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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 "AccessibilityARIAGridRow.h"
     31 
     32 #include "AccessibilityObject.h"
     33 #include "AccessibilityTable.h"
     34 #include "RenderObject.h"
     35 
     36 using namespace std;
     37 
     38 namespace WebCore {
     39 
     40 AccessibilityARIAGridRow::AccessibilityARIAGridRow(RenderObject* renderer)
     41     : AccessibilityTableRow(renderer)
     42 {
     43 }
     44 
     45 AccessibilityARIAGridRow::~AccessibilityARIAGridRow()
     46 {
     47 }
     48 
     49 PassRefPtr<AccessibilityARIAGridRow> AccessibilityARIAGridRow::create(RenderObject* renderer)
     50 {
     51     return adoptRef(new AccessibilityARIAGridRow(renderer));
     52 }
     53 
     54 bool AccessibilityARIAGridRow::isARIATreeGridRow() const
     55 {
     56     AccessibilityObject* parent = parentTable();
     57     if (!parent)
     58         return false;
     59 
     60     return parent->ariaRoleAttribute() == TreeGridRole;
     61 }
     62 
     63 void AccessibilityARIAGridRow::disclosedRows(AccessibilityChildrenVector& disclosedRows)
     64 {
     65     // The contiguous disclosed rows will be the rows in the table that
     66     // have an aria-level of plus 1 from this row.
     67     AccessibilityObject* parent = parentObjectUnignored();
     68     if (!parent || !parent->isAccessibilityTable())
     69         return;
     70 
     71     // Search for rows that match the correct level.
     72     // Only take the subsequent rows from this one that are +1 from this row's level.
     73     int index = rowIndex();
     74     if (index < 0)
     75         return;
     76 
     77     unsigned level = hierarchicalLevel();
     78     AccessibilityChildrenVector& allRows = static_cast<AccessibilityTable*>(parent)->rows();
     79     int rowCount = allRows.size();
     80     for (int k = index + 1; k < rowCount; ++k) {
     81         AccessibilityObject* row = allRows[k].get();
     82         // Stop at the first row that doesn't match the correct level.
     83         if (row->hierarchicalLevel() != level + 1)
     84             break;
     85 
     86         disclosedRows.append(row);
     87     }
     88 }
     89 
     90 AccessibilityObject* AccessibilityARIAGridRow::disclosedByRow() const
     91 {
     92     // The row that discloses this one is the row in the table
     93     // that is aria-level subtract 1 from this row.
     94     AccessibilityObject* parent = parentObjectUnignored();
     95     if (!parent || !parent->isAccessibilityTable())
     96         return 0;
     97 
     98     // If the level is 1 or less, than nothing discloses this row.
     99     unsigned level = hierarchicalLevel();
    100     if (level <= 1)
    101         return 0;
    102 
    103     // Search for the previous row that matches the correct level.
    104     int index = rowIndex();
    105     AccessibilityChildrenVector& allRows = static_cast<AccessibilityTable*>(parent)->rows();
    106     int rowCount = allRows.size();
    107     if (index >= rowCount)
    108         return 0;
    109 
    110     for (int k = index - 1; k >= 0; --k) {
    111         AccessibilityObject* row = allRows[k].get();
    112         if (row->hierarchicalLevel() == level - 1)
    113             return row;
    114     }
    115 
    116     return 0;
    117 }
    118 
    119 AccessibilityObject* AccessibilityARIAGridRow::parentTable() const
    120 {
    121     AccessibilityObject* parent = parentObjectUnignored();
    122     if (!parent->isAccessibilityTable())
    123         return 0;
    124 
    125     return parent;
    126 }
    127 
    128 AccessibilityObject* AccessibilityARIAGridRow::headerObject()
    129 {
    130     AccessibilityChildrenVector rowChildren = children();
    131     unsigned childrenCount = rowChildren.size();
    132     for (unsigned i = 0; i < childrenCount; ++i) {
    133         AccessibilityObject* cell = rowChildren[i].get();
    134         if (cell->ariaRoleAttribute() == RowHeaderRole)
    135             return cell;
    136     }
    137 
    138     return 0;
    139 }
    140 
    141 } // namespace WebCore
    142