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 43 AccessibilityTableCell::AccessibilityTableCell(RenderObject* renderer) 44 : AccessibilityRenderObject(renderer) 45 { 46 } 47 48 AccessibilityTableCell::~AccessibilityTableCell() 49 { 50 } 51 52 PassRefPtr<AccessibilityTableCell> AccessibilityTableCell::create(RenderObject* renderer) 53 { 54 return adoptRef(new AccessibilityTableCell(renderer)); 55 } 56 57 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 71 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 84 bool AccessibilityTableCell::isTableCell() const 85 { 86 AccessibilityObject* table = parentTable(); 87 if (!table || !table->isAccessibilityTable()) 88 return false; 89 90 return true; 91 } 92 93 AccessibilityRole AccessibilityTableCell::roleValue() const 94 { 95 if (!isTableCell()) 96 return AccessibilityRenderObject::roleValue(); 97 98 return CellRole; 99 } 100 101 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 } 130 131 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 } 140 141 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
