1 /*
2 * Copyright (C) 2009 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 "AccessibilityARIAGrid.h"
31
32 #include "AccessibilityTableCell.h"
33 #include "AccessibilityTableColumn.h"
34 #include "AccessibilityTableHeaderContainer.h"
35 #include "AccessibilityTableRow.h"
36 #include "AXObjectCache.h"
37 #include "RenderObject.h"
38
39 using namespace std;
40
41 namespace WebCore {
42
AccessibilityARIAGrid(RenderObject * renderer)43 AccessibilityARIAGrid::AccessibilityARIAGrid(RenderObject* renderer)
44 : AccessibilityTable(renderer)
45 {
46 #if ACCESSIBILITY_TABLES
47 m_isAccessibilityTable = true;
48 #else
49 m_isAccessibilityTable = false;
50 #endif
51 }
52
~AccessibilityARIAGrid()53 AccessibilityARIAGrid::~AccessibilityARIAGrid()
54 {
55 }
56
create(RenderObject * renderer)57 PassRefPtr<AccessibilityARIAGrid> AccessibilityARIAGrid::create(RenderObject* renderer)
58 {
59 return adoptRef(new AccessibilityARIAGrid(renderer));
60 }
61
addChild(AccessibilityObject * child,HashSet<AccessibilityObject * > & appendedRows,unsigned & columnCount)62 void AccessibilityARIAGrid::addChild(AccessibilityObject* child, HashSet<AccessibilityObject*>& appendedRows, unsigned& columnCount)
63 {
64 if (!child || !child->isTableRow() || child->ariaRoleAttribute() != RowRole)
65 return;
66
67 AccessibilityTableRow* row = static_cast<AccessibilityTableRow*>(child);
68 if (appendedRows.contains(row))
69 return;
70
71 // store the maximum number of columns
72 unsigned rowCellCount = row->children().size();
73 if (rowCellCount > columnCount)
74 columnCount = rowCellCount;
75
76 row->setRowIndex((int)m_rows.size());
77 m_rows.append(row);
78 m_children.append(row);
79 appendedRows.add(row);
80 }
81
addChildren()82 void AccessibilityARIAGrid::addChildren()
83 {
84 ASSERT(!m_haveChildren);
85
86 if (!isDataTable()) {
87 AccessibilityRenderObject::addChildren();
88 return;
89 }
90
91 m_haveChildren = true;
92 if (!m_renderer)
93 return;
94
95 AXObjectCache* axCache = m_renderer->document()->axObjectCache();
96
97 // add only rows that are labeled as aria rows
98 HashSet<AccessibilityObject*> appendedRows;
99 unsigned columnCount = 0;
100 for (RefPtr<AccessibilityObject> child = firstChild(); child; child = child->nextSibling()) {
101
102 // in case the render tree doesn't match the expected ARIA hierarchy, look at the children
103 if (child->accessibilityIsIgnored()) {
104 if (!child->hasChildren())
105 child->addChildren();
106
107 AccessibilityChildrenVector children = child->children();
108 unsigned length = children.size();
109 for (unsigned i = 0; i < length; ++i)
110 addChild(children[i].get(), appendedRows, columnCount);
111 } else
112 addChild(child.get(), appendedRows, columnCount);
113 }
114
115 // make the columns based on the number of columns in the first body
116 for (unsigned i = 0; i < columnCount; ++i) {
117 AccessibilityTableColumn* column = static_cast<AccessibilityTableColumn*>(axCache->getOrCreate(ColumnRole));
118 column->setColumnIndex((int)i);
119 column->setParentTable(this);
120 m_columns.append(column);
121 m_children.append(column);
122 }
123
124 AccessibilityObject* headerContainerObject = headerContainer();
125 if (headerContainerObject)
126 m_children.append(headerContainerObject);
127 }
128
cellForColumnAndRow(unsigned column,unsigned row)129 AccessibilityTableCell* AccessibilityARIAGrid::cellForColumnAndRow(unsigned column, unsigned row)
130 {
131 if (!m_renderer)
132 return 0;
133
134 if (!hasChildren())
135 addChildren();
136
137 if (column >= columnCount() || row >= rowCount())
138 return 0;
139
140 AccessibilityObject *tableRow = m_rows[row].get();
141 if (!tableRow)
142 return 0;
143
144 AccessibilityChildrenVector children = tableRow->children();
145 // in case this row had fewer columns than other rows
146 AccessibilityObject* tableCell = 0;
147 if (column >= children.size())
148 return 0;
149
150 tableCell = children[column].get();
151 return static_cast<AccessibilityTableCell*>(tableCell);
152 }
153
154 } // namespace WebCore
155