1 /*
2 * Copyright (C) 2008 Apple Inc. 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 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "config.h"
30 #include "AccessibilityTableColumn.h"
31
32 #include "AccessibilityTableCell.h"
33 #include "AXObjectCache.h"
34 #include "HTMLNames.h"
35 #include "RenderTable.h"
36 #include "RenderTableSection.h"
37 #include "RenderTableCell.h"
38
39 using namespace std;
40
41 namespace WebCore {
42
43 using namespace HTMLNames;
44
AccessibilityTableColumn()45 AccessibilityTableColumn::AccessibilityTableColumn()
46 : m_parentTable(0)
47 {
48 }
49
~AccessibilityTableColumn()50 AccessibilityTableColumn::~AccessibilityTableColumn()
51 {
52 }
53
create()54 PassRefPtr<AccessibilityTableColumn> AccessibilityTableColumn::create()
55 {
56 return adoptRef(new AccessibilityTableColumn());
57 }
58
setParentTable(AccessibilityTable * table)59 void AccessibilityTableColumn::setParentTable(AccessibilityTable* table)
60 {
61 m_parentTable = table;
62
63 clearChildren();
64 }
65
elementRect() const66 IntRect AccessibilityTableColumn::elementRect() const
67 {
68 // this will be filled in when addChildren is called
69 return m_columnRect;
70 }
71
size() const72 IntSize AccessibilityTableColumn::size() const
73 {
74 return elementRect().size();
75 }
76
children()77 const AccessibilityObject::AccessibilityChildrenVector& AccessibilityTableColumn::children()
78 {
79 if (!m_haveChildren)
80 addChildren();
81 return m_children;
82 }
83
headerObject()84 AccessibilityObject* AccessibilityTableColumn::headerObject()
85 {
86 if (!m_parentTable)
87 return 0;
88
89 RenderObject* renderer = m_parentTable->renderer();
90 if (!renderer)
91 return 0;
92
93 if (m_parentTable->isAriaTable()) {
94 AccessibilityChildrenVector rowChildren = children();
95 unsigned childrenCount = rowChildren.size();
96 for (unsigned i = 0; i < childrenCount; ++i) {
97 AccessibilityObject* cell = rowChildren[i].get();
98 if (cell->ariaRoleAttribute() == ColumnHeaderRole)
99 return cell;
100 }
101
102 return 0;
103 }
104
105 if (!renderer->isTable())
106 return 0;
107
108 RenderTable* table = toRenderTable(renderer);
109
110 AccessibilityObject* headerObject = 0;
111
112 // try the <thead> section first. this doesn't require th tags
113 headerObject = headerObjectForSection(table->header(), false);
114
115 if (headerObject)
116 return headerObject;
117
118 // now try for <th> tags in the first body
119 headerObject = headerObjectForSection(table->firstBody(), true);
120
121 return headerObject;
122 }
123
headerObjectForSection(RenderTableSection * section,bool thTagRequired)124 AccessibilityObject* AccessibilityTableColumn::headerObjectForSection(RenderTableSection* section, bool thTagRequired)
125 {
126 if (!section)
127 return 0;
128
129 int numCols = section->numColumns();
130 if (m_columnIndex >= numCols)
131 return 0;
132
133 RenderTableCell* cell = 0;
134 // also account for cells that have a span
135 for (int testCol = m_columnIndex; testCol >= 0; --testCol) {
136 RenderTableCell* testCell = section->cellAt(0, testCol).cell;
137 if (!testCell)
138 continue;
139
140 // we've reached a cell that doesn't even overlap our column
141 // it can't be our header
142 if ((testCell->col() + (testCell->colSpan()-1)) < m_columnIndex)
143 break;
144
145 Node* node = testCell->node();
146 if (!node)
147 continue;
148
149 if (thTagRequired && !node->hasTagName(thTag))
150 continue;
151
152 cell = testCell;
153 }
154
155 if (!cell)
156 return 0;
157
158 return m_parentTable->axObjectCache()->getOrCreate(cell);
159 }
160
addChildren()161 void AccessibilityTableColumn::addChildren()
162 {
163 ASSERT(!m_haveChildren);
164
165 m_haveChildren = true;
166 if (!m_parentTable)
167 return;
168
169 int numRows = m_parentTable->rowCount();
170
171 for (int i = 0; i < numRows; i++) {
172 AccessibilityTableCell* cell = m_parentTable->cellForColumnAndRow(m_columnIndex, i);
173 if (!cell)
174 continue;
175
176 // make sure the last one isn't the same as this one (rowspan cells)
177 if (m_children.size() > 0 && m_children.last() == cell)
178 continue;
179
180 m_children.append(cell);
181 m_columnRect.unite(cell->elementRect());
182 }
183 }
184
185 } // namespace WebCore
186