1/* 2 * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above 9 * copyright notice, this list of conditions and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following 13 * disclaimer in the documentation and/or other materials 14 * provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 20 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 27 * OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#ifndef LineWidth_h 31#define LineWidth_h 32 33#include "LayoutUnit.h" 34 35namespace WebCore { 36 37class FloatingObject; 38class RenderBlockFlow; 39class RenderObject; 40class RenderRubyRun; 41class RenderStyle; 42 43struct LineSegment; 44 45enum IndentTextOrNot { DoNotIndentText, IndentText }; 46 47class LineWidth { 48public: 49 LineWidth(RenderBlockFlow&, bool isFirstLine, IndentTextOrNot shouldIndentText); 50 51 bool fitsOnLine(bool ignoringTrailingSpace = false) const; 52 bool fitsOnLineIncludingExtraWidth(float extra) const; 53 bool fitsOnLineExcludingTrailingWhitespace(float extra) const; 54 55 float currentWidth() const { return m_committedWidth + m_uncommittedWidth; } 56 // FIXME: We should eventually replace these three functions by ones that work on a higher abstraction. 57 float uncommittedWidth() const { return m_uncommittedWidth; } 58 float committedWidth() const { return m_committedWidth; } 59 float availableWidth() const { return m_availableWidth; } 60 float logicalLeftOffset() const { return m_left; } 61 62 void updateAvailableWidth(LayoutUnit minimumHeight = 0); 63 void shrinkAvailableWidthForNewFloatIfNeeded(FloatingObject*); 64 void addUncommittedWidth(float delta) { m_uncommittedWidth += delta; } 65 void commit(); 66 void applyOverhang(RenderRubyRun*, RenderObject* startRenderer, RenderObject* endRenderer); 67 void fitBelowFloats(bool isFirstLine = false); 68 void setTrailingWhitespaceWidth(float collapsedWhitespace, float borderPaddingMargin = 0); 69 bool shouldIndentText() const { return m_shouldIndentText == IndentText; } 70 71private: 72 void computeAvailableWidthFromLeftAndRight(); 73 bool fitsOnLineExcludingTrailingCollapsedWhitespace() const; 74 void updateLineDimension(LayoutUnit newLineTop, LayoutUnit newLineWidth, float newLineLeft, float newLineRight); 75#if ENABLE(CSS_SHAPES) 76 void wrapNextToShapeOutside(bool isFirstLine); 77#endif 78 79 RenderBlockFlow& m_block; 80 float m_uncommittedWidth; 81 float m_committedWidth; 82 float m_overhangWidth; // The amount by which |m_availableWidth| has been inflated to account for possible contraction due to ruby overhang. 83 float m_trailingWhitespaceWidth; 84 float m_trailingCollapsedWhitespaceWidth; 85 float m_left; 86 float m_right; 87 float m_availableWidth; 88 bool m_isFirstLine; 89 IndentTextOrNot m_shouldIndentText; 90}; 91 92IndentTextOrNot requiresIndent(bool isFirstLine, bool isAfterHardLineBreak, const RenderStyle&); 93 94} 95 96#endif // LineWidth_h 97