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 "platform/LayoutUnit.h" 34 35 namespace WebCore { 36 37 class FloatingObject; 38 class RenderBlock; 39 class RenderObject; 40 class RenderRubyRun; 41 class RenderBlockFlow; 42 43 struct LineSegment; 44 45 enum IndentTextOrNot { DoNotIndentText, IndentText }; 46 47 class LineWidth { 48 public: 49 LineWidth(RenderBlockFlow&, bool isFirstLine, IndentTextOrNot shouldIndentText); 50 fitsOnLine()51 bool fitsOnLine() const { return currentWidth() <= (m_availableWidth + LayoutUnit::epsilon()); } fitsOnLine(float extra)52 bool fitsOnLine(float extra) const { return currentWidth() + extra <= (m_availableWidth + LayoutUnit::epsilon()); } 53 currentWidth()54 float currentWidth() const { return m_committedWidth + m_uncommittedWidth; } 55 // FIXME: We should eventually replace these three functions by ones that work on a higher abstraction. uncommittedWidth()56 float uncommittedWidth() const { return m_uncommittedWidth; } committedWidth()57 float committedWidth() const { return m_committedWidth; } availableWidth()58 float availableWidth() const { return m_availableWidth; } 59 60 void updateAvailableWidth(LayoutUnit minimumHeight = 0); 61 void shrinkAvailableWidthForNewFloatIfNeeded(FloatingObject*); addUncommittedWidth(float delta)62 void addUncommittedWidth(float delta) { m_uncommittedWidth += delta; } 63 void commit(); 64 void applyOverhang(RenderRubyRun*, RenderObject* startRenderer, RenderObject* endRenderer); 65 void fitBelowFloats(); 66 67 void updateCurrentShapeSegment(); 68 shouldIndentText()69 bool shouldIndentText() const { return m_shouldIndentText == IndentText; } 70 71 private: 72 void computeAvailableWidthFromLeftAndRight(); 73 74 RenderBlockFlow& m_block; 75 float m_uncommittedWidth; 76 float m_committedWidth; 77 float m_overhangWidth; // The amount by which |m_availableWidth| has been inflated to account for possible contraction due to ruby overhang. 78 float m_left; 79 float m_right; 80 float m_availableWidth; 81 const LineSegment* m_segment; 82 bool m_isFirstLine; 83 IndentTextOrNot m_shouldIndentText; 84 }; 85 86 } 87 88 #endif // LineWidth_h 89