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 "core/accessibility/AXARIAGrid.h"
31
32#include "core/accessibility/AXObjectCache.h"
33#include "core/accessibility/AXTableColumn.h"
34#include "core/accessibility/AXTableRow.h"
35#include "core/rendering/RenderObject.h"
36
37
38namespace blink {
39
40AXARIAGrid::AXARIAGrid(RenderObject* renderer)
41    : AXTable(renderer)
42{
43}
44
45AXARIAGrid::~AXARIAGrid()
46{
47}
48
49PassRefPtr<AXARIAGrid> AXARIAGrid::create(RenderObject* renderer)
50{
51    return adoptRef(new AXARIAGrid(renderer));
52}
53
54bool AXARIAGrid::addTableCellChild(AXObject* child, HashSet<AXObject*>& appendedRows, unsigned& columnCount)
55{
56    if (!child || !child->isTableRow() || child->ariaRoleAttribute() != RowRole)
57        return false;
58
59    AXTableRow* row = toAXTableRow(child);
60    if (appendedRows.contains(row))
61        return false;
62
63    // store the maximum number of columns
64    unsigned rowCellCount = row->children().size();
65    if (rowCellCount > columnCount)
66        columnCount = rowCellCount;
67
68    row->setRowIndex((int)m_rows.size());
69    m_rows.append(row);
70
71    // Try adding the row if it's not ignoring accessibility,
72    // otherwise add its children (the cells) as the grid's children.
73    if (!row->accessibilityIsIgnored())
74        m_children.append(row);
75    else
76        m_children.appendVector(row->children());
77
78    appendedRows.add(row);
79    return true;
80}
81
82void AXARIAGrid::addChildren()
83{
84    ASSERT(!m_haveChildren);
85
86    if (!isAXTable()) {
87        AXRenderObject::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<AXObject*> appendedRows;
99    unsigned columnCount = 0;
100    for (RefPtr<AXObject> child = firstChild(); child; child = child->nextSibling()) {
101
102        if (!addTableCellChild(child.get(), appendedRows, columnCount)) {
103
104            // in case the render tree doesn't match the expected ARIA hierarchy, look at the children
105            if (!child->hasChildren())
106                child->addChildren();
107
108            // The children of this non-row will contain all non-ignored elements (recursing to find them).
109            // This allows the table to dive arbitrarily deep to find the rows.
110            AccessibilityChildrenVector children = child->children();
111            size_t length = children.size();
112            for (size_t i = 0; i < length; ++i)
113                addTableCellChild(children[i].get(), appendedRows, columnCount);
114        }
115    }
116
117    // make the columns based on the number of columns in the first body
118    for (unsigned i = 0; i < columnCount; ++i) {
119        AXTableColumn* column = toAXTableColumn(axCache->getOrCreate(ColumnRole));
120        column->setColumnIndex((int)i);
121        column->setParent(this);
122        m_columns.append(column);
123        if (!column->accessibilityIsIgnored())
124            m_children.append(column);
125    }
126
127    AXObject* headerContainerObject = headerContainer();
128    if (headerContainerObject && !headerContainerObject->accessibilityIsIgnored())
129        m_children.append(headerContainerObject);
130}
131
132} // namespace blink
133