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
35namespace WebCore {
36
37class FloatingObject;
38class RenderBlock;
39class RenderObject;
40class RenderRubyRun;
41class RenderBlockFlow;
42
43struct LineSegment;
44
45enum IndentTextOrNot { DoNotIndentText, IndentText };
46
47class LineWidth {
48public:
49    LineWidth(RenderBlockFlow&, bool isFirstLine, IndentTextOrNot shouldIndentText);
50
51    bool fitsOnLine() const { return currentWidth() <= (m_availableWidth + LayoutUnit::epsilon()); }
52    bool fitsOnLine(float extra) const { return currentWidth() + extra <= (m_availableWidth + LayoutUnit::epsilon()); }
53
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.
56    float uncommittedWidth() const { return m_uncommittedWidth; }
57    float committedWidth() const { return m_committedWidth; }
58    float availableWidth() const { return m_availableWidth; }
59
60    void updateAvailableWidth(LayoutUnit minimumHeight = 0);
61    void shrinkAvailableWidthForNewFloatIfNeeded(FloatingObject*);
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
69    bool shouldIndentText() const { return m_shouldIndentText == IndentText; }
70
71private:
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