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gecko-dev/layout/generic/nsLineLayout.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are Copyright (C) 1998
* Netscape Communications Corporation. All Rights Reserved.
*/
#include "nsCOMPtr.h"
#include "nsLineLayout.h"
#include "nsStyleConsts.h"
#include "nsHTMLContainerFrame.h"
#include "nsHTMLIIDs.h"
#include "nsISpaceManager.h"
#include "nsIStyleContext.h"
#include "nsIPresContext.h"
#include "nsIFontMetrics.h"
#include "nsIRenderingContext.h"
#include "nsLayoutAtoms.h"
#include "nsPlaceholderFrame.h"
#include "nsIDocument.h"
#include "nsIHTMLDocument.h"
#include "nsIContent.h"
#ifdef DEBUG
#undef NOISY_HORIZONTAL_ALIGN
#undef REALLY_NOISY_HORIZONTAL_ALIGN
#undef NOISY_VERTICAL_ALIGN
#undef REALLY_NOISY_VERTICAL_ALIGN
#undef NOISY_REFLOW
#undef REALLY_NOISY_REFLOW
#undef NOISY_PUSHING
#undef REALLY_NOISY_PUSHING
#undef DEBUG_ADD_TEXT
#undef NOISY_MAX_ELEMENT_SIZE
#undef REALLY_NOISY_MAX_ELEMENT_SIZE
#undef NOISY_CAN_PLACE_FRAME
#else
#undef NOISY_HORIZONTAL_ALIGN
#undef REALLY_NOISY_HORIZONTAL_ALIGN
#undef NOISY_VERTICAL_ALIGN
#undef REALLY_NOISY_VERTICAL_ALIGN
#undef NOISY_REFLOW
#undef REALLY_NOISY_REFLOW
#undef NOISY_PUSHING
#undef REALLY_NOISY_PUSHING
#undef DEBUG_ADD_TEXT
#undef NOISY_MAX_ELEMENT_SIZE
#undef REALLY_NOISY_MAX_ELEMENT_SIZE
#undef NOISY_CAN_PLACE_FRAME
#endif
nsTextRun::nsTextRun()
{
mNext = nsnull;
}
nsTextRun::~nsTextRun()
{
}
void
nsTextRun::List(FILE* out, PRInt32 aIndent)
{
PRInt32 i;
for (i = aIndent; --i >= 0; ) fputs(" ", out);
PRInt32 n = mArray.Count();
fprintf(out, "%p: count=%d <", this, n);
for (i = 0; i < n; i++) {
nsIFrame* text = (nsIFrame*) mArray.ElementAt(i);
nsAutoString tmp;
text->GetFrameName(tmp);
fputs(tmp, out);
printf("@%p ", text);
}
fputs(">\n", out);
}
//----------------------------------------------------------------------
#define PLACED_LEFT 0x1
#define PLACED_RIGHT 0x2
nsLineLayout::nsLineLayout(nsIPresContext& aPresContext,
nsISpaceManager* aSpaceManager,
const nsHTMLReflowState* aOuterReflowState,
PRBool aComputeMaxElementSize)
: mPresContext(aPresContext),
mSpaceManager(aSpaceManager),
mBlockReflowState(aOuterReflowState),
mBlockRS(nsnull),/* XXX temporary */
mMinLineHeight(0),
mComputeMaxElementSize(aComputeMaxElementSize)
{
// Stash away some style data that we need
aOuterReflowState->frame->GetStyleData(eStyleStruct_Text,
(const nsStyleStruct*&) mStyleText);
mTextAlign = mStyleText->mTextAlign;
mLineNumber = 0;
mColumn = 0;
mEndsInWhiteSpace = PR_TRUE;
mUnderstandsWhiteSpace = PR_FALSE;
mFirstLetterStyleOK = PR_FALSE;
mIsTopOfPage = PR_FALSE;
mUpdatedBand = PR_FALSE;
mPlacedFloaters = 0;
mImpactedByFloaters = PR_FALSE;
mTotalPlacedFrames = 0;
mTopEdge = mBottomEdge = 0;
mReflowTextRuns = nsnull;
mTextRun = nsnull;
// Instead of always pre-initializing the free-lists for frames and
// spans, we do it on demand so that situations that only use a few
// frames and spans won't waste alot of time in unneeded
// initialization.
mInitialFramesFreed = mInitialSpansFreed = 0;
mFrameFreeList = nsnull;
mSpanFreeList = nsnull;
mCurrentSpan = mRootSpan = nsnull;
mSpanDepth = 0;
mTextRuns = nsnull;
mTextRunP = &mTextRuns;
mNewTextRun = nsnull;
mKnowStrictMode = PR_FALSE;
}
nsLineLayout::nsLineLayout(nsIPresContext& aPresContext)
: mPresContext(aPresContext)
{
mTextRuns = nsnull;
mTextRunP = &mTextRuns;
mNewTextRun = nsnull;
mRootSpan = nsnull;
mSpanFreeList = nsnull;
mFrameFreeList = nsnull;
}
nsLineLayout::~nsLineLayout()
{
NS_ASSERTION(nsnull == mRootSpan, "bad line-layout user");
nsTextRun::DeleteTextRuns(mTextRuns);
// Free up all of the per-span-data items that were allocated on the heap
PerSpanData* psd = mSpanFreeList;
while (nsnull != psd) {
PerSpanData* nextSpan = psd->mNextFreeSpan;
if ((psd < &mSpanDataBuf[0]) ||
(psd >= &mSpanDataBuf[NS_LINELAYOUT_NUM_SPANS])) {
delete psd;
}
psd = nextSpan;
}
// Free up all of the per-frame-data items that were allocated on the heap
PerFrameData* pfd = mFrameFreeList;
while (nsnull != pfd) {
PerFrameData* nextFrame = pfd->mNext;
if ((pfd < &mFrameDataBuf[0]) ||
(pfd >= &mFrameDataBuf[NS_LINELAYOUT_NUM_FRAMES])) {
delete pfd;
}
pfd = nextFrame;
}
}
PRBool
nsLineLayout::InStrictMode()
{
if (!mKnowStrictMode) {
mKnowStrictMode = PR_TRUE;
mInStrictMode = PR_TRUE;
// Dig up the compatabilty mode out of the underlying document, if
// we can find it.
if (mBlockReflowState->frame) {
nsCOMPtr<nsIContent> content;
mBlockReflowState->frame->GetContent(getter_AddRefs(content));
if (content) {
nsCOMPtr<nsIDocument> doc;
content->GetDocument(*getter_AddRefs(doc));
if (doc) {
nsCOMPtr<nsIHTMLDocument> hdoc(do_QueryInterface(doc));
if (hdoc) {
nsDTDMode mode;
hdoc->GetDTDMode(mode);
if (eDTDMode_NoQuirks != mode) {
mInStrictMode = PR_FALSE;
}
}
}
}
}
}
return mInStrictMode;
}
void
nsLineLayout::BeginLineReflow(nscoord aX, nscoord aY,
nscoord aWidth, nscoord aHeight,
PRBool aImpactedByFloaters,
PRBool aIsTopOfPage)
{
NS_ASSERTION(nsnull == mRootSpan, "bad linelayout user");
#ifdef DEBUG
if ((aWidth != NS_UNCONSTRAINEDSIZE) && CRAZY_WIDTH(aWidth)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": Init: bad caller: width WAS %d(0x%x)\n",
aWidth, aWidth);
aWidth = NS_UNCONSTRAINEDSIZE;
}
if ((aHeight != NS_UNCONSTRAINEDSIZE) && CRAZY_HEIGHT(aHeight)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": Init: bad caller: height WAS %d(0x%x)\n",
aHeight, aHeight);
aHeight = NS_UNCONSTRAINEDSIZE;
}
#endif
#ifdef NOISY_REFLOW
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": BeginLineReflow: %d,%d,%d,%d %s\n",
aX, aY, aWidth, aHeight,
aIsTopOfPage ? "top-of-page" : "");
#endif
#ifdef DEBUG
mSpansAllocated = mSpansFreed = mFramesAllocated = mFramesFreed = 0;
#endif
mColumn = 0;
mEndsInWhiteSpace = PR_TRUE;
mUnderstandsWhiteSpace = PR_FALSE;
mFirstLetterStyleOK = PR_FALSE;
mIsTopOfPage = aIsTopOfPage;
mUpdatedBand = PR_FALSE;
mPlacedFloaters = 0;
mImpactedByFloaters = aImpactedByFloaters;
mTotalPlacedFrames = 0;
mCanPlaceFloater = PR_TRUE;
mSpanDepth = 0;
mMaxTopBoxHeight = mMaxBottomBoxHeight = 0;
ForgetWordFrames();
PerSpanData* psd;
NewPerSpanData(&psd);
mCurrentSpan = mRootSpan = psd;
psd->mReflowState = mBlockReflowState;
psd->mLeftEdge = aX;
psd->mX = aX;
if (NS_UNCONSTRAINEDSIZE == aWidth) {
psd->mRightEdge = NS_UNCONSTRAINEDSIZE;
}
else {
psd->mRightEdge = aX + aWidth;
}
mTopEdge = aY;
if (NS_UNCONSTRAINEDSIZE == aHeight) {
mBottomEdge = NS_UNCONSTRAINEDSIZE;
}
else {
mBottomEdge = aY + aHeight;
}
switch (mStyleText->mWhiteSpace) {
case NS_STYLE_WHITESPACE_PRE:
case NS_STYLE_WHITESPACE_NOWRAP:
psd->mNoWrap = PR_TRUE;
break;
default:
psd->mNoWrap = PR_FALSE;
break;
}
psd->mDirection = mBlockReflowState->mStyleDisplay->mDirection;
psd->mChangedFrameDirection = PR_FALSE;
}
void
nsLineLayout::EndLineReflow()
{
#ifdef NOISY_REFLOW
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": EndLineReflow: width=%d\n", mRootSpan->mX - mRootSpan->mLeftEdge);
#endif
FreeSpan(mRootSpan);
mCurrentSpan = mRootSpan = nsnull;
NS_ASSERTION(mSpansAllocated == mSpansFreed, "leak");
NS_ASSERTION(mFramesAllocated == mFramesFreed, "leak");
#ifdef DEBUG_kipp
static PRInt32 maxSpansAllocated = NS_LINELAYOUT_NUM_SPANS;
static PRInt32 maxFramesAllocated = NS_LINELAYOUT_NUM_FRAMES;
if (mSpansAllocated > maxSpansAllocated) {
printf("XXX: saw a line with %d spans\n", mSpansAllocated);
maxSpansAllocated = mSpansAllocated;
}
if (mFramesAllocated > maxFramesAllocated) {
printf("XXX: saw a line with %d frames\n", mFramesAllocated);
maxFramesAllocated = mFramesAllocated;
}
#endif
}
// XXX swtich to a single mAvailLineWidth that we adjust as each frame
// on the line is placed. Each span can still have a per-span mX that
// tracks where a child frame is going in its span; they don't need a
// per-span mLeftEdge?
// XXX currently broken because it doesn't recurse through the nested
// spans that are currently open to update their right edge.
void
nsLineLayout::UpdateBand(nscoord aX, nscoord aY,
nscoord aWidth, nscoord aHeight,
PRBool aPlacedLeftFloater)
{
PerSpanData* psd = mRootSpan;
NS_PRECONDITION(psd->mX == psd->mLeftEdge, "update-band called late");
#ifdef DEBUG
if ((aWidth != NS_UNCONSTRAINEDSIZE) && CRAZY_WIDTH(aWidth)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": UpdateBand: bad caller: width WAS %d(0x%x)\n",
aWidth, aWidth);
aWidth = NS_UNCONSTRAINEDSIZE;
}
if ((aHeight != NS_UNCONSTRAINEDSIZE) && CRAZY_HEIGHT(aHeight)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": UpdateBand: bad caller: height WAS %d(0x%x)\n",
aHeight, aHeight);
aHeight = NS_UNCONSTRAINEDSIZE;
}
#endif
// Compute the difference between last times width and the new width
nscoord deltaWidth = 0;
if (NS_UNCONSTRAINEDSIZE != psd->mRightEdge) {
NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aWidth, "switched constraints");
nscoord oldWidth = psd->mRightEdge - psd->mLeftEdge;
deltaWidth = aWidth - oldWidth;
}
#ifdef NOISY_REFLOW
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": UpdateBand: %d,%d,%d,%d deltaWidth=%d %s floater\n",
aX, aY, aWidth, aHeight, deltaWidth,
aPlacedLeftFloater ? "left" : "right");
#endif
psd->mLeftEdge = aX;
psd->mX = aX;
if (NS_UNCONSTRAINEDSIZE == aWidth) {
psd->mRightEdge = NS_UNCONSTRAINEDSIZE;
}
else {
psd->mRightEdge = aX + aWidth;
}
mTopEdge = aY;
if (NS_UNCONSTRAINEDSIZE == aHeight) {
mBottomEdge = NS_UNCONSTRAINEDSIZE;
}
else {
mBottomEdge = aY + aHeight;
}
mUpdatedBand = PR_TRUE;
mPlacedFloaters |= (aPlacedLeftFloater ? PLACED_LEFT : PLACED_RIGHT);
mImpactedByFloaters = PR_TRUE;
// Now update all of the open spans...
psd = mCurrentSpan;
while (psd != mRootSpan) {
NS_ASSERTION(nsnull != psd, "null ptr");
if (nsnull == psd) {
break;
}
NS_ASSERTION(psd->mX == psd->mLeftEdge, "bad floater placement");
if (NS_UNCONSTRAINEDSIZE == aWidth) {
psd->mRightEdge = NS_UNCONSTRAINEDSIZE;
}
else {
psd->mRightEdge += deltaWidth;
}
#ifdef NOISY_REFLOW
printf(" span %p: oldRightEdge=%d newRightEdge=%d\n",
psd->mRightEdge - deltaWidth, psd->mRightEdge);
#endif
psd = psd->mParent;
}
}
// Note: Only adjust the outermost frames (the ones that are direct
// children of the block), not the ones in the child spans. The reason
// is simple: the frames in the spans have coordinates local to their
// parent therefore they are moved when their parent span is moved.
void
nsLineLayout::UpdateFrames()
{
NS_ASSERTION(nsnull != mRootSpan, "UpdateFrames with no active spans");
PerSpanData* psd = mRootSpan;
if (NS_STYLE_DIRECTION_LTR == psd->mDirection) {
if (PLACED_LEFT & mPlacedFloaters) {
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
pfd->mBounds.x = psd->mX;
pfd = pfd->mNext;
}
}
}
else if (PLACED_RIGHT & mPlacedFloaters) {
// XXX handle DIR=right-to-left
}
}
nsresult
nsLineLayout::NewPerSpanData(PerSpanData** aResult)
{
PerSpanData* psd = mSpanFreeList;
if (nsnull == psd) {
if (mInitialSpansFreed < NS_LINELAYOUT_NUM_SPANS) {
// use one of the ones defined in our struct...
psd = &mSpanDataBuf[mInitialSpansFreed++];
}
else {
psd = new PerSpanData;
if (nsnull == psd) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
}
else {
mSpanFreeList = psd->mNextFreeSpan;
}
psd->mParent = nsnull;
psd->mFrame = nsnull;
psd->mFirstFrame = nsnull;
psd->mLastFrame = nsnull;
#ifdef DEBUG
mSpansAllocated++;
#endif
*aResult = psd;
return NS_OK;
}
nsresult
nsLineLayout::BeginSpan(nsIFrame* aFrame,
const nsHTMLReflowState* aSpanReflowState,
nscoord aLeftEdge,
nscoord aRightEdge)
{
#ifdef NOISY_REFLOW
nsFrame::IndentBy(stdout, mSpanDepth+1);
nsFrame::ListTag(stdout, aFrame);
printf(": BeginSpan leftEdge=%d rightEdge=%d\n", aLeftEdge, aRightEdge);
#endif
PerSpanData* psd;
nsresult rv = NewPerSpanData(&psd);
if (NS_SUCCEEDED(rv)) {
// Link up span frame's pfd to point to its child span data
PerFrameData* pfd = mCurrentSpan->mLastFrame;
NS_ASSERTION(pfd->mFrame == aFrame, "huh?");
pfd->mSpan = psd;
// Init new span
psd->mFrame = pfd;
psd->mParent = mCurrentSpan;
psd->mReflowState = aSpanReflowState;
psd->mLeftEdge = aLeftEdge;
psd->mX = aLeftEdge;
psd->mRightEdge = aRightEdge;
const nsStyleText* styleText;
aSpanReflowState->frame->GetStyleData(eStyleStruct_Text,
(const nsStyleStruct*&) styleText);
switch (styleText->mWhiteSpace) {
case NS_STYLE_WHITESPACE_PRE:
case NS_STYLE_WHITESPACE_NOWRAP:
psd->mNoWrap = PR_TRUE;
break;
default:
psd->mNoWrap = PR_FALSE;
break;
}
psd->mDirection = aSpanReflowState->mStyleDisplay->mDirection;
psd->mChangedFrameDirection = PR_FALSE;
// Switch to new span
mCurrentSpan = psd;
mSpanDepth++;
}
return rv;
}
void
nsLineLayout::EndSpan(nsIFrame* aFrame,
nsSize& aSizeResult,
nsSize* aMaxElementSize,
PRBool* aHaveAtLeastOneNonEmptyTextFrame)
{
NS_ASSERTION(mSpanDepth > 0, "end-span without begin-span");
#ifdef NOISY_REFLOW
nsFrame::IndentBy(stdout, mSpanDepth);
nsFrame::ListTag(stdout, aFrame);
printf(": EndSpan width=%d\n", mCurrentSpan->mX - mCurrentSpan->mLeftEdge);
#endif
PerSpanData* psd = mCurrentSpan;
nscoord width = 0;
nscoord maxHeight = 0;
nscoord maxElementWidth = 0;
nscoord maxElementHeight = 0;
PRBool haveAtLeastOneNonEmptyTextFrame = PR_FALSE;
if (nsnull != psd->mLastFrame) {
width = psd->mX - psd->mLeftEdge;
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
if (pfd->mBounds.height > maxHeight) maxHeight = pfd->mBounds.height;
if (pfd->mIsNonEmptyTextFrame) haveAtLeastOneNonEmptyTextFrame = PR_TRUE;
// Compute max-element-size if necessary
if (aMaxElementSize) {
nscoord mw = pfd->mMaxElementSize.width +
pfd->mMargin.left + pfd->mMargin.right;
if (maxElementWidth < mw) {
maxElementWidth = mw;
}
nscoord mh = pfd->mMaxElementSize.height +
pfd->mMargin.top + pfd->mMargin.bottom;
if (maxElementHeight < mh) {
maxElementHeight = mh;
}
}
pfd = pfd->mNext;
}
}
aSizeResult.width = width;
aSizeResult.height = maxHeight;
if (aMaxElementSize) {
if (psd->mNoWrap) {
// When we have a non-breakable span, it's max-element-size
// width is its entire width.
aMaxElementSize->width = width;
aMaxElementSize->height = maxHeight;
}
else {
aMaxElementSize->width = maxElementWidth;
aMaxElementSize->height = maxElementHeight;
}
}
if (aHaveAtLeastOneNonEmptyTextFrame) {
*aHaveAtLeastOneNonEmptyTextFrame = haveAtLeastOneNonEmptyTextFrame;
}
mSpanDepth--;
mCurrentSpan->mReflowState = nsnull; // no longer valid so null it out!
mCurrentSpan = mCurrentSpan->mParent;
}
PRInt32
nsLineLayout::GetCurrentSpanCount() const
{
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
PRInt32 count = 0;
PerFrameData* pfd = mRootSpan->mFirstFrame;
while (nsnull != pfd) {
count++;
pfd = pfd->mNext;
}
return count;
}
void
nsLineLayout::SplitLineTo(PRInt32 aNewCount)
{
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
#ifdef REALLY_NOISY_PUSHING
printf("SplitLineTo %d (current count=%d); before:\n", aNewCount,
GetCurrentSpanCount());
DumpPerSpanData(mRootSpan, 1);
#endif
PerSpanData* psd = mRootSpan;
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
if (--aNewCount == 0) {
// Truncate list at pfd (we keep pfd, but anything following is freed)
PerFrameData* next = pfd->mNext;
pfd->mNext = nsnull;
psd->mLastFrame = pfd;
// Now release all of the frames following pfd
pfd = next;
while (nsnull != pfd) {
next = pfd->mNext;
pfd->mNext = mFrameFreeList;
mFrameFreeList = pfd;
#ifdef DEBUG
mFramesFreed++;
#endif
if (nsnull != pfd->mSpan) {
FreeSpan(pfd->mSpan);
}
pfd = next;
}
break;
}
pfd = pfd->mNext;
}
#ifdef NOISY_PUSHING
printf("SplitLineTo %d (current count=%d); after:\n", aNewCount,
GetCurrentSpanCount());
DumpPerSpanData(mRootSpan, 1);
#endif
}
void
nsLineLayout::PushFrame(nsIFrame* aFrame)
{
PerSpanData* psd = mCurrentSpan;
NS_ASSERTION(psd->mLastFrame->mFrame == aFrame, "pushing non-last frame");
#ifdef REALLY_NOISY_PUSHING
nsFrame::IndentBy(stdout, mSpanDepth);
printf("PushFrame %p, before:\n", psd);
DumpPerSpanData(psd, 1);
#endif
// Take the last frame off of the span's frame list
PerFrameData* pfd = psd->mLastFrame;
if (pfd == psd->mFirstFrame) {
// We are pushing away the only frame...empty the list
psd->mFirstFrame = nsnull;
psd->mLastFrame = nsnull;
}
else {
PerFrameData* prevFrame = pfd->mPrev;
prevFrame->mNext = nsnull;
psd->mLastFrame = prevFrame;
}
// Now free it, and if it has a span, free that too
pfd->mNext = mFrameFreeList;
mFrameFreeList = pfd;
#ifdef DEBUG
mFramesFreed++;
#endif
if (nsnull != pfd->mSpan) {
FreeSpan(pfd->mSpan);
}
#ifdef NOISY_PUSHING
nsFrame::IndentBy(stdout, mSpanDepth);
printf("PushFrame: %p after:\n", psd);
DumpPerSpanData(psd, 1);
#endif
}
void
nsLineLayout::FreeSpan(PerSpanData* psd)
{
// Free its frames
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
if (nsnull != pfd->mSpan) {
FreeSpan(pfd->mSpan);
}
PerFrameData* next = pfd->mNext;
pfd->mNext = mFrameFreeList;
mFrameFreeList = pfd;
#ifdef DEBUG
mFramesFreed++;
#endif
pfd = next;
}
// Now put the span on the free list since its free too
psd->mNextFreeSpan = mSpanFreeList;
mSpanFreeList = psd;
#ifdef DEBUG
mSpansFreed++;
#endif
}
PRBool
nsLineLayout::IsZeroHeight()
{
PerSpanData* psd = mCurrentSpan;
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
if (0 != pfd->mBounds.height) {
return PR_FALSE;
}
pfd = pfd->mNext;
}
return PR_TRUE;
}
nsresult
nsLineLayout::NewPerFrameData(PerFrameData** aResult)
{
PerFrameData* pfd = mFrameFreeList;
if (nsnull == pfd) {
if (mInitialFramesFreed < NS_LINELAYOUT_NUM_FRAMES) {
// use one of the ones defined in our struct...
pfd = &mFrameDataBuf[mInitialFramesFreed++];
}
else {
pfd = new PerFrameData;
if (nsnull == pfd) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
}
else {
mFrameFreeList = pfd->mNext;
}
pfd->mSpan = nsnull;
pfd->mNext = nsnull;
#ifdef DEBUG
pfd->mVerticalAlign = 0xFF;
pfd->mRelativePos = PRBool(0xFF);
mFramesAllocated++;
#endif
*aResult = pfd;
return NS_OK;
}
PRBool
nsLineLayout::CanPlaceFloaterNow() const
{
return mCanPlaceFloater;
}
PRBool
nsLineLayout::LineIsEmpty() const
{
return 0 == mTotalPlacedFrames;
}
PRBool
nsLineLayout::LineIsBreakable() const
{
if ((0 != mTotalPlacedFrames) || mImpactedByFloaters) {
return PR_TRUE;
}
return PR_FALSE;
}
nsresult
nsLineLayout::ReflowFrame(nsIFrame* aFrame,
nsIFrame** aNextRCFrame,
nsReflowStatus& aReflowStatus)
{
PerFrameData* pfd;
nsresult rv = NewPerFrameData(&pfd);
if (NS_FAILED(rv)) {
return rv;
}
PerSpanData* psd = mCurrentSpan;
psd->AppendFrame(pfd);
#ifdef REALLY_NOISY_REFLOW
nsFrame::IndentBy(stdout, mSpanDepth);
printf("%p: Begin ReflowFrame pfd=%p ", psd, pfd);
nsFrame::ListTag(stdout, aFrame);
printf("\n");
#endif
// Compute the available size for the frame. This available width
// includes room for the side margins and for the text-indent.
nsSize availSize;
if (NS_UNCONSTRAINEDSIZE == psd->mRightEdge) {
availSize.width = NS_UNCONSTRAINEDSIZE;
}
else {
availSize.width = psd->mRightEdge - psd->mX;
if (psd->mNoWrap) {
// Make up a width to use for reflowing into. XXX what value to
// use? for tables, we want to limit it; for other elements
// (e.g. text) it can be unlimited...
availSize.width = psd->mReflowState->availableWidth;
}
}
if (NS_UNCONSTRAINEDSIZE == mBottomEdge) {
availSize.height = NS_UNCONSTRAINEDSIZE;
}
else {
availSize.height = mBottomEdge - mTopEdge;
}
// Get reflow reason set correctly. It's possible that a child was
// created and then it was decided that it could not be reflowed
// (for example, a block frame that isn't at the start of a
// line). In this case the reason will be wrong so we need to check
// the frame state.
nsReflowReason reason = eReflowReason_Resize;
nsFrameState state;
aFrame->GetFrameState(&state);
if (NS_FRAME_FIRST_REFLOW & state) {
reason = eReflowReason_Initial;
}
else if (*aNextRCFrame == aFrame) {
reason = eReflowReason_Incremental;
// Make sure we only incrementally reflow once
*aNextRCFrame = nsnull;
}
// Setup reflow state for reflowing the frame
nsHTMLReflowState reflowState(mPresContext, *psd->mReflowState, aFrame,
availSize, reason);
reflowState.mLineLayout = this;
reflowState.isTopOfPage = mIsTopOfPage;
mUnderstandsWhiteSpace = PR_FALSE;
// Stash copies of some of the computed state away for later
// (vertical alignment, for example)
pfd->mFrame = aFrame;
pfd->mMargin = reflowState.mComputedMargin;
pfd->mBorderPadding = reflowState.mComputedBorderPadding;
pfd->mFrameType = reflowState.mFrameType;
pfd->mRelativePos =
reflowState.mStylePosition->mPosition == NS_STYLE_POSITION_RELATIVE;
if (pfd->mRelativePos) {
pfd->mOffsets = reflowState.mComputedOffsets;
}
// We want to guarantee that we always make progress when
// formatting. Therefore, if the object being placed on the line is
// too big for the line, but it is the only thing on the line
// (including counting floaters) then we go ahead and place it
// anyway. Its also true that if the object is a part of a larger
// object (a multiple frame word) then we will place it on the line
// too.
//
// Capture this state *before* we reflow the frame in case it clears
// the state out. We need to know how to treat the current frame
// when breaking.
PRBool notSafeToBreak = CanPlaceFloaterNow() || InWord();
// Apply left margins (as appropriate) to the frame computing the
// new starting x,y coordinates for the frame.
ApplyLeftMargin(pfd, reflowState);
// Let frame know that are reflowing it
nscoord x = pfd->mBounds.x;
nscoord y = pfd->mBounds.y;
nsIHTMLReflow* htmlReflow;
aFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow);
htmlReflow->WillReflow(mPresContext);
// Adjust spacemanager coordinate system for the frame. The
// spacemanager coordinates are <b>inside</b> the current spans
// border+padding, but the x/y coordinates are not (recall that
// frame coordinates are relative to the parents origin and that the
// parents border/padding is <b>inside</b> the parent
// frame. Therefore we have to subtract out the parents
// border+padding before translating.
nsSize innerMaxElementSize;
nsHTMLReflowMetrics metrics(mComputeMaxElementSize
? &innerMaxElementSize
: nsnull);
#ifdef DEBUG
metrics.width = nscoord(0xdeadbeef);
metrics.height = nscoord(0xdeadbeef);
metrics.ascent = nscoord(0xdeadbeef);
metrics.descent = nscoord(0xdeadbeef);
if (mComputeMaxElementSize) {
metrics.maxElementSize->width = nscoord(0xdeadbeef);
metrics.maxElementSize->height = nscoord(0xdeadbeef);
}
#endif
nscoord tx = x - psd->mReflowState->mComputedBorderPadding.left;
nscoord ty = y - psd->mReflowState->mComputedBorderPadding.top;
mSpaceManager->Translate(tx, ty);
htmlReflow->Reflow(mPresContext, metrics, reflowState, aReflowStatus);
// XXX See if the frame is a placeholderFrame and if it is process
// the floater.
nsIAtom* frameType;
aFrame->GetFrameType(&frameType);
pfd->mIsNonEmptyTextFrame = 0;
if (frameType) {
if (frameType == nsLayoutAtoms::placeholderFrame) {
nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)aFrame)->GetOutOfFlowFrame();
if (outOfFlowFrame) {
const nsStylePosition* position;
// Make sure it's floated and not absolutely positioned
outOfFlowFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)position);
if (!position->IsAbsolutelyPositioned()) {
if (eReflowReason_Incremental == reason) {
InitFloater((nsPlaceholderFrame*)aFrame);
}
else {
AddFloater((nsPlaceholderFrame*)aFrame);
}
nsIAtom* oofft;
outOfFlowFrame->GetFrameType(&oofft);
if (oofft) {
if (oofft == nsLayoutAtoms::letterFrame) {
mFirstLetterStyleOK = PR_FALSE;
}
NS_RELEASE(oofft);
}
}
}
}
else if (frameType == nsLayoutAtoms::textFrame) {
// Note non-empty text-frames for inline frame compatability hackery
if (metrics.width) {
pfd->mIsNonEmptyTextFrame = PR_TRUE;
}
}
NS_RELEASE(frameType);
}
mSpaceManager->Translate(-tx, -ty);
#ifdef DEBUG
// Note: break-before means ignore the reflow metrics since the
// frame will be reflowed another time.
if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
if (CRAZY_WIDTH(metrics.width) || CRAZY_HEIGHT(metrics.height)) {
printf("nsLineLayout: ");
nsFrame::ListTag(stdout, aFrame);
printf(" metrics=%d,%d!\n", metrics.width, metrics.height);
}
if (mComputeMaxElementSize &&
((nscoord(0xdeadbeef) == metrics.maxElementSize->width) ||
(nscoord(0xdeadbeef) == metrics.maxElementSize->height))) {
printf("nsLineLayout: ");
nsFrame::ListTag(stdout, aFrame);
printf(" didn't set max-element-size!\n");
metrics.maxElementSize->width = 0;
metrics.maxElementSize->height = 0;
}
#ifdef REALLY_NOISY_MAX_ELEMENT_SIZE
// Note: there are common reflow situations where this *correctly*
// occurs; so only enable this debug noise when you really need to
// analyze in detail.
if (mComputeMaxElementSize &&
((metrics.maxElementSize->width > metrics.width) ||
(metrics.maxElementSize->height > metrics.height))) {
printf("nsLineLayout: ");
nsFrame::ListTag(stdout, aFrame);
printf(": WARNING: maxElementSize=%d,%d > metrics=%d,%d\n",
metrics.maxElementSize->width,
metrics.maxElementSize->height,
metrics.width, metrics.height);
}
#endif
if ((metrics.width == nscoord(0xdeadbeef)) ||
(metrics.height == nscoord(0xdeadbeef)) ||
(metrics.ascent == nscoord(0xdeadbeef)) ||
(metrics.descent == nscoord(0xdeadbeef))) {
printf("nsLineLayout: ");
nsFrame::ListTag(stdout, aFrame);
printf(" didn't set whad %d,%d,%d,%d!\n", metrics.width, metrics.height,
metrics.ascent, metrics.descent);
}
}
#endif
#ifdef NOISY_MAX_ELEMENT_SIZE
if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
if (mComputeMaxElementSize) {
printf(" ");
nsFrame::ListTag(stdout, aFrame);
printf(": maxElementSize=%d,%d wh=%d,%d,\n",
metrics.maxElementSize->width,
metrics.maxElementSize->height,
metrics.width, metrics.height);
}
}
#endif
aFrame->GetFrameState(&state);
if (NS_FRAME_OUTSIDE_CHILDREN & state) {
pfd->mCombinedArea = metrics.mCombinedArea;
}
else {
pfd->mCombinedArea.x = 0;
pfd->mCombinedArea.y = 0;
pfd->mCombinedArea.width = metrics.width;
pfd->mCombinedArea.height = metrics.height;
}
pfd->mBounds.width = metrics.width;
pfd->mBounds.height = metrics.height;
if (mComputeMaxElementSize) {
pfd->mMaxElementSize = *metrics.maxElementSize;
}
// Now that frame has been reflowed at least one time make sure that
// the NS_FRAME_FIRST_REFLOW bit is cleared so that never give it an
// initial reflow reason again.
if (eReflowReason_Initial == reason) {
aFrame->GetFrameState(&state);
aFrame->SetFrameState(state & ~NS_FRAME_FIRST_REFLOW);
}
if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
// If frame is complete and has a next-in-flow, we need to delete
// them now. Do not do this when a break-before is signaled because
// the frame is going to get reflowed again (and may end up wanting
// a next-in-flow where it ends up).
if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
nsIFrame* kidNextInFlow;
aFrame->GetNextInFlow(&kidNextInFlow);
if (nsnull != kidNextInFlow) {
// Remove all of the childs next-in-flows. Make sure that we ask
// the right parent to do the removal (it's possible that the
// parent is not this because we are executing pullup code)
nsHTMLContainerFrame* parent;
aFrame->GetParent((nsIFrame**) &parent);
parent->DeleteChildsNextInFlow(mPresContext, aFrame);
}
}
// See if we can place the frame. If we can't fit it, then we
// return now.
if (CanPlaceFrame(pfd, reflowState, notSafeToBreak, metrics,
aReflowStatus)) {
// Place the frame, updating aBounds with the final size and
// location. Then apply the bottom+right margins (as
// appropriate) to the frame.
PlaceFrame(pfd, metrics);
PerSpanData* span = pfd->mSpan;
if (span) {
// The frame we just finished reflowing is an inline
// container. It needs its child frames vertically aligned,
// so do most of it now.
VerticalAlignFrames(span);
}
}
else {
PushFrame(aFrame);
}
}
else {
PushFrame(aFrame);
}
#ifdef REALLY_NOISY_REFLOW
nsFrame::IndentBy(stdout, mSpanDepth);
printf("End ReflowFrame ");
nsFrame::ListTag(stdout, aFrame);
printf(" status=%x\n", aReflowStatus);
#endif
return rv;
}
void
nsLineLayout::ApplyLeftMargin(PerFrameData* pfd,
nsHTMLReflowState& aReflowState)
{
// If this is the first frame in the block, and its the first line
// of a block then see if the text-indent property amounts to
// anything.
nscoord indent = 0;
if (InBlockContext() && (0 == mLineNumber) && CanPlaceFloaterNow()) {
nsStyleUnit unit = mStyleText->mTextIndent.GetUnit();
if (eStyleUnit_Coord == unit) {
indent = mStyleText->mTextIndent.GetCoordValue();
}
else if (eStyleUnit_Percent == unit) {
nscoord width =
nsHTMLReflowState::GetContainingBlockContentWidth(mBlockReflowState->parentReflowState);
if (0 != width) {
indent = nscoord(mStyleText->mTextIndent.GetPercentValue() * width);
}
}
}
// Adjust available width to account for the indent and the margins
aReflowState.availableWidth -= indent + pfd->mMargin.left +
pfd->mMargin.right;
// NOTE: While the x coordinate remains relative to the parent span,
// the y coordinate is fixed at the top edge for the line. During
// VerticalAlignFrames we will repair this so that the y coordinate
// is properly set and relative to the appropriate span.
PerSpanData* psd = mCurrentSpan;
pfd->mBounds.x = psd->mX + indent;
pfd->mBounds.y = mTopEdge;
// Compute left margin
nsIFrame* prevInFlow;
switch (aReflowState.mStyleDisplay->mFloats) {
default:
NS_NOTYETIMPLEMENTED("Unsupported floater type");
// FALL THROUGH
case NS_STYLE_FLOAT_LEFT:
case NS_STYLE_FLOAT_RIGHT:
// When something is floated, its margins are applied there
// not here.
break;
case NS_STYLE_FLOAT_NONE:
// Only apply left-margin on the first-in flow for inline frames
pfd->mFrame->GetPrevInFlow(&prevInFlow);
if (nsnull != prevInFlow) {
// Zero this out so that when we compute the max-element-size
// of the frame we will properly avoid adding in the left
// margin.
pfd->mMargin.left = 0;
}
pfd->mBounds.x += pfd->mMargin.left;
break;
}
}
/**
* See if the frame can be placed now that we know it's desired size.
* We can always place the frame if the line is empty. Note that we
* know that the reflow-status is not a break-before because if it was
* ReflowFrame above would have returned false, preventing this method
* from being called. The logic in this method assumes that.
*
* Note that there is no check against the Y coordinate because we
* assume that the caller will take care of that.
*/
PRBool
nsLineLayout::CanPlaceFrame(PerFrameData* pfd,
const nsHTMLReflowState& aReflowState,
PRBool aNotSafeToBreak,
nsHTMLReflowMetrics& aMetrics,
nsReflowStatus& aStatus)
{
// Compute right margin to use
nscoord rightMargin = 0;
if (0 != pfd->mBounds.width) {
switch (aReflowState.mStyleDisplay->mFloats) {
default:
NS_NOTYETIMPLEMENTED("Unsupported floater type");
// FALL THROUGH
case NS_STYLE_FLOAT_LEFT:
case NS_STYLE_FLOAT_RIGHT:
// When something is floated, its margins are applied there
// not here.
break;
case NS_STYLE_FLOAT_NONE:
// Only apply right margin for the last-in-flow
if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
// Zero this out so that when we compute the
// max-element-size of the frame we will properly avoid
// adding in the right margin.
pfd->mMargin.right = 0;
}
rightMargin = pfd->mMargin.right;
break;
}
}
pfd->mMargin.right = rightMargin;
PerSpanData* psd = mCurrentSpan;
if (psd->mNoWrap) {
// When wrapping is off, everything fits
return PR_TRUE;
}
#ifdef NOISY_CAN_PLACE_FRAME
if (nsnull != psd->mFrame) {
nsFrame::ListTag(stdout, psd->mFrame->mFrame);
}
else {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
}
printf(": aNotSafeToBreak=%s frame=", aNotSafeToBreak ? "true" : "false");
nsFrame::ListTag(stdout, pfd->mFrame);
printf(" frameWidth=%d\n", pfd->mBounds.XMost() + rightMargin - psd->mX);
#endif
// Set outside to PR_TRUE if the result of the reflow leads to the
// frame sticking outside of our available area.
PRBool outside = pfd->mBounds.XMost() + rightMargin > psd->mRightEdge;
if (!outside) {
// If it fits, it fits
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> inside\n");
#endif
return PR_TRUE;
}
// When it doesn't fit, check for a few special conditions where we
// allow it to fit anyway.
if (0 == pfd->mMargin.left + pfd->mBounds.width + rightMargin) {
// Empty frames always fit right where they are
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> empty frame fits\n");
#endif
return PR_TRUE;
}
if (aNotSafeToBreak) {
// There are no frames on the line or we are in the first word on
// the line. If the line isn't impacted by a floater then the
// current frame fits.
if (!mImpactedByFloaters) {
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> not-safe and not-impacted fits: ");
PerSpanData* psd = mCurrentSpan;
while (nsnull != psd) {
printf("<psd=%p x=%d left=%d> ", psd, psd->mX, psd->mLeftEdge);
psd = psd->mParent;
}
printf("\n");
#endif
return PR_TRUE;
}
}
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> didn't fit\n");
#endif
aStatus = NS_INLINE_LINE_BREAK_BEFORE();
return PR_FALSE;
}
/**
* Place the frame. Update running counters.
*/
void
nsLineLayout::PlaceFrame(PerFrameData* pfd, nsHTMLReflowMetrics& aMetrics)
{
// If frame is zero width then do not apply its left and right margins.
PerSpanData* psd = mCurrentSpan;
PRBool emptyFrame = PR_FALSE;
if ((0 == pfd->mBounds.width) && (0 == pfd->mBounds.height)) {
pfd->mBounds.x = psd->mX;
pfd->mBounds.y = mTopEdge;
emptyFrame = PR_TRUE;
}
// Record ascent and update max-ascent and max-descent values
pfd->mAscent = aMetrics.ascent;
pfd->mDescent = aMetrics.descent;
//XXX mCarriedOutTopMargin = aMetrics.mCarriedOutTopMargin;
mCarriedOutBottomMargin = aMetrics.mCarriedOutBottomMargin;
// If the band was updated during the reflow of that frame then we
// need to adjust any prior frames that were reflowed.
if (mUpdatedBand && InBlockContext()) {
UpdateFrames();
mUpdatedBand = PR_FALSE;
}
// Advance to next X coordinate
psd->mX = pfd->mBounds.XMost() + pfd->mMargin.right;
// If the frame is a not aware of white-space and it takes up some
// width, disable leading white-space compression for the next frame
// to be reflowed.
if (!mUnderstandsWhiteSpace && pfd->mBounds.width) {
mEndsInWhiteSpace = PR_FALSE;
}
// Count the number of frames on the line...
mTotalPlacedFrames++;
if (psd->mX != psd->mLeftEdge) {
// As soon as a frame placed on the line advances an X coordinate
// of any span we can no longer place a floater on the line.
mCanPlaceFloater = PR_FALSE;
}
}
nsresult
nsLineLayout::AddBulletFrame(nsIFrame* aFrame,
const nsHTMLReflowMetrics& aMetrics)
{
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
PerFrameData* pfd;
nsresult rv = NewPerFrameData(&pfd);
if (NS_SUCCEEDED(rv)) {
mRootSpan->AppendFrame(pfd);
pfd->mFrame = aFrame;
pfd->mMargin.SizeTo(0, 0, 0, 0);
pfd->mBorderPadding.SizeTo(0, 0, 0, 0);
pfd->mFrameType = NS_CSS_FRAME_TYPE_INLINE|NS_FRAME_REPLACED_ELEMENT;
pfd->mRelativePos = PR_FALSE;
pfd->mAscent = aMetrics.ascent;
pfd->mDescent = aMetrics.descent;
// Note: y value will be updated during vertical alignment
aFrame->GetRect(pfd->mBounds);
pfd->mCombinedArea = aMetrics.mCombinedArea;
if (mComputeMaxElementSize) {
pfd->mMaxElementSize.SizeTo(aMetrics.width, aMetrics.height);
}
}
return rv;
}
#ifdef DEBUG
void
nsLineLayout::DumpPerSpanData(PerSpanData* psd, PRInt32 aIndent)
{
nsFrame::IndentBy(stdout, aIndent);
printf("%p: left=%d x=%d right=%d\n", psd, psd->mLeftEdge,
psd->mX, psd->mRightEdge);
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
nsFrame::IndentBy(stdout, aIndent+1);
nsFrame::ListTag(stdout, pfd->mFrame);
printf(" %d,%d,%d,%d\n", pfd->mBounds.x, pfd->mBounds.y,
pfd->mBounds.width, pfd->mBounds.height);
if (pfd->mSpan) {
DumpPerSpanData(pfd->mSpan, aIndent + 1);
}
pfd = pfd->mNext;
}
}
#endif
#define VALIGN_OTHER 0
#define VALIGN_TOP 1
#define VALIGN_BOTTOM 2
void
nsLineLayout::VerticalAlignFrames(nsRect& aLineBoxResult,
nsSize& aMaxElementSizeResult)
{
// Synthesize a PerFrameData for the block frame
PerFrameData rootPFD;
rootPFD.mFrame = mBlockReflowState->frame;
rootPFD.mFrameType = mBlockReflowState->mFrameType;
rootPFD.mAscent = 0;
rootPFD.mDescent = 0;
mRootSpan->mFrame = &rootPFD;
// Partially place the children of the block frame. The baseline for
// this operation is set to zero so that the y coordinates for all
// of the placed children will be relative to there.
PerSpanData* psd = mRootSpan;
VerticalAlignFrames(psd);
// Compute the line-height. The line-height will be the larger of:
//
// [1] maxY - minY (the distance between the highest childs top edge
// and the lowest childs bottom edge)
//
// [2] the maximum logical box height (since not every frame may have
// participated in #1; for example: top/bottom aligned frames)
//
// [3] the minimum line height (line-height property set on the
// block frame)
nscoord lineHeight = psd->mMaxY - psd->mMinY;
// Now that the line-height is computed, we need to know where the
// baseline is in the line. Position baseline so that mMinY is just
// inside the top of the line box.
nscoord baselineY;
if (psd->mMinY < 0) {
baselineY = mTopEdge - psd->mMinY;
}
else {
baselineY = mTopEdge;
}
// It's possible that the line-height isn't tall enough because of
// the blocks minimum line-height.
if (0 != lineHeight) {
// If line contains nothing but empty boxes that have no height
// then don't apply the min-line-height.
//
// Note: This is how we hide lines that contain nothing but
// compressed whitespace.
if (lineHeight < mMinLineHeight) {
// Apply half of the extra space to the top of the line as top
// leading
nscoord extra = mMinLineHeight - lineHeight;
baselineY += extra / 2;
lineHeight = mMinLineHeight;
}
}
// It's also possible that the line-height isn't tall enough because
// of top/bottom aligned elements that were not accounted for in
// min/max Y.
//
// The CSS2 spec doesn't really say what happens when to the
// baseline in this situations. What we do is if the largest top
// aligned box height is greater than the line-height then we leave
// the baseline alone. If the largest bottom aligned box is greater
// than the line-height then we slide the baseline down by the extra
// amount.
//
// Navigator 4 gives precedence to the first top/bottom aligned
// object. We just let bottom aligned objects win.
if (lineHeight < mMaxBottomBoxHeight) {
// When the line is shorter than the maximum top aligned box
nscoord extra = mMaxBottomBoxHeight - lineHeight;
baselineY += extra;
lineHeight = mMaxBottomBoxHeight;
}
if (lineHeight < mMaxTopBoxHeight) {
lineHeight = mMaxTopBoxHeight;
}
#ifdef NOISY_VERTICAL_ALIGN
printf(" ==> lineHeight=%d baselineY=%d\n", lineHeight, baselineY);
#endif
// Now position all of the frames in the root span. We will also
// recurse over the child spans and place any top/bottom aligned
// frames we find.
// XXX PERFORMANCE: set a bit per-span to avoid the extra work
// (propogate it upward too)
PerFrameData* pfd = psd->mFirstFrame;
nscoord maxElementWidth = 0;
nscoord maxElementHeight = 0;
while (nsnull != pfd) {
// Compute max-element-size if necessary
if (mComputeMaxElementSize) {
nscoord mw = pfd->mMaxElementSize.width +
pfd->mMargin.left + pfd->mMargin.right;
if (maxElementWidth < mw) {
maxElementWidth = mw;
}
nscoord mh = pfd->mMaxElementSize.height +
pfd->mMargin.top + pfd->mMargin.bottom;
if (maxElementHeight < mh) {
maxElementHeight = mh;
}
}
PerSpanData* span = pfd->mSpan;
#ifdef DEBUG
NS_ASSERTION(0xFF != pfd->mVerticalAlign, "umr");
#endif
switch (pfd->mVerticalAlign) {
case VALIGN_TOP:
if (span) {
pfd->mBounds.y = mTopEdge - pfd->mBorderPadding.top +
span->mTopLeading;
}
else {
pfd->mBounds.y = mTopEdge + pfd->mMargin.top;
}
break;
case VALIGN_BOTTOM:
if (span) {
// Compute bottom leading
pfd->mBounds.y = mTopEdge + lineHeight -
pfd->mBounds.height + pfd->mBorderPadding.bottom -
span->mBottomLeading;
}
else {
pfd->mBounds.y = mTopEdge + lineHeight - pfd->mMargin.bottom -
pfd->mBounds.height;
}
break;
case VALIGN_OTHER:
pfd->mBounds.y += baselineY;
break;
}
pfd->mFrame->SetRect(pfd->mBounds);
#ifdef NOISY_VERTICAL_ALIGN
printf(" ");
nsFrame::ListTag(stdout, pfd->mFrame);
printf(": y=%d\n", pfd->mBounds.y);
#endif
if (span) {
nscoord distanceFromTop = pfd->mBounds.y - mTopEdge;
PlaceTopBottomFrames(span, distanceFromTop, lineHeight);
}
pfd = pfd->mNext;
}
// Fill in returned line-box and max-element-size data
aLineBoxResult.x = psd->mLeftEdge;
aLineBoxResult.y = mTopEdge;
aLineBoxResult.width = psd->mX - psd->mLeftEdge;
aLineBoxResult.height = lineHeight;
aMaxElementSizeResult.width = maxElementWidth;
aMaxElementSizeResult.height = maxElementHeight;
// Undo root-span mFrame pointer to prevent brane damage later on...
mRootSpan->mFrame = nsnull;
}
void
nsLineLayout::PlaceTopBottomFrames(PerSpanData* psd,
nscoord aDistanceFromTop,
nscoord aLineHeight)
{
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
PerSpanData* span = pfd->mSpan;
#ifdef DEBUG
NS_ASSERTION(0xFF != pfd->mVerticalAlign, "umr");
#endif
switch (pfd->mVerticalAlign) {
case VALIGN_TOP:
if (span) {
pfd->mBounds.y = -aDistanceFromTop - pfd->mBorderPadding.top +
span->mTopLeading;
}
else {
pfd->mBounds.y = -aDistanceFromTop + pfd->mMargin.top;
}
pfd->mFrame->SetRect(pfd->mBounds);
#ifdef NOISY_VERTICAL_ALIGN
printf(" ");
nsFrame::ListTag(stdout, pfd->mFrame);
printf(": y=%d dTop=%d [bp.top=%d topLeading=%d]\n",
pfd->mBounds.y, aDistanceFromTop,
span ? pfd->mBorderPadding.top : 0,
span ? span->mTopLeading : 0);
#endif
break;
case VALIGN_BOTTOM:
if (span) {
// Compute bottom leading
pfd->mBounds.y = -aDistanceFromTop + aLineHeight -
pfd->mBounds.height + pfd->mBorderPadding.bottom -
span->mBottomLeading;
}
else {
pfd->mBounds.y = -aDistanceFromTop + aLineHeight -
pfd->mMargin.bottom - pfd->mBounds.height;
}
pfd->mFrame->SetRect(pfd->mBounds);
#ifdef NOISY_VERTICAL_ALIGN
printf(" ");
nsFrame::ListTag(stdout, pfd->mFrame);
printf(": y=%d\n", pfd->mBounds.y);
#endif
break;
}
if (span) {
nscoord distanceFromTop = aDistanceFromTop + pfd->mBounds.y;
PlaceTopBottomFrames(span, distanceFromTop, aLineHeight);
}
pfd = pfd->mNext;
}
}
// Vertically place frames within a given span. Note: this doesn't
// place top/bottom aligned frames as those have to wait until the
// entire line box height is known. This is called after the span
// frame has finished being reflowed so that we know its height.
void
nsLineLayout::VerticalAlignFrames(PerSpanData* psd)
{
// Get parent frame info
PerFrameData* parentPFD = psd->mFrame;
nsIFrame* parentFrame = parentPFD->mFrame;
// Get the parent frame's font for all of the frames in this span
const nsStyleFont* parentFont;
parentFrame->GetStyleData(eStyleStruct_Font,
(const nsStyleStruct*&)parentFont);
nsIRenderingContext* rc = mBlockReflowState->rendContext;
rc->SetFont(parentFont->mFont);
nsIFontMetrics* fm;
rc->GetFontMetrics(fm);
// Setup baselineY, minY, and maxY
nscoord baselineY, minY, maxY;
if (psd == mRootSpan) {
// Use a zero baselineY since we don't yet know where the baseline
// will be (until we know how tall the line is; then we will
// know). In addition, use extreme values for the minY and maxY
// values so that only the child frames will impact their values
// (since these are children of the block, there is no span box to
// provide initial values).
baselineY = minY = maxY = 0;
#ifdef NOISY_VERTICAL_ALIGN
nsFrame::ListTag(stdout, parentFrame);
printf(": pass1 valign frames: topEdge=%d minLineHeight=%d\n",
mTopEdge, mMinLineHeight);
#endif
}
else if (0 != parentPFD->mBounds.height) {
// Compute the logical height for this span. Also compute the top
// leading.
nscoord logicalHeight =
nsHTMLReflowState::CalcLineHeight(mPresContext, parentFrame);
nscoord contentHeight = parentPFD->mBounds.height -
parentPFD->mBorderPadding.top - parentPFD->mBorderPadding.bottom;
if (logicalHeight > 0) {
nscoord leading = logicalHeight - contentHeight;
psd->mTopLeading = leading / 2;
psd->mBottomLeading = leading - psd->mTopLeading;
}
else {
psd->mTopLeading = 0;
psd->mBottomLeading = 0;
logicalHeight = contentHeight;
}
psd->mLogicalHeight = logicalHeight;
// The initial values for the min and max Y values are in the spans
// coordinate space, and cover the logical height of the span. If
// there are child frames in this span that stick out of this area
// then the minY and maxY are updated by the amount of logical
// height that is outside this range.
minY = parentPFD->mBorderPadding.top - psd->mTopLeading;
maxY = minY + psd->mLogicalHeight;
// This is the distance from the top edge of the parents visual
// box to the baseline.
nscoord parentAscent;
fm->GetMaxAscent(parentAscent);
baselineY = parentAscent + parentPFD->mBorderPadding.top;
#ifdef NOISY_VERTICAL_ALIGN
nsFrame::ListTag(stdout, parentFrame);
printf(": baseLine=%d logicalHeight=%d topLeading=%d h=%d bp=%d,%d\n",
baselineY, logicalHeight, psd->mTopLeading,
parentPFD->mBounds.height,
parentPFD->mBorderPadding.top, parentPFD->mBorderPadding.bottom);
#endif
}
else {
// When a span container is zero height it means that all of its
// kids are zero height as well.
baselineY = minY = maxY = 0;
psd->mTopLeading = 0;
psd->mBottomLeading = 0;
psd->mLogicalHeight = 0;
#ifdef NOISY_VERTICAL_ALIGN
printf(" ==> [empty line]\n");
#endif
// return;
}
nscoord maxTopBoxHeight = 0;
nscoord maxBottomBoxHeight = 0;
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
nsIFrame* frame = pfd->mFrame;
// Compute the logical height of the frame
nscoord logicalHeight;
nscoord topLeading;
PerSpanData* frameSpan = pfd->mSpan;
if (frameSpan) {
// For span frames the logical-height and top-leading was
// pre-computed when the span was reflowed.
logicalHeight = frameSpan->mLogicalHeight;
topLeading = frameSpan->mTopLeading;
}
else {
// For other elements the logical height is the same as the
// frames height plus its margins.
logicalHeight = pfd->mBounds.height + pfd->mMargin.top +
pfd->mMargin.bottom;
topLeading = 0;
}
// Get vertical-align property
const nsStyleText* textStyle;
frame->GetStyleData(eStyleStruct_Text, (const nsStyleStruct*&)textStyle);
nsStyleUnit verticalAlignUnit = textStyle->mVerticalAlign.GetUnit();
if (eStyleUnit_Inherit == verticalAlignUnit) {
printf("XXX: vertical-align: inherit not implemented for ");
nsFrame::ListTag(stdout, frame);
printf("\n");
}
PRUint8 verticalAlignEnum;
nscoord parentAscent, parentDescent, parentXHeight;
nscoord parentSuperscript, parentSubscript;
nscoord coordOffset, percentOffset, elementLineHeight;
nscoord revisedBaselineY;
switch (verticalAlignUnit) {
case eStyleUnit_Enumerated:
default:
if (eStyleUnit_Enumerated == verticalAlignUnit) {
verticalAlignEnum = textStyle->mVerticalAlign.GetIntValue();
}
else {
verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_BASELINE;
}
switch (verticalAlignEnum) {
default:
case NS_STYLE_VERTICAL_ALIGN_BASELINE:
// The elements baseline is aligned with the baseline of
// the parent.
if (frameSpan) {
// XXX explain
pfd->mBounds.y = baselineY - pfd->mAscent;
}
else {
// For non-span elements the borders, padding and
// margins are significant. Use the visual box height
// and the bottom margin as the distance off of the
// baseline.
pfd->mBounds.y = baselineY - pfd->mAscent - pfd->mMargin.bottom;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
case NS_STYLE_VERTICAL_ALIGN_SUB:
// Lower the baseline of the box to the subscript offset
// of the parent's box. This is identical to the baseline
// alignment except for the addition of the subscript
// offset to the baseline Y.
fm->GetSubscriptOffset(parentSubscript);
revisedBaselineY = baselineY + parentSubscript;
if (frameSpan) {
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
}
else {
pfd->mBounds.y = revisedBaselineY - pfd->mAscent -
pfd->mMargin.bottom;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
case NS_STYLE_VERTICAL_ALIGN_SUPER:
// Raise the baseline of the box to the superscript offset
// of the parent's box. This is identical to the baseline
// alignment except for the subtraction of the superscript
// offset to the baseline Y.
fm->GetSuperscriptOffset(parentSuperscript);
revisedBaselineY = baselineY - parentSuperscript;
if (frameSpan) {
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
}
else {
pfd->mBounds.y = revisedBaselineY - pfd->mAscent -
pfd->mMargin.bottom;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
case NS_STYLE_VERTICAL_ALIGN_TOP:
pfd->mVerticalAlign = VALIGN_TOP;
if (logicalHeight > maxTopBoxHeight) {
maxTopBoxHeight = logicalHeight;
}
break;
case NS_STYLE_VERTICAL_ALIGN_BOTTOM:
pfd->mVerticalAlign = VALIGN_BOTTOM;
if (logicalHeight > maxBottomBoxHeight) {
maxBottomBoxHeight = logicalHeight;
}
break;
case NS_STYLE_VERTICAL_ALIGN_MIDDLE:
// Align the midpoint of the frame with 1/2 the parents
// x-height above the baseline.
fm->GetXHeight(parentXHeight);
if (frameSpan) {
pfd->mBounds.y = baselineY -
(parentXHeight + pfd->mBounds.height)/2;
}
else {
pfd->mBounds.y = baselineY - (parentXHeight + logicalHeight)/2 +
pfd->mMargin.top;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
case NS_STYLE_VERTICAL_ALIGN_TEXT_TOP:
// The top of the logical box is aligned with the top of
// the parent elements text.
fm->GetMaxAscent(parentAscent);
if (frameSpan) {
pfd->mBounds.y = baselineY - parentAscent -
pfd->mBorderPadding.top + frameSpan->mTopLeading;
}
else {
pfd->mBounds.y = baselineY - parentAscent + pfd->mMargin.top;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
case NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM:
// The bottom of the logical box is aligned with the
// bottom of the parent elements text.
fm->GetMaxDescent(parentDescent);
if (frameSpan) {
pfd->mBounds.y = baselineY + parentDescent -
pfd->mBounds.height + pfd->mBorderPadding.bottom -
frameSpan->mBottomLeading;
}
else {
pfd->mBounds.y = baselineY + parentDescent -
pfd->mBounds.height - pfd->mMargin.bottom;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
}
break;
case eStyleUnit_Coord:
// According to the CSS2 spec (10.8.1), a positive value
// "raises" the box by the given distance while a negative value
// "lowers" the box by the given distance (with zero being the
// baseline). Since Y coordinates increase towards the bottom of
// the screen we reverse the sign.
coordOffset = textStyle->mVerticalAlign.GetCoordValue();
revisedBaselineY = baselineY - coordOffset;
if (frameSpan) {
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
}
else {
pfd->mBounds.y = revisedBaselineY - pfd->mAscent -
pfd->mMargin.bottom;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
case eStyleUnit_Percent:
// Similar to a length value (eStyleUnit_Coord) except that the
// percentage is a function of the elements line-height value.
elementLineHeight =
nsHTMLReflowState::CalcLineHeight(mPresContext, frame);
percentOffset = nscoord(
textStyle->mVerticalAlign.GetPercentValue() * elementLineHeight
);
revisedBaselineY = baselineY - percentOffset;
if (frameSpan) {
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
}
else {
pfd->mBounds.y = revisedBaselineY - pfd->mAscent -
pfd->mMargin.bottom;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
}
// Update minY/maxY for frames that we just placed
if (pfd->mVerticalAlign == VALIGN_OTHER) {
nscoord yTop, yBottom;
if (frameSpan) {
// For spans that were are now placing, use their position
// plus their already computed min-Y and max-Y values for
// computing yTop and yBottom.
yTop = pfd->mBounds.y + frameSpan->mMinY;
yBottom = pfd->mBounds.y + frameSpan->mMaxY;
}
else {
yTop = pfd->mBounds.y - pfd->mMargin.top;
yBottom = yTop + logicalHeight;
}
if (yTop < minY) minY = yTop;
if (yBottom > maxY) maxY = yBottom;
#ifdef NOISY_VERTICAL_ALIGN
printf(" ");
nsFrame::ListTag(stdout, frame);
printf(": raw: a=%d d=%d h=%d bp=%d,%d logical: h=%d leading=%d y=%d minY=%d maxY=%d\n",
pfd->mAscent, pfd->mDescent, pfd->mBounds.height,
pfd->mBorderPadding.top, pfd->mBorderPadding.bottom,
logicalHeight,
pfd->mSpan ? topLeading : 0,
pfd->mBounds.y, minY, maxY);
#endif
if (psd != mRootSpan) {
frame->SetRect(pfd->mBounds);
}
}
pfd = pfd->mNext;
}
NS_RELEASE(fm);
psd->mMinY = minY;
psd->mMaxY = maxY;
#ifdef NOISY_VERTICAL_ALIGN
printf(" ==> minY=%d maxY=%d delta=%d maxTopBoxHeight=%d maxBottomBoxHeight=%d\n",
minY, maxY, maxY - minY, maxTopBoxHeight, maxBottomBoxHeight);
#endif
if (maxTopBoxHeight > mMaxTopBoxHeight) {
mMaxTopBoxHeight = maxTopBoxHeight;
}
if (maxBottomBoxHeight > mMaxBottomBoxHeight) {
mMaxBottomBoxHeight = maxBottomBoxHeight;
}
}
void
nsLineLayout::TrimTrailingWhiteSpace(nsRect& aLineBounds)
{
}
void
nsLineLayout::HorizontalAlignFrames(nsRect& aLineBounds, PRBool aAllowJustify)
{
PerSpanData* psd = mRootSpan;
nscoord availWidth = psd->mRightEdge;
if (NS_UNCONSTRAINEDSIZE == availWidth) {
// Don't bother horizontal aligning on pass1 table reflow
#ifdef REALLY_NOISY_HORIZONTAL_ALIGN
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": skipping horizontal alignment in pass1 table reflow\n");
#endif
return;
}
availWidth -= psd->mLeftEdge;
nscoord remainingWidth = availWidth - aLineBounds.width;
#ifdef REALLY_NOISY_HORIZONTAL_ALIGN
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": availWidth=%d lineWidth=%d delta=%d\n",
availWidth, aLineBounds.width, remainingWidth);
#endif
if (remainingWidth > 0) {
nscoord dx = 0;
switch (mTextAlign) {
case NS_STYLE_TEXT_ALIGN_DEFAULT:
if (NS_STYLE_DIRECTION_LTR == psd->mDirection) {
// default alignment for left-to-right is left so do nothing
break;
}
// Fall through to align right case for default alignment
// used when the direction is right-to-left.
case NS_STYLE_TEXT_ALIGN_RIGHT:
case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT:
dx = remainingWidth;
break;
case NS_STYLE_TEXT_ALIGN_LEFT:
break;
case NS_STYLE_TEXT_ALIGN_JUSTIFY:
// If this is not the last line then go ahead and justify the
// frames in the line. If it is the last line then if the
// direction is right-to-left then we right-align the frames.
if (aAllowJustify) {
break;
}
else if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
// right align the frames
dx = remainingWidth;
}
break;
case NS_STYLE_TEXT_ALIGN_CENTER:
case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
dx = remainingWidth / 2;
break;
}
if (0 != dx) {
PerFrameData* pfd = psd->mFirstFrame;
while (nsnull != pfd) {
pfd->mBounds.x += dx;
pfd->mFrame->SetRect(pfd->mBounds);
pfd = pfd->mNext;
}
}
if (NS_STYLE_DIRECTION_RTL == psd->mDirection && !psd->mChangedFrameDirection) {
psd->mChangedFrameDirection = PR_TRUE;
/* Assume that all frames have been right aligned.*/
PerFrameData* pfd = psd->mFirstFrame;
PRUint32 maxX = psd->mRightEdge;
while (nsnull != pfd) {
pfd->mBounds.x = maxX - pfd->mBounds.width;
pfd->mFrame->SetRect(pfd->mBounds);
maxX = pfd->mBounds.x;
pfd = pfd->mNext;
}
}
}
}
void
nsLineLayout::RelativePositionFrames(nsRect& aCombinedArea)
{
RelativePositionFrames(mRootSpan, aCombinedArea);
}
void
nsLineLayout::RelativePositionFrames(PerSpanData* psd, nsRect& aCombinedArea)
{
nsPoint origin;
nsRect spanCombinedArea;
PerFrameData* pfd;
nscoord x0, y0, x1, y1;
if (nsnull != psd->mFrame) {
// The minimum combined area for the frames in a span covers the
// entire span frame.
pfd = psd->mFrame;
x0 = 0;
y0 = 0;
x1 = pfd->mBounds.width;
y1 = pfd->mBounds.height;
}
else {
// The minimum combined area for the frames that are direct
// children of the block starts at the upper left corner of the
// line but has no width or height.
x1 = x0 = psd->mLeftEdge;
y1 = y0 = mTopEdge;
}
pfd = psd->mFirstFrame;
while (nsnull != pfd) {
nscoord x = pfd->mBounds.x;
nscoord y = pfd->mBounds.y;
// Adjust the origin of the frame
if (pfd->mRelativePos) {
nsIFrame* frame = pfd->mFrame;
frame->GetOrigin(origin);
// XXX what about right and bottom?
nscoord dx = pfd->mOffsets.left;
nscoord dy = pfd->mOffsets.top;
frame->MoveTo(origin.x + dx, origin.y + dy);
x += dx;
y += dy;
}
// Note: the combined area of a child is in its coordinate
// system. We adjust the childs combined area into our coordinate
// system before computing the aggregated value by adding in
// <b>x</b> and <b>y</b> which were computed above.
nsRect* r = &pfd->mCombinedArea;
if (pfd->mSpan) {
// Compute a new combined area for the child span before
// aggregating it into our combined area.
r = &spanCombinedArea;
RelativePositionFrames(pfd->mSpan, spanCombinedArea);
}
nscoord xl = x + r->x;
nscoord xr = x + r->XMost();
if (xl < x0) {
x0 = xl;
}
if (xr > x1) {
x1 = xr;
}
nscoord yt = y + r->y;
nscoord yb = y + r->YMost();
if (yt < y0) {
y0 = yt;
}
if (yb > y1) {
y1 = yb;
}
pfd = pfd->mNext;
}
// Compute aggregated combined area
aCombinedArea.x = x0;
aCombinedArea.y = y0;
aCombinedArea.width = x1 - x0;
aCombinedArea.height = y1 - y0;
// If we just computed a spans combined area, we need to update its
// NS_FRAME_OUTSIDE_CHILDREN bit..
if (nsnull != psd->mFrame) {
pfd = psd->mFrame;
nsIFrame* frame = pfd->mFrame;
nsFrameState oldState;
frame->GetFrameState(&oldState);
nsFrameState newState = oldState & ~NS_FRAME_OUTSIDE_CHILDREN;
if ((x0 < 0) || (y0 < 0) ||
(x1 > pfd->mBounds.width) || (y1 > pfd->mBounds.height)) {
newState |= NS_FRAME_OUTSIDE_CHILDREN;
}
if (newState != oldState) {
frame->SetFrameState(newState);
}
}
}
void
nsLineLayout::ForgetWordFrame(nsIFrame* aFrame)
{
NS_ASSERTION((void*)aFrame == mWordFrames[0], "forget-word-frame");
if (0 != mWordFrames.Count()) {
mWordFrames.RemoveElementAt(0);
}
}
nsIFrame*
nsLineLayout::FindNextText(nsIFrame* aFrame)
{
// Only the first-in-flows are present in the text run list so
// backup from the argument frame to its first-in-flow.
for (;;) {
nsIFrame* prevInFlow;
aFrame->GetPrevInFlow(&prevInFlow);
if (nsnull == prevInFlow) {
break;
}
aFrame = prevInFlow;
}
// Now look for the frame that follows aFrame's first-in-flow
nsTextRun* run = mReflowTextRuns;
while (nsnull != run) {
PRInt32 ix = run->mArray.IndexOf(aFrame);
if (ix >= 0) {
if (ix < run->mArray.Count() - 1) {
return (nsIFrame*) run->mArray[ix + 1];
}
}
run = run->mNext;
}
return nsnull;
}
nsresult
nsLineLayout::AddText(nsIFrame* aTextFrame)
{
if (nsnull == mNewTextRun) {
mNewTextRun = new nsTextRun();
if (nsnull == mNewTextRun) {
return NS_ERROR_OUT_OF_MEMORY;
}
*mTextRunP = mNewTextRun;
mTextRunP = &mNewTextRun->mNext;
}
#ifdef DEBUG_ADD_TEXT
{
// Check that text-frame is not already there
PRInt32 ix = mNewTextRun->mArray.IndexOf((void*)aTextFrame);
NS_ASSERTION(ix < 0, "text frame already in text run");
}
#endif
mNewTextRun->mArray.AppendElement(aTextFrame);/* XXX out-of-memory */
return NS_OK;
}
void
nsLineLayout::EndTextRun()
{
if (mNewTextRun) {
PRInt32 numTextInRun = mNewTextRun->mArray.Count();
if (numTextInRun < 2) {
// Don't bother remembering empty text-runs: reset the array
// back to zero elements. This effectively prepares this
// text-run for the next round. If it turns out there is no next
// round then we will get rid of it later in TakeTextRuns.
mNewTextRun->mArray.Clear();
}
}
mNewTextRun = nsnull;
}
nsTextRun*
nsLineLayout::TakeTextRuns()
{
nsTextRun* result = mTextRuns;
mTextRuns = nsnull;
mTextRunP = &mTextRuns;
mNewTextRun = nsnull;
// Eliminate any text-runs that are empty
nsTextRun** rp = &result;
nsTextRun* run = *rp;
while (run) {
if (0 == run->mArray.Count()) {
*rp = run->mNext;
delete run;
}
else {
rp = &run->mNext;
}
run = *rp;
}
return result;
}
PRBool
nsLineLayout::TreatFrameAsBlock(nsIFrame* aFrame)
{
const nsStyleDisplay* display;
const nsStylePosition* position;
aFrame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&) display);
aFrame->GetStyleData(eStyleStruct_Position,(const nsStyleStruct*&) position);
if (NS_STYLE_POSITION_ABSOLUTE == position->mPosition) {
return PR_FALSE;
}
if (NS_STYLE_FLOAT_NONE != display->mFloats) {
return PR_FALSE;
}
switch (display->mDisplay) {
case NS_STYLE_DISPLAY_BLOCK:
case NS_STYLE_DISPLAY_LIST_ITEM:
case NS_STYLE_DISPLAY_RUN_IN:
case NS_STYLE_DISPLAY_COMPACT:
case NS_STYLE_DISPLAY_TABLE:
return PR_TRUE;
}
return PR_FALSE;
}
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