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/platform/external/webkit/WebCore/accessibility/AccessibilityTableColumn.cpp

https://github.com/aharish/totoro-gb-opensource-update2
C++ | 185 lines | 111 code | 40 blank | 34 comment | 24 complexity | 9f5ddae6017fb6a62dde0b8b2568a7c2 MD5 | raw file
  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 "AXObjectCache.h"
 33#include "AccessibilityTableCell.h"
 34#include "HTMLNames.h"
 35#include "RenderTable.h"
 36#include "RenderTableCell.h"
 37#include "RenderTableSection.h"
 38
 39using namespace std;
 40
 41namespace WebCore {
 42    
 43using namespace HTMLNames;
 44
 45AccessibilityTableColumn::AccessibilityTableColumn()
 46    : m_parentTable(0)
 47{
 48}
 49
 50AccessibilityTableColumn::~AccessibilityTableColumn()
 51{
 52}    
 53
 54PassRefPtr<AccessibilityTableColumn> AccessibilityTableColumn::create()
 55{
 56    return adoptRef(new AccessibilityTableColumn());
 57}
 58
 59void AccessibilityTableColumn::setParentTable(AccessibilityTable* table)
 60{
 61    m_parentTable = table;
 62    
 63    clearChildren();
 64}
 65    
 66IntRect AccessibilityTableColumn::elementRect() const
 67{
 68    // this will be filled in when addChildren is called
 69    return m_columnRect;
 70}
 71
 72IntSize AccessibilityTableColumn::size() const
 73{
 74    return elementRect().size();
 75}
 76  
 77const AccessibilityObject::AccessibilityChildrenVector& AccessibilityTableColumn::children()
 78{
 79    if (!m_haveChildren)
 80        addChildren();
 81    return m_children;
 82}
 83    
 84AccessibilityObject* 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
124AccessibilityObject* 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    
161void 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