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 "AccessibilityTableCell.h"
31
32 #include "AXObjectCache.h"
33 #include "HTMLNames.h"
34 #include "RenderObject.h"
35 #include "RenderTableCell.h"
36
37 using namespace std;
38
39 namespace WebCore {
40
41 using namespace HTMLNames;
42
AccessibilityTableCell(RenderObject * renderer)43 AccessibilityTableCell::AccessibilityTableCell(RenderObject* renderer)
44 : AccessibilityRenderObject(renderer)
45 {
46 }
47
~AccessibilityTableCell()48 AccessibilityTableCell::~AccessibilityTableCell()
49 {
50 }
51
create(RenderObject * renderer)52 PassRefPtr<AccessibilityTableCell> AccessibilityTableCell::create(RenderObject* renderer)
53 {
54 return adoptRef(new AccessibilityTableCell(renderer));
55 }
56
accessibilityIsIgnored() const57 bool AccessibilityTableCell::accessibilityIsIgnored() const
58 {
59 AccessibilityObjectInclusion decision = accessibilityIsIgnoredBase();
60 if (decision == IncludeObject)
61 return false;
62 if (decision == IgnoreObject)
63 return true;
64
65 if (!isTableCell())
66 return AccessibilityRenderObject::accessibilityIsIgnored();
67
68 return false;
69 }
70
parentTable() const71 AccessibilityObject* AccessibilityTableCell::parentTable() const
72 {
73 if (!m_renderer || !m_renderer->isTableCell())
74 return 0;
75
76 // Do not use getOrCreate. parentTable() can be called while the render tree is being modified
77 // by javascript, and creating a table element may try to access the render tree while in a bad state.
78 // By using only get() implies that the AXTable must be created before AXTableCells. This should
79 // always be the case when AT clients access a table.
80 // https://bugs.webkit.org/show_bug.cgi?id=42652
81 return axObjectCache()->get(toRenderTableCell(m_renderer)->table());
82 }
83
isTableCell() const84 bool AccessibilityTableCell::isTableCell() const
85 {
86 AccessibilityObject* table = parentTable();
87 if (!table || !table->isAccessibilityTable())
88 return false;
89
90 return true;
91 }
92
roleValue() const93 AccessibilityRole AccessibilityTableCell::roleValue() const
94 {
95 if (!isTableCell())
96 return AccessibilityRenderObject::roleValue();
97
98 return CellRole;
99 }
100
rowIndexRange(pair<int,int> & rowRange)101 void AccessibilityTableCell::rowIndexRange(pair<int, int>& rowRange)
102 {
103 if (!m_renderer || !m_renderer->isTableCell())
104 return;
105
106 RenderTableCell* renderCell = toRenderTableCell(m_renderer);
107 rowRange.first = renderCell->row();
108 rowRange.second = renderCell->rowSpan();
109
110 // since our table might have multiple sections, we have to offset our row appropriately
111 RenderTableSection* section = renderCell->section();
112 RenderTable* table = renderCell->table();
113 if (!table || !section)
114 return;
115
116 RenderTableSection* tableSection = table->header();
117 if (!tableSection)
118 tableSection = table->firstBody();
119
120 unsigned rowOffset = 0;
121 while (tableSection) {
122 if (tableSection == section)
123 break;
124 rowOffset += tableSection->numRows();
125 tableSection = table->sectionBelow(tableSection, true);
126 }
127
128 rowRange.first += rowOffset;
129 }
130
columnIndexRange(pair<int,int> & columnRange)131 void AccessibilityTableCell::columnIndexRange(pair<int, int>& columnRange)
132 {
133 if (!m_renderer || !m_renderer->isTableCell())
134 return;
135
136 RenderTableCell* renderCell = toRenderTableCell(m_renderer);
137 columnRange.first = renderCell->col();
138 columnRange.second = renderCell->colSpan();
139 }
140
titleUIElement() const141 AccessibilityObject* AccessibilityTableCell::titleUIElement() const
142 {
143 // Try to find if the first cell in this row is a <th>. If it is,
144 // then it can act as the title ui element. (This is only in the
145 // case when the table is not appearing as an AXTable.)
146 if (isTableCell() || !m_renderer || !m_renderer->isTableCell())
147 return 0;
148
149 // Table cells that are th cannot have title ui elements, since by definition
150 // they are title ui elements
151 Node* node = m_renderer->node();
152 if (node && node->hasTagName(thTag))
153 return 0;
154
155 RenderTableCell* renderCell = toRenderTableCell(m_renderer);
156
157 // If this cell is in the first column, there is no need to continue.
158 int col = renderCell->col();
159 if (!col)
160 return 0;
161
162 int row = renderCell->row();
163
164 RenderTableSection* section = renderCell->section();
165 if (!section)
166 return 0;
167
168 RenderTableCell* headerCell = section->primaryCellAt(row, 0);
169 if (!headerCell || headerCell == renderCell)
170 return 0;
171
172 Node* cellElement = headerCell->node();
173 if (!cellElement || !cellElement->hasTagName(thTag))
174 return 0;
175
176 return axObjectCache()->getOrCreate(headerCell);
177 }
178
179 } // namespace WebCore
180