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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 "core/accessibility/AXListBoxOption.h"
     31 
     32 #include "core/accessibility/AXObjectCache.h"
     33 #include "core/html/HTMLOptionElement.h"
     34 #include "core/html/HTMLSelectElement.h"
     35 #include "core/rendering/RenderListBox.h"
     36 
     37 
     38 namespace blink {
     39 
     40 using namespace HTMLNames;
     41 
     42 AXListBoxOption::AXListBoxOption(RenderObject* renderer)
     43     : AXRenderObject(renderer)
     44 {
     45 }
     46 
     47 AXListBoxOption::~AXListBoxOption()
     48 {
     49 }
     50 
     51 PassRefPtr<AXListBoxOption> AXListBoxOption::create(RenderObject* renderer)
     52 {
     53     return adoptRef(new AXListBoxOption(renderer));
     54 }
     55 
     56 bool AXListBoxOption::isEnabled() const
     57 {
     58     if (!node())
     59         return false;
     60 
     61     if (equalIgnoringCase(getAttribute(aria_disabledAttr), "true"))
     62         return false;
     63 
     64     if (toElement(node())->hasAttribute(disabledAttr))
     65         return false;
     66 
     67     return true;
     68 }
     69 
     70 bool AXListBoxOption::isSelected() const
     71 {
     72     return isHTMLOptionElement(node()) && toHTMLOptionElement(node())->selected();
     73 }
     74 
     75 bool AXListBoxOption::isSelectedOptionActive() const
     76 {
     77     HTMLSelectElement* listBoxParentNode = listBoxOptionParentNode();
     78     if (!listBoxParentNode)
     79         return false;
     80 
     81     return listBoxParentNode->activeSelectionEndListIndex() == listBoxOptionIndex();
     82 }
     83 
     84 bool AXListBoxOption::computeAccessibilityIsIgnored() const
     85 {
     86     if (!node())
     87         return true;
     88 
     89     if (accessibilityIsIgnoredByDefault())
     90         return true;
     91 
     92     return false;
     93 }
     94 
     95 bool AXListBoxOption::canSetSelectedAttribute() const
     96 {
     97     if (!isHTMLOptionElement(node()))
     98         return false;
     99 
    100     if (toHTMLOptionElement(node())->isDisabledFormControl())
    101         return false;
    102 
    103     HTMLSelectElement* selectElement = listBoxOptionParentNode();
    104     if (selectElement && selectElement->isDisabledFormControl())
    105         return false;
    106 
    107     return true;
    108 }
    109 
    110 String AXListBoxOption::stringValue() const
    111 {
    112     if (!node())
    113         return String();
    114 
    115     const AtomicString& ariaLabel = getAttribute(aria_labelAttr);
    116     if (!ariaLabel.isNull())
    117         return ariaLabel;
    118 
    119     if (isHTMLOptionElement(node()))
    120         return toHTMLOptionElement(node())->text();
    121 
    122     return String();
    123 }
    124 
    125 void AXListBoxOption::setSelected(bool selected)
    126 {
    127     HTMLSelectElement* selectElement = listBoxOptionParentNode();
    128     if (!selectElement)
    129         return;
    130 
    131     if (!canSetSelectedAttribute())
    132         return;
    133 
    134     bool isOptionSelected = isSelected();
    135     if ((isOptionSelected && selected) || (!isOptionSelected && !selected))
    136         return;
    137 
    138     // Convert from the entire list index to the option index.
    139     int optionIndex = selectElement->listToOptionIndex(listBoxOptionIndex());
    140     selectElement->accessKeySetSelectedIndex(optionIndex);
    141 }
    142 
    143 HTMLSelectElement* AXListBoxOption::listBoxOptionParentNode() const
    144 {
    145     if (!node())
    146         return 0;
    147 
    148     if (isHTMLOptionElement(node()))
    149         return toHTMLOptionElement(node())->ownerSelectElement();
    150 
    151     return 0;
    152 }
    153 
    154 int AXListBoxOption::listBoxOptionIndex() const
    155 {
    156     HTMLSelectElement* selectElement = listBoxOptionParentNode();
    157     if (!selectElement)
    158         return -1;
    159 
    160     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement->listItems();
    161     unsigned length = listItems.size();
    162     for (unsigned i = 0; i < length; i++) {
    163         if (listItems[i] == node())
    164             return i;
    165     }
    166 
    167     return -1;
    168 }
    169 
    170 } // namespace blink
    171