示例#1
0
bool Scrollbar::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
{
#if HAVE(ACCESSIBILITY)
    if (AXObjectCache::accessibilityEnabled()) {
        if (parent() && parent()->isFrameView()) {
            Document* document = static_cast<FrameView*>(parent())->frame()->document();
            AXObjectCache* cache = document->axObjectCache();
            AccessibilityScrollbar* axObject = static_cast<AccessibilityScrollbar*>(cache->getOrCreate(ScrollBarRole));
            axObject->setScrollbar(this);
            cache->postNotification(axObject, document, AXObjectCache::AXValueChanged, true);
        }
    }
#endif

    // Ignore perpendicular scrolls.
    if ((m_orientation == HorizontalScrollbar) ? (direction == ScrollUp || direction == ScrollDown) : (direction == ScrollLeft || direction == ScrollRight))
        return false;
    float step = 0;
    switch (granularity) {
    case ScrollByLine:     step = m_lineStep;  break;
    case ScrollByPage:     step = m_pageStep;  break;
    case ScrollByDocument: step = m_totalSize; break;
    case ScrollByPixel:    step = m_pixelStep; break;
    }
    if (direction == ScrollUp || direction == ScrollLeft)
        multiplier = -multiplier;
    if (client())
        return client()->scroll(m_orientation, granularity, step, multiplier);

    return setCurrentPos(max(min(m_currentPos + (step * multiplier), static_cast<float>(m_totalSize - m_visibleSize)), 0.0f), NotFromScrollAnimator);
}
AccessibilityScrollbar* AccessibilityScrollView::addChildScrollbar(Scrollbar* scrollbar)
{
    if (!scrollbar)
        return 0;
    
    AccessibilityScrollbar* scrollBarObject = static_cast<AccessibilityScrollbar*>(axObjectCache()->getOrCreate(scrollbar));
    scrollBarObject->setParent(this);
    m_children.append(scrollBarObject);
    return scrollBarObject;
}
AccessibilityScrollbar* AccessibilityScrollView::addChildScrollbar(Scrollbar* scrollbar)
{
    if (!scrollbar)
        return nullptr;
    
    AXObjectCache* cache = axObjectCache();
    if (!cache)
        return nullptr;

    AccessibilityScrollbar* scrollBarObject = toAccessibilityScrollbar(cache->getOrCreate(scrollbar));
    scrollBarObject->setParent(this);
    m_children.append(scrollBarObject);
    return scrollBarObject;
}