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      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
    169