineBox::SetCombinedArea(const nsRect& aCombinedArea)
{
NS_ASSERTION(aCombinedArea.width >= 0, "illegal width for combined area");
NS_ASSERTION(aCombinedArea.height >= 0, "illegal height for combined area");
if (aCombinedArea != mBounds) {
if (mData) {
mData->mCombinedArea = aCombinedArea;
}
else {
if (IsInline()) {
mInlineData = new ExtraInlineData(aCombinedArea);
}
else {
mBlockData = new ExtraBlockData(aCombinedArea);
}
}
}
else {
if (mData) {
// Store away new value so that MaybeFreeData compares against
// the right value.
mData->mCombinedArea = aCombinedArea;
}
MaybeFreeData();
}
#ifdef VERY_NOISY_REFLOW
printf("nsLB::SetCombinedArea(1) %p (%d, %d, %d, %d)\n",
this, aCombinedArea.x, aCombinedArea.y, aCombinedArea.width, aCombinedArea.height);
#endif
}
void
nsLineBox::GetCombinedArea(nsRect* aResult)
{
NS_ASSERTION(aResult, "null arg");
if (aResult) {
*aResult = mData ? mData->mCombinedArea : mBounds;
#ifdef VERY_NOISY_REFLOW
printf("nsLineBox::GetCombinedArea(1) %p (%d,%d,%d,%d)\n",
this, aResult->x, aResult->y, aResult->width, aResult->height);
#endif
}
}
//----------------------------------------------------------------------
static nsLineBox* gDummyLines[1];
nsLineIterator::nsLineIterator()
{
mLines = gDummyLines;
mNumLines = 0;
mIndex = 0;
mRightToLeft = PR_FALSE;
}
nsLineIterator::~nsLineIterator()
{
if (mLines != gDummyLines) {
delete [] mLines;
}
}
NS_IMPL_ISUPPORTS2(nsLineIterator, nsILineIterator, nsILineIteratorNavigator)
nsresult
nsLineIterator::Init(nsLineList& aLines, PRBool aRightToLeft)
{
mRightToLeft = aRightToLeft;
// Count the lines
PRInt32 numLines = aLines.size();
if (0 == numLines) {
// Use gDummyLines so that we don't need null pointer checks in
// the accessor methods
mLines = gDummyLines;
return NS_OK;
}
// Make a linear array of the lines
mLines = new nsLineBox*[numLines];
if (!mLines) {
// Use gDummyLines so that we don't need null pointer checks in
// the accessor methods
mLines = gDummyLines;
return NS_ERROR_OUT_OF_MEMORY;
}
nsLineBox** lp = mLines;
for (nsLineList::iterator line = aLines.begin(), line_end = aLines.end() ;
line != line_end;
++line)
{
*lp++ = line;
}
mNumLines = numLines;
return NS_OK;
}
NS_IMETHODIMP
nsLineIterator::GetNumLines(PRInt32* aResult)
{
NS_PRECONDITION(aResult, "null OUT ptr");
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mNumLines;
return NS_OK;
}
NS_IMETHODIMP
nsLineIterator::GetDirection(PRBool* aIsRightToLeft)
{
NS_PRECONDITION(aIsRightToLeft, "null OUT ptr");
if (!aIsRightToLeft) {
return NS_ERROR_NULL_POINTER;
}
*aIsRightToLeft = mRightToLeft;
return NS_OK;
}
NS_IMETHODIMP
nsLineIterator::GetLine(PRInt32 aLineNumber,
nsIFrame** aFirstFrameOnLine,
PRInt32* aNumFramesOnLine,
nsRect& aLineBounds,
PRUint32* aLineFlags)
{
NS_ENSURE_ARG_POINTER(aFirstFrameOnLine);
NS_ENSURE_ARG_POINTER(aNumFramesOnLine);
NS_ENSURE_ARG_POINTER(aLineFlags);
if ((aLineNumber < 0) || (aLineNumber >= mNumLines)) {
*aFirstFrameOnLine = nsnull;
*aNumFramesOnLine = 0;
aLineBounds.SetRect(0, 0, 0, 0);
return NS_OK;
}
nsLineBox* line = mLines[aLineNumber];
*aFirstFrameOnLine = line->mFirstChild;
*aNumFramesOnLine = line->GetChildCount();
aLineBounds = line->mBounds;
PRUint32 flags = 0;
if (line->IsBlock()) {
flags |= NS_LINE_FLAG_IS_BLOCK;
}
else {
if (line->HasBreak())
flags |= NS_LINE_FLAG_ENDS_IN_BREAK;
}
*aLineFlags = flags;
return NS_OK;
}
NS_IMETHODIMP
nsLineIterator::FindLineContaining(nsIFrame* aFrame,
PRInt32* aLineNumberResult)
{
nsLineBox* line = mLines[0];
PRInt32 lineNumber = 0;
while (lineNumber != mNumLines) {
if (line->Contains(aFrame)) {
*aLineNumberResult = lineNumber;
return NS_OK;
}
line = mLines[++lineNumber];
}
*aLineNumberResult = -1;
return NS_OK;
}
NS_IMETHODIMP
nsLineIterator::FindLineAt(nscoord aY,
PRInt32* aLineNumberResult)
{
nsLineBox* line = mLines[0];
if (!line || (aY < line->mBounds.y)) {
*aLineNumberResult = -1;
return NS_OK;
}
PRInt32 lineNumber = 0;
while (lineNumber != mNumLines) {
if ((aY >= line->mBounds.y) && (aY < line->mBounds.YMost())) {
*aLineNumberResult = lineNumber;
return NS_OK;
}
line = mLines[++lineNumber];
}
*aLineNumberResult = mNumLines;
return NS_OK;
}
#ifdef IBMBIDI
NS_IMETHODIMP
nsLineIterator::CheckLineOrder(PRInt32 aLine,
PRBool *aIsReordered,
nsIFrame **aFirstVisual,
nsIFrame **aLastVisual)
{
PRInt32 currentLine, saveLine, testLine;
nscoord saveX;
nsIFrame *checkFrame;
nsIFrame *firstFrame;
nsIFrame *leftmostFrame;
nsIFrame *rightmostFrame;
nscoord minX, maxX;
PRInt32 lineFrameCount;
PRUint32 lineFlags;
nsresult result = NS_OK;
// an RTL paragraph is always considered as reordered
// in an LTR paragraph, find out by examining the coordinates of each frame in the line
if (mRightToLeft)
*aIsReordered = PR_TRUE;
else {
*aIsReordered = PR_FALSE;
// Check the preceding and following line, since we might be moving into them
for (currentLine = PR_MAX(0, aLine-1); currentLine < aLine+1; currentLine++) {
nsLineBox* line = mLines[currentLine];
if (!line)
break;
checkFrame = line->mFirstChild;
result = FindLineContaining(checkFrame, &saveLine);
if (NS_FAILED(result))
return result;
saveX = checkFrame->GetRect().x;
lineFrameCount = line->GetChildCount();
for (; checkFrame; checkFrame = checkFrame->GetNextSibling()) {
result = FindLineContaining(checkFrame, &testLine);
if (NS_FAILED(result))
return result;
if (testLine != saveLine) {
*aIsReordered = PR_TRUE;
break;
}
nsRect checkRect = checkFrame->GetRect();
// If the origin of any frame is less than the previous frame, the line is reordered
if (checkRect.x < saveX) {
*aIsReordered = PR_TRUE;
break;
}
saveX = checkRect.x;
lineFrameCount--;
if (0 == lineFrameCount)
break;
}
if (*aIsReordered)
break;
}
}
// If the line is reordered, identify the first and last frames on the line
if (*aIsReordered) {
nsRect nonUsedRect;
result = GetLine(aLine, &firstFrame, &lineFrameCount, nonUsedRect, &lineFlags);
if (NS_FAILED(result))
return result;
leftmostFrame = rightmostFrame = firstFrame;
maxX = minX = firstFrame->GetRect().x;
for (;lineFrameCount > 1;lineFrameCount--) {
firstFrame = firstFrame->GetNextSibling();
nsRect checkRect = firstFrame->GetRect();
if (checkRect.x > maxX) {
maxX = checkRect.x;
rightmostFrame = firstFrame;
}
if (checkRect.x < minX) {
minX = checkRect.x;
leftmostFrame = firstFrame;
}
}
if (mRightToLeft) {
*aFirstVisual = rightmostFrame;
*aLastVisual = leftmostFrame;
}
else {
*aFirstVisual = leftmostFrame;
*aLastVisual = rightmostFrame;
}
}
return result;
}
#endif // IBMBIDI
NS_IMETHODIMP
nsLineIterator::FindFrameAt(PRInt32 aLineNumber,
nscoord aX,
#ifdef IBMBIDI
PRBool aCouldBeReordered,
#endif // IBMBIDI
nsIFrame** aFrameFound,
PRBool* aXIsBeforeFirstFrame,
PRBool* aXIsAfterLastFrame)
{
NS_PRECONDITION(aFrameFound && aXIsBeforeFirstFrame && aXIsAfterLastFrame,
"null OUT ptr");
if (!aFrameFound || !aXIsBeforeFirstFrame || !aXIsAfterLastFrame) {
return NS_ERROR_NULL_POINTER;
}
if ((aLineNumber < 0) || (aLineNumber >= mNumLines)) {
return NS_ERROR_INVALID_ARG;
}
nsLineBox* line = mLines[aLineNumber];
if (!line) {
*aFrameFound = nsnull;
*aXIsBeforeFirstFrame = PR_TRUE;
*aXIsAfterLastFrame = PR_FALSE;
return NS_OK;
}
if (line->mBounds.width == 0)
return NS_ERROR_FAILURE;
nsIFrame *stoppingFrame = nsnull;
if (aX < line->mBounds.x) {
nsIFrame* frame;
if (mRightToLeft) {
frame = line->LastChild();
}
else {
frame = line->mFirstChild;
}
if (frame->GetRect().width > 0)
{
*aFrameFound = frame;
*aXIsBeforeFirstFrame = PR_TRUE;
*aXIsAfterLastFrame = PR_FALSE;
return NS_OK;
}
else if (mRightToLeft)
stoppingFrame = frame;
else
stoppingFrame = line->LastChild();
}
else if (aX >= line->mBounds.XMost()) {
nsIFrame* frame;
if (mRightToLeft) {
frame = line->mFirstChild;
}
else {
frame = line->LastChild();
}
if (frame->GetRect().width > 0)
{
*aFrameFound = frame;
*aXIsBeforeFirstFrame = PR_FALSE;
*aXIsAfterLastFrame = PR_TRUE;
return NS_OK;
}
else if (mRightToLeft)
stoppingFrame = line->mFirstChild;
else
stoppingFrame = frame;
}
// Find the frame closest to the X coordinate. Gaps can occur
// between frames (because of margins) so we split the gap in two
// when checking.
*aXIsBeforeFirstFrame = PR_FALSE;
*aXIsAfterLastFrame = PR_FALSE;
#ifdef IBMBIDI
PRBool isReordered = PR_FALSE;
nsIFrame *firstVisual, *lastVisual;
if (aCouldBeReordered)
CheckLineOrder(aLineNumber, &isReordered, &firstVisual, &lastVisual);
#endif
nsIFrame* frame = line->mFirstChild;
#ifdef IBMBIDI
if (isReordered)
frame = firstVisual;
#endif // IBMBIDI
PRInt32 n = line->GetChildCount();
if (mRightToLeft) {
while (--n >= 0) {
nsIFrame* nextFrame;
#ifdef IBMBIDI
if (!frame)
break;
if (isReordered) {
nscoord maxX, limX;
PRInt32 testLine;
nsIFrame* tempFrame;
maxX = -0x7fffffff;
limX = frame->GetRect().x;
tempFrame = line->mFirstChild;
nextFrame = nsnull;
while (tempFrame) {
if (NS_SUCCEEDED(FindLineContaining(tempFrame, &testLine))
&& testLine == aLineNumber) {
nsRect tempRect = tempFrame->GetRect();
if (tempRect.x > maxX && tempRect.x < limX) { // we are looking for the highest value less than the current one
maxX = tempRect.x;
nextFrame = tempFrame;
}
}
tempFrame = tempFrame->GetNextSibling();
}
}
else
#endif // IBMBIDI
nextFrame = frame->GetNextSibling();
nsRect r1 = frame->GetRect();
if (r1.width && aX > r1.x) {
break;
}
if (nextFrame) {
nsRect r2 = nextFrame->GetRect();
if (r2.width && aX > r2.XMost()) {
nscoord rightEdge = r2.XMost();
nscoord delta = r1.x - rightEdge;
if (!r1.width || aX < rightEdge + delta/2) {
frame = nextFrame;
}
break;
}
}
else {
*aXIsBeforeFirstFrame = PR_TRUE;
}
frame = nextFrame;
if (nextFrame == stoppingFrame)
break;
}
}
else {
while (--n >= 0) {
nsIFrame* nextFrame;
#ifdef IBMBIDI
if (!frame)
break;
if (isReordered) {
nsIFrame* tempFrame;
nscoord minX, limX;
PRInt32 testLine;
minX = 0x7fffffff;
limX = frame->GetRect().x;
tempFrame = line->mFirstChild;
nextFrame = nsnull;
while (tempFrame) {
if (NS_SUCCEEDED(FindLineContaining(tempFrame, &testLine))
&& testLine == aLineNumber) {
nsRect tempRect = tempFrame->GetRect();
if (tempRect.width && tempRect.x < minX && tempRect.x > limX) { // we are looking for the lowest value greater than the current one
minX = tempRect.x;
nextFrame = tempFrame;
}
}
tempFrame = tempFrame->GetNextSibling();
}
}
else
#endif // IBMBIDI
nextFrame = frame->GetNextSibling();
nsRect r1 = frame->GetRect();
if (r1.width && aX < r1.XMost()) {
break;
}
if (nextFrame) {
nsRect r2 = nextFrame->GetRect();
if (r2.width && aX < r2.x) {
nscoord rightEdge = r1.XMost();
nscoord delta = r2.x - rightEdge;
if (!r1.width || aX >= rightEdge + delta/2) {
frame = nextFrame;
}
break;
}
}
else {
*aXIsAfterLastFrame = PR_TRUE;
}
frame = nextFrame;
if (nextFrame == stoppingFrame)
break;
}
}
*aFrameFound = frame;
return NS_OK;
}
NS_IMETHODIMP
nsLineIterator::GetNextSiblingOnLine(nsIFrame*& aFrame, PRInt32 aLineNumber)
{
aFrame = aFrame->GetNextSibling();
return NS_OK;
}
//----------------------------------------------------------------------
nsFloatCacheList::~nsFloatCacheList()
{
nsFloatCache* fc = mHead;
while (fc) {
nsFloatCache* next = fc->mNext;
delete fc;
fc = next;
}
mHead = nsnull;
}
nsFloatCache*
nsFloatCacheList::Tail() const
{
nsFloatCache* fc = mHead;
while (fc) {
if (!fc->mNext) {
break;
}
fc = fc->mNext;
}
return fc;
}
void
nsFloatCacheList::Append(nsFloatCacheFreeList& aList)
{
nsFloatCache* tail = Tail();
if (tail) {
tail->mNext = aList.mHead;
}
else {
mHead = aList.mHead;
}
aList.mHead = nsnull;
aList.mTail = nsnull;
}
nsFloatCache*
nsFloatCacheList::Find(nsIFrame* aOutOfFlowFrame)
{
nsFloatCache* fc = mHead;
while (fc) {
if (fc->mPlaceholder->GetOutOfFlowFrame() == aOutOfFlowFrame) {
break;
}
fc = fc->Next();
}
return fc;
}
void
nsFloatCacheList::Remove(nsFloatCache* aElement)
{
nsFloatCache** fcp = &mHead;
nsFloatCache* fc;
while (nsnull != (fc = *fcp)) {
if (fc == aElement) {
*fcp = fc->mNext;
break;
}
fcp = &fc->mNext;
}
}
//----------------------------------------------------------------------
void
nsFloatCacheFreeList::Append(nsFloatCacheList& aList)
{
if (mTail) {
mTail->mNext = aList.mHead;
}
else {
mHead = aList.mHead;
}
mTail = aList.Tail();
aList.mHead = nsnull;
}
nsFloatCache*
nsFloatCacheFreeList::Alloc()
{
nsFloatCache* fc = mHead;
if (mHead) {
if (mHead == mTail) {
mHead = mTail = nsnull;
}
else {
mHead = fc->mNext;
}
fc->mNext = nsnull;
}
else {
fc = new nsFloatCache();
}
return fc;
}
void
nsFloatCacheFreeList::Append(nsFloatCache* aFloat)
{
aFloat->mNext = nsnull;
if (mTail) {
mTail->mNext = aFloat;
mTail = aFloat;
}
else {
mHead = mTail = aFloat;
}
}
//----------------------------------------------------------------------
MOZ_DECL_CTOR_COUNTER(nsFloatCache)
nsFloatCache::nsFloatCache()
: mPlaceholder(nsnull),
mIsCurrentLineFloat(PR_TRUE),
mMargins(0, 0, 0, 0),
mOffsets(0, 0, 0, 0),
mCombinedArea(0, 0, 0, 0),
mNext(nsnull)
{
MOZ_COUNT_CTOR(nsFloatCache);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsFloatCache::~nsFloatCache()
{
MOZ_COUNT_DTOR(nsFloatCache);
}
#endif
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