WebCore/accessibility/AccessibilityTableCell.cpp

   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     if (!isTableCell())
  60         return AccessibilityRenderObject::accessibilityIsIgnored();
  61
  62     return false;
  63 }
  64
  65 AccessibilityObject* AccessibilityTableCell::parentTable() const
  66 {
  67     if (!m_renderer || !m_renderer->isTableCell())
  68         return false;
  69
  70     return axObjectCache()->getOrCreate(toRenderTableCell(m_renderer)->table());
  71 }
  72
  73 bool AccessibilityTableCell::isTableCell() const
  74 {
  75     AccessibilityObject* table = parentTable();
  76     if (!table || !table->isDataTable())
  77         return false;
  78
  79     return true;
  80 }
  81
  82 AccessibilityRole AccessibilityTableCell::roleValue() const
  83 {
  84     if (!isTableCell())
  85         return AccessibilityRenderObject::roleValue();
  86
  87     return CellRole;
  88 }
  89
  90 void AccessibilityTableCell::rowIndexRange(pair<int, int>& rowRange)
  91 {
  92     if (!m_renderer || !m_renderer->isTableCell())
  93         return;
  94
  95     RenderTableCell* renderCell = toRenderTableCell(m_renderer);
  96     rowRange.first = renderCell->row();
  97     rowRange.second = renderCell->rowSpan();
  98
  99     // since our table might have multiple sections, we have to offset our row appropriately
 100     RenderTableSection* section = renderCell->section();
 101     RenderTable* table = renderCell->table();
 102     if (!table || !section)
 103         return;
 104
 105     RenderTableSection* tableSection = table->header();
 106     if (!tableSection)
 107         tableSection = table->firstBody();
 108
 109     unsigned rowOffset = 0;
 110     while (tableSection) {
 111         if (tableSection == section)
 112             break;
 113         rowOffset += tableSection->numRows();
 114         tableSection = table->sectionBelow(tableSection, true);
 115     }
 116
 117     rowRange.first += rowOffset;
 118 }
 119
 120 void AccessibilityTableCell::columnIndexRange(pair<int, int>& columnRange)
 121 {
 122     if (!m_renderer || !m_renderer->isTableCell())
 123         return;
 124
 125     RenderTableCell* renderCell = toRenderTableCell(m_renderer);
 126     columnRange.first = renderCell->col();
 127     columnRange.second = renderCell->colSpan();
 128 }
 129
 130 AccessibilityObject* AccessibilityTableCell::titleUIElement() const
 131 {
 132     // Try to find if the first cell in this row is a <th>. If it is,
 133     // then it can act as the title ui element. (This is only in the
 134     // case when the table is not appearing as an AXTable.)
 135     if (isTableCell() || !m_renderer || !m_renderer->isTableCell())
 136         return 0;
 137
 138     // Table cells that are th cannot have title ui elements, since by definition
 139     // they are title ui elements
 140     Node* node = m_renderer->node();
 141     if (node && node->hasTagName(thTag))
 142         return 0;
 143
 144     RenderTableCell* renderCell = toRenderTableCell(m_renderer);
 145
 146     // If this cell is in the first column, there is no need to continue.
 147     int col = renderCell->col();
 148     if (!col)
 149         return 0;
 150
 151     int row = renderCell->row();
 152
 153     RenderTableSection* section = renderCell->section();
 154     if (!section)
 155         return 0;
 156
 157     RenderTableCell* headerCell = section->cellAt(row, 0).cell;
 158     if (!headerCell || headerCell == renderCell)
 159         return 0;
 160
 161     Node* cellElement = headerCell->node();
 162     if (!cellElement || !cellElement->hasTagName(thTag))
 163         return 0;
 164
 165     return axObjectCache()->getOrCreate(headerCell);
 166 }
 167
 168 } // namespace WebCore