1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* Copyright (C) 2010 Alex Milowski (alex@milowski.com). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(MATHML)
#include "RenderMathMLRow.h"
#include "MathMLNames.h"
#include "RenderMathMLOperator.h"
namespace WebCore {
using namespace MathMLNames;
RenderMathMLRow::RenderMathMLRow(Node* row)
: RenderMathMLBlock(row)
{
}
int RenderMathMLRow::nonOperatorHeight() const
{
int maxHeight = 0;
for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
if (current->isRenderMathMLBlock()) {
RenderMathMLBlock* block = toRenderMathMLBlock(current);
int blockHeight = block->nonOperatorHeight();
// Check to see if this box has a larger height
if (blockHeight > maxHeight)
maxHeight = blockHeight;
} else if (current->isBoxModelObject()) {
RenderBoxModelObject* box = toRenderBoxModelObject(current);
// Check to see if this box has a larger height
if (box->offsetHeight() > maxHeight)
maxHeight = box->offsetHeight();
}
}
return maxHeight;
}
void RenderMathMLRow::layout()
{
RenderBlock::layout();
// Calculate the maximum height of the row without the operators.
int maxHeight = nonOperatorHeight();
// Set the maximum height of the row for intermediate layouts.
style()->setHeight(Length(maxHeight, Fixed));
// Notify contained operators they may need to re-layout their stretched operators.
// We need to keep track of the number of children and operators because a row of
// operators needs some special handling.
int childCount = 0;
int operatorCount = 0;
for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
childCount++;
if (current->isRenderMathMLBlock()) {
RenderMathMLBlock* block = toRenderMathMLBlock(current);
block->stretchToHeight(maxHeight);
if (block->isRenderMathMLOperator())
operatorCount++;
}
}
// Layout the non-operators which have just been stretched.
setNeedsLayoutAndPrefWidthsRecalc();
markContainingBlocksForLayout();
RenderBlock::layout();
// Make a second pass with the real height of the operators.
int operatorHeight = 0;
for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
if (current->isRenderMathMLBlock()) {
RenderMathMLBlock* block = toRenderMathMLBlock(current);
if (!block->hasBase() && !block->isRenderMathMLOperator()) {
// Check to see if this box has a larger height.
if (block->offsetHeight() > maxHeight)
maxHeight = block->offsetHeight();
}
if (block->isRenderMathMLOperator())
if (block->offsetHeight() > operatorHeight)
operatorHeight = block->offsetHeight();
} else if (current->isBoxModelObject()) {
RenderBoxModelObject* box = toRenderBoxModelObject(current);
// Check to see if this box has a larger height.
if (box->offsetHeight() > maxHeight)
maxHeight = box->offsetHeight();
}
}
if (childCount > 0 && childCount == operatorCount) {
// We have only operators and so set the max height to the operator height.
maxHeight = operatorHeight;
}
int stretchHeight = maxHeight;
// Stretch the operators again and re-calculate the row height.
for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
if (current->isRenderMathMLBlock()) {
RenderMathMLBlock* block = toRenderMathMLBlock(current);
if (block->isRenderMathMLOperator()) {
RenderMathMLOperator* mathop = toRenderMathMLOperator(block);
mathop->stretchToHeight(stretchHeight);
} else {
block->stretchToHeight(stretchHeight);
RenderBoxModelObject* box = toRenderBoxModelObject(current);
// Check to see if this box has a larger height
if (box->offsetHeight() > maxHeight)
maxHeight = box->offsetHeight();
}
} else if (current->isBoxModelObject()) {
RenderBoxModelObject* box = toRenderBoxModelObject(current);
// Check to see if this box has a larger height
if (box->offsetHeight() > maxHeight)
maxHeight = box->offsetHeight();
}
}
// Set the maximum height of the row based on the calculations.
style()->setHeight(Length(maxHeight, Fixed));
// Do the final layout by calling our parent's layout again.
setNeedsLayoutAndPrefWidthsRecalc();
markContainingBlocksForLayout();
RenderBlock::layout();
}
}
#endif // ENABLE(MATHML)
|
