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 blink { 36 37 class FloatingObject; 38 class RenderObject; 39 class RenderRubyRun; 40 class RenderBlockFlow; 41 42 enum IndentTextOrNot { DoNotIndentText, IndentText }; 43 enum WhitespaceTreatment { ExcludeWhitespace, IncludeWhitespace }; 44 45 class LineWidth { 46 public: 47 LineWidth(RenderBlockFlow&, bool isFirstLine, IndentTextOrNot shouldIndentText); 48 49 bool fitsOnLine() const { return currentWidth() <= (m_availableWidth + LayoutUnit::epsilon()); } 50 bool fitsOnLine(float extra) const { return currentWidth() + extra <= (m_availableWidth + LayoutUnit::epsilon()); } 51 bool fitsOnLine(float extra, WhitespaceTreatment whitespaceTreatment) const 52 { 53 return currentWidth() - (whitespaceTreatment == ExcludeWhitespace ? trailingWhitespaceWidth() : 0) + extra <= (m_availableWidth + LayoutUnit::epsilon()); 54 } 55 56 float currentWidth() const { return m_committedWidth + m_uncommittedWidth; } 57 // FIXME: We should eventually replace these three functions by ones that work on a higher abstraction. 58 float uncommittedWidth() const { return m_uncommittedWidth; } 59 float committedWidth() const { return m_committedWidth; } 60 float availableWidth() const { return m_availableWidth; } 61 float trailingWhitespaceWidth() const { return m_trailingWhitespaceWidth; } 62 63 void updateAvailableWidth(LayoutUnit minimumHeight = 0); 64 void shrinkAvailableWidthForNewFloatIfNeeded(FloatingObject*); 65 void addUncommittedWidth(float delta) { m_uncommittedWidth += delta; } 66 void commit(); 67 void applyOverhang(RenderRubyRun*, RenderObject* startRenderer, RenderObject* endRenderer); 68 void fitBelowFloats(bool isFirstLine = false); 69 void setTrailingWhitespaceWidth(float width) { m_trailingWhitespaceWidth = width; } 70 71 bool shouldIndentText() const { return m_shouldIndentText == IndentText; } 72 73 private: 74 void computeAvailableWidthFromLeftAndRight(); 75 void updateLineDimension(LayoutUnit newLineTop, LayoutUnit newLineWidth, const float& newLineLeft, const float& newLineRight); 76 void wrapNextToShapeOutside(bool isFirstLine); 77 78 RenderBlockFlow& m_block; 79 float m_uncommittedWidth; 80 float m_committedWidth; 81 float m_overhangWidth; // The amount by which |m_availableWidth| has been inflated to account for possible contraction due to ruby overhang. 82 float m_trailingWhitespaceWidth; 83 float m_left; 84 float m_right; 85 float m_availableWidth; 86 bool m_isFirstLine; 87 IndentTextOrNot m_shouldIndentText; 88 }; 89 90 } 91 92 #endif // LineWidth_h 93
