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;
}