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/*
* Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 2. 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.
*
* 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 HOLDER 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.
*/
#ifndef LineWidth_h
#define LineWidth_h
#include "core/layout/api/LineLayoutBlockFlow.h"
#include "platform/LayoutUnit.h"
#include "wtf/Allocator.h"
namespace blink {
class FloatingObject;
class LineLayoutRubyRun;
enum WhitespaceTreatment { ExcludeWhitespace, IncludeWhitespace };
class LineWidth {
STACK_ALLOCATED();
public:
LineWidth(LineLayoutBlockFlow, bool isFirstLine, IndentTextOrNot);
bool fitsOnLine() const {
return LayoutUnit::fromFloatFloor(currentWidth()) <=
m_availableWidth + LayoutUnit::epsilon();
}
bool fitsOnLine(float extra) const {
float totalWidth = currentWidth() + extra;
return LayoutUnit::fromFloatFloor(totalWidth) <=
m_availableWidth + LayoutUnit::epsilon();
}
bool fitsOnLine(float extra, WhitespaceTreatment whitespaceTreatment) const {
LayoutUnit w = LayoutUnit::fromFloatFloor(currentWidth() + extra);
if (whitespaceTreatment == ExcludeWhitespace)
w -= LayoutUnit::fromFloatCeil(trailingWhitespaceWidth());
return w <= m_availableWidth;
}
// Note that m_uncommittedWidth may not be LayoutUnit-snapped at this point.
// Because currentWidth() is used by the code that lays out words in a single
// LayoutText, it's expected that offsets will not be snapped until an
// InlineBox boundary is reached.
float currentWidth() const { return m_committedWidth + m_uncommittedWidth; }
// FIXME: We should eventually replace these three functions by ones that work
// on a higher abstraction.
float uncommittedWidth() const { return m_uncommittedWidth; }
float committedWidth() const { return m_committedWidth; }
float availableWidth() const { return m_availableWidth; }
float trailingWhitespaceWidth() const { return m_trailingWhitespaceWidth; }
void updateAvailableWidth(LayoutUnit minimumHeight = LayoutUnit());
void shrinkAvailableWidthForNewFloatIfNeeded(const FloatingObject&);
void addUncommittedWidth(float delta) { m_uncommittedWidth += delta; }
void commit();
void applyOverhang(LineLayoutRubyRun,
LineLayoutItem startLayoutItem,
LineLayoutItem endLayoutItem);
void fitBelowFloats(bool isFirstLine = false);
void setTrailingWhitespaceWidth(float width) {
m_trailingWhitespaceWidth = width;
}
void snapUncommittedWidth() {
m_uncommittedWidth =
LayoutUnit::fromFloatCeil(m_uncommittedWidth).toFloat();
}
IndentTextOrNot indentText() const { return m_indentText; }
private:
void computeAvailableWidthFromLeftAndRight();
void updateLineDimension(LayoutUnit newLineTop,
LayoutUnit newLineWidth,
const LayoutUnit& newLineLeft,
const LayoutUnit& newLineRight);
void wrapNextToShapeOutside(bool isFirstLine);
LineLayoutBlockFlow m_block;
float m_uncommittedWidth;
float m_committedWidth;
// The amount by which |m_availableWidth| has been inflated to account for
// possible contraction due to ruby overhang.
float m_overhangWidth;
float m_trailingWhitespaceWidth;
LayoutUnit m_left;
LayoutUnit m_right;
LayoutUnit m_availableWidth;
bool m_isFirstLine;
IndentTextOrNot m_indentText;
};
} // namespace blink
#endif // LineWidth_h
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