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      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 "AccessibilityARIAGrid.h"
     31 
     32 #include "AXObjectCache.h"
     33 #include "AccessibilityTableCell.h"
     34 #include "AccessibilityTableColumn.h"
     35 #include "AccessibilityTableHeaderContainer.h"
     36 #include "AccessibilityTableRow.h"
     37 #include "RenderObject.h"
     38 
     39 using namespace std;
     40 
     41 namespace WebCore {
     42 
     43 AccessibilityARIAGrid::AccessibilityARIAGrid(RenderObject* renderer)
     44     : AccessibilityTable(renderer)
     45 {
     46 #if ACCESSIBILITY_TABLES
     47     m_isAccessibilityTable = true;
     48 #else
     49     m_isAccessibilityTable = false;
     50 #endif
     51 }
     52 
     53 AccessibilityARIAGrid::~AccessibilityARIAGrid()
     54 {
     55 }
     56 
     57 PassRefPtr<AccessibilityARIAGrid> AccessibilityARIAGrid::create(RenderObject* renderer)
     58 {
     59     return adoptRef(new AccessibilityARIAGrid(renderer));
     60 }
     61 
     62 void AccessibilityARIAGrid::addChild(AccessibilityObject* child, HashSet<AccessibilityObject*>& appendedRows, unsigned& columnCount)
     63 {
     64     if (!child || !child->isTableRow() || child->ariaRoleAttribute() != RowRole)
     65         return;
     66 
     67     AccessibilityTableRow* row = static_cast<AccessibilityTableRow*>(child);
     68     if (appendedRows.contains(row))
     69         return;
     70 
     71     // store the maximum number of columns
     72     unsigned rowCellCount = row->children().size();
     73     if (rowCellCount > columnCount)
     74         columnCount = rowCellCount;
     75 
     76     row->setRowIndex((int)m_rows.size());
     77     m_rows.append(row);
     78     m_children.append(row);
     79     appendedRows.add(row);
     80 }
     81 
     82 void AccessibilityARIAGrid::addChildren()
     83 {
     84     ASSERT(!m_haveChildren);
     85 
     86     if (!isDataTable()) {
     87         AccessibilityRenderObject::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<AccessibilityObject*> appendedRows;
     99     unsigned columnCount = 0;
    100     for (RefPtr<AccessibilityObject> child = firstChild(); child; child = child->nextSibling()) {
    101 
    102         // in case the render tree doesn't match the expected ARIA hierarchy, look at the children
    103         if (child->accessibilityIsIgnored()) {
    104             if (!child->hasChildren())
    105                 child->addChildren();
    106 
    107             AccessibilityChildrenVector children = child->children();
    108             unsigned length = children.size();
    109             for (unsigned i = 0; i < length; ++i)
    110                 addChild(children[i].get(), appendedRows, columnCount);
    111         } else
    112             addChild(child.get(), appendedRows, columnCount);
    113     }
    114 
    115     // make the columns based on the number of columns in the first body
    116     for (unsigned i = 0; i < columnCount; ++i) {
    117         AccessibilityTableColumn* column = static_cast<AccessibilityTableColumn*>(axCache->getOrCreate(ColumnRole));
    118         column->setColumnIndex((int)i);
    119         column->setParentTable(this);
    120         m_columns.append(column);
    121         m_children.append(column);
    122     }
    123 
    124     AccessibilityObject* headerContainerObject = headerContainer();
    125     if (headerContainerObject)
    126         m_children.append(headerContainerObject);
    127 }
    128 
    129 AccessibilityTableCell* AccessibilityARIAGrid::cellForColumnAndRow(unsigned column, unsigned row)
    130 {
    131     if (!m_renderer)
    132         return 0;
    133 
    134     if (!hasChildren())
    135         addChildren();
    136 
    137     if (column >= columnCount() || row >= rowCount())
    138         return 0;
    139 
    140     AccessibilityObject* tableRow = m_rows[row].get();
    141     if (!tableRow)
    142         return 0;
    143 
    144     AccessibilityChildrenVector children = tableRow->children();
    145     // in case this row had fewer columns than other rows
    146     AccessibilityObject* tableCell = 0;
    147     if (column >= children.size())
    148         return 0;
    149 
    150     tableCell = children[column].get();
    151     return static_cast<AccessibilityTableCell*>(tableCell);
    152 }
    153 
    154 } // namespace WebCore
    155