Magic-Mirror/gecko-dev
1
0
Fork 0
mirror of https://github.com/mozilla/gecko-dev.git synced 2024-10-29 21:25:35 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
80ecd8538f
gecko-dev/layout/generic/nsLineLayout.cpp

2716 lines
96 KiB
C++
Raw Blame History

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* state and methods used while laying out a single line of a block frame */
#define PL_ARENA_CONST_ALIGN_MASK (sizeof(void*)-1)
#include "plarena.h"
#include "mozilla/Util.h"
#include "nsCOMPtr.h"
#include "nsLineLayout.h"
#include "nsBlockFrame.h"
#include "nsInlineFrame.h"
#include "nsStyleConsts.h"
#include "nsContainerFrame.h"
#include "nsFloatManager.h"
#include "nsStyleContext.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsGkAtoms.h"
#include "nsPlaceholderFrame.h"
#include "nsIContent.h"
#include "nsTextFragment.h"
#include "nsBidiUtils.h"
#include "nsLayoutUtils.h"
#include "nsTextFrame.h"
#include "nsCSSRendering.h"
#ifdef DEBUG
#undef 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
#undef NOISY_TRIM
#undef REALLY_NOISY_TRIM
#endif
using namespace mozilla;
//----------------------------------------------------------------------
#define FIX_BUG_50257
nsLineLayout::nsLineLayout(nsPresContext* aPresContext,
nsFloatManager* aFloatManager,
const nsHTMLReflowState* aOuterReflowState,
const nsLineList::iterator* aLine)
: mPresContext(aPresContext),
mFloatManager(aFloatManager),
mBlockReflowState(aOuterReflowState),
mLastOptionalBreakContent(nullptr),
mForceBreakContent(nullptr),
mBlockRS(nullptr),/* XXX temporary */
mLastOptionalBreakPriority(eNoBreak),
mLastOptionalBreakContentOffset(-1),
mForceBreakContentOffset(-1),
mMinLineHeight(0),
mTextIndent(0),
mFirstLetterStyleOK(false),
mIsTopOfPage(false),
mImpactedByFloats(false),
mLastFloatWasLetterFrame(false),
mLineIsEmpty(false),
mLineEndsInBR(false),
mNeedBackup(false),
mInFirstLine(false),
mGotLineBox(false),
mInFirstLetter(false),
mHasBullet(false),
mDirtyNextLine(false),
mLineAtStart(false)
{
NS_ASSERTION(aFloatManager || aOuterReflowState->frame->GetType() ==
nsGkAtoms::letterFrame,
"float manager should be present");
MOZ_COUNT_CTOR(nsLineLayout);
// Stash away some style data that we need
mStyleText = aOuterReflowState->frame->GetStyleText();
mLineNumber = 0;
mTotalPlacedFrames = 0;
mTopEdge = 0;
mTrimmableWidth = 0;
mInflationMinFontSize =
nsLayoutUtils::InflationMinFontSizeFor(aOuterReflowState->frame);
// 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 a lot of time in unneeded
// initialization.
PL_INIT_ARENA_POOL(&mArena, "nsLineLayout", 1024);
mFrameFreeList = nullptr;
mSpanFreeList = nullptr;
mCurrentSpan = mRootSpan = nullptr;
mSpanDepth = 0;
if (aLine) {
mGotLineBox = true;
mLineBox = *aLine;
}
}
nsLineLayout::~nsLineLayout()
{
MOZ_COUNT_DTOR(nsLineLayout);
NS_ASSERTION(nullptr == mRootSpan, "bad line-layout user");
// PL_FreeArenaPool takes our memory and puts in on a global free list so
// that the next time an arena makes an allocation it will not have to go
// all the way down to malloc. This is desirable as this class is created
// and destroyed in a tight loop.
//
// I looked at the code. It is not technically necessary to call
// PL_FinishArenaPool() after PL_FreeArenaPool(), but from an API
// standpoint, I think we are susposed to. It will be very fast anyway,
// since PL_FreeArenaPool() has done all the work.
PL_FreeArenaPool(&mArena);
PL_FinishArenaPool(&mArena);
}
// Find out if the frame has a non-null prev-in-flow, i.e., whether it
// is a continuation.
inline bool
HasPrevInFlow(nsIFrame *aFrame)
{
nsIFrame *prevInFlow = aFrame->GetPrevInFlow();
return prevInFlow != nullptr;
}
void
nsLineLayout::BeginLineReflow(nscoord aX, nscoord aY,
nscoord aWidth, nscoord aHeight,
bool aImpactedByFloats,
bool aIsTopOfPage,
uint8_t aDirection)
{
NS_ASSERTION(nullptr == mRootSpan, "bad linelayout user");
NS_WARN_IF_FALSE(aWidth != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
#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);
}
if ((aHeight != NS_UNCONSTRAINEDSIZE) && CRAZY_HEIGHT(aHeight)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": Init: bad caller: height WAS %d(0x%x)\n",
aHeight, aHeight);
}
#endif
#ifdef NOISY_REFLOW
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": BeginLineReflow: %d,%d,%d,%d impacted=%s %s\n",
aX, aY, aWidth, aHeight,
aImpactedByFloats?"true":"false",
aIsTopOfPage ? "top-of-page" : "");
#endif
#ifdef DEBUG
mSpansAllocated = mSpansFreed = mFramesAllocated = mFramesFreed = 0;
#endif
mFirstLetterStyleOK = false;
mIsTopOfPage = aIsTopOfPage;
mImpactedByFloats = aImpactedByFloats;
mTotalPlacedFrames = 0;
mLineIsEmpty = true;
mLineAtStart = true;
mLineEndsInBR = false;
mSpanDepth = 0;
mMaxTopBoxHeight = mMaxBottomBoxHeight = 0;
if (mGotLineBox) {
mLineBox->ClearHasBullet();
}
PerSpanData* psd;
NewPerSpanData(&psd);
mCurrentSpan = mRootSpan = psd;
psd->mReflowState = mBlockReflowState;
psd->mLeftEdge = aX;
psd->mX = aX;
psd->mRightEdge = aX + aWidth;
mTopEdge = aY;
psd->mNoWrap = !mStyleText->WhiteSpaceCanWrap();
psd->mDirection = aDirection;
psd->mChangedFrameDirection = false;
// If this is the first line of a block then see if the text-indent
// property amounts to anything.
if (0 == mLineNumber && !HasPrevInFlow(mBlockReflowState->frame)) {
const nsStyleCoord &textIndent = mStyleText->mTextIndent;
nscoord pctBasis = 0;
if (textIndent.HasPercent()) {
pctBasis =
nsHTMLReflowState::GetContainingBlockContentWidth(mBlockReflowState);
if (mGotLineBox) {
mLineBox->DisableResizeReflowOptimization();
}
}
nscoord indent = nsRuleNode::ComputeCoordPercentCalc(textIndent, pctBasis);
mTextIndent = indent;
if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
psd->mRightEdge -= indent;
}
else {
psd->mX += indent;
}
}
}
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 = nullptr;
NS_ASSERTION(mSpansAllocated == mSpansFreed, "leak");
NS_ASSERTION(mFramesAllocated == mFramesFreed, "leak");
#if 0
static int32_t maxSpansAllocated = NS_LINELAYOUT_NUM_SPANS;
static int32_t 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?
void
nsLineLayout::UpdateBand(const nsRect& aNewAvailSpace,
nsIFrame* aFloatFrame)
{
#ifdef REALLY_NOISY_REFLOW
printf("nsLL::UpdateBand %d, %d, %d, %d, frame=%p\n will set mImpacted to true\n",
aNewAvailSpace.x, aNewAvailSpace.y,
aNewAvailSpace.width, aNewAvailSpace.height,
aFloatFrame);
#endif
#ifdef DEBUG
if ((aNewAvailSpace.width != NS_UNCONSTRAINEDSIZE) && CRAZY_WIDTH(aNewAvailSpace.width)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": UpdateBand: bad caller: width WAS %d(0x%x)\n",
aNewAvailSpace.width, aNewAvailSpace.width);
}
if ((aNewAvailSpace.height != NS_UNCONSTRAINEDSIZE) && CRAZY_HEIGHT(aNewAvailSpace.height)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": UpdateBand: bad caller: height WAS %d(0x%x)\n",
aNewAvailSpace.height, aNewAvailSpace.height);
}
#endif
// Compute the difference between last times width and the new width
NS_WARN_IF_FALSE(mRootSpan->mRightEdge != NS_UNCONSTRAINEDSIZE &&
aNewAvailSpace.width != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
// The root span's mLeftEdge moves to aX
nscoord deltaX = aNewAvailSpace.x - mRootSpan->mLeftEdge;
// The width of all spans changes by this much (the root span's
// mRightEdge moves to aX + aWidth, its new width is aWidth)
nscoord deltaWidth = aNewAvailSpace.width - (mRootSpan->mRightEdge - mRootSpan->mLeftEdge);
#ifdef NOISY_REFLOW
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": UpdateBand: %d,%d,%d,%d deltaWidth=%d deltaX=%d\n",
aNewAvailSpace.x, aNewAvailSpace.y,
aNewAvailSpace.width, aNewAvailSpace.height, deltaWidth, deltaX);
#endif
// Update the root span position
mRootSpan->mLeftEdge += deltaX;
mRootSpan->mRightEdge += deltaX;
mRootSpan->mX += deltaX;
// Now update the right edges of the open spans to account for any
// change in available space width
for (PerSpanData* psd = mCurrentSpan; psd; psd = psd->mParent) {
psd->mRightEdge += deltaWidth;
psd->mContainsFloat = true;
NS_ASSERTION(psd->mX - mTrimmableWidth <= psd->mRightEdge,
"We placed a float where there was no room!");
#ifdef NOISY_REFLOW
printf(" span %p: oldRightEdge=%d newRightEdge=%d\n",
psd, psd->mRightEdge - deltaRightEdge, psd->mRightEdge);
#endif
}
NS_ASSERTION(mRootSpan->mContainsFloat &&
mRootSpan->mLeftEdge == aNewAvailSpace.x &&
mRootSpan->mRightEdge == aNewAvailSpace.XMost(),
"root span was updated incorrectly?");
// Update frame bounds
// 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.
if (deltaX != 0) {
for (PerFrameData* pfd = mRootSpan->mFirstFrame; pfd; pfd = pfd->mNext) {
pfd->mBounds.x += deltaX;
}
}
mTopEdge = aNewAvailSpace.y;
mImpactedByFloats = true;
mLastFloatWasLetterFrame = nsGkAtoms::letterFrame == aFloatFrame->GetType();
}
nsresult
nsLineLayout::NewPerSpanData(PerSpanData** aResult)
{
PerSpanData* psd = mSpanFreeList;
if (nullptr == psd) {
void *mem;
PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerSpanData));
if (nullptr == mem) {
return NS_ERROR_OUT_OF_MEMORY;
}
psd = reinterpret_cast<PerSpanData*>(mem);
}
else {
mSpanFreeList = psd->mNextFreeSpan;
}
psd->mParent = nullptr;
psd->mFrame = nullptr;
psd->mFirstFrame = nullptr;
psd->mLastFrame = nullptr;
psd->mContainsFloat = false;
psd->mZeroEffectiveSpanBox = false;
psd->mHasNonemptyContent = false;
#ifdef DEBUG
mSpansAllocated++;
#endif
*aResult = psd;
return NS_OK;
}
nsresult
nsLineLayout::BeginSpan(nsIFrame* aFrame,
const nsHTMLReflowState* aSpanReflowState,
nscoord aLeftEdge,
nscoord aRightEdge,
nscoord* aBaseline)
{
NS_ASSERTION(aRightEdge != NS_UNCONSTRAINEDSIZE,
"should no longer be using unconstrained sizes");
#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;
psd->mBaseline = aBaseline;
psd->mNoWrap =
!aSpanReflowState->frame->GetStyleText()->WhiteSpaceCanWrap();
psd->mDirection = aSpanReflowState->mStyleVisibility->mDirection;
psd->mChangedFrameDirection = false;
// Switch to new span
mCurrentSpan = psd;
mSpanDepth++;
}
return rv;
}
nscoord
nsLineLayout::EndSpan(nsIFrame* aFrame)
{
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 widthResult = psd->mLastFrame ? (psd->mX - psd->mLeftEdge) : 0;
mSpanDepth--;
mCurrentSpan->mReflowState = nullptr; // no longer valid so null it out!
mCurrentSpan = mCurrentSpan->mParent;
return widthResult;
}
int32_t
nsLineLayout::GetCurrentSpanCount() const
{
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
int32_t count = 0;
PerFrameData* pfd = mRootSpan->mFirstFrame;
while (nullptr != pfd) {
count++;
pfd = pfd->mNext;
}
return count;
}
void
nsLineLayout::SplitLineTo(int32_t 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 (nullptr != pfd) {
if (--aNewCount == 0) {
// Truncate list at pfd (we keep pfd, but anything following is freed)
PerFrameData* next = pfd->mNext;
pfd->mNext = nullptr;
psd->mLastFrame = pfd;
// Now release all of the frames following pfd
pfd = next;
while (nullptr != pfd) {
next = pfd->mNext;
pfd->mNext = mFrameFreeList;
mFrameFreeList = pfd;
#ifdef DEBUG
mFramesFreed++;
#endif
if (nullptr != 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 = nullptr;
psd->mLastFrame = nullptr;
}
else {
PerFrameData* prevFrame = pfd->mPrev;
prevFrame->mNext = nullptr;
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 (nullptr != 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 (nullptr != pfd) {
if (nullptr != 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 it's free too
psd->mNextFreeSpan = mSpanFreeList;
mSpanFreeList = psd;
#ifdef DEBUG
mSpansFreed++;
#endif
}
bool
nsLineLayout::IsZeroHeight()
{
PerSpanData* psd = mCurrentSpan;
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != pfd) {
if (0 != pfd->mBounds.height) {
return false;
}
pfd = pfd->mNext;
}
return true;
}
nsresult
nsLineLayout::NewPerFrameData(PerFrameData** aResult)
{
PerFrameData* pfd = mFrameFreeList;
if (nullptr == pfd) {
void *mem;
PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerFrameData));
if (nullptr == mem) {
return NS_ERROR_OUT_OF_MEMORY;
}
pfd = reinterpret_cast<PerFrameData*>(mem);
}
else {
mFrameFreeList = pfd->mNext;
}
pfd->mSpan = nullptr;
pfd->mNext = nullptr;
pfd->mPrev = nullptr;
pfd->mFrame = nullptr;
pfd->mFlags = 0; // all flags default to false
#ifdef DEBUG
pfd->mVerticalAlign = 0xFF;
mFramesAllocated++;
#endif
*aResult = pfd;
return NS_OK;
}
bool
nsLineLayout::LineIsBreakable() const
{
// XXX mTotalPlacedFrames should go away and we should just use
// mLineIsEmpty here instead
if ((0 != mTotalPlacedFrames) || mImpactedByFloats) {
return true;
}
return false;
}
// Checks all four sides for percentage units. This means it should
// only be used for things (margin, padding) where percentages on top
// and bottom depend on the *width* just like percentages on left and
// right.
static bool
HasPercentageUnitSide(const nsStyleSides& aSides)
{
NS_FOR_CSS_SIDES(side) {
if (aSides.Get(side).HasPercent())
return true;
}
return false;
}
static bool
IsPercentageAware(const nsIFrame* aFrame)
{
NS_ASSERTION(aFrame, "null frame is not allowed");
nsIAtom *fType = aFrame->GetType();
if (fType == nsGkAtoms::textFrame) {
// None of these things can ever be true for text frames.
return false;
}
// Some of these things don't apply to non-replaced inline frames
// (that is, fType == nsGkAtoms::inlineFrame), but we won't bother making
// things unnecessarily complicated, since they'll probably be set
// quite rarely.
const nsStyleMargin* margin = aFrame->GetStyleMargin();
if (HasPercentageUnitSide(margin->mMargin)) {
return true;
}
const nsStylePadding* padding = aFrame->GetStylePadding();
if (HasPercentageUnitSide(padding->mPadding)) {
return true;
}
// Note that borders can't be aware of percentages
const nsStylePosition* pos = aFrame->GetStylePosition();
if ((pos->WidthDependsOnContainer() &&
pos->mWidth.GetUnit() != eStyleUnit_Auto) ||
pos->MaxWidthDependsOnContainer() ||
pos->MinWidthDependsOnContainer() ||
pos->OffsetHasPercent(NS_SIDE_RIGHT) ||
pos->OffsetHasPercent(NS_SIDE_LEFT)) {
return true;
}
if (eStyleUnit_Auto == pos->mWidth.GetUnit()) {
// We need to check for frames that shrink-wrap when they're auto
// width.
const nsStyleDisplay* disp = aFrame->GetStyleDisplay();
if (disp->mDisplay == NS_STYLE_DISPLAY_INLINE_BLOCK ||
disp->mDisplay == NS_STYLE_DISPLAY_INLINE_TABLE ||
fType == nsGkAtoms::HTMLButtonControlFrame ||
fType == nsGkAtoms::gfxButtonControlFrame ||
fType == nsGkAtoms::fieldSetFrame ||
fType == nsGkAtoms::comboboxDisplayFrame) {
return true;
}
// Per CSS 2.1, section 10.3.2:
// If 'height' and 'width' both have computed values of 'auto' and
// the element has an intrinsic ratio but no intrinsic height or
// width and the containing block's width does not itself depend
// on the replaced element's width, then the used value of 'width'
// is calculated from the constraint equation used for
// block-level, non-replaced elements in normal flow.
nsIFrame *f = const_cast<nsIFrame*>(aFrame);
if (f->GetIntrinsicRatio() != nsSize(0, 0) &&
// Some percents are treated like 'auto', so check != coord
pos->mHeight.GetUnit() != eStyleUnit_Coord) {
const nsIFrame::IntrinsicSize &intrinsicSize = f->GetIntrinsicSize();
if (intrinsicSize.width.GetUnit() == eStyleUnit_None &&
intrinsicSize.height.GetUnit() == eStyleUnit_None) {
return true;
}
}
}
return false;
}
nsresult
nsLineLayout::ReflowFrame(nsIFrame* aFrame,
nsReflowStatus& aReflowStatus,
nsHTMLReflowMetrics* aMetrics,
bool& aPushedFrame)
{
// Initialize OUT parameter
aPushedFrame = false;
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
mTextJustificationNumSpaces = 0;
mTextJustificationNumLetters = 0;
// Stash copies of some of the computed state away for later
// (vertical alignment, for example)
pfd->mFrame = aFrame;
// 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.
pfd->mBounds.x = psd->mX;
pfd->mBounds.y = mTopEdge;
// 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 and is not
// impacted by a float, then we go ahead and place it anyway. (If the line
// is impacted by one or more floats, then it is safe to break because
// we can move the line down below float(s).)
//
// 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.
bool notSafeToBreak = LineIsEmpty() && !mImpactedByFloats;
// Figure out whether we're talking about a textframe here
nsIAtom* frameType = aFrame->GetType();
bool isText = frameType == nsGkAtoms::textFrame;
// Compute the available size for the frame. This available width
// includes room for the side margins.
// For now, set the available height to unconstrained always.
nsSize availSize(mBlockReflowState->ComputedWidth(), NS_UNCONSTRAINEDSIZE);
// If the available size is greater than the maximum line box width (if
// specified), then we need to adjust the line box width to be at the max
// possible width.
nscoord maxLineBoxWidth = aFrame->PresContext()->PresShell()->MaxLineBoxWidth();
if (maxLineBoxWidth > 0 && psd->mRightEdge - psd->mLeftEdge > maxLineBoxWidth) {
psd->mRightEdge = psd->mLeftEdge + maxLineBoxWidth;
}
// Inline-ish and text-ish things don't compute their width;
// everything else does. We need to give them an available width that
// reflects the space left on the line.
NS_WARN_IF_FALSE(psd->mRightEdge != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
nscoord availableSpaceOnLine = psd->mRightEdge - psd->mX;
// Setup reflow state for reflowing the frame
Maybe<nsHTMLReflowState> reflowStateHolder;
if (!isText) {
reflowStateHolder.construct(mPresContext, *psd->mReflowState,
aFrame, availSize);
nsHTMLReflowState& reflowState = reflowStateHolder.ref();
reflowState.mLineLayout = this;
reflowState.mFlags.mIsTopOfPage = mIsTopOfPage;
if (reflowState.ComputedWidth() == NS_UNCONSTRAINEDSIZE)
reflowState.availableWidth = availableSpaceOnLine;
pfd->mMargin = reflowState.mComputedMargin;
pfd->mBorderPadding = reflowState.mComputedBorderPadding;
pfd->SetFlag(PFD_RELATIVEPOS,
(reflowState.mStyleDisplay->mPosition == NS_STYLE_POSITION_RELATIVE));
if (pfd->GetFlag(PFD_RELATIVEPOS)) {
pfd->mOffsets = reflowState.mComputedOffsets;
}
// Apply start margins (as appropriate) to the frame computing the
// new starting x,y coordinates for the frame.
ApplyStartMargin(pfd, reflowState);
} else {
pfd->mMargin.SizeTo(0, 0, 0, 0);
pfd->mBorderPadding.SizeTo(0, 0, 0, 0);
pfd->mOffsets.SizeTo(0, 0, 0, 0);
// Text reflow doesn't look at the dirty bits on the frame being reflowed,
// so no need to propagate NS_FRAME_IS_DIRTY from the parent.
}
// See if this frame depends on the width of its containing block. If
// so, disable resize reflow optimizations for the line. (Note that,
// to be conservative, we do this if we *try* to fit a frame on a
// line, even if we don't succeed.) (Note also that we can only make
// this IsPercentageAware check *after* we've constructed our
// nsHTMLReflowState, because that construction may be what forces aFrame
// to lazily initialize its (possibly-percent-valued) intrinsic size.)
if (mGotLineBox && IsPercentageAware(aFrame)) {
mLineBox->DisableResizeReflowOptimization();
}
// Let frame know that are reflowing it. Note that we don't bother
// positioning the frame yet, because we're probably going to end up
// moving it when we do the vertical alignment
aFrame->WillReflow(mPresContext);
// Adjust spacemanager coordinate system for the frame.
nsHTMLReflowMetrics metrics;
#ifdef DEBUG
metrics.width = nscoord(0xdeadbeef);
metrics.height = nscoord(0xdeadbeef);
#endif
nscoord tx = pfd->mBounds.x;
nscoord ty = pfd->mBounds.y;
mFloatManager->Translate(tx, ty);
int32_t savedOptionalBreakOffset;
gfxBreakPriority savedOptionalBreakPriority;
nsIContent* savedOptionalBreakContent =
GetLastOptionalBreakPosition(&savedOptionalBreakOffset,
&savedOptionalBreakPriority);
if (!isText) {
rv = aFrame->Reflow(mPresContext, metrics, reflowStateHolder.ref(),
aReflowStatus);
if (NS_FAILED(rv)) {
NS_WARNING( "Reflow of frame failed in nsLineLayout" );
return rv;
}
} else {
static_cast<nsTextFrame*>(aFrame)->
ReflowText(*this, availableSpaceOnLine, psd->mReflowState->rendContext,
psd->mReflowState->mFlags.mBlinks, metrics, aReflowStatus);
}
pfd->mJustificationNumSpaces = mTextJustificationNumSpaces;
pfd->mJustificationNumLetters = mTextJustificationNumLetters;
// See if the frame is a placeholderFrame and if it is process
// the float. At the same time, check if the frame has any non-collapsed-away
// content.
bool placedFloat = false;
bool isEmpty;
if (!frameType) {
isEmpty = pfd->mFrame->IsEmpty();
} else {
if (nsGkAtoms::placeholderFrame == frameType) {
isEmpty = true;
pfd->SetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE, true);
nsIFrame* outOfFlowFrame = nsLayoutUtils::GetFloatFromPlaceholder(aFrame);
if (outOfFlowFrame) {
// Add mTrimmableWidth to the available width since if the line ends
// here, the width of the inline content will be reduced by
// mTrimmableWidth.
nscoord availableWidth = psd->mRightEdge - (psd->mX - mTrimmableWidth);
if (psd->mNoWrap) {
// If we place floats after inline content where there's
// no break opportunity, we don't know how much additional
// width is required for the non-breaking content after the float,
// so we can't know whether the float plus that content will fit
// on the line. So for now, don't place floats after inline
// content where there's no break opportunity. This is incorrect
// but hopefully rare. Fixing it will require significant
// restructuring of line layout.
// We might as well allow zero-width floats to be placed, though.
availableWidth = 0;
}
placedFloat = AddFloat(outOfFlowFrame, availableWidth);
NS_ASSERTION(!(outOfFlowFrame->GetType() == nsGkAtoms::letterFrame &&
GetFirstLetterStyleOK()),
"FirstLetterStyle set on line with floating first letter");
}
}
else if (isText) {
// Note non-empty text-frames for inline frame compatibility hackery
pfd->SetFlag(PFD_ISTEXTFRAME, true);
nsTextFrame* textFrame = static_cast<nsTextFrame*>(pfd->mFrame);
isEmpty = !textFrame->HasNoncollapsedCharacters();
if (!isEmpty) {
pfd->SetFlag(PFD_ISNONEMPTYTEXTFRAME, true);
nsIContent* content = textFrame->GetContent();
const nsTextFragment* frag = content->GetText();
if (frag) {
pfd->SetFlag(PFD_ISNONWHITESPACETEXTFRAME,
!content->TextIsOnlyWhitespace());
}
}
}
else if (nsGkAtoms::brFrame == frameType) {
pfd->SetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE, true);
isEmpty = false;
} else {
if (nsGkAtoms::letterFrame==frameType) {
pfd->SetFlag(PFD_ISLETTERFRAME, true);
}
if (pfd->mSpan) {
isEmpty = !pfd->mSpan->mHasNonemptyContent && pfd->mFrame->IsSelfEmpty();
} else {
isEmpty = pfd->mFrame->IsEmpty();
}
}
}
mFloatManager->Translate(-tx, -ty);
NS_ASSERTION(metrics.width>=0, "bad width");
NS_ASSERTION(metrics.height>=0,"bad height");
if (metrics.width<0) metrics.width=0;
if (metrics.height<0) metrics.height=0;
#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 ((metrics.width == nscoord(0xdeadbeef)) ||
(metrics.height == nscoord(0xdeadbeef))) {
printf("nsLineLayout: ");
nsFrame::ListTag(stdout, aFrame);
printf(" didn't set w/h %d,%d!\n", metrics.width, metrics.height);
}
}
#endif
// Unlike with non-inline reflow, the overflow area here does *not*
// include the accumulation of the frame's bounds and its inline
// descendants' bounds. Nor does it include the outline area; it's
// just the union of the bounds of any absolute children. That is
// added in later by nsLineLayout::ReflowInlineFrames.
pfd->mOverflowAreas = metrics.mOverflowAreas;
pfd->mBounds.width = metrics.width;
pfd->mBounds.height = metrics.height;
// Size the frame, but |RelativePositionFrames| will size the view.
aFrame->SetSize(nsSize(metrics.width, metrics.height));
// Tell the frame that we're done reflowing it
aFrame->DidReflow(mPresContext,
isText ? nullptr : reflowStateHolder.addr(),
NS_FRAME_REFLOW_FINISHED);
if (aMetrics) {
*aMetrics = metrics;
}
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();
if (nullptr != 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)
nsContainerFrame* parent = static_cast<nsContainerFrame*>
(kidNextInFlow->GetParent());
parent->DeleteNextInFlowChild(mPresContext, kidNextInFlow, true);
}
}
// Check whether this frame breaks up text runs. All frames break up text
// runs (hence return false here) except for text frames and inline containers.
bool continuingTextRun = aFrame->CanContinueTextRun();
// Clear any residual mTrimmableWidth if this isn't a text frame
if (!continuingTextRun && !pfd->GetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE)) {
mTrimmableWidth = 0;
}
// See if we can place the frame. If we can't fit it, then we
// return now.
bool optionalBreakAfterFits;
NS_ASSERTION(isText ||
!reflowStateHolder.ref().IsFloating(),
"How'd we get a floated inline frame? "
"The frame ctor should've dealt with this.");
// Direction is inherited, so using the psd direction is fine.
// Get it off the reflow state instead of the frame to save style
// data computation (especially for the text).
uint8_t direction =
isText ? psd->mReflowState->mStyleVisibility->mDirection :
reflowStateHolder.ref().mStyleVisibility->mDirection;
if (CanPlaceFrame(pfd, direction, notSafeToBreak, continuingTextRun,
savedOptionalBreakContent != nullptr, metrics,
aReflowStatus, &optionalBreakAfterFits)) {
if (!isEmpty) {
psd->mHasNonemptyContent = true;
mLineIsEmpty = false;
if (!pfd->mSpan) {
// nonempty leaf content has been placed
mLineAtStart = false;
}
}
// 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);
}
if (!continuingTextRun) {
if (!psd->mNoWrap && (!LineIsEmpty() || placedFloat)) {
// record soft break opportunity after this content that can't be
// part of a text run. This is not a text frame so we know
// that offset INT32_MAX means "after the content".
if (NotifyOptionalBreakPosition(aFrame->GetContent(), INT32_MAX, optionalBreakAfterFits, eNormalBreak)) {
// If this returns true then we are being told to actually break here.
aReflowStatus = NS_INLINE_LINE_BREAK_AFTER(aReflowStatus);
}
}
}
}
else {
PushFrame(aFrame);
aPushedFrame = true;
// Undo any saved break positions that the frame might have told us about,
// since we didn't end up placing it
RestoreSavedBreakPosition(savedOptionalBreakContent,
savedOptionalBreakOffset,
savedOptionalBreakPriority);
}
}
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::ApplyStartMargin(PerFrameData* pfd,
nsHTMLReflowState& aReflowState)
{
NS_ASSERTION(!aReflowState.IsFloating(),
"How'd we get a floated inline frame? "
"The frame ctor should've dealt with this.");
// XXXwaterson probably not the right way to get this; e.g., embeddings, etc.
bool ltr = (NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection);
// Only apply start-margin on the first-in flow for inline frames,
// and make sure to not apply it to any inline other than the first
// in an ib split. Note that the ib special sibling annotations
// only live on the first continuation, but we don't want to apply
// the start margin for later continuations anyway.
if (pfd->mFrame->GetPrevContinuation() ||
nsLayoutUtils::FrameIsNonFirstInIBSplit(pfd->mFrame)) {
// Zero this out so that when we compute the max-element-width of
// the frame we will properly avoid adding in the starting margin.
if (ltr)
pfd->mMargin.left = 0;
else
pfd->mMargin.right = 0;
}
else {
pfd->mBounds.x += ltr ? pfd->mMargin.left : pfd->mMargin.right;
NS_WARN_IF_FALSE(NS_UNCONSTRAINEDSIZE != aReflowState.availableWidth,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
if (NS_UNCONSTRAINEDSIZE == aReflowState.ComputedWidth()) {
// For inline-ish and text-ish things (which don't compute widths
// in the reflow state), adjust available width to account for the
// left margin. The right margin will be accounted for when we
// finish flowing the frame.
aReflowState.availableWidth -= ltr ? pfd->mMargin.left : pfd->mMargin.right;
}
}
}
nscoord
nsLineLayout::GetCurrentFrameXDistanceFromBlock()
{
PerSpanData* psd;
nscoord x = 0;
for (psd = mCurrentSpan; psd; psd = psd->mParent) {
x += psd->mX;
}
return x;
}
/**
* 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.
*/
bool
nsLineLayout::CanPlaceFrame(PerFrameData* pfd,
uint8_t aFrameDirection,
bool aNotSafeToBreak,
bool aFrameCanContinueTextRun,
bool aCanRollBackBeforeFrame,
nsHTMLReflowMetrics& aMetrics,
nsReflowStatus& aStatus,
bool* aOptionalBreakAfterFits)
{
NS_PRECONDITION(pfd && pfd->mFrame, "bad args, null pointers for frame data");
*aOptionalBreakAfterFits = true;
// Compute right margin to use
if (0 != pfd->mBounds.width) {
// XXXwaterson this is probably not exactly right; e.g., embeddings, etc.
bool ltr = (NS_STYLE_DIRECTION_LTR == aFrameDirection);
/*
* We want to only apply the end margin if we're the last continuation and
* either not in an {ib} split or the last inline in it. In all other
* cases we want to zero it out. That means zeroing it out if any of these
* conditions hold:
* 1) The frame is not complete (in this case it will get a next-in-flow)
* 2) The frame is complete but has a non-fluid continuation on its
* continuation chain. Note that if it has a fluid continuation, that
* continuation will get destroyed later, so we don't want to drop the
* end-margin in that case.
* 3) The frame is in an {ib} split and is not the last part.
*
* However, none of that applies if this is a letter frame (XXXbz why?)
*/
if ((NS_FRAME_IS_NOT_COMPLETE(aStatus) ||
pfd->mFrame->GetLastInFlow()->GetNextContinuation() ||
nsLayoutUtils::FrameIsNonLastInIBSplit(pfd->mFrame))
&& !pfd->GetFlag(PFD_ISLETTERFRAME)) {
if (ltr)
pfd->mMargin.right = 0;
else
pfd->mMargin.left = 0;
}
}
else {
// Don't apply margin to empty frames.
pfd->mMargin.left = pfd->mMargin.right = 0;
}
PerSpanData* psd = mCurrentSpan;
if (psd->mNoWrap) {
// When wrapping is off, everything fits.
return true;
}
bool ltr = NS_STYLE_DIRECTION_LTR == aFrameDirection;
nscoord endMargin = ltr ? pfd->mMargin.right : pfd->mMargin.left;
#ifdef NOISY_CAN_PLACE_FRAME
if (nullptr != 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() + endMargin - psd->mX);
#endif
// Set outside to true if the result of the reflow leads to the
// frame sticking outside of our available area.
bool outside = pfd->mBounds.XMost() - mTrimmableWidth + endMargin > psd->mRightEdge;
if (!outside) {
// If it fits, it fits
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> inside\n");
#endif
return true;
}
*aOptionalBreakAfterFits = false;
// 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 + pfd->mMargin.right) {
// Empty frames always fit right where they are
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> empty frame fits\n");
#endif
return true;
}
#ifdef FIX_BUG_50257
// another special case: always place a BR
if (nsGkAtoms::brFrame == pfd->mFrame->GetType()) {
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> BR frame fits\n");
#endif
return true;
}
#endif
if (aNotSafeToBreak) {
// There are no frames on the line that take up width and the line is
// not impacted by floats, so we must allow the current frame to be
// placed on the line
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> not-safe and not-impacted fits: ");
while (nullptr != psd) {
printf("<psd=%p x=%d left=%d> ", psd, psd->mX, psd->mLeftEdge);
psd = psd->mParent;
}
printf("\n");
#endif
return true;
}
// Special check for span frames
if (pfd->mSpan && pfd->mSpan->mContainsFloat) {
// If the span either directly or indirectly contains a float then
// it fits. Why? It's kind of complicated, but here goes:
//
// 1. CanPlaceFrame is used for all frame placements on a line,
// and in a span. This includes recursively placement of frames
// inside of spans, and the span itself. Because the logic always
// checks for room before proceeding (the code above here), the
// only things on a line will be those things that "fit".
//
// 2. Before a float is placed on a line, the line has to be empty
// (otherwise it's a "below current line" float and will be placed
// after the line).
//
// Therefore, if the span directly or indirectly has a float
// then it means that at the time of the placement of the float
// the line was empty. Because of #1, only the frames that fit can
// be added after that point, therefore we can assume that the
// current span being placed has fit.
//
// So how do we get here and have a span that should already fit
// and yet doesn't: Simple: span's that have the no-wrap attribute
// set on them and contain a float and are placed where they
// don't naturally fit.
return true;
}
if (aFrameCanContinueTextRun) {
// Let it fit, but we reserve the right to roll back.
// Note that we usually won't get here because a text frame will break
// itself to avoid exceeding the available width.
// We'll only get here for text frames that couldn't break early enough.
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> placing overflowing textrun, requesting backup\n");
#endif
// We will want to try backup.
mNeedBackup = true;
return true;
}
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> didn't fit\n");
#endif
aStatus = NS_INLINE_LINE_BREAK_BEFORE();
return 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;
bool emptyFrame = false;
if ((0 == pfd->mBounds.width) && (0 == pfd->mBounds.height)) {
pfd->mBounds.x = psd->mX;
pfd->mBounds.y = mTopEdge;
emptyFrame = true;
}
// Record ascent and update max-ascent and max-descent values
if (aMetrics.ascent == nsHTMLReflowMetrics::ASK_FOR_BASELINE)
pfd->mAscent = pfd->mFrame->GetBaseline();
else
pfd->mAscent = aMetrics.ascent;
bool ltr = (NS_STYLE_DIRECTION_LTR == pfd->mFrame->GetStyleVisibility()->mDirection);
// Advance to next X coordinate
psd->mX = pfd->mBounds.XMost() + (ltr ? pfd->mMargin.right : pfd->mMargin.left);
// Count the number of non-empty frames on the line...
if (!emptyFrame) {
mTotalPlacedFrames++;
}
}
nsresult
nsLineLayout::AddBulletFrame(nsIFrame* aFrame,
const nsHTMLReflowMetrics& aMetrics)
{
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
NS_ASSERTION(mGotLineBox, "must have line box");
nsIFrame *blockFrame = mBlockReflowState->frame;
NS_ASSERTION(blockFrame->IsFrameOfType(nsIFrame::eBlockFrame),
"must be for block");
if (!static_cast<nsBlockFrame*>(blockFrame)->BulletIsEmpty()) {
mHasBullet = true;
mLineBox->SetHasBullet();
}
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->mFlags = 0; // all flags default to false
pfd->SetFlag(PFD_ISBULLET, true);
if (aMetrics.ascent == nsHTMLReflowMetrics::ASK_FOR_BASELINE)
pfd->mAscent = aFrame->GetBaseline();
else
pfd->mAscent = aMetrics.ascent;
// Note: y value will be updated during vertical alignment
pfd->mBounds = aFrame->GetRect();
pfd->mOverflowAreas = aMetrics.mOverflowAreas;
}
return rv;
}
#ifdef DEBUG
void
nsLineLayout::DumpPerSpanData(PerSpanData* psd, int32_t aIndent)
{
nsFrame::IndentBy(stdout, aIndent);
printf("%p: left=%d x=%d right=%d\n", static_cast<void*>(psd),
psd->mLeftEdge, psd->mX, psd->mRightEdge);
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != 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::VerticalAlignLine()
{
// Synthesize a PerFrameData for the block frame
PerFrameData rootPFD;
rootPFD.mFrame = mBlockReflowState->frame;
rootPFD.mAscent = 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 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(" [line]==> 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
// (propagate it upward too)
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
if (pfd->mVerticalAlign == VALIGN_OTHER) {
pfd->mBounds.y += baselineY;
pfd->mFrame->SetRect(pfd->mBounds);
}
}
PlaceTopBottomFrames(psd, -mTopEdge, lineHeight);
// If the frame being reflowed has text decorations, we simulate the
// propagation of those decorations to a line-level element by storing the
// offset in a frame property on any child frames that are vertically-aligned
// somewhere other than the baseline. This property is then used by
// nsTextFrame::GetTextDecorations when the same conditions are met.
if (rootPFD.mFrame->GetStyleContext()->HasTextDecorationLines()) {
for (const PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
const nsIFrame *const f = pfd->mFrame;
if (f->VerticalAlignEnum() != NS_STYLE_VERTICAL_ALIGN_BASELINE) {
const nscoord offset = baselineY - pfd->mBounds.y;
f->Properties().Set(nsIFrame::LineBaselineOffset(),
NS_INT32_TO_PTR(offset));
}
}
}
// Fill in returned line-box and max-element-width data
mLineBox->mBounds.x = psd->mLeftEdge;
mLineBox->mBounds.y = mTopEdge;
mLineBox->mBounds.width = psd->mX - psd->mLeftEdge;
mLineBox->mBounds.height = lineHeight;
mFinalLineHeight = lineHeight;
mLineBox->SetAscent(baselineY - mTopEdge);
#ifdef NOISY_VERTICAL_ALIGN
printf(
" [line]==> bounds{x,y,w,h}={%d,%d,%d,%d} lh=%d a=%d\n",
mLineBox->mBounds.x, mLineBox->mBounds.y,
mLineBox->mBounds.width, mLineBox->mBounds.height,
mFinalLineHeight, mLineBox->GetAscent());
#endif
// Undo root-span mFrame pointer to prevent brane damage later on...
mRootSpan->mFrame = nullptr;
}
void
nsLineLayout::PlaceTopBottomFrames(PerSpanData* psd,
nscoord aDistanceFromTop,
nscoord aLineHeight)
{
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
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 - span->mMinY;
}
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 - span->mMaxY;
}
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);
}
}
}
#define VERTICAL_ALIGN_FRAMES_NO_MINIMUM nscoord_MAX
#define VERTICAL_ALIGN_FRAMES_NO_MAXIMUM nscoord_MIN
// 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* spanFramePFD = psd->mFrame;
nsIFrame* spanFrame = spanFramePFD->mFrame;
// Get the parent frame's font for all of the frames in this span
nsRefPtr<nsFontMetrics> fm;
float inflation =
nsLayoutUtils::FontSizeInflationInner(spanFrame, mInflationMinFontSize);
nsLayoutUtils::GetFontMetricsForFrame(spanFrame, getter_AddRefs(fm),
inflation);
mBlockReflowState->rendContext->SetFont(fm);
bool preMode = mStyleText->WhiteSpaceIsSignificant();
// See if the span is an empty continuation. It's an empty continuation iff:
// - it has a prev-in-flow
// - it has no next in flow
// - it's zero sized
bool emptyContinuation = psd != mRootSpan &&
spanFrame->GetPrevInFlow() && !spanFrame->GetNextInFlow() &&
(0 == spanFramePFD->mBounds.width) && (0 == spanFramePFD->mBounds.height);
#ifdef NOISY_VERTICAL_ALIGN
printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
nsFrame::ListTag(stdout, spanFrame);
printf(": preMode=%s strictMode=%s w/h=%d,%d emptyContinuation=%s",
preMode ? "yes" : "no",
mPresContext->CompatibilityMode() != eCompatibility_NavQuirks ? "yes" : "no",
spanFramePFD->mBounds.width, spanFramePFD->mBounds.height,
emptyContinuation ? "yes" : "no");
if (psd != mRootSpan) {
printf(" bp=%d,%d,%d,%d margin=%d,%d,%d,%d",
spanFramePFD->mBorderPadding.top,
spanFramePFD->mBorderPadding.right,
spanFramePFD->mBorderPadding.bottom,
spanFramePFD->mBorderPadding.left,
spanFramePFD->mMargin.top,
spanFramePFD->mMargin.right,
spanFramePFD->mMargin.bottom,
spanFramePFD->mMargin.left);
}
printf("\n");
#endif
// Compute the span's mZeroEffectiveSpanBox flag. What we are trying
// to determine is how we should treat the span: should it act
// "normally" according to css2 or should it effectively
// "disappear".
//
// In general, if the document being processed is in full standards
// mode then it should act normally (with one exception). The
// exception case is when a span is continued and yet the span is
// empty (e.g. compressed whitespace). For this kind of span we treat
// it as if it were not there so that it doesn't impact the
// line-height.
//
// In almost standards mode or quirks mode, we should sometimes make
// it disappear. The cases that matter are those where the span
// contains no real text elements that would provide an ascent and
// descent and height. However, if css style elements have been
// applied to the span (border/padding/margin) so that it's clear the
// document author is intending css2 behavior then we act as if strict
// mode is set.
//
// This code works correctly for preMode, because a blank line
// in PRE mode is encoded as a text node with a LF in it, since
// text nodes with only whitespace are considered in preMode.
//
// Much of this logic is shared with the various implementations of
// nsIFrame::IsEmpty since they need to duplicate the way it makes
// some lines empty. However, nsIFrame::IsEmpty can't be reused here
// since this code sets zeroEffectiveSpanBox even when there are
// non-empty children.
bool zeroEffectiveSpanBox = false;
// XXXldb If we really have empty continuations, then all these other
// checks don't make sense for them.
// XXXldb This should probably just use nsIFrame::IsSelfEmpty, assuming that
// it agrees with this code. (If it doesn't agree, it probably should.)
if ((emptyContinuation ||
mPresContext->CompatibilityMode() != eCompatibility_FullStandards) &&
((psd == mRootSpan) ||
((0 == spanFramePFD->mBorderPadding.top) &&
(0 == spanFramePFD->mBorderPadding.right) &&
(0 == spanFramePFD->mBorderPadding.bottom) &&
(0 == spanFramePFD->mBorderPadding.left) &&
(0 == spanFramePFD->mMargin.top) &&
(0 == spanFramePFD->mMargin.right) &&
(0 == spanFramePFD->mMargin.bottom) &&
(0 == spanFramePFD->mMargin.left)))) {
// This code handles an issue with compatibility with non-css
// conformant browsers. In particular, there are some cases
// where the font-size and line-height for a span must be
// ignored and instead the span must *act* as if it were zero
// sized. In general, if the span contains any non-compressed
// text then we don't use this logic.
// However, this is not propagated outwards, since (in compatibility
// mode) we don't want big line heights for things like
// <p><font size="-1">Text</font></p>
// We shouldn't include any whitespace that collapses, unless we're
// preformatted (in which case it shouldn't, but the width=0 test is
// perhaps incorrect). This includes whitespace at the beginning of
// a line and whitespace preceded (?) by other whitespace.
// See bug 134580 and bug 155333.
zeroEffectiveSpanBox = true;
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
if (pfd->GetFlag(PFD_ISTEXTFRAME) &&
(pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME) || preMode ||
pfd->mBounds.width != 0)) {
zeroEffectiveSpanBox = false;
break;
}
}
}
psd->mZeroEffectiveSpanBox = zeroEffectiveSpanBox;
// 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 = 0;
minY = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
maxY = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
#ifdef NOISY_VERTICAL_ALIGN
printf("[RootSpan]");
nsFrame::ListTag(stdout, spanFrame);
printf(": pass1 valign frames: topEdge=%d minLineHeight=%d zeroEffectiveSpanBox=%s\n",
mTopEdge, mMinLineHeight,
zeroEffectiveSpanBox ? "yes" : "no");
#endif
}
else {
// Compute the logical height for this span. The logical height
// is based on the line-height value, not the font-size. Also
// compute the top leading.
float inflation =
nsLayoutUtils::FontSizeInflationInner(spanFrame, mInflationMinFontSize);
nscoord logicalHeight = nsHTMLReflowState::
CalcLineHeight(spanFrame->GetStyleContext(),
mBlockReflowState->ComputedHeight(),
inflation);
nscoord contentHeight = spanFramePFD->mBounds.height -
spanFramePFD->mBorderPadding.top - spanFramePFD->mBorderPadding.bottom;
// Special-case for a ::first-letter frame, set the line height to
// the frame height if the user has left line-height == normal
if (spanFramePFD->GetFlag(PFD_ISLETTERFRAME) &&
!spanFrame->GetPrevInFlow() &&
spanFrame->GetStyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal) {
logicalHeight = spanFramePFD->mBounds.height;
}
nscoord leading = logicalHeight - contentHeight;
psd->mTopLeading = leading / 2;
psd->mBottomLeading = leading - psd->mTopLeading;
psd->mLogicalHeight = logicalHeight;
if (zeroEffectiveSpanBox) {
// When the span-box is to be ignored, zero out the initial
// values so that the span doesn't impact the final line
// height. The contents of the span can impact the final line
// height.
// Note that things are readjusted for this span after its children
// are reflowed
minY = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
maxY = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
}
else {
// 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 = spanFramePFD->mBorderPadding.top - psd->mTopLeading;
maxY = minY + psd->mLogicalHeight;
}
// This is the distance from the top edge of the parents visual
// box to the baseline. The span already computed this for us,
// so just use it.
*psd->mBaseline = baselineY = spanFramePFD->mAscent;
#ifdef NOISY_VERTICAL_ALIGN
printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
nsFrame::ListTag(stdout, spanFrame);
printf(": baseLine=%d logicalHeight=%d topLeading=%d h=%d bp=%d,%d zeroEffectiveSpanBox=%s\n",
baselineY, psd->mLogicalHeight, psd->mTopLeading,
spanFramePFD->mBounds.height,
spanFramePFD->mBorderPadding.top, spanFramePFD->mBorderPadding.bottom,
zeroEffectiveSpanBox ? "yes" : "no");
#endif
}
nscoord maxTopBoxHeight = 0;
nscoord maxBottomBoxHeight = 0;
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != pfd) {
nsIFrame* frame = pfd->mFrame;
// sanity check (see bug 105168, non-reproducible crashes from null frame)
NS_ASSERTION(frame, "null frame in PerFrameData - something is very very bad");
if (!frame) {
return;
}
// Compute the logical height of the frame
nscoord logicalHeight;
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;
}
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;
}
// Get vertical-align property
const nsStyleCoord& verticalAlign =
frame->GetStyleTextReset()->mVerticalAlign;
uint8_t verticalAlignEnum = frame->VerticalAlignEnum();
#ifdef NOISY_VERTICAL_ALIGN
printf(" [frame]");
nsFrame::ListTag(stdout, frame);
printf(": verticalAlignUnit=%d (enum == %d",
verticalAlign.GetUnit(),
((eStyleUnit_Enumerated == verticalAlign.GetUnit())
? verticalAlign.GetIntValue()
: -1));
if (verticalAlignEnum != nsIFrame::eInvalidVerticalAlign) {
printf(", after SVG dominant-baseline conversion == %d",
verticalAlignEnum);
}
printf(")\n");
#endif
if (verticalAlignEnum != nsIFrame::eInvalidVerticalAlign) {
switch (verticalAlignEnum) {
default:
case NS_STYLE_VERTICAL_ALIGN_BASELINE:
{
// The element's baseline is aligned with the baseline of
// the parent.
pfd->mBounds.y = baselineY - pfd->mAscent;
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.
nscoord parentSubscript = fm->SubscriptOffset();
nscoord revisedBaselineY = baselineY + parentSubscript;
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
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.
nscoord parentSuperscript = fm->SuperscriptOffset();
nscoord revisedBaselineY = baselineY - parentSuperscript;
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
pfd->mVerticalAlign = VALIGN_OTHER;
break;
}
case NS_STYLE_VERTICAL_ALIGN_TOP:
{
pfd->mVerticalAlign = VALIGN_TOP;
nscoord subtreeHeight = logicalHeight;
if (frameSpan) {
subtreeHeight = frameSpan->mMaxY - frameSpan->mMinY;
NS_ASSERTION(subtreeHeight >= logicalHeight,
"unexpected subtree height");
}
if (subtreeHeight > maxTopBoxHeight) {
maxTopBoxHeight = subtreeHeight;
}
break;
}
case NS_STYLE_VERTICAL_ALIGN_BOTTOM:
{
pfd->mVerticalAlign = VALIGN_BOTTOM;
nscoord subtreeHeight = logicalHeight;
if (frameSpan) {
subtreeHeight = frameSpan->mMaxY - frameSpan->mMinY;
NS_ASSERTION(subtreeHeight >= logicalHeight,
"unexpected subtree height");
}
if (subtreeHeight > maxBottomBoxHeight) {
maxBottomBoxHeight = subtreeHeight;
}
break;
}
case NS_STYLE_VERTICAL_ALIGN_MIDDLE:
{
// Align the midpoint of the frame with 1/2 the parents
// x-height above the baseline.
nscoord parentXHeight = fm->XHeight();
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 element's text.
nscoord parentAscent = fm->MaxAscent();
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.
nscoord parentDescent = fm->MaxDescent();
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;
}
case NS_STYLE_VERTICAL_ALIGN_MIDDLE_WITH_BASELINE:
{
// Align the midpoint of the frame with the baseline of the parent.
if (frameSpan) {
pfd->mBounds.y = baselineY - pfd->mBounds.height/2;
}
else {
pfd->mBounds.y = baselineY - logicalHeight/2 + pfd->mMargin.top;
}
pfd->mVerticalAlign = VALIGN_OTHER;
break;
}
}
} else {
// We have either a coord, a percent, or a calc().
nscoord pctBasis = 0;
if (verticalAlign.HasPercent()) {
// Percentages are like lengths, except treated as a percentage
// of the elements line-height value.
float inflation =
nsLayoutUtils::FontSizeInflationInner(frame, mInflationMinFontSize);
pctBasis = nsHTMLReflowState::CalcLineHeight(
frame->GetStyleContext(), mBlockReflowState->ComputedHeight(),
inflation);
}
nscoord offset =
nsRuleNode::ComputeCoordPercentCalc(verticalAlign, pctBasis);
// 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.
nscoord revisedBaselineY = baselineY - offset;
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
pfd->mVerticalAlign = VALIGN_OTHER;
}
// Update minY/maxY for frames that we just placed. Do not factor
// text into the equation.
if (pfd->mVerticalAlign == VALIGN_OTHER) {
// Text frames do not contribute to the min/max Y values for the
// line (instead their parent frame's font-size contributes).
// XXXrbs -- relax this restriction because it causes text frames
// to jam together when 'font-size-adjust' is enabled
// and layout is using dynamic font heights (bug 20394)
// -- Note #1: With this code enabled and with the fact that we are not
// using Em[Ascent|Descent] as nsDimensions for text metrics in
// GFX mean that the discussion in bug 13072 cannot hold.
// -- Note #2: We still don't want empty-text frames to interfere.
// For example in quirks mode, avoiding empty text frames prevents
// "tall" lines around elements like <hr> since the rules of <hr>
// in quirks.css have pseudo text contents with LF in them.
#if 0
if (!pfd->GetFlag(PFD_ISTEXTFRAME)) {
#else
// Only consider non empty text frames when line-height=normal
bool canUpdate = !pfd->GetFlag(PFD_ISTEXTFRAME);
if (!canUpdate && pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME)) {
canUpdate =
frame->GetStyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal;
}
if (canUpdate) {
#endif
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 (!preMode &&
mPresContext->CompatibilityMode() != eCompatibility_FullStandards &&
!logicalHeight) {
// Check if it's a BR frame that is not alone on its line (it
// is given a height of zero to indicate this), and if so reset
// yTop and yBottom so that BR frames don't influence the line.
if (nsGkAtoms::brFrame == frame->GetType()) {
yTop = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
yBottom = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
}
}
if (yTop < minY) minY = yTop;
if (yBottom > maxY) maxY = yBottom;
#ifdef NOISY_VERTICAL_ALIGN
printf(" [frame]raw: a=%d h=%d bp=%d,%d logical: h=%d leading=%d y=%d minY=%d maxY=%d\n",
pfd->mAscent, pfd->mBounds.height,
pfd->mBorderPadding.top, pfd->mBorderPadding.bottom,
logicalHeight,
frameSpan ? frameSpan->mTopLeading : 0,
pfd->mBounds.y, minY, maxY);
#endif
}
if (psd != mRootSpan) {
frame->SetRect(pfd->mBounds);
}
}
pfd = pfd->mNext;
}
// Factor in the minimum line-height when handling the root-span for
// the block.
if (psd == mRootSpan) {
// We should factor in the block element's minimum line-height (as
// defined in section 10.8.1 of the css2 spec) assuming that
// mZeroEffectiveSpanBox is not set on the root span. This only happens
// in some cases in quirks mode:
// (1) if the root span contains non-whitespace text directly (this
// is handled by mZeroEffectiveSpanBox
// (2) if this line has a bullet
// (3) if this is the last line of an LI, DT, or DD element
// (The last line before a block also counts, but not before a
// BR) (NN4/IE5 quirk)
// (1) and (2) above
bool applyMinLH = !psd->mZeroEffectiveSpanBox || mHasBullet;
bool isLastLine = (!mLineBox->IsLineWrapped() && !mLineEndsInBR);
if (!applyMinLH && isLastLine) {
nsIContent* blockContent = mRootSpan->mFrame->mFrame->GetContent();
if (blockContent) {
nsIAtom *blockTagAtom = blockContent->Tag();
// (3) above, if the last line of LI, DT, or DD
if (blockTagAtom == nsGkAtoms::li ||
blockTagAtom == nsGkAtoms::dt ||
blockTagAtom == nsGkAtoms::dd) {
applyMinLH = true;
}
}
}
if (applyMinLH) {
if (psd->mHasNonemptyContent || preMode || mHasBullet) {
#ifdef NOISY_VERTICAL_ALIGN
printf(" [span]==> adjusting min/maxY: currentValues: %d,%d", minY, maxY);
#endif
nscoord minimumLineHeight = mMinLineHeight;
nscoord yTop =
-nsLayoutUtils::GetCenteredFontBaseline(fm, minimumLineHeight);
nscoord yBottom = yTop + minimumLineHeight;
if (yTop < minY) minY = yTop;
if (yBottom > maxY) maxY = yBottom;
#ifdef NOISY_VERTICAL_ALIGN
printf(" new values: %d,%d\n", minY, maxY);
#endif
#ifdef NOISY_VERTICAL_ALIGN
printf(" Used mMinLineHeight: %d, yTop: %d, yBottom: %d\n", mMinLineHeight, yTop, yBottom);
#endif
}
else {
// XXX issues:
// [1] BR's on empty lines stop working
// [2] May not honor css2's notion of handling empty elements
// [3] blank lines in a pre-section ("\n") (handled with preMode)
// XXX Are there other problems with this?
#ifdef NOISY_VERTICAL_ALIGN
printf(" [span]==> zapping min/maxY: currentValues: %d,%d newValues: 0,0\n",
minY, maxY);
#endif
minY = maxY = 0;
}
}
}
if ((minY == VERTICAL_ALIGN_FRAMES_NO_MINIMUM) ||
(maxY == VERTICAL_ALIGN_FRAMES_NO_MAXIMUM)) {
minY = maxY = baselineY;
}
if ((psd != mRootSpan) && (psd->mZeroEffectiveSpanBox)) {
#ifdef NOISY_VERTICAL_ALIGN
printf(" [span]adjusting for zeroEffectiveSpanBox\n");
printf(" Original: minY=%d, maxY=%d, height=%d, ascent=%d, logicalHeight=%d, topLeading=%d, bottomLeading=%d\n",
minY, maxY, spanFramePFD->mBounds.height,
spanFramePFD->mAscent,
psd->mLogicalHeight, psd->mTopLeading, psd->mBottomLeading);
#endif
nscoord goodMinY = spanFramePFD->mBorderPadding.top - psd->mTopLeading;
nscoord goodMaxY = goodMinY + psd->mLogicalHeight;
// For cases like the one in bug 714519 (text-decoration placement
// or making nsLineLayout::IsZeroHeight() handle
// vertical-align:top/bottom on a descendant of the line that's not
// a child of it), we want to treat elements that are
// vertical-align: top or bottom somewhat like children for the
// purposes of this quirk. To some extent, this is guessing, since
// they might end up being aligned anywhere. However, we'll guess
// that they'll be placed aligned with the top or bottom of this
// frame (as though this frame is the only thing in the line).
// (Guessing isn't crazy, since all we're doing is reducing the
// scope of a quirk and making the behavior more standards-like.)
if (maxTopBoxHeight > maxY - minY) {
// Distribute maxTopBoxHeight to ascent (baselineY - minY), and
// then to descent (maxY - baselineY) by adjusting minY or maxY,
// but not to exceed goodMinY and goodMaxY.
nscoord distribute = maxTopBoxHeight - (maxY - minY);
nscoord ascentSpace = NS_MAX(minY - goodMinY, 0);
if (distribute > ascentSpace) {
distribute -= ascentSpace;
minY -= ascentSpace;
nscoord descentSpace = NS_MAX(goodMaxY - maxY, 0);
if (distribute > descentSpace) {
maxY += descentSpace;
} else {
maxY += distribute;
}
} else {
minY -= distribute;
}
}
if (maxBottomBoxHeight > maxY - minY) {
// Likewise, but preferring descent to ascent.
nscoord distribute = maxBottomBoxHeight - (maxY - minY);
nscoord descentSpace = NS_MAX(goodMaxY - maxY, 0);
if (distribute > descentSpace) {
distribute -= descentSpace;
maxY += descentSpace;
nscoord ascentSpace = NS_MAX(minY - goodMinY, 0);
if (distribute > ascentSpace) {
minY -= ascentSpace;
} else {
minY -= distribute;
}
} else {
maxY += distribute;
}
}
if (minY > goodMinY) {
nscoord adjust = minY - goodMinY; // positive
// shrink the logical extents
psd->mLogicalHeight -= adjust;
psd->mTopLeading -= adjust;
}
if (maxY < goodMaxY) {
nscoord adjust = goodMaxY - maxY;
psd->mLogicalHeight -= adjust;
psd->mBottomLeading -= adjust;
}
if (minY > 0) {
// shrink the content by moving its top down. This is tricky, since
// the top is the 0 for many coordinates, so what we do is
// move everything else up.
spanFramePFD->mAscent -= minY; // move the baseline up
spanFramePFD->mBounds.height -= minY; // move the bottom up
psd->mTopLeading += minY;
*psd->mBaseline -= minY;
pfd = psd->mFirstFrame;
while (nullptr != pfd) {
pfd->mBounds.y -= minY; // move all the children back up
pfd->mFrame->SetRect(pfd->mBounds);
pfd = pfd->mNext;
}
maxY -= minY; // since minY is in the frame's own coordinate system
minY = 0;
}
if (maxY < spanFramePFD->mBounds.height) {
nscoord adjust = spanFramePFD->mBounds.height - maxY;
spanFramePFD->mBounds.height -= adjust; // move the bottom up
psd->mBottomLeading += adjust;
}
#ifdef NOISY_VERTICAL_ALIGN
printf(" New: minY=%d, maxY=%d, height=%d, ascent=%d, logicalHeight=%d, topLeading=%d, bottomLeading=%d\n",
minY, maxY, spanFramePFD->mBounds.height,
spanFramePFD->mAscent,
psd->mLogicalHeight, psd->mTopLeading, psd->mBottomLeading);
#endif
}
psd->mMinY = minY;
psd->mMaxY = maxY;
#ifdef NOISY_VERTICAL_ALIGN
printf(" [span]==> 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;
}
}
static void SlideSpanFrameRect(nsIFrame* aFrame, nscoord aDeltaWidth)
{
nsRect r = aFrame->GetRect();
r.x -= aDeltaWidth;
aFrame->SetRect(r);
}
bool
nsLineLayout::TrimTrailingWhiteSpaceIn(PerSpanData* psd,
nscoord* aDeltaWidth)
{
#ifndef IBMBIDI
// XXX what about NS_STYLE_DIRECTION_RTL?
if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
*aDeltaWidth = 0;
return true;
}
#endif
PerFrameData* pfd = psd->mFirstFrame;
if (!pfd) {
*aDeltaWidth = 0;
return false;
}
pfd = pfd->Last();
while (nullptr != pfd) {
#ifdef REALLY_NOISY_TRIM
nsFrame::ListTag(stdout, (psd == mRootSpan
? mBlockReflowState->frame
: psd->mFrame->mFrame));
printf(": attempting trim of ");
nsFrame::ListTag(stdout, pfd->mFrame);
printf("\n");
#endif
PerSpanData* childSpan = pfd->mSpan;
if (childSpan) {
// Maybe the child span has the trailing white-space in it?
if (TrimTrailingWhiteSpaceIn(childSpan, aDeltaWidth)) {
nscoord deltaWidth = *aDeltaWidth;
if (deltaWidth) {
// Adjust the child spans frame size
pfd->mBounds.width -= deltaWidth;
if (psd != mRootSpan) {
// When the child span is not a direct child of the block
// we need to update the child spans frame rectangle
// because it most likely will not be done again. Spans
// that are direct children of the block will be updated
// later, however, because the VerticalAlignFrames method
// will be run after this method.
nsIFrame* f = pfd->mFrame;
nsRect r = f->GetRect();
r.width -= deltaWidth;
f->SetRect(r);
}
// Adjust the right edge of the span that contains the child span
psd->mX -= deltaWidth;
// Slide any frames that follow the child span over by the
// right amount. The only thing that can follow the child
// span is empty stuff, so we are just making things
// sensible (keeping the combined area honest).
while (pfd->mNext) {
pfd = pfd->mNext;
pfd->mBounds.x -= deltaWidth;
if (psd != mRootSpan) {
// When the child span is not a direct child of the block
// we need to update the child spans frame rectangle
// because it most likely will not be done again. Spans
// that are direct children of the block will be updated
// later, however, because the VerticalAlignFrames method
// will be run after this method.
SlideSpanFrameRect(pfd->mFrame, deltaWidth);
}
}
}
return true;
}
}
else if (!pfd->GetFlag(PFD_ISTEXTFRAME) &&
!pfd->GetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE)) {
// If we hit a frame on the end that's not text and not a placeholder,
// then there is no trailing whitespace to trim. Stop the search.
*aDeltaWidth = 0;
return true;
}
else if (pfd->GetFlag(PFD_ISTEXTFRAME)) {
// Call TrimTrailingWhiteSpace even on empty textframes because they
// might have a soft hyphen which should now appear, changing the frame's
// width
nsTextFrame::TrimOutput trimOutput = static_cast<nsTextFrame*>(pfd->mFrame)->
TrimTrailingWhiteSpace(mBlockReflowState->rendContext);
#ifdef NOISY_TRIM
nsFrame::ListTag(stdout, (psd == mRootSpan
? mBlockReflowState->frame
: psd->mFrame->mFrame));
printf(": trim of ");
nsFrame::ListTag(stdout, pfd->mFrame);
printf(" returned %d\n", trimOutput.mDeltaWidth);
#endif
if (trimOutput.mLastCharIsJustifiable && pfd->mJustificationNumSpaces > 0) {
pfd->mJustificationNumSpaces--;
}
if (trimOutput.mChanged) {
pfd->SetFlag(PFD_RECOMPUTEOVERFLOW, true);
}
if (trimOutput.mDeltaWidth) {
pfd->mBounds.width -= trimOutput.mDeltaWidth;
// See if the text frame has already been placed in its parent
if (psd != mRootSpan) {
// The frame was already placed during psd's
// reflow. Update the frames rectangle now.
pfd->mFrame->SetRect(pfd->mBounds);
}
// Adjust containing span's right edge
psd->mX -= trimOutput.mDeltaWidth;
// Slide any frames that follow the text frame over by the
// right amount. The only thing that can follow the text
// frame is empty stuff, so we are just making things
// sensible (keeping the combined area honest).
while (pfd->mNext) {
pfd = pfd->mNext;
pfd->mBounds.x -= trimOutput.mDeltaWidth;
if (psd != mRootSpan) {
// When the child span is not a direct child of the block
// we need to update the child spans frame rectangle
// because it most likely will not be done again. Spans
// that are direct children of the block will be updated
// later, however, because the VerticalAlignFrames method
// will be run after this method.
SlideSpanFrameRect(pfd->mFrame, trimOutput.mDeltaWidth);
}
}
}
if (pfd->GetFlag(PFD_ISNONEMPTYTEXTFRAME) || trimOutput.mChanged) {
// Pass up to caller so they can shrink their span
*aDeltaWidth = trimOutput.mDeltaWidth;
return true;
}
}
pfd = pfd->mPrev;
}
*aDeltaWidth = 0;
return false;
}
bool
nsLineLayout::TrimTrailingWhiteSpace()
{
PerSpanData* psd = mRootSpan;
nscoord deltaWidth;
TrimTrailingWhiteSpaceIn(psd, &deltaWidth);
return 0 != deltaWidth;
}
void
nsLineLayout::ComputeJustificationWeights(PerSpanData* aPSD,
int32_t* aNumSpaces,
int32_t* aNumLetters)
{
NS_ASSERTION(aPSD, "null arg");
NS_ASSERTION(aNumSpaces, "null arg");
NS_ASSERTION(aNumLetters, "null arg");
int32_t numSpaces = 0;
int32_t numLetters = 0;
for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nullptr; pfd = pfd->mNext) {
if (true == pfd->GetFlag(PFD_ISTEXTFRAME)) {
numSpaces += pfd->mJustificationNumSpaces;
numLetters += pfd->mJustificationNumLetters;
}
else if (pfd->mSpan != nullptr) {
int32_t spanSpaces;
int32_t spanLetters;
ComputeJustificationWeights(pfd->mSpan, &spanSpaces, &spanLetters);
numSpaces += spanSpaces;
numLetters += spanLetters;
}
}
*aNumSpaces = numSpaces;
*aNumLetters = numLetters;
}
nscoord
nsLineLayout::ApplyFrameJustification(PerSpanData* aPSD, FrameJustificationState* aState)
{
NS_ASSERTION(aPSD, "null arg");
NS_ASSERTION(aState, "null arg");
nscoord deltaX = 0;
for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nullptr; pfd = pfd->mNext) {
// Don't reposition bullets (and other frames that occur out of X-order?)
if (!pfd->GetFlag(PFD_ISBULLET)) {
nscoord dw = 0;
pfd->mBounds.x += deltaX;
if (true == pfd->GetFlag(PFD_ISTEXTFRAME)) {
if (aState->mTotalWidthForSpaces > 0 &&
aState->mTotalNumSpaces > 0) {
aState->mNumSpacesProcessed += pfd->mJustificationNumSpaces;
nscoord newAllocatedWidthForSpaces =
(aState->mTotalWidthForSpaces*aState->mNumSpacesProcessed)
/aState->mTotalNumSpaces;
dw += newAllocatedWidthForSpaces - aState->mWidthForSpacesProcessed;
aState->mWidthForSpacesProcessed = newAllocatedWidthForSpaces;
}
if (aState->mTotalWidthForLetters > 0 &&
aState->mTotalNumLetters > 0) {
aState->mNumLettersProcessed += pfd->mJustificationNumLetters;
nscoord newAllocatedWidthForLetters =
(aState->mTotalWidthForLetters*aState->mNumLettersProcessed)
/aState->mTotalNumLetters;
dw += newAllocatedWidthForLetters - aState->mWidthForLettersProcessed;
aState->mWidthForLettersProcessed = newAllocatedWidthForLetters;
}
if (dw) {
pfd->SetFlag(PFD_RECOMPUTEOVERFLOW, true);
}
}
else {
if (nullptr != pfd->mSpan) {
dw += ApplyFrameJustification(pfd->mSpan, aState);
}
}
pfd->mBounds.width += dw;
deltaX += dw;
pfd->mFrame->SetRect(pfd->mBounds);
}
}
return deltaX;
}
void
nsLineLayout::HorizontalAlignFrames(nsRect& aLineBounds,
bool aIsLastLine)
{
/**
* NOTE: aIsLastLine ain't necessarily so: it is correctly set by caller
* only in cases where the last line needs special handling.
*/
PerSpanData* psd = mRootSpan;
NS_WARN_IF_FALSE(psd->mRightEdge != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
nscoord availWidth = psd->mRightEdge - psd->mLeftEdge;
nscoord remainingWidth = availWidth - aLineBounds.width;
#ifdef NOISY_HORIZONTAL_ALIGN
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": availWidth=%d lineWidth=%d delta=%d\n",
availWidth, aLineBounds.width, remainingWidth);
#endif
nscoord dx = 0;
if (remainingWidth > 0 &&
!(mBlockReflowState->frame->IsSVGText())) {
uint8_t textAlign = mStyleText->mTextAlign;
/*
* 'text-align-last: auto' is equivalent to the value of the 'text-align'
* property except when 'text-align' is set to 'justify', in which case it
* is 'justify' when 'text-justify' is 'distribute' and 'start' otherwise.
*
* XXX: the code below will have to change when we implement text-justify
*/
if (aIsLastLine) {
if (mStyleText->mTextAlignLast == NS_STYLE_TEXT_ALIGN_AUTO) {
if (textAlign == NS_STYLE_TEXT_ALIGN_JUSTIFY) {
textAlign = NS_STYLE_TEXT_ALIGN_DEFAULT;
}
} else {
textAlign = mStyleText->mTextAlignLast;
}
}
switch (textAlign) {
case NS_STYLE_TEXT_ALIGN_JUSTIFY:
int32_t numSpaces;
int32_t numLetters;
ComputeJustificationWeights(psd, &numSpaces, &numLetters);
if (numSpaces > 0) {
FrameJustificationState state =
{ numSpaces, numLetters, remainingWidth, 0, 0, 0, 0, 0 };
// Apply the justification, and make sure to update our linebox
// width to account for it.
aLineBounds.width += ApplyFrameJustification(psd, &state);
remainingWidth = availWidth - aLineBounds.width;
break;
}
// Fall through to the default case if we could not justify to fill
// the space.
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_END:
if (NS_STYLE_DIRECTION_LTR == psd->mDirection) {
// Do what we do for ALIGN_RIGHT
dx = remainingWidth;
break;
}
// Fall through to align left case for end alignment
// used when the direction is right-to-left.
case NS_STYLE_TEXT_ALIGN_LEFT:
case NS_STYLE_TEXT_ALIGN_MOZ_LEFT:
break;
case NS_STYLE_TEXT_ALIGN_CENTER:
case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
dx = remainingWidth / 2;
break;
}
}
else if (remainingWidth < 0) {
if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
dx = remainingWidth;
psd->mX += dx;
psd->mLeftEdge += dx;
}
}
if (NS_STYLE_DIRECTION_RTL == psd->mDirection &&
!psd->mChangedFrameDirection) {
if (psd->mLastFrame->GetFlag(PFD_ISBULLET) ) {
PerFrameData* bulletPfd = psd->mLastFrame;
bulletPfd->mBounds.x -= remainingWidth;
bulletPfd->mFrame->SetRect(bulletPfd->mBounds);
}
psd->mChangedFrameDirection = true;
}
if (dx) {
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
pfd->mBounds.x += dx;
pfd->mFrame->SetRect(pfd->mBounds);
}
aLineBounds.x += dx;
}
}
void
nsLineLayout::RelativePositionFrames(nsOverflowAreas& aOverflowAreas)
{
RelativePositionFrames(mRootSpan, aOverflowAreas);
}
void
nsLineLayout::RelativePositionFrames(PerSpanData* psd, nsOverflowAreas& aOverflowAreas)
{
nsOverflowAreas overflowAreas;
if (nullptr != psd->mFrame) {
// The span's overflow areas come in three parts:
// -- this frame's width and height
// -- pfd->mOverflowAreas, which is the area of a bullet or the union
// of a relatively positioned frame's absolute children
// -- the bounds of all inline descendants
// The former two parts are computed right here, we gather the descendants
// below.
// At this point psd->mFrame->mBounds might be out of date since
// bidi reordering can move and resize the frames. So use the frame's
// rect instead of mBounds.
nsRect adjustedBounds(nsPoint(0, 0), psd->mFrame->mFrame->GetSize());
overflowAreas.ScrollableOverflow().UnionRect(
psd->mFrame->mOverflowAreas.ScrollableOverflow(), adjustedBounds);
overflowAreas.VisualOverflow().UnionRect(
psd->mFrame->mOverflowAreas.VisualOverflow(), adjustedBounds);
}
else {
// The minimum combined area for the frames that are direct
// children of the block starts at the upper left corner of the
// line and is sized to match the size of the line's bounding box
// (the same size as the values returned from VerticalAlignFrames)
overflowAreas.VisualOverflow().x = psd->mLeftEdge;
// If this turns out to be negative, the rect will be treated as empty.
// Which is just fine.
overflowAreas.VisualOverflow().width =
psd->mX - overflowAreas.VisualOverflow().x;
overflowAreas.VisualOverflow().y = mTopEdge;
overflowAreas.VisualOverflow().height = mFinalLineHeight;
overflowAreas.ScrollableOverflow() = overflowAreas.VisualOverflow();
}
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
nsIFrame* frame = pfd->mFrame;
nsPoint origin = frame->GetPosition();
// Adjust the origin of the frame
if (pfd->GetFlag(PFD_RELATIVEPOS)) {
// right and bottom are handled by
// nsHTMLReflowState::ComputeRelativeOffsets
nsPoint change(pfd->mOffsets.left, pfd->mOffsets.top);
origin += change;
frame->SetPosition(origin);
}
// We must position the view correctly before positioning its
// descendants so that widgets are positioned properly (since only
// some views have widgets).
if (frame->HasView())
nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame,
frame->GetView(), pfd->mOverflowAreas.VisualOverflow(),
NS_FRAME_NO_SIZE_VIEW);
// 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.
nsOverflowAreas r;
if (pfd->mSpan) {
// Compute a new combined area for the child span before
// aggregating it into our combined area.
RelativePositionFrames(pfd->mSpan, r);
} else {
r = pfd->mOverflowAreas;
if (pfd->GetFlag(PFD_ISTEXTFRAME)) {
// We need to recompute overflow areas in two cases:
// (1) When PFD_RECOMPUTEOVERFLOW is set due to trimming
// (2) When there are text decorations, since we can't recompute the
// overflow area until Reflow and VerticalAlignLine have finished
if (pfd->GetFlag(PFD_RECOMPUTEOVERFLOW) ||
frame->GetStyleContext()->HasTextDecorationLines()) {
nsTextFrame* f = static_cast<nsTextFrame*>(frame);
r = f->RecomputeOverflow(*mBlockReflowState);
}
frame->FinishAndStoreOverflow(r, frame->GetSize());
}
// If we have something that's not an inline but with a complex frame
// hierarchy inside that contains views, they need to be
// positioned.
// All descendant views must be repositioned even if this frame
// does have a view in case this frame's view does not have a
// widget and some of the descendant views do have widgets --
// otherwise the widgets won't be repositioned.
nsContainerFrame::PositionChildViews(frame);
}
// Do this here (rather than along with setting the overflow rect
// below) so we get leaf frames as well. No need to worry
// about the root span, since it doesn't have a frame.
if (frame->HasView())
nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame,
frame->GetView(),
r.VisualOverflow(),
NS_FRAME_NO_MOVE_VIEW);
overflowAreas.UnionWith(r + origin);
}
// If we just computed a spans combined area, we need to update its
// overflow rect...
if (psd->mFrame) {
PerFrameData* spanPFD = psd->mFrame;
nsIFrame* frame = spanPFD->mFrame;
frame->FinishAndStoreOverflow(overflowAreas, frame->GetSize());
}
aOverflowAreas = overflowAreas;
}
Reference in New Issue View Git Blame Copy Permalink