1/*
2 * Copyright (C) 2010 Alex Milowski (alex@milowski.com). 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 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
14 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
15 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
16 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
17 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
19 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#if ENABLE(MATHML)
29
30#include "MathMLOperatorDictionary.h"
31#include "MathOperator.h"
32#include "RenderMathMLToken.h"
33
34namespace WebCore {
35
36class MathMLOperatorElement;
37
38class RenderMathMLOperator : public RenderMathMLToken {
39 WTF_MAKE_ISO_ALLOCATED(RenderMathMLOperator);
40public:
41 RenderMathMLOperator(MathMLOperatorElement&, RenderStyle&&);
42 RenderMathMLOperator(Document&, RenderStyle&&);
43 MathMLOperatorElement& element() const;
44
45 void stretchTo(LayoutUnit heightAboveBaseline, LayoutUnit depthBelowBaseline);
46 void stretchTo(LayoutUnit width);
47 LayoutUnit stretchSize() const { return isVertical() ? m_stretchHeightAboveBaseline + m_stretchDepthBelowBaseline : m_stretchWidth; }
48 void resetStretchSize();
49 void setStretchWidthLocked(bool stretchWidthLocked) { m_isStretchWidthLocked = stretchWidthLocked; }
50 bool isStretchWidthLocked() const { return m_isStretchWidthLocked; }
51
52 virtual bool hasOperatorFlag(MathMLOperatorDictionary::Flag) const;
53 bool isLargeOperatorInDisplayStyle() const { return !hasOperatorFlag(MathMLOperatorDictionary::Stretchy) && hasOperatorFlag(MathMLOperatorDictionary::LargeOp) && mathMLStyle().displayStyle(); }
54 bool shouldMoveLimits() const { return hasOperatorFlag(MathMLOperatorDictionary::MovableLimits) && !mathMLStyle().displayStyle(); }
55 virtual bool isVertical() const;
56 LayoutUnit italicCorrection() const { return m_mathOperator.italicCorrection(); }
57
58 void updateTokenContent() final;
59 void updateFromElement() final;
60 virtual UChar32 textContent() const;
61 bool isStretchy() const { return textContent() && hasOperatorFlag(MathMLOperatorDictionary::Stretchy); }
62
63protected:
64 virtual void updateMathOperator();
65 virtual LayoutUnit leadingSpace() const;
66 virtual LayoutUnit trailingSpace() const;
67 virtual LayoutUnit minSize() const;
68 virtual LayoutUnit maxSize() const;
69 virtual bool useMathOperator() const;
70
71private:
72 void styleDidChange(StyleDifference, const RenderStyle* oldStyle) final;
73 void computePreferredLogicalWidths() final;
74 void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0_lu) final;
75 void paint(PaintInfo&, const LayoutPoint&) final;
76
77 const char* renderName() const final { return isAnonymous() ? "RenderMathMLOperator (anonymous)" : "RenderMathMLOperator"; }
78 void paintChildren(PaintInfo& forSelf, const LayoutPoint&, PaintInfo& forChild, bool usePrintRect) final;
79 bool isRenderMathMLOperator() const final { return true; }
80 bool isInvisibleOperator() const;
81
82 Optional<int> firstLineBaseline() const final;
83 RenderMathMLOperator* unembellishedOperator() const final { return const_cast<RenderMathMLOperator*>(this); }
84
85 LayoutUnit verticalStretchedOperatorShift() const;
86
87 LayoutUnit m_stretchHeightAboveBaseline { 0 };
88 LayoutUnit m_stretchDepthBelowBaseline { 0 };
89 LayoutUnit m_stretchWidth;
90 bool m_isStretchWidthLocked { false };
91
92 MathOperator m_mathOperator;
93};
94
95} // namespace WebCore
96
97SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderMathMLOperator, isRenderMathMLOperator())
98
99#endif // ENABLE(MATHML)
100