blob: c6f1bd88dbd9bbe1d7c78e462c218d4a5f5f6913 [file] [log] [blame]
/*
* Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "RootInlineBox.h"
#include "BidiResolver.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "Document.h"
#include "EllipsisBox.h"
#include "Frame.h"
#include "GraphicsContext.h"
#include "HitTestResult.h"
#include "InlineTextBox.h"
#include "Page.h"
#include "PaintInfo.h"
#include "RenderArena.h"
#include "RenderBlock.h"
#include "VerticalPositionCache.h"
using namespace std;
namespace WebCore {
typedef WTF::HashMap<const RootInlineBox*, EllipsisBox*> EllipsisBoxMap;
static EllipsisBoxMap* gEllipsisBoxMap = 0;
RootInlineBox::RootInlineBox(RenderBlock* block)
: InlineFlowBox(block)
, m_lineBreakObj(0)
, m_lineBreakPos(0)
, m_lineTop(0)
, m_lineBottom(0)
, m_paginationStrut(0)
, m_blockLogicalHeight(0)
, m_baselineType(AlphabeticBaseline)
, m_hasAnnotationsBefore(false)
, m_hasAnnotationsAfter(false)
{
setIsHorizontal(block->isHorizontalWritingMode());
}
void RootInlineBox::destroy(RenderArena* arena)
{
detachEllipsisBox(arena);
InlineFlowBox::destroy(arena);
}
void RootInlineBox::detachEllipsisBox(RenderArena* arena)
{
if (hasEllipsisBox()) {
EllipsisBox* box = gEllipsisBoxMap->take(this);
box->setParent(0);
box->destroy(arena);
setHasEllipsisBox(false);
}
}
RenderLineBoxList* RootInlineBox::rendererLineBoxes() const
{
return block()->lineBoxes();
}
void RootInlineBox::clearTruncation()
{
if (hasEllipsisBox()) {
detachEllipsisBox(renderer()->renderArena());
InlineFlowBox::clearTruncation();
}
}
bool RootInlineBox::lineCanAccommodateEllipsis(bool ltr, int blockEdge, int lineBoxEdge, int ellipsisWidth)
{
// First sanity-check the unoverflowed width of the whole line to see if there is sufficient room.
int delta = ltr ? lineBoxEdge - blockEdge : blockEdge - lineBoxEdge;
if (logicalWidth() - delta < ellipsisWidth)
return false;
// Next iterate over all the line boxes on the line. If we find a replaced element that intersects
// then we refuse to accommodate the ellipsis. Otherwise we're ok.
return InlineFlowBox::canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth);
}
void RootInlineBox::placeEllipsis(const AtomicString& ellipsisStr, bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth,
InlineBox* markupBox)
{
// Create an ellipsis box.
EllipsisBox* ellipsisBox = new (renderer()->renderArena()) EllipsisBox(renderer(), ellipsisStr, this,
ellipsisWidth - (markupBox ? markupBox->logicalWidth() : 0), logicalHeight(),
y(), !prevRootBox(), isHorizontal(), markupBox);
if (!gEllipsisBoxMap)
gEllipsisBoxMap = new EllipsisBoxMap();
gEllipsisBoxMap->add(this, ellipsisBox);
setHasEllipsisBox(true);
// FIXME: Do we need an RTL version of this?
if (ltr && (x() + logicalWidth() + ellipsisWidth) <= blockRightEdge) {
ellipsisBox->m_x = x() + logicalWidth();
return;
}
// Now attempt to find the nearest glyph horizontally and place just to the right (or left in RTL)
// of that glyph. Mark all of the objects that intersect the ellipsis box as not painting (as being
// truncated).
bool foundBox = false;
ellipsisBox->m_x = placeEllipsisBox(ltr, blockLeftEdge, blockRightEdge, ellipsisWidth, foundBox);
}
float RootInlineBox::placeEllipsisBox(bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, bool& foundBox)
{
float result = InlineFlowBox::placeEllipsisBox(ltr, blockLeftEdge, blockRightEdge, ellipsisWidth, foundBox);
if (result == -1)
result = ltr ? blockRightEdge - ellipsisWidth : blockLeftEdge;
return result;
}
void RootInlineBox::paintEllipsisBox(PaintInfo& paintInfo, int tx, int ty) const
{
if (hasEllipsisBox() && paintInfo.shouldPaintWithinRoot(renderer()) && renderer()->style()->visibility() == VISIBLE
&& paintInfo.phase == PaintPhaseForeground)
ellipsisBox()->paint(paintInfo, tx, ty);
}
#if PLATFORM(MAC)
void RootInlineBox::addHighlightOverflow()
{
Frame* frame = renderer()->frame();
if (!frame)
return;
Page* page = frame->page();
if (!page)
return;
// Highlight acts as a selection inflation.
FloatRect rootRect(0, selectionTop(), logicalWidth(), selectionHeight());
IntRect inflatedRect = enclosingIntRect(page->chrome()->client()->customHighlightRect(renderer()->node(), renderer()->style()->highlight(), rootRect));
setOverflowFromLogicalRects(inflatedRect, inflatedRect);
}
void RootInlineBox::paintCustomHighlight(PaintInfo& paintInfo, int tx, int ty, const AtomicString& highlightType)
{
if (!paintInfo.shouldPaintWithinRoot(renderer()) || renderer()->style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseForeground)
return;
Frame* frame = renderer()->frame();
if (!frame)
return;
Page* page = frame->page();
if (!page)
return;
// Get the inflated rect so that we can properly hit test.
FloatRect rootRect(tx + x(), ty + selectionTop(), logicalWidth(), selectionHeight());
FloatRect inflatedRect = page->chrome()->client()->customHighlightRect(renderer()->node(), highlightType, rootRect);
if (inflatedRect.intersects(paintInfo.rect))
page->chrome()->client()->paintCustomHighlight(renderer()->node(), highlightType, rootRect, rootRect, false, true);
}
#endif
void RootInlineBox::paint(PaintInfo& paintInfo, int tx, int ty)
{
InlineFlowBox::paint(paintInfo, tx, ty);
paintEllipsisBox(paintInfo, tx, ty);
#if PLATFORM(MAC)
RenderStyle* styleToUse = renderer()->style(m_firstLine);
if (styleToUse->highlight() != nullAtom && !paintInfo.context->paintingDisabled())
paintCustomHighlight(paintInfo, tx, ty, styleToUse->highlight());
#endif
}
bool RootInlineBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty)
{
if (hasEllipsisBox() && visibleToHitTesting()) {
if (ellipsisBox()->nodeAtPoint(request, result, x, y, tx, ty)) {
renderer()->updateHitTestResult(result, IntPoint(x - tx, y - ty));
return true;
}
}
return InlineFlowBox::nodeAtPoint(request, result, x, y, tx, ty);
}
void RootInlineBox::adjustPosition(float dx, float dy)
{
InlineFlowBox::adjustPosition(dx, dy);
int blockDirectionDelta = isHorizontal() ? dy : dx; // The block direction delta will always be integral.
m_lineTop += blockDirectionDelta;
m_lineBottom += blockDirectionDelta;
m_blockLogicalHeight += blockDirectionDelta;
}
void RootInlineBox::childRemoved(InlineBox* box)
{
if (box->renderer() == m_lineBreakObj)
setLineBreakInfo(0, 0, BidiStatus());
for (RootInlineBox* prev = prevRootBox(); prev && prev->lineBreakObj() == box->renderer(); prev = prev->prevRootBox()) {
prev->setLineBreakInfo(0, 0, BidiStatus());
prev->markDirty();
}
}
int RootInlineBox::alignBoxesInBlockDirection(int heightOfBlock, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache)
{
#if ENABLE(SVG)
// SVG will handle vertical alignment on its own.
if (isSVGRootInlineBox())
return 0;
#endif
int maxPositionTop = 0;
int maxPositionBottom = 0;
int maxAscent = 0;
int maxDescent = 0;
bool setMaxAscent = false;
bool setMaxDescent = false;
// Figure out if we're in no-quirks mode.
bool noQuirksMode = renderer()->document()->inNoQuirksMode();
m_baselineType = requiresIdeographicBaseline(textBoxDataMap) ? IdeographicBaseline : AlphabeticBaseline;
computeLogicalBoxHeights(this, maxPositionTop, maxPositionBottom, maxAscent, maxDescent, setMaxAscent, setMaxDescent, noQuirksMode,
textBoxDataMap, baselineType(), verticalPositionCache);
if (maxAscent + maxDescent < max(maxPositionTop, maxPositionBottom))
adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
int maxHeight = maxAscent + maxDescent;
int lineTop = heightOfBlock;
int lineBottom = heightOfBlock;
int lineTopIncludingMargins = heightOfBlock;
int lineBottomIncludingMargins = heightOfBlock;
bool setLineTop = false;
bool hasAnnotationsBefore = false;
bool hasAnnotationsAfter = false;
placeBoxesInBlockDirection(heightOfBlock, maxHeight, maxAscent, noQuirksMode, lineTop, lineBottom, setLineTop,
lineTopIncludingMargins, lineBottomIncludingMargins, hasAnnotationsBefore, hasAnnotationsAfter, baselineType());
m_hasAnnotationsBefore = hasAnnotationsBefore;
m_hasAnnotationsAfter = hasAnnotationsAfter;
setLineTopBottomPositions(lineTop, lineBottom);
int annotationsAdjustment = beforeAnnotationsAdjustment();
if (annotationsAdjustment) {
// FIXME: Need to handle pagination here. We might have to move to the next page/column as a result of the
// ruby expansion.
adjustBlockDirectionPosition(annotationsAdjustment);
heightOfBlock += annotationsAdjustment;
}
maxHeight = max(0, maxHeight);
return heightOfBlock + maxHeight;
}
int RootInlineBox::beforeAnnotationsAdjustment() const
{
int result = 0;
if (!renderer()->style()->isFlippedLinesWritingMode()) {
// Annotations under the previous line may push us down.
if (prevRootBox() && prevRootBox()->hasAnnotationsAfter())
result = prevRootBox()->computeUnderAnnotationAdjustment(lineTop());
if (!hasAnnotationsBefore())
return result;
// Annotations over this line may push us further down.
int highestAllowedPosition = prevRootBox() ? min(prevRootBox()->lineBottom(), lineTop()) + result : block()->borderBefore();
result = computeOverAnnotationAdjustment(highestAllowedPosition);
} else {
// Annotations under this line may push us up.
if (hasAnnotationsBefore())
result = computeUnderAnnotationAdjustment(prevRootBox() ? prevRootBox()->lineBottom() : block()->borderBefore());
if (!prevRootBox() || !prevRootBox()->hasAnnotationsAfter())
return result;
// We have to compute the expansion for annotations over the previous line to see how much we should move.
int lowestAllowedPosition = max(prevRootBox()->lineBottom(), lineTop()) - result;
result = prevRootBox()->computeOverAnnotationAdjustment(lowestAllowedPosition);
}
return result;
}
GapRects RootInlineBox::lineSelectionGap(RenderBlock* rootBlock, const IntPoint& rootBlockPhysicalPosition, const IntSize& offsetFromRootBlock,
int selTop, int selHeight, const PaintInfo* paintInfo)
{
RenderObject::SelectionState lineState = selectionState();
bool leftGap, rightGap;
block()->getSelectionGapInfo(lineState, leftGap, rightGap);
GapRects result;
InlineBox* firstBox = firstSelectedBox();
InlineBox* lastBox = lastSelectedBox();
if (leftGap)
result.uniteLeft(block()->logicalLeftSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock,
firstBox->parent()->renderer(), firstBox->logicalLeft(), selTop, selHeight, paintInfo));
if (rightGap)
result.uniteRight(block()->logicalRightSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock,
lastBox->parent()->renderer(), lastBox->logicalRight(), selTop, selHeight, paintInfo));
// When dealing with bidi text, a non-contiguous selection region is possible.
// e.g. The logical text aaaAAAbbb (capitals denote RTL text and non-capitals LTR) is layed out
// visually as 3 text runs |aaa|bbb|AAA| if we select 4 characters from the start of the text the
// selection will look like (underline denotes selection):
// |aaa|bbb|AAA|
// ___ _
// We can see that the |bbb| run is not part of the selection while the runs around it are.
if (firstBox && firstBox != lastBox) {
// Now fill in any gaps on the line that occurred between two selected elements.
int lastLogicalLeft = firstBox->logicalRight();
bool isPreviousBoxSelected = firstBox->selectionState() != RenderObject::SelectionNone;
for (InlineBox* box = firstBox->nextLeafChild(); box; box = box->nextLeafChild()) {
if (box->selectionState() != RenderObject::SelectionNone) {
IntRect logicalRect(lastLogicalLeft, selTop, box->logicalLeft() - lastLogicalLeft, selHeight);
logicalRect.move(renderer()->isHorizontalWritingMode() ? offsetFromRootBlock : IntSize(offsetFromRootBlock.height(), offsetFromRootBlock.width()));
IntRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, logicalRect);
if (isPreviousBoxSelected && gapRect.width() > 0 && gapRect.height() > 0) {
if (paintInfo && box->parent()->renderer()->style()->visibility() == VISIBLE)
paintInfo->context->fillRect(gapRect, box->parent()->renderer()->selectionBackgroundColor(), box->parent()->renderer()->style()->colorSpace());
// VisibleSelection may be non-contiguous, see comment above.
result.uniteCenter(gapRect);
}
lastLogicalLeft = box->logicalRight();
}
if (box == lastBox)
break;
isPreviousBoxSelected = box->selectionState() != RenderObject::SelectionNone;
}
}
return result;
}
RenderObject::SelectionState RootInlineBox::selectionState()
{
// Walk over all of the selected boxes.
RenderObject::SelectionState state = RenderObject::SelectionNone;
for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) {
RenderObject::SelectionState boxState = box->selectionState();
if ((boxState == RenderObject::SelectionStart && state == RenderObject::SelectionEnd) ||
(boxState == RenderObject::SelectionEnd && state == RenderObject::SelectionStart))
state = RenderObject::SelectionBoth;
else if (state == RenderObject::SelectionNone ||
((boxState == RenderObject::SelectionStart || boxState == RenderObject::SelectionEnd) &&
(state == RenderObject::SelectionNone || state == RenderObject::SelectionInside)))
state = boxState;
if (state == RenderObject::SelectionBoth)
break;
}
return state;
}
InlineBox* RootInlineBox::firstSelectedBox()
{
for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) {
if (box->selectionState() != RenderObject::SelectionNone)
return box;
}
return 0;
}
InlineBox* RootInlineBox::lastSelectedBox()
{
for (InlineBox* box = lastLeafChild(); box; box = box->prevLeafChild()) {
if (box->selectionState() != RenderObject::SelectionNone)
return box;
}
return 0;
}
int RootInlineBox::selectionTop() const
{
int selectionTop = m_lineTop;
if (m_hasAnnotationsBefore)
selectionTop -= !renderer()->style()->isFlippedLinesWritingMode() ? computeOverAnnotationAdjustment(m_lineTop) : computeUnderAnnotationAdjustment(m_lineTop);
if (renderer()->style()->isFlippedLinesWritingMode())
return selectionTop;
int prevBottom = prevRootBox() ? prevRootBox()->selectionBottom() : block()->borderBefore() + block()->paddingBefore();
if (prevBottom < selectionTop && block()->containsFloats()) {
// This line has actually been moved further down, probably from a large line-height, but possibly because the
// line was forced to clear floats. If so, let's check the offsets, and only be willing to use the previous
// line's bottom if the offsets are greater on both sides.
int prevLeft = block()->logicalLeftOffsetForLine(prevBottom, false);
int prevRight = block()->logicalRightOffsetForLine(prevBottom, false);
int newLeft = block()->logicalLeftOffsetForLine(selectionTop, false);
int newRight = block()->logicalRightOffsetForLine(selectionTop, false);
if (prevLeft > newLeft || prevRight < newRight)
return selectionTop;
}
return prevBottom;
}
int RootInlineBox::selectionBottom() const
{
int selectionBottom = m_lineBottom;
if (m_hasAnnotationsAfter)
selectionBottom += !renderer()->style()->isFlippedLinesWritingMode() ? computeUnderAnnotationAdjustment(m_lineBottom) : computeOverAnnotationAdjustment(m_lineBottom);
if (!renderer()->style()->isFlippedLinesWritingMode() || !nextRootBox())
return selectionBottom;
int nextTop = nextRootBox()->selectionTop();
if (nextTop > selectionBottom && block()->containsFloats()) {
// The next line has actually been moved further over, probably from a large line-height, but possibly because the
// line was forced to clear floats. If so, let's check the offsets, and only be willing to use the next
// line's top if the offsets are greater on both sides.
int nextLeft = block()->logicalLeftOffsetForLine(nextTop, false);
int nextRight = block()->logicalRightOffsetForLine(nextTop, false);
int newLeft = block()->logicalLeftOffsetForLine(selectionBottom, false);
int newRight = block()->logicalRightOffsetForLine(selectionBottom, false);
if (nextLeft > newLeft || nextRight < newRight)
return selectionBottom;
}
return nextTop;
}
RenderBlock* RootInlineBox::block() const
{
return toRenderBlock(renderer());
}
static bool isEditableLeaf(InlineBox* leaf)
{
return leaf && leaf->renderer() && leaf->renderer()->node() && leaf->renderer()->node()->rendererIsEditable();
}
InlineBox* RootInlineBox::closestLeafChildForLogicalLeftPosition(int leftPosition, bool onlyEditableLeaves)
{
InlineBox* firstLeaf = firstLeafChild();
InlineBox* lastLeaf = lastLeafChild();
if (firstLeaf == lastLeaf && (!onlyEditableLeaves || isEditableLeaf(firstLeaf)))
return firstLeaf;
// Avoid returning a list marker when possible.
if (leftPosition <= firstLeaf->logicalLeft() && !firstLeaf->renderer()->isListMarker() && (!onlyEditableLeaves || isEditableLeaf(firstLeaf)))
// The leftPosition coordinate is less or equal to left edge of the firstLeaf.
// Return it.
return firstLeaf;
if (leftPosition >= lastLeaf->logicalRight() && !lastLeaf->renderer()->isListMarker() && (!onlyEditableLeaves || isEditableLeaf(lastLeaf)))
// The leftPosition coordinate is greater or equal to right edge of the lastLeaf.
// Return it.
return lastLeaf;
InlineBox* closestLeaf = 0;
for (InlineBox* leaf = firstLeaf; leaf; leaf = leaf->nextLeafChild()) {
if (!leaf->renderer()->isListMarker() && (!onlyEditableLeaves || isEditableLeaf(leaf))) {
closestLeaf = leaf;
if (leftPosition < leaf->logicalRight())
// The x coordinate is less than the right edge of the box.
// Return it.
return leaf;
}
}
return closestLeaf ? closestLeaf : lastLeaf;
}
BidiStatus RootInlineBox::lineBreakBidiStatus() const
{
return BidiStatus(m_lineBreakBidiStatusEor, m_lineBreakBidiStatusLastStrong, m_lineBreakBidiStatusLast, m_lineBreakContext);
}
void RootInlineBox::setLineBreakInfo(RenderObject* obj, unsigned breakPos, const BidiStatus& status)
{
m_lineBreakObj = obj;
m_lineBreakPos = breakPos;
m_lineBreakBidiStatusEor = status.eor;
m_lineBreakBidiStatusLastStrong = status.lastStrong;
m_lineBreakBidiStatusLast = status.last;
m_lineBreakContext = status.context;
}
EllipsisBox* RootInlineBox::ellipsisBox() const
{
if (!hasEllipsisBox())
return 0;
return gEllipsisBoxMap->get(this);
}
void RootInlineBox::removeLineBoxFromRenderObject()
{
block()->lineBoxes()->removeLineBox(this);
}
void RootInlineBox::extractLineBoxFromRenderObject()
{
block()->lineBoxes()->extractLineBox(this);
}
void RootInlineBox::attachLineBoxToRenderObject()
{
block()->lineBoxes()->attachLineBox(this);
}
IntRect RootInlineBox::paddedLayoutOverflowRect(int endPadding) const
{
IntRect lineLayoutOverflow = layoutOverflowRect();
if (!endPadding)
return lineLayoutOverflow;
if (isHorizontal()) {
if (isLeftToRightDirection())
lineLayoutOverflow.shiftMaxXEdgeTo(max(lineLayoutOverflow.maxX(), pixelSnappedLogicalRight() + endPadding));
else
lineLayoutOverflow.shiftXEdgeTo(min(lineLayoutOverflow.x(), pixelSnappedLogicalLeft() - endPadding));
} else {
if (isLeftToRightDirection())
lineLayoutOverflow.shiftMaxYEdgeTo(max(lineLayoutOverflow.maxY(), pixelSnappedLogicalRight() + endPadding));
else
lineLayoutOverflow.shiftYEdgeTo(min(lineLayoutOverflow.y(), pixelSnappedLogicalLeft() - endPadding));
}
return lineLayoutOverflow;
}
static void setAscentAndDescent(int& ascent, int& descent, int newAscent, int newDescent, bool& ascentDescentSet)
{
if (!ascentDescentSet) {
ascentDescentSet = true;
ascent = newAscent;
descent = newDescent;
} else {
ascent = max(ascent, newAscent);
descent = max(descent, newDescent);
}
}
void RootInlineBox::ascentAndDescentForBox(InlineBox* box, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, int& ascent, int& descent,
bool& affectsAscent, bool& affectsDescent) const
{
bool ascentDescentSet = false;
// Replaced boxes will return 0 for the line-height if line-box-contain says they are
// not to be included.
if (box->renderer()->isReplaced()) {
if (renderer()->style(m_firstLine)->lineBoxContain() & LineBoxContainReplaced) {
ascent = box->baselinePosition(baselineType());
descent = box->lineHeight() - ascent;
// Replaced elements always affect both the ascent and descent.
affectsAscent = true;
affectsDescent = true;
}
return;
}
Vector<const SimpleFontData*>* usedFonts = 0;
GlyphOverflow* glyphOverflow = 0;
if (box->isText()) {
GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(static_cast<InlineTextBox*>(box));
usedFonts = it == textBoxDataMap.end() ? 0 : &it->second.first;
glyphOverflow = it == textBoxDataMap.end() ? 0 : &it->second.second;
}
bool includeLeading = includeLeadingForBox(box);
bool includeFont = includeFontForBox(box);
bool setUsedFont = false;
bool setUsedFontWithLeading = false;
if (usedFonts && !usedFonts->isEmpty() && (includeFont || (box->renderer()->style(m_firstLine)->lineHeight().isNegative() && includeLeading))) {
usedFonts->append(box->renderer()->style(m_firstLine)->font().primaryFont());
for (size_t i = 0; i < usedFonts->size(); ++i) {
const FontMetrics& fontMetrics = usedFonts->at(i)->fontMetrics();
int usedFontAscent = fontMetrics.ascent(baselineType());
int usedFontDescent = fontMetrics.descent(baselineType());
int halfLeading = (fontMetrics.lineSpacing() - fontMetrics.height()) / 2;
int usedFontAscentAndLeading = usedFontAscent + halfLeading;
int usedFontDescentAndLeading = fontMetrics.lineSpacing() - usedFontAscentAndLeading;
if (includeFont) {
setAscentAndDescent(ascent, descent, usedFontAscent, usedFontDescent, ascentDescentSet);
setUsedFont = true;
}
if (includeLeading) {
setAscentAndDescent(ascent, descent, usedFontAscentAndLeading, usedFontDescentAndLeading, ascentDescentSet);
setUsedFontWithLeading = true;
}
if (!affectsAscent)
affectsAscent = usedFontAscent - box->logicalTop() > 0;
if (!affectsDescent)
affectsDescent = usedFontDescent + box->logicalTop() > 0;
}
}
// If leading is included for the box, then we compute that box.
if (includeLeading && !setUsedFontWithLeading) {
int ascentWithLeading = box->baselinePosition(baselineType());
int descentWithLeading = box->lineHeight() - ascentWithLeading;
setAscentAndDescent(ascent, descent, ascentWithLeading, descentWithLeading, ascentDescentSet);
// Examine the font box for inline flows and text boxes to see if any part of it is above the baseline.
// If the top of our font box relative to the root box baseline is above the root box baseline, then
// we are contributing to the maxAscent value. Descent is similar. If any part of our font box is below
// the root box's baseline, then we contribute to the maxDescent value.
affectsAscent = ascentWithLeading - box->logicalTop() > 0;
affectsDescent = descentWithLeading + box->logicalTop() > 0;
}
if (includeFontForBox(box) && !setUsedFont) {
int fontAscent = box->renderer()->style(m_firstLine)->fontMetrics().ascent();
int fontDescent = box->renderer()->style(m_firstLine)->fontMetrics().descent();
setAscentAndDescent(ascent, descent, fontAscent, fontDescent, ascentDescentSet);
affectsAscent = fontAscent - box->logicalTop() > 0;
affectsDescent = fontDescent + box->logicalTop() > 0;
}
if (includeGlyphsForBox(box) && glyphOverflow && glyphOverflow->computeBounds) {
setAscentAndDescent(ascent, descent, glyphOverflow->top, glyphOverflow->bottom, ascentDescentSet);
affectsAscent = glyphOverflow->top - box->logicalTop() > 0;
affectsDescent = glyphOverflow->bottom + box->logicalTop() > 0;
glyphOverflow->top = min(glyphOverflow->top, max(0, glyphOverflow->top - box->renderer()->style(m_firstLine)->fontMetrics().ascent()));
glyphOverflow->bottom = min(glyphOverflow->bottom, max(0, glyphOverflow->bottom - box->renderer()->style(m_firstLine)->fontMetrics().descent()));
}
if (includeMarginForBox(box)) {
int ascentWithMargin = box->renderer()->style(m_firstLine)->fontMetrics().ascent();
int descentWithMargin = box->renderer()->style(m_firstLine)->fontMetrics().descent();
if (box->parent() && !box->renderer()->isText()) {
ascentWithMargin += box->boxModelObject()->borderBefore() + box->boxModelObject()->paddingBefore() + box->boxModelObject()->marginBefore();
descentWithMargin += box->boxModelObject()->borderAfter() + box->boxModelObject()->paddingAfter() + box->boxModelObject()->marginAfter();
}
setAscentAndDescent(ascent, descent, ascentWithMargin, descentWithMargin, ascentDescentSet);
// Treat like a replaced element, since we're using the margin box.
affectsAscent = true;
affectsDescent = true;
}
}
int RootInlineBox::verticalPositionForBox(InlineBox* box, VerticalPositionCache& verticalPositionCache)
{
if (box->renderer()->isText())
return box->parent()->logicalTop();
RenderBoxModelObject* renderer = box->boxModelObject();
ASSERT(renderer->isInline());
if (!renderer->isInline())
return 0;
// This method determines the vertical position for inline elements.
bool firstLine = m_firstLine;
if (firstLine && !renderer->document()->usesFirstLineRules())
firstLine = false;
// Check the cache.
bool isRenderInline = renderer->isRenderInline();
if (isRenderInline && !firstLine) {
int verticalPosition = verticalPositionCache.get(renderer, baselineType());
if (verticalPosition != PositionUndefined)
return verticalPosition;
}
int verticalPosition = 0;
EVerticalAlign verticalAlign = renderer->style()->verticalAlign();
if (verticalAlign == TOP || verticalAlign == BOTTOM)
return 0;
RenderObject* parent = renderer->parent();
if (parent->isRenderInline() && parent->style()->verticalAlign() != TOP && parent->style()->verticalAlign() != BOTTOM)
verticalPosition = box->parent()->logicalTop();
if (verticalAlign != BASELINE) {
const Font& font = parent->style(firstLine)->font();
const FontMetrics& fontMetrics = font.fontMetrics();
int fontSize = font.pixelSize();
LineDirectionMode lineDirection = parent->isHorizontalWritingMode() ? HorizontalLine : VerticalLine;
if (verticalAlign == SUB)
verticalPosition += fontSize / 5 + 1;
else if (verticalAlign == SUPER)
verticalPosition -= fontSize / 3 + 1;
else if (verticalAlign == TEXT_TOP)
verticalPosition += renderer->baselinePosition(baselineType(), firstLine, lineDirection) - fontMetrics.ascent(baselineType());
else if (verticalAlign == MIDDLE)
verticalPosition += -static_cast<int>(fontMetrics.xHeight() / 2) - renderer->lineHeight(firstLine, lineDirection) / 2 + renderer->baselinePosition(baselineType(), firstLine, lineDirection);
else if (verticalAlign == TEXT_BOTTOM) {
verticalPosition += fontMetrics.descent(baselineType());
// lineHeight - baselinePosition is always 0 for replaced elements (except inline blocks), so don't bother wasting time in that case.
if (!renderer->isReplaced() || renderer->isInlineBlockOrInlineTable())
verticalPosition -= (renderer->lineHeight(firstLine, lineDirection) - renderer->baselinePosition(baselineType(), firstLine, lineDirection));
} else if (verticalAlign == BASELINE_MIDDLE)
verticalPosition += -renderer->lineHeight(firstLine, lineDirection) / 2 + renderer->baselinePosition(baselineType(), firstLine, lineDirection);
else if (verticalAlign == LENGTH)
verticalPosition -= renderer->style()->verticalAlignLength().calcValue(renderer->lineHeight(firstLine, lineDirection));
}
// Store the cached value.
if (isRenderInline && !firstLine)
verticalPositionCache.set(renderer, baselineType(), verticalPosition);
return verticalPosition;
}
bool RootInlineBox::includeLeadingForBox(InlineBox* box) const
{
if (box->renderer()->isReplaced() || (box->renderer()->isText() && !box->isText()))
return false;
LineBoxContain lineBoxContain = renderer()->style()->lineBoxContain();
return (lineBoxContain & LineBoxContainInline) || (box == this && (lineBoxContain & LineBoxContainBlock));
}
bool RootInlineBox::includeFontForBox(InlineBox* box) const
{
if (box->renderer()->isReplaced() || (box->renderer()->isText() && !box->isText()))
return false;
if (!box->isText() && box->isInlineFlowBox() && !static_cast<InlineFlowBox*>(box)->hasTextChildren())
return false;
// For now map "glyphs" to "font" in vertical text mode until the bounds returned by glyphs aren't garbage.
LineBoxContain lineBoxContain = renderer()->style()->lineBoxContain();
return (lineBoxContain & LineBoxContainFont) || (!isHorizontal() && (lineBoxContain & LineBoxContainGlyphs));
}
bool RootInlineBox::includeGlyphsForBox(InlineBox* box) const
{
if (box->renderer()->isReplaced() || (box->renderer()->isText() && !box->isText()))
return false;
if (!box->isText() && box->isInlineFlowBox() && !static_cast<InlineFlowBox*>(box)->hasTextChildren())
return false;
// FIXME: We can't fit to glyphs yet for vertical text, since the bounds returned are garbage.
LineBoxContain lineBoxContain = renderer()->style()->lineBoxContain();
return isHorizontal() && (lineBoxContain & LineBoxContainGlyphs);
}
bool RootInlineBox::includeMarginForBox(InlineBox* box) const
{
if (box->renderer()->isReplaced() || (box->renderer()->isText() && !box->isText()))
return false;
LineBoxContain lineBoxContain = renderer()->style()->lineBoxContain();
return lineBoxContain & LineBoxContainInlineBox;
}
bool RootInlineBox::fitsToGlyphs() const
{
// FIXME: We can't fit to glyphs yet for vertical text, since the bounds returned are garbage.
LineBoxContain lineBoxContain = renderer()->style()->lineBoxContain();
return isHorizontal() && (lineBoxContain & LineBoxContainGlyphs);
}
bool RootInlineBox::includesRootLineBoxFontOrLeading() const
{
LineBoxContain lineBoxContain = renderer()->style()->lineBoxContain();
return (lineBoxContain & LineBoxContainBlock) || (lineBoxContain & LineBoxContainInline) || (lineBoxContain & LineBoxContainFont);
}
Node* RootInlineBox::getLogicalStartBoxWithNode(InlineBox*& startBox)
{
Vector<InlineBox*> leafBoxesInLogicalOrder;
collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder);
for (size_t i = 0; i < leafBoxesInLogicalOrder.size(); ++i) {
if (leafBoxesInLogicalOrder[i]->renderer()->node()) {
startBox = leafBoxesInLogicalOrder[i];
return startBox->renderer()->node();
}
}
startBox = 0;
return 0;
}
Node* RootInlineBox::getLogicalEndBoxWithNode(InlineBox*& endBox)
{
Vector<InlineBox*> leafBoxesInLogicalOrder;
collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder);
for (size_t i = leafBoxesInLogicalOrder.size(); i > 0; --i) {
if (leafBoxesInLogicalOrder[i - 1]->renderer()->node()) {
endBox = leafBoxesInLogicalOrder[i - 1];
return endBox->renderer()->node();
}
}
endBox = 0;
return 0;
}
} // namespace WebCore