Source/WebCore/accessibility/AccessibilityScrollbar.cpp

/*
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 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *     notice, this list of conditions and the following disclaimer.
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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
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#include "config.h"
#include "AccessibilityScrollbar.h"

#include "AXObjectCache.h"
#include "FrameView.h"
#include "ScrollView.h"
#include "Scrollbar.h"

namespace WebCore {

AccessibilityScrollbar::AccessibilityScrollbar(Scrollbar* scrollbar)
    : m_scrollbar(scrollbar)
{
    ASSERT(scrollbar);
}

Ref<AccessibilityScrollbar> AccessibilityScrollbar::create(Scrollbar* scrollbar)
{
    return adoptRef(*new AccessibilityScrollbar(scrollbar));
}
    
LayoutRect AccessibilityScrollbar::elementRect() const
{
    if (!m_scrollbar)
        return LayoutRect();
    
    return m_scrollbar->frameRect();
}
    
Document* AccessibilityScrollbar::document() const
{
    AccessibilityObject* parent = parentObject();
    if (!parent)
        return nullptr;
    return parent->document();
}

AccessibilityOrientation AccessibilityScrollbar::orientation() const
{
    // ARIA 1.1 Elements with the role scrollbar have an implicit aria-orientation value of vertical.
    if (!m_scrollbar)
        return AccessibilityOrientation::Vertical;

    if (m_scrollbar->orientation() == HorizontalScrollbar)
        return AccessibilityOrientation::Horizontal;
    if (m_scrollbar->orientation() == VerticalScrollbar)
        return AccessibilityOrientation::Vertical;

    return AccessibilityOrientation::Vertical;
}

bool AccessibilityScrollbar::isEnabled() const
{
    if (!m_scrollbar)
        return false;
    return m_scrollbar->enabled();
}
    
float AccessibilityScrollbar::valueForRange() const
{
    if (!m_scrollbar)
        return 0;

    return m_scrollbar->currentPos() / m_scrollbar->maximum();
}

void AccessibilityScrollbar::setValue(float value)
{
    if (!m_scrollbar)
        return;
    
    float newValue = value * m_scrollbar->maximum();
    m_scrollbar->scrollableArea().scrollToOffsetWithoutAnimation(m_scrollbar->orientation(), newValue);
}
    
} // namespace WebCore