MathML preferred widths should not depend on layout information
[WebKit-https.git] / Source / WebCore / rendering / mathml / RenderMathMLRow.cpp
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
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24  */
25
26 #include "config.h"
27
28 #if ENABLE(MATHML)
29
30 #include "RenderMathMLRow.h"
31
32 #include "MathMLNames.h"
33 #include "RenderMathMLOperator.h"
34
35 namespace WebCore {
36
37 using namespace MathMLNames;
38
39 RenderMathMLRow::RenderMathMLRow(Element* element)
40     : RenderMathMLBlock(element)
41 {
42 }
43
44 // FIXME: Change all these createAnonymous... routines to return a PassOwnPtr<>.
45 RenderMathMLRow* RenderMathMLRow::createAnonymousWithParentRenderer(const RenderObject* parent)
46 {
47     RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), FLEX);
48     RenderMathMLRow* newMRow = new (parent->renderArena()) RenderMathMLRow(0);
49     newMRow->setDocumentForAnonymous(parent->document());
50     newMRow->setStyle(newStyle.release());
51     return newMRow;
52 }
53
54 int RenderMathMLRow::logicalHeightExcludingOperators()
55 {
56     int stretchLogicalHeight = 0;
57     for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
58         child->layoutIfNeeded();
59         // FIXME: Only skip renderMo if it is stretchy.
60         if (child->isRenderMathMLBlock() && toRenderMathMLBlock(child)->unembellishedOperator())
61             continue;
62         if (child->isBox()) {
63             stretchLogicalHeight = max<int>(stretchLogicalHeight, roundToInt(toRenderBox(child)->logicalHeight()));
64         }
65     }
66     if (!stretchLogicalHeight)
67         stretchLogicalHeight = style()->fontSize();
68     return stretchLogicalHeight;
69 }
70
71 void RenderMathMLRow::stretchOperatorsAndLayout(int stretchLogicalHeight)
72 {
73     for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
74         if (child->isRenderMathMLBlock()) {
75             if (RenderMathMLOperator* renderMo = toRenderMathMLBlock(child)->unembellishedOperator())
76                 renderMo->stretchToHeight(stretchLogicalHeight);
77         }
78     }
79     RenderMathMLBlock::layout();
80 }
81
82 void RenderMathMLRow::layout()
83 {
84     int beforeLayoutStretchLogicalHeight = logicalHeightExcludingOperators();
85     stretchOperatorsAndLayout(beforeLayoutStretchLogicalHeight);
86
87     // FIXME: This code shouldn't be necessary in theory, but sometimes with mtables,
88     // the height changes after we layout the row. Do a second pass so to make sure
89     // operators are stretched to the right height.
90     int afterLayoutStretchLogicalHeight = logicalHeightExcludingOperators();
91     if (afterLayoutStretchLogicalHeight != beforeLayoutStretchLogicalHeight)
92         stretchOperatorsAndLayout(afterLayoutStretchLogicalHeight);
93 }
94
95 }
96
97 #endif // ENABLE(MATHML)