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