1/*
2 * Copyright (C) 2009 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#ifndef RenderMathMLRoot_h
27#define RenderMathMLRoot_h
28
29#if ENABLE(MATHML)
30
31#include "RenderMathMLBlock.h"
32#include "RenderMathMLRow.h"
33
34namespace WebCore {
35
36class RenderMathMLRadicalOperator;
37class RenderMathMLRootWrapper;
38
39// Render base^(1/index), or sqrt(base) via the derived class RenderMathMLSquareRoot, using radical notation.
40class RenderMathMLRoot : public RenderMathMLBlock {
41
42friend class RenderMathMLRootWrapper;
43
44public:
45    RenderMathMLRoot(Element&, PassRef<RenderStyle>);
46    RenderMathMLRoot(Document&, PassRef<RenderStyle>);
47
48    virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) override;
49    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
50    virtual void updateFromElement() override;
51
52protected:
53    virtual void layout() override;
54
55    virtual void paint(PaintInfo&, const LayoutPoint&) override;
56
57private:
58    virtual bool isRenderMathMLRoot() const override final { return true; }
59    virtual const char* renderName() const override { return "RenderMathMLRoot"; }
60    virtual int firstLineBaseline() const override;
61    void updateStyle();
62    void restructureWrappers();
63
64    RenderMathMLRootWrapper* baseWrapper() const;
65    RenderMathMLBlock* radicalWrapper() const;
66    RenderMathMLRootWrapper* indexWrapper() const;
67    RenderMathMLRadicalOperator* radicalOperator() const;
68
69    LayoutUnit m_verticalGap;
70    LayoutUnit m_ruleThickness;
71    LayoutUnit m_extraAscender;
72    float m_degreeBottomRaisePercent;
73};
74
75RENDER_OBJECT_TYPE_CASTS(RenderMathMLRoot, isRenderMathMLRoot())
76
77// These are specific wrappers for the index and base, that ask the parent to restructure the renderers after child removal.
78class RenderMathMLRootWrapper : public RenderMathMLRow {
79
80friend class RenderMathMLRoot;
81
82public:
83    RenderMathMLRootWrapper(Document& document, PassRef<RenderStyle> style)
84        : RenderMathMLRow(document, WTF::move(style)) { }
85
86private:
87    RenderObject* removeChildWithoutRestructuring(RenderObject&);
88    RenderObject* removeChild(RenderObject&) override;
89    static RenderPtr<RenderMathMLRootWrapper> createAnonymousWrapper(RenderMathMLRoot* renderObject);
90    virtual bool isRenderMathMLRootWrapper() const override final { return true; }
91    virtual const char* renderName() const override { return "RenderMathMLRootWrapper"; }
92};
93
94RENDER_OBJECT_TYPE_CASTS(RenderMathMLRootWrapper, isRenderMathMLRootWrapper())
95
96}
97
98#endif // ENABLE(MATHML)
99
100#endif // RenderMathMLRoot_h
101