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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 "core/accessibility/AXSlider.h"
     31 
     32 #include "core/accessibility/AXObjectCache.h"
     33 #include "core/dom/shadow/ShadowRoot.h"
     34 #include "core/html/HTMLInputElement.h"
     35 #include "core/html/shadow/ShadowElementNames.h"
     36 #include "core/rendering/RenderObject.h"
     37 
     38 namespace WebCore {
     39 
     40 using namespace HTMLNames;
     41 
     42 AXSlider::AXSlider(RenderObject* renderer)
     43     : AXRenderObject(renderer)
     44 {
     45 }
     46 
     47 PassRefPtr<AXSlider> AXSlider::create(RenderObject* renderer)
     48 {
     49     return adoptRef(new AXSlider(renderer));
     50 }
     51 
     52 AccessibilityOrientation AXSlider::orientation() const
     53 {
     54     // Default to horizontal in the unknown case.
     55     if (!m_renderer)
     56         return AccessibilityOrientationHorizontal;
     57 
     58     RenderStyle* style = m_renderer->style();
     59     if (!style)
     60         return AccessibilityOrientationHorizontal;
     61 
     62     ControlPart styleAppearance = style->appearance();
     63     switch (styleAppearance) {
     64     case SliderThumbHorizontalPart:
     65     case SliderHorizontalPart:
     66     case MediaSliderPart:
     67     case MediaFullScreenVolumeSliderPart:
     68         return AccessibilityOrientationHorizontal;
     69 
     70     case SliderThumbVerticalPart:
     71     case SliderVerticalPart:
     72     case MediaVolumeSliderPart:
     73         return AccessibilityOrientationVertical;
     74 
     75     default:
     76         return AccessibilityOrientationHorizontal;
     77     }
     78 }
     79 
     80 void AXSlider::addChildren()
     81 {
     82     ASSERT(!m_haveChildren);
     83 
     84     m_haveChildren = true;
     85 
     86     AXObjectCache* cache = m_renderer->document().axObjectCache();
     87 
     88     AXSliderThumb* thumb = static_cast<AXSliderThumb*>(cache->getOrCreate(SliderThumbRole));
     89     thumb->setParent(this);
     90 
     91     // Before actually adding the value indicator to the hierarchy,
     92     // allow the platform to make a final decision about it.
     93     if (thumb->accessibilityIsIgnored())
     94         cache->remove(thumb->axObjectID());
     95     else
     96         m_children.append(thumb);
     97 }
     98 
     99 const AtomicString& AXSlider::getAttribute(const QualifiedName& attribute) const
    100 {
    101     return element()->getAttribute(attribute);
    102 }
    103 
    104 AXObject* AXSlider::elementAccessibilityHitTest(const IntPoint& point) const
    105 {
    106     if (m_children.size()) {
    107         ASSERT(m_children.size() == 1);
    108         if (m_children[0]->elementRect().contains(point))
    109             return m_children[0].get();
    110     }
    111 
    112     return axObjectCache()->getOrCreate(m_renderer);
    113 }
    114 
    115 void AXSlider::setValue(const String& value)
    116 {
    117     HTMLInputElement* input = element();
    118 
    119     if (input->value() == value)
    120         return;
    121 
    122     input->setValue(value);
    123 
    124     // Fire change event manually, as RenderSlider::setValueForPosition does.
    125     input->dispatchFormControlChangeEvent();
    126 }
    127 
    128 HTMLInputElement* AXSlider::element() const
    129 {
    130     return toHTMLInputElement(m_renderer->node());
    131 }
    132 
    133 
    134 AXSliderThumb::AXSliderThumb()
    135 {
    136 }
    137 
    138 PassRefPtr<AXSliderThumb> AXSliderThumb::create()
    139 {
    140     return adoptRef(new AXSliderThumb());
    141 }
    142 
    143 LayoutRect AXSliderThumb::elementRect() const
    144 {
    145     if (!m_parent)
    146         return LayoutRect();
    147 
    148     RenderObject* sliderRenderer = m_parent->renderer();
    149     if (!sliderRenderer || !sliderRenderer->isSlider())
    150         return LayoutRect();
    151     return toElement(sliderRenderer->node())->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderThumb())->boundingBox();
    152 }
    153 
    154 bool AXSliderThumb::computeAccessibilityIsIgnored() const
    155 {
    156     return accessibilityIsIgnoredByDefault();
    157 }
    158 
    159 } // namespace WebCore
    160