IntRect RenderScrollbar::buttonRect(ScrollbarPart partType)
{
RenderScrollbarPart* partRenderer = m_parts.get(partType);
if (!partRenderer)
return IntRect();
partRenderer->layout();
bool isHorizontal = orientation() == HorizontalScrollbar;
if (partType == BackButtonStartPart)
return IntRect(x(), y(), isHorizontal ? partRenderer->width() : width(), isHorizontal ? height() : partRenderer->height());
if (partType == ForwardButtonEndPart)
return IntRect(isHorizontal ? x() + width() - partRenderer->width() : x(),
isHorizontal ? y() : y() + height() - partRenderer->height(),
isHorizontal ? partRenderer->width() : width(),
isHorizontal ? height() : partRenderer->height());
if (partType == ForwardButtonStartPart) {
IntRect previousButton = buttonRect(BackButtonStartPart);
return IntRect(isHorizontal ? x() + previousButton.width() : x(),
isHorizontal ? y() : y() + previousButton.height(),
isHorizontal ? partRenderer->width() : width(),
isHorizontal ? height() : partRenderer->height());
}
IntRect followingButton = buttonRect(ForwardButtonEndPart);
return IntRect(isHorizontal ? x() + width() - followingButton.width() - partRenderer->width() : x(),
isHorizontal ? y() : y() + height() - followingButton.height() - partRenderer->height(),
isHorizontal ? partRenderer->width() : width(),
isHorizontal ? height() : partRenderer->height());
}
void RenderScrollbar::updateScrollbarParts(bool destroy)
{
updateScrollbarPart(ScrollbarBGPart, destroy);
updateScrollbarPart(BackButtonStartPart, destroy);
updateScrollbarPart(ForwardButtonStartPart, destroy);
updateScrollbarPart(BackTrackPart, destroy);
updateScrollbarPart(ThumbPart, destroy);
updateScrollbarPart(ForwardTrackPart, destroy);
updateScrollbarPart(BackButtonEndPart, destroy);
updateScrollbarPart(ForwardButtonEndPart, destroy);
updateScrollbarPart(TrackBGPart, destroy);
if (destroy)
return;
// See if the scrollbar's thickness changed. If so, we need to mark our owning object as needing a layout.
bool isHorizontal = orientation() == HorizontalScrollbar;
int oldThickness = isHorizontal ? height() : width();
int newThickness = 0;
RenderScrollbarPart* part = m_parts.get(ScrollbarBGPart);
if (part) {
part->layout();
newThickness = isHorizontal ? part->height() : part->width();
}
if (newThickness != oldThickness) {
setFrameRect(IntRect(x(), y(), isHorizontal ? width() : newThickness, isHorizontal ? newThickness : height()));
owningRenderer()->setChildNeedsLayout(true);
}
}
int RenderScrollbar::minimumThumbLength()
{
RenderScrollbarPart* partRenderer = m_parts.get(ThumbPart);
if (!partRenderer)
return 0;
partRenderer->layout();
return orientation() == HorizontalScrollbar ? partRenderer->width() : partRenderer->height();
}
RenderScrollbar::RenderScrollbar(ScrollbarClient* client, ScrollbarOrientation orientation, RenderBox* renderer, Frame* owningFrame)
: Scrollbar(client, orientation, RegularScrollbar, RenderScrollbarTheme::renderScrollbarTheme())
, m_owner(renderer)
, m_owningFrame(owningFrame)
{
// FIXME: We need to do this because RenderScrollbar::styleChanged is called as soon as the scrollbar is created.
// Update the scrollbar size.
updateScrollbarPart(ScrollbarBGPart);
RenderScrollbarPart* part = m_parts.get(ScrollbarBGPart);
if (!part)
return;
part->layout();
setFrameRect(IntRect(0, 0, part->width(), part->height()));
}