Source/modules/accessibility/AXSlider.cpp

/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
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 *     notice, this list of conditions and the following disclaimer in the
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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#include "config.h"
#include "modules/accessibility/AXSlider.h"

#include "core/dom/shadow/ShadowRoot.h"
#include "core/html/HTMLInputElement.h"
#include "core/html/shadow/ShadowElementNames.h"
#include "core/layout/LayoutObject.h"
#include "modules/accessibility/AXObjectCacheImpl.h"

namespace blink {

using namespace HTMLNames;

AXSlider::AXSlider(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
    : AXLayoutObject(layoutObject, axObjectCache)
{
}

AXSlider* AXSlider::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
{
    return new AXSlider(layoutObject, axObjectCache);
}

AccessibilityRole AXSlider::determineAccessibilityRole()
{
    if ((m_ariaRole = determineAriaRoleAttribute()) != UnknownRole)
        return m_ariaRole;

    return SliderRole;
}

AccessibilityOrientation AXSlider::orientation() const
{
    // Default to horizontal in the unknown case.
    if (!m_layoutObject)
        return AccessibilityOrientationHorizontal;

    const ComputedStyle* style = m_layoutObject->style();
    if (!style)
        return AccessibilityOrientationHorizontal;

    ControlPart styleAppearance = style->appearance();
    switch (styleAppearance) {
    case SliderThumbHorizontalPart:
    case SliderHorizontalPart:
    case MediaSliderPart:
    case MediaFullScreenVolumeSliderPart:
        return AccessibilityOrientationHorizontal;

    case SliderThumbVerticalPart:
    case SliderVerticalPart:
    case MediaVolumeSliderPart:
        return AccessibilityOrientationVertical;

    default:
        return AccessibilityOrientationHorizontal;
    }
}

void AXSlider::addChildren()
{
    ASSERT(!m_haveChildren);

    m_haveChildren = true;

    AXObjectCacheImpl& cache = axObjectCache();

    AXSliderThumb* thumb = static_cast<AXSliderThumb*>(cache.getOrCreate(SliderThumbRole));
    thumb->setParent(this);

    // Before actually adding the value indicator to the hierarchy,
    // allow the platform to make a final decision about it.
    if (thumb->accessibilityIsIgnored())
        cache.remove(thumb->axObjectID());
    else
        m_children.append(thumb);
}

const AtomicString& AXSlider::getAttribute(const QualifiedName& attribute) const
{
    return element()->getAttribute(attribute);
}

AXObject* AXSlider::elementAccessibilityHitTest(const IntPoint& point) const
{
    if (m_children.size()) {
        ASSERT(m_children.size() == 1);
        if (m_children[0]->elementRect().contains(point))
            return m_children[0].get();
    }

    return axObjectCache().getOrCreate(m_layoutObject);
}

void AXSlider::setValue(const String& value)
{
    HTMLInputElement* input = element();

    if (input->value() == value)
        return;

    input->setValue(value, DispatchInputAndChangeEvent);

    // Fire change event manually, as LayoutSlider::setValueForPosition does.
    input->dispatchFormControlChangeEvent();
}

HTMLInputElement* AXSlider::element() const
{
    return toHTMLInputElement(m_layoutObject->node());
}

AXSliderThumb::AXSliderThumb(AXObjectCacheImpl& axObjectCache)
    : AXMockObject(axObjectCache)
{
}

AXSliderThumb* AXSliderThumb::create(AXObjectCacheImpl& axObjectCache)
{
    return new AXSliderThumb(axObjectCache);
}

LayoutRect AXSliderThumb::elementRect() const
{
    if (!m_parent)
        return LayoutRect();

    LayoutObject* sliderLayoutObject = m_parent->layoutObject();
    if (!sliderLayoutObject || !sliderLayoutObject->isSlider())
        return LayoutRect();
    return toElement(sliderLayoutObject->node())->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderThumb())->boundingBox();
}

bool AXSliderThumb::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReasons) const
{
    return accessibilityIsIgnoredByDefault(ignoredReasons);
}

} // namespace blink