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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "RenderRubyRun.h"
#include "RenderRuby.h"
#include "RenderRubyBase.h"
#include "RenderRubyText.h"
#include "RenderText.h"
#include "RenderView.h"
#include "StyleInheritedData.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/StackStats.h>
namespace WebCore {
using namespace std;
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderRubyRun);
RenderRubyRun::RenderRubyRun(Document& document, RenderStyle&& style)
: RenderBlockFlow(document, WTFMove(style))
, m_lastCharacter(0)
, m_secondToLastCharacter(0)
{
setReplaced(true);
setInline(true);
}
RenderRubyRun::~RenderRubyRun() = default;
bool RenderRubyRun::hasRubyText() const
{
// The only place where a ruby text can be is in the first position
// Note: As anonymous blocks, ruby runs do not have ':before' or ':after' content themselves.
return firstChild() && firstChild()->isRubyText();
}
bool RenderRubyRun::hasRubyBase() const
{
// The only place where a ruby base can be is in the last position
// Note: As anonymous blocks, ruby runs do not have ':before' or ':after' content themselves.
return lastChild() && lastChild()->isRubyBase();
}
RenderRubyText* RenderRubyRun::rubyText() const
{
RenderObject* child = firstChild();
// If in future it becomes necessary to support floating or positioned ruby text,
// layout will have to be changed to handle them properly.
ASSERT(!child || !child->isRubyText() || !child->isFloatingOrOutOfFlowPositioned());
return child && child->isRubyText() ? static_cast<RenderRubyText*>(child) : nullptr;
}
RenderRubyBase* RenderRubyRun::rubyBase() const
{
RenderObject* child = lastChild();
return child && child->isRubyBase() ? static_cast<RenderRubyBase*>(child) : nullptr;
}
RenderBlock* RenderRubyRun::firstLineBlock() const
{
return nullptr;
}
bool RenderRubyRun::isChildAllowed(const RenderObject& child, const RenderStyle&) const
{
return child.isInline() || child.isRubyText();
}
RenderPtr<RenderRubyBase> RenderRubyRun::createRubyBase() const
{
auto newStyle = RenderStyle::createAnonymousStyleWithDisplay(style(), BLOCK);
newStyle.setTextAlign(CENTER); // FIXME: use WEBKIT_CENTER?
auto renderer = createRenderer<RenderRubyBase>(document(), WTFMove(newStyle));
renderer->initializeStyle();
return renderer;
}
RenderPtr<RenderRubyRun> RenderRubyRun::staticCreateRubyRun(const RenderObject* parentRuby)
{
ASSERT(isRuby(parentRuby));
auto renderer = createRenderer<RenderRubyRun>(parentRuby->document(), RenderStyle::createAnonymousStyleWithDisplay(parentRuby->style(), INLINE_BLOCK));
renderer->initializeStyle();
return renderer;
}
void RenderRubyRun::layoutExcludedChildren(bool relayoutChildren)
{
RenderBlockFlow::layoutExcludedChildren(relayoutChildren);
StackStats::LayoutCheckPoint layoutCheckPoint;
// Don't bother positioning the RenderRubyRun yet.
RenderRubyText* rt = rubyText();
if (!rt)
return;
rt->setIsExcludedFromNormalLayout(true);
if (relayoutChildren)
rt->setChildNeedsLayout(MarkOnlyThis);
rt->layoutIfNeeded();
}
void RenderRubyRun::layout()
{
if (RenderRubyBase* base = rubyBase())
base->reset();
RenderBlockFlow::layout();
}
void RenderRubyRun::layoutBlock(bool relayoutChildren, LayoutUnit pageHeight)
{
if (!relayoutChildren) {
// Since the extra relayout in RenderBlockFlow::updateRubyForJustifiedText() causes the size of the RenderRubyText/RenderRubyBase
// dependent on the line's current expansion, whenever we relayout the RenderRubyRun, we need to relayout the RenderRubyBase/RenderRubyText as well.
// FIXME: We should take the expansion opportunities into account if possible.
relayoutChildren = style().textAlign() == JUSTIFY;
}
RenderBlockFlow::layoutBlock(relayoutChildren, pageHeight);
RenderRubyText* rt = rubyText();
if (!rt)
return;
rt->setLogicalLeft(0);
// Place the RenderRubyText such that its bottom is flush with the lineTop of the first line of the RenderRubyBase.
LayoutUnit lastLineRubyTextBottom = rt->logicalHeight();
LayoutUnit firstLineRubyTextTop = 0;
RootInlineBox* rootBox = rt->lastRootBox();
if (rootBox) {
// In order to align, we have to ignore negative leading.
firstLineRubyTextTop = rt->firstRootBox()->logicalTopLayoutOverflow();
lastLineRubyTextBottom = rootBox->logicalBottomLayoutOverflow();
}
if (isHorizontalWritingMode() && rt->style().rubyPosition() == RubyPositionInterCharacter) {
// Bopomofo. We need to move the RenderRubyText over to the right side and center it
// vertically relative to the base.
const FontCascade& font = style().fontCascade();
float distanceBetweenBase = max(font.letterSpacing(), 2.0f * rt->style().fontCascade().fontMetrics().height());
setWidth(width() + distanceBetweenBase - font.letterSpacing());
if (RenderRubyBase* rb = rubyBase()) {
LayoutUnit firstLineTop = 0;
LayoutUnit lastLineBottom = logicalHeight();
RootInlineBox* rootBox = rb->firstRootBox();
if (rootBox)
firstLineTop = rootBox->logicalTopLayoutOverflow();
firstLineTop += rb->logicalTop();
if (rootBox)
lastLineBottom = rootBox->logicalBottomLayoutOverflow();
lastLineBottom += rb->logicalTop();
rt->setX(rb->x() + rb->width() - font.letterSpacing());
LayoutUnit extent = lastLineBottom - firstLineTop;
rt->setY(firstLineTop + (extent - rt->height()) / 2);
}
} else if (style().isFlippedLinesWritingMode() == (style().rubyPosition() == RubyPositionAfter)) {
LayoutUnit firstLineTop = 0;
if (RenderRubyBase* rb = rubyBase()) {
RootInlineBox* rootBox = rb->firstRootBox();
if (rootBox)
firstLineTop = rootBox->logicalTopLayoutOverflow();
firstLineTop += rb->logicalTop();
}
rt->setLogicalTop(-lastLineRubyTextBottom + firstLineTop);
} else {
LayoutUnit lastLineBottom = logicalHeight();
if (RenderRubyBase* rb = rubyBase()) {
RootInlineBox* rootBox = rb->lastRootBox();
if (rootBox)
lastLineBottom = rootBox->logicalBottomLayoutOverflow();
lastLineBottom += rb->logicalTop();
}
rt->setLogicalTop(-firstLineRubyTextTop + lastLineBottom);
}
// Update our overflow to account for the new RenderRubyText position.
computeOverflow(clientLogicalBottom());
}
static bool shouldOverhang(bool firstLine, const RenderObject* renderer, const RenderRubyBase& rubyBase)
{
if (!renderer || !renderer->isText())
return false;
const RenderStyle& rubyBaseStyle = firstLine ? rubyBase.firstLineStyle() : rubyBase.style();
const RenderStyle& style = firstLine ? renderer->firstLineStyle() : renderer->style();
return style.computedFontPixelSize() <= rubyBaseStyle.computedFontPixelSize();
}
void RenderRubyRun::getOverhang(bool firstLine, RenderObject* startRenderer, RenderObject* endRenderer, float& startOverhang, float& endOverhang) const
{
ASSERT(!needsLayout());
startOverhang = 0;
endOverhang = 0;
RenderRubyBase* rubyBase = this->rubyBase();
RenderRubyText* rubyText = this->rubyText();
if (!rubyBase || !rubyText)
return;
if (!rubyBase->firstRootBox())
return;
LayoutUnit logicalWidth = this->logicalWidth();
float logicalLeftOverhang = std::numeric_limits<float>::max();
float logicalRightOverhang = std::numeric_limits<float>::max();
for (RootInlineBox* rootInlineBox = rubyBase->firstRootBox(); rootInlineBox; rootInlineBox = rootInlineBox->nextRootBox()) {
logicalLeftOverhang = std::min<float>(logicalLeftOverhang, rootInlineBox->logicalLeft());
logicalRightOverhang = std::min<float>(logicalRightOverhang, logicalWidth - rootInlineBox->logicalRight());
}
startOverhang = style().isLeftToRightDirection() ? logicalLeftOverhang : logicalRightOverhang;
endOverhang = style().isLeftToRightDirection() ? logicalRightOverhang : logicalLeftOverhang;
if (!shouldOverhang(firstLine, startRenderer, *rubyBase))
startOverhang = 0;
if (!shouldOverhang(firstLine, endRenderer, *rubyBase))
endOverhang = 0;
// We overhang a ruby only if the neighboring render object is a text.
// We can overhang the ruby by no more than half the width of the neighboring text
// and no more than half the font size.
const RenderStyle& rubyTextStyle = firstLine ? rubyText->firstLineStyle() : rubyText->style();
float halfWidthOfFontSize = rubyTextStyle.computedFontPixelSize() / 2.;
if (startOverhang)
startOverhang = std::min(startOverhang, std::min(downcast<RenderText>(*startRenderer).minLogicalWidth(), halfWidthOfFontSize));
if (endOverhang)
endOverhang = std::min(endOverhang, std::min(downcast<RenderText>(*endRenderer).minLogicalWidth(), halfWidthOfFontSize));
}
void RenderRubyRun::updatePriorContextFromCachedBreakIterator(LazyLineBreakIterator& iterator) const
{
iterator.setPriorContext(m_lastCharacter, m_secondToLastCharacter);
}
bool RenderRubyRun::canBreakBefore(const LazyLineBreakIterator& iterator) const
{
RenderRubyText* rubyText = this->rubyText();
if (!rubyText)
return true;
return rubyText->canBreakBefore(iterator);
}
} // namespace WebCore