#include "config.h"
#include "LineWidth.h"
#include "RenderBlockFlow.h"
#include "RenderRubyRun.h"
namespace WebCore {
LineWidth::LineWidth(RenderBlockFlow& block, bool isFirstLine, IndentTextOrNot shouldIndentText)
: m_block(block)
, m_uncommittedWidth(0)
, m_committedWidth(0)
, m_overhangWidth(0)
, m_trailingWhitespaceWidth(0)
, m_trailingCollapsedWhitespaceWidth(0)
, m_left(0)
, m_right(0)
, m_availableWidth(0)
, m_isFirstLine(isFirstLine)
, m_shouldIndentText(shouldIndentText)
{
updateAvailableWidth();
}
bool LineWidth::fitsOnLine(bool ignoringTrailingSpace) const
{
return ignoringTrailingSpace ? fitsOnLineExcludingTrailingCollapsedWhitespace() : fitsOnLineIncludingExtraWidth(0);
}
bool LineWidth::fitsOnLineIncludingExtraWidth(float extra) const
{
return currentWidth() + extra <= m_availableWidth;
}
bool LineWidth::fitsOnLineExcludingTrailingWhitespace(float extra) const
{
return currentWidth() - m_trailingWhitespaceWidth + extra <= m_availableWidth;
}
void LineWidth::updateAvailableWidth(LayoutUnit replacedHeight)
{
LayoutUnit height = m_block.logicalHeight();
LayoutUnit logicalHeight = m_block.minLineHeightForReplacedRenderer(m_isFirstLine, replacedHeight);
m_left = m_block.logicalLeftOffsetForLine(height, shouldIndentText(), logicalHeight);
m_right = m_block.logicalRightOffsetForLine(height, shouldIndentText(), logicalHeight);
computeAvailableWidthFromLeftAndRight();
}
void LineWidth::shrinkAvailableWidthForNewFloatIfNeeded(FloatingObject* newFloat)
{
LayoutUnit height = m_block.logicalHeight();
if (height < m_block.logicalTopForFloat(newFloat) || height >= m_block.logicalBottomForFloat(newFloat))
return;
#if ENABLE(CSS_SHAPES)
ShapeOutsideInfo* shapeOutsideInfo = newFloat->renderer().shapeOutsideInfo();
if (shapeOutsideInfo) {
LayoutUnit lineHeight = m_block.lineHeight(m_isFirstLine, m_block.isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
shapeOutsideInfo->updateDeltasForContainingBlockLine(m_block, *newFloat, m_block.logicalHeight(), lineHeight);
}
#endif
if (newFloat->type() == FloatingObject::FloatLeft) {
float newLeft = m_block.logicalRightForFloat(newFloat);
if (shouldIndentText() && m_block.style().isLeftToRightDirection())
newLeft += floorToInt(m_block.textIndentOffset());
#if ENABLE(CSS_SHAPES)
if (shapeOutsideInfo) {
if (shapeOutsideInfo->lineOverlapsShape())
newLeft += shapeOutsideInfo->rightMarginBoxDelta();
else newLeft = m_left;
}
#endif
m_left = std::max<float>(m_left, newLeft);
} else {
float newRight = m_block.logicalLeftForFloat(newFloat);
if (shouldIndentText() && !m_block.style().isLeftToRightDirection())
newRight -= floorToInt(m_block.textIndentOffset());
#if ENABLE(CSS_SHAPES)
if (shapeOutsideInfo) {
if (shapeOutsideInfo->lineOverlapsShape())
newRight += shapeOutsideInfo->leftMarginBoxDelta();
else newRight = m_right;
}
#endif
m_right = std::min<float>(m_right, newRight);
}
computeAvailableWidthFromLeftAndRight();
}
void LineWidth::commit()
{
m_committedWidth += m_uncommittedWidth;
m_uncommittedWidth = 0;
}
void LineWidth::applyOverhang(RenderRubyRun* rubyRun, RenderObject* startRenderer, RenderObject* endRenderer)
{
int startOverhang;
int endOverhang;
rubyRun->getOverhang(m_isFirstLine, startRenderer, endRenderer, startOverhang, endOverhang);
startOverhang = std::min<int>(startOverhang, m_committedWidth);
m_availableWidth += startOverhang;
endOverhang = std::max(std::min<int>(endOverhang, m_availableWidth - currentWidth()), 0);
m_availableWidth += endOverhang;
m_overhangWidth += startOverhang + endOverhang;
}
inline static float availableWidthAtOffset(const RenderBlockFlow& block, const LayoutUnit& offset, bool shouldIndentText, float& newLineLeft, float& newLineRight)
{
newLineLeft = block.logicalLeftOffsetForLine(offset, shouldIndentText);
newLineRight = block.logicalRightOffsetForLine(offset, shouldIndentText);
return std::max(0.0f, newLineRight - newLineLeft);
}
inline static float availableWidthAtOffset(const RenderBlockFlow& block, const LayoutUnit& offset, bool shouldIndentText)
{
float newLineLeft = 0;
float newLineRight = 0;
return availableWidthAtOffset(block, offset, shouldIndentText, newLineLeft, newLineRight);
}
void LineWidth::updateLineDimension(LayoutUnit newLineTop, LayoutUnit newLineWidth, float newLineLeft, float newLineRight)
{
if (newLineWidth <= m_availableWidth)
return;
m_block.setLogicalHeight(newLineTop);
m_availableWidth = newLineWidth + m_overhangWidth;
m_left = newLineLeft;
m_right = newLineRight;
}
#if ENABLE(CSS_SHAPES)
inline static bool isWholeLineFit(const RenderBlockFlow& block, const LayoutUnit& lineTop, LayoutUnit lineHeight, float uncommittedWidth, bool shouldIndentText)
{
for (LayoutUnit lineBottom = lineTop; lineBottom <= lineTop + lineHeight; ++lineBottom) {
LayoutUnit availableWidthAtBottom = availableWidthAtOffset(block, lineBottom, shouldIndentText);
if (availableWidthAtBottom < uncommittedWidth)
return false;
}
return true;
}
void LineWidth::wrapNextToShapeOutside(bool isFirstLine)
{
LayoutUnit lineHeight = m_block.lineHeight(isFirstLine, m_block.isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
LayoutUnit lineLogicalTop = m_block.logicalHeight();
LayoutUnit newLineTop = lineLogicalTop;
LayoutUnit floatLogicalBottom = m_block.nextFloatLogicalBottomBelow(lineLogicalTop);
float newLineWidth;
float newLineLeft = m_left;
float newLineRight = m_right;
while (true) {
newLineWidth = availableWidthAtOffset(m_block, newLineTop, shouldIndentText(), newLineLeft, newLineRight);
if (newLineWidth >= m_uncommittedWidth && isWholeLineFit(m_block, newLineTop, lineHeight, m_uncommittedWidth, shouldIndentText()))
break;
if (newLineTop >= floatLogicalBottom)
break;
++newLineTop;
}
updateLineDimension(newLineTop, newLineWidth, newLineLeft, newLineRight);
}
#endif
void LineWidth::fitBelowFloats(bool isFirstLine)
{
#if !ENABLE(CSS_SHAPES)
UNUSED_PARAM(isFirstLine);
#endif
ASSERT(!m_committedWidth);
ASSERT(!fitsOnLine());
LayoutUnit floatLogicalBottom;
LayoutUnit lastFloatLogicalBottom = m_block.logicalHeight();
float newLineWidth = m_availableWidth;
float newLineLeft = m_left;
float newLineRight = m_right;
#if ENABLE(CSS_SHAPES)
FloatingObject* lastFloatFromPreviousLine = (m_block.containsFloats() ? m_block.m_floatingObjects->set().last().get() : 0);
if (lastFloatFromPreviousLine && lastFloatFromPreviousLine->renderer().shapeOutsideInfo())
return wrapNextToShapeOutside(isFirstLine);
#endif
while (true) {
floatLogicalBottom = m_block.nextFloatLogicalBottomBelow(lastFloatLogicalBottom);
if (floatLogicalBottom <= lastFloatLogicalBottom)
break;
newLineWidth = availableWidthAtOffset(m_block, floatLogicalBottom, shouldIndentText(), newLineLeft, newLineRight);
lastFloatLogicalBottom = floatLogicalBottom;
if (newLineWidth >= m_uncommittedWidth)
break;
}
updateLineDimension(lastFloatLogicalBottom, newLineWidth, newLineLeft, newLineRight);
}
void LineWidth::setTrailingWhitespaceWidth(float collapsedWhitespace, float borderPaddingMargin)
{
m_trailingCollapsedWhitespaceWidth = collapsedWhitespace;
m_trailingWhitespaceWidth = collapsedWhitespace + borderPaddingMargin;
}
void LineWidth::computeAvailableWidthFromLeftAndRight()
{
m_availableWidth = std::max<float>(0, m_right - m_left) + m_overhangWidth;
}
bool LineWidth::fitsOnLineExcludingTrailingCollapsedWhitespace() const
{
return currentWidth() - m_trailingCollapsedWhitespaceWidth <= m_availableWidth;
}
IndentTextOrNot requiresIndent(bool isFirstLine, bool isAfterHardLineBreak, const RenderStyle& style)
{
IndentTextOrNot shouldIndentText = DoNotIndentText;
if (isFirstLine)
shouldIndentText = IndentText;
#if ENABLE(CSS3_TEXT)
else if (isAfterHardLineBreak && style.textIndentLine() == TextIndentEachLine)
shouldIndentText = IndentText;
if (style.textIndentType() == TextIndentHanging)
shouldIndentText = shouldIndentText == IndentText ? DoNotIndentText : IndentText;
#else
UNUSED_PARAM(isAfterHardLineBreak);
UNUSED_PARAM(style);
#endif
return shouldIndentText;
}
}