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 #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
RenderMathMLRow(Node * row)39 RenderMathMLRow::RenderMathMLRow(Node* row)
40 : RenderMathMLBlock(row)
41 {
42 }
43
nonOperatorHeight() const44 int RenderMathMLRow::nonOperatorHeight() const
45 {
46 int maxHeight = 0;
47 for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
48 if (current->isRenderMathMLBlock()) {
49 RenderMathMLBlock* block = toRenderMathMLBlock(current);
50 int blockHeight = block->nonOperatorHeight();
51 // Check to see if this box has a larger height
52 if (blockHeight > maxHeight)
53 maxHeight = blockHeight;
54 } else if (current->isBoxModelObject()) {
55 RenderBoxModelObject* box = toRenderBoxModelObject(current);
56 // Check to see if this box has a larger height
57 if (box->offsetHeight() > maxHeight)
58 maxHeight = box->offsetHeight();
59 }
60
61 }
62 return maxHeight;
63 }
64
layout()65 void RenderMathMLRow::layout()
66 {
67 RenderBlock::layout();
68
69 int maxHeight = 0;
70 int childCount = 0;
71 int operatorCount = 0;
72
73 // Calculate the non-operator max height of the row.
74 int operatorHeight = 0;
75 for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
76 childCount++;
77 if (current->isRenderMathMLBlock()) {
78 RenderMathMLBlock* block = toRenderMathMLBlock(current);
79 // Check to see if the non-operator block has a greater height.
80 if (!block->hasBase() && !block->isRenderMathMLOperator() && block->offsetHeight() > maxHeight)
81 maxHeight = block->offsetHeight();
82 if (block->hasBase() && block->nonOperatorHeight() > maxHeight)
83 maxHeight = block->nonOperatorHeight();
84 // If the block is an operator, capture the maximum height and increment the count.
85 if (block->isRenderMathMLOperator()) {
86 if (block->offsetHeight() > operatorHeight)
87 operatorHeight = block->offsetHeight();
88 operatorCount++;
89 }
90 } else if (current->isBoxModelObject()) {
91 RenderBoxModelObject* box = toRenderBoxModelObject(current);
92 // Check to see if this box has a larger height.
93 if (box->offsetHeight() > maxHeight)
94 maxHeight = box->offsetHeight();
95 }
96 }
97
98 if (childCount > 0 && childCount == operatorCount) {
99 // We have only operators and so set the max height to the operator height.
100 maxHeight = operatorHeight;
101 }
102
103 // Stretch everything to the same height (blocks can ignore the request).
104 if (maxHeight > 0) {
105 bool didStretch = false;
106 for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
107 if (current->isRenderMathMLBlock()) {
108 RenderMathMLBlock* block = toRenderMathMLBlock(current);
109 block->stretchToHeight(maxHeight);
110 didStretch = true;
111 }
112 }
113 if (didStretch) {
114 setNeedsLayout(true);
115 setPreferredLogicalWidthsDirty(true, false);
116 RenderBlock::layout();
117 }
118 }
119
120 }
121
baselinePosition(FontBaseline,bool firstLine,LineDirectionMode direction,LinePositionMode linePositionMode) const122 int RenderMathMLRow::baselinePosition(FontBaseline, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
123 {
124 if (firstChild() && firstChild()->isRenderMathMLBlock()) {
125 RenderMathMLBlock* block = toRenderMathMLBlock(firstChild());
126 if (block->isRenderMathMLOperator())
127 return block->y() + block->baselinePosition(AlphabeticBaseline, firstLine, direction, linePositionMode);
128 }
129
130 return RenderBlock::baselinePosition(AlphabeticBaseline, firstLine, direction, linePositionMode);
131 }
132
133 }
134
135 #endif // ENABLE(MATHML)
136
137