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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/AXListBox.h"
     31 
     32 #include "core/accessibility/AXListBoxOption.h"
     33 #include "core/accessibility/AXObjectCache.h"
     34 #include "core/html/HTMLSelectElement.h"
     35 #include "core/rendering/RenderListBox.h"
     36 
     37 
     38 namespace WebCore {
     39 
     40 using namespace HTMLNames;
     41 
     42 AXListBox::AXListBox(RenderObject* renderer)
     43     : AXRenderObject(renderer)
     44 {
     45 }
     46 
     47 AXListBox::~AXListBox()
     48 {
     49 }
     50 
     51 PassRefPtr<AXListBox> AXListBox::create(RenderObject* renderer)
     52 {
     53     return adoptRef(new AXListBox(renderer));
     54 }
     55 
     56 void AXListBox::addChildren()
     57 {
     58     Node* selectNode = m_renderer->node();
     59     if (!selectNode)
     60         return;
     61 
     62     m_haveChildren = true;
     63 
     64     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = toHTMLSelectElement(selectNode)->listItems();
     65     unsigned length = listItems.size();
     66     for (unsigned i = 0; i < length; i++) {
     67         // The cast to HTMLElement below is safe because the only other possible listItem type
     68         // would be a WMLElement, but WML builds don't use accessibility features at all.
     69         AXObject* listOption = listBoxOptionAXObject(listItems[i]);
     70         if (listOption && !listOption->accessibilityIsIgnored())
     71             m_children.append(listOption);
     72     }
     73 }
     74 
     75 AXObject* AXListBox::listBoxOptionAXObject(HTMLElement* element) const
     76 {
     77     // skip hr elements
     78     if (!element || isHTMLHRElement(*element))
     79         return 0;
     80 
     81     AXObject* listBoxObject = m_renderer->document().axObjectCache()->getOrCreate(ListBoxOptionRole);
     82     toAXListBoxOption(listBoxObject)->setHTMLElement(element);
     83 
     84     return listBoxObject;
     85 }
     86 
     87 AXObject* AXListBox::elementAccessibilityHitTest(const IntPoint& point) const
     88 {
     89     // the internal HTMLSelectElement methods for returning a listbox option at a point
     90     // ignore optgroup elements.
     91     if (!m_renderer)
     92         return 0;
     93 
     94     Node* node = m_renderer->node();
     95     if (!node)
     96         return 0;
     97 
     98     LayoutRect parentRect = elementRect();
     99 
    100     AXObject* listBoxOption = 0;
    101     unsigned length = m_children.size();
    102     for (unsigned i = 0; i < length; i++) {
    103         LayoutRect rect = toRenderListBox(m_renderer)->itemBoundingBoxRect(parentRect.location(), i);
    104         // The cast to HTMLElement below is safe because the only other possible listItem type
    105         // would be a WMLElement, but WML builds don't use accessibility features at all.
    106         if (rect.contains(point)) {
    107             listBoxOption = m_children[i].get();
    108             break;
    109         }
    110     }
    111 
    112     if (listBoxOption && !listBoxOption->accessibilityIsIgnored())
    113         return listBoxOption;
    114 
    115     return axObjectCache()->getOrCreate(m_renderer);
    116 }
    117 
    118 } // namespace WebCore
    119