1/*
2 * Copyright (C) 2014 Gurpreet Kaur (k.gurpreet@samsung.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#define _USE_MATH_DEFINES 1
27#include "config.h"
28
29#if ENABLE(MATHML)
30#include "RenderMathMLMenclose.h"
31
32#include "GraphicsContext.h"
33#include "MathMLMencloseElement.h"
34#include "PaintInfo.h"
35#include "RenderMathMLSquareRoot.h"
36#include <wtf/MathExtras.h>
37
38namespace WebCore {
39
40using namespace MathMLNames;
41
42RenderMathMLMenclose::RenderMathMLMenclose(Element& element, PassRef<RenderStyle> style)
43    : RenderMathMLRow(element, WTF::move(style))
44{
45}
46
47void RenderMathMLMenclose::addChild(RenderObject* newChild, RenderObject* beforeChild)
48{
49    MathMLMencloseElement* menclose = toMathMLMencloseElement(element());
50    // Allow an anonymous RenderMathMLSquareRoot to handle drawing the radical
51    // notation, rather than duplicating the code needed to paint a root.
52    if (!firstChild() && menclose->isRadical())
53        RenderMathMLBlock::addChild(RenderMathMLSquareRoot::createAnonymousWithParentRenderer(*this).leakPtr());
54
55    if (newChild) {
56        if (firstChild() && menclose->isRadical())
57            toRenderElement(firstChild())->addChild(newChild, beforeChild && beforeChild->parent() == firstChild() ? beforeChild : nullptr);
58        else
59            RenderMathMLBlock::addChild(newChild, beforeChild);
60    }
61}
62
63void RenderMathMLMenclose::computePreferredLogicalWidths()
64{
65    ASSERT(preferredLogicalWidthsDirty());
66
67    RenderMathMLBlock::computePreferredLogicalWidths();
68    const int paddingTop = 6;
69
70    MathMLMencloseElement* menclose = toMathMLMencloseElement(element());
71    const Vector<String>& notationValues = menclose->notationValues();
72    size_t notationalValueSize = notationValues.size();
73    for (size_t i = 0; i < notationalValueSize; i++) {
74        if (notationValues[i] == "circle") {
75            m_minPreferredLogicalWidth = minPreferredLogicalWidth() * float(M_SQRT2);
76            m_maxPreferredLogicalWidth = maxPreferredLogicalWidth() * float(M_SQRT2);
77        }
78    }
79
80    if (menclose->isDefaultLongDiv()) {
81        style().setPaddingTop(Length(paddingTop, Fixed));
82        style().setPaddingLeft(Length(menclose->longDivLeftPadding().toInt(), Fixed));
83    }
84    setPreferredLogicalWidthsDirty(false);
85}
86
87void RenderMathMLMenclose::updateLogicalHeight()
88{
89    MathMLMencloseElement* menclose = toMathMLMencloseElement(element());
90    const Vector<String>& notationValues = menclose->notationValues();
91    size_t notationalValueSize = notationValues.size();
92    for (size_t i = 0; i < notationalValueSize; i++)
93        if (notationValues[i] == "circle")
94            setLogicalHeight(logicalHeight() * float(M_SQRT2));
95}
96
97void RenderMathMLMenclose::paint(PaintInfo& info, const LayoutPoint& paintOffset)
98{
99    RenderMathMLBlock::paint(info, paintOffset);
100
101    if (info.context->paintingDisabled() || info.phase != PaintPhaseForeground || style().visibility() != VISIBLE)
102        return;
103
104    MathMLMencloseElement* menclose = toMathMLMencloseElement(element());
105    const Vector<String>& notationValues = menclose->notationValues();
106    size_t notationalValueSize = notationValues.size();
107    bool isDefaultLongDiv = menclose->isDefaultLongDiv();
108    if ((notationalValueSize && checkNotationalValuesValidity(notationValues)) || isDefaultLongDiv) {
109        IntRect rect = absoluteBoundingBoxRect();
110        int left = rect.x();
111        int top = rect.y();
112        int boxWidth = rect.width();
113        int boxHeight = rect.height();
114        int halfboxWidth = rect.width() / 2;
115        int halfboxHeight = rect.height() / 2;
116
117        GraphicsContextStateSaver stateSaver(*info.context);
118        info.context->setStrokeThickness(1);
119        info.context->setStrokeStyle(SolidStroke);
120        info.context->setStrokeColor(style().visitedDependentColor(CSSPropertyColor), ColorSpaceDeviceRGB);
121        // TODO add support for notation value updiagonalarrow https://bugs.webkit.org/show_bug.cgi?id=127466
122        for (size_t i = 0; i < notationalValueSize; i++) {
123            if (notationValues[i] == "updiagonalstrike")
124                info.context->drawLine(IntPoint(left, top + boxHeight), IntPoint(left + boxWidth, top));
125            else if (notationValues[i] == "downdiagonalstrike")
126                info.context->drawLine(IntPoint(left, top), IntPoint(left + boxWidth, top + boxHeight));
127            else if (notationValues[i] == "verticalstrike")
128                info.context->drawLine(IntPoint(left + halfboxWidth, top), IntPoint(left + halfboxWidth, top + boxHeight));
129            else if (notationValues[i] == "horizontalstrike")
130                info.context->drawLine(IntPoint(left, top + halfboxHeight), IntPoint(left + boxWidth, top + halfboxHeight));
131            else if (notationValues[i] == "circle") {
132                info.context->setFillColor(Color::transparent, ColorSpaceDeviceRGB);
133                info.context->drawEllipse(rect);
134            } else if (notationValues[i] == "longdiv")
135                isDefaultLongDiv = true;
136        }
137        if (isDefaultLongDiv) {
138            Path root;
139            int midxPoint = 0;
140            root.moveTo(FloatPoint(left, top));
141            int childLeft = firstChild() ? firstChild()->absoluteBoundingBoxRect().x() : 0;
142            if (childLeft)
143                midxPoint= childLeft - left;
144            else
145                midxPoint = style().paddingLeft().value();
146            root.addBezierCurveTo(FloatPoint(left, top), FloatPoint(left + midxPoint, top + halfboxHeight), FloatPoint(left, top + boxHeight));
147            info.context->strokePath(root);
148            if (isDefaultLongDiv)
149                info.context->drawLine(IntPoint(left, top), IntPoint(left + boxWidth + midxPoint, top));
150        }
151    }
152}
153
154bool RenderMathMLMenclose::checkNotationalValuesValidity(const Vector<String>& attr) const
155{
156    size_t attrSize = attr.size();
157    for (size_t i = 0; i < attrSize; i++) {
158        if (attr[i] == "updiagonalstrike" || attr[i] == "downdiagonalstrike" || attr[i] == "horizontalstrike" || attr[i] == "verticalstrike"
159            || attr[i] == "circle" || attr[i] == "longdiv")
160            return true;
161    }
162    return false;
163}
164
165}
166#endif // ENABLE(MATHML)
167