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 "AccessibilityTableRow.h"
31
32#include "AXObjectCache.h"
33#include "AccessibilityTableCell.h"
34#include "HTMLNames.h"
35#include "HTMLTableRowElement.h"
36#include "RenderObject.h"
37#include "RenderTableCell.h"
38#include "RenderTableRow.h"
39
40using namespace std;
41
42namespace WebCore {
43
44using namespace HTMLNames;
45
46AccessibilityTableRow::AccessibilityTableRow(RenderObject* renderer)
47    : AccessibilityRenderObject(renderer)
48{
49}
50
51AccessibilityTableRow::~AccessibilityTableRow()
52{
53}
54
55PassRefPtr<AccessibilityTableRow> AccessibilityTableRow::create(RenderObject* renderer)
56{
57    return adoptRef(new AccessibilityTableRow(renderer));
58}
59
60AccessibilityRole AccessibilityTableRow::determineAccessibilityRole()
61{
62    if (!isTableRow())
63        return AccessibilityRenderObject::determineAccessibilityRole();
64
65    m_ariaRole = determineAriaRoleAttribute();
66
67    AccessibilityRole ariaRole = ariaRoleAttribute();
68    if (ariaRole != UnknownRole)
69        return ariaRole;
70
71    return RowRole;
72}
73
74bool AccessibilityTableRow::isTableRow() const
75{
76    AccessibilityObject* table = parentTable();
77    if (!table || !table->isAccessibilityTable())
78        return false;
79
80    return true;
81}
82
83AccessibilityObject* AccessibilityTableRow::observableObject() const
84{
85    // This allows the table to be the one who sends notifications about tables.
86    return parentTable();
87}
88
89bool AccessibilityTableRow::computeAccessibilityIsIgnored() const
90{
91    AccessibilityObjectInclusion decision = defaultObjectInclusion();
92    if (decision == IncludeObject)
93        return false;
94    if (decision == IgnoreObject)
95        return true;
96
97    if (!isTableRow())
98        return AccessibilityRenderObject::computeAccessibilityIsIgnored();
99
100    return false;
101}
102
103AccessibilityObject* AccessibilityTableRow::parentTable() const
104{
105    // The parent table might not be the direct ancestor of the row unfortunately. ARIA states that role="grid" should
106    // only have "row" elements, but if not, we still should handle it gracefully by finding the right table.
107    for (AccessibilityObject* parent = parentObject(); parent; parent = parent->parentObject()) {
108        // If this is a table object, but not an accessibility table, we should stop because we don't want to
109        // choose another ancestor table as this row's table.
110        if (parent->isTable())
111            return parent->isAccessibilityTable() ? parent : 0;
112    }
113
114    return 0;
115}
116
117AccessibilityObject* AccessibilityTableRow::headerObject()
118{
119    if (!m_renderer || !m_renderer->isTableRow())
120        return 0;
121
122    AccessibilityChildrenVector rowChildren = children();
123    if (!rowChildren.size())
124        return 0;
125
126    // check the first element in the row to see if it is a TH element
127    AccessibilityObject* cell = rowChildren[0].get();
128    if (!cell->isTableCell())
129        return 0;
130
131    RenderObject* cellRenderer = static_cast<AccessibilityTableCell*>(cell)->renderer();
132    if (!cellRenderer)
133        return 0;
134
135    Node* cellNode = cellRenderer->node();
136    if (!cellNode || !cellNode->hasTagName(thTag))
137        return 0;
138
139    return cell;
140}
141
142} // namespace WebCore
143