void PaintInvalidationCapableScrollableArea::willRemoveScrollbar(Scrollbar& scrollbar, ScrollbarOrientation orientation)
{
if (!scrollbar.isCustomScrollbar()
&& !(orientation == HorizontalScrollbar ? layerForHorizontalScrollbar() : layerForVerticalScrollbar()))
boxForScrollControlPaintInvalidation().invalidateDisplayItemClient(scrollbar);
ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
}
void FramePainter::paintScrollbar(GraphicsContext& context, Scrollbar& bar, const IntRect& rect)
{
bool needsBackground = bar.isCustomScrollbar() && frameView().frame().isMainFrame();
if (needsBackground) {
IntRect toFill = bar.frameRect();
toFill.intersect(rect);
context.fillRect(toFill, frameView().baseBackgroundColor());
}
bar.paint(context, CullRect(rect));
}
void ScrollingCoordinatorChromium::scrollableAreaScrollbarLayerDidChange(ScrollableArea* scrollableArea, ScrollbarOrientation orientation)
{
#if OS(DARWIN)
static const bool platformSupportsCoordinatedScrollbar = false;
static const bool platformSupportsMainFrameOnly = false; // Don't care.
#elif OS(WINDOWS)
static const bool platformSupportsCoordinatedScrollbar = true;
static const bool platformSupportsMainFrameOnly = true;
#else
static const bool platformSupportsCoordinatedScrollbar = true;
static const bool platformSupportsMainFrameOnly = false;
#endif
if (!platformSupportsCoordinatedScrollbar)
return;
bool isMainFrame = (scrollableArea == static_cast<ScrollableArea*>(m_page->mainFrame()->view()));
if (!isMainFrame && platformSupportsMainFrameOnly)
return;
GraphicsLayer* scrollbarGraphicsLayer = orientation == HorizontalScrollbar ? horizontalScrollbarLayerForScrollableArea(scrollableArea) : verticalScrollbarLayerForScrollableArea(scrollableArea);
if (scrollbarGraphicsLayer) {
Scrollbar* scrollbar = orientation == HorizontalScrollbar ? scrollableArea->horizontalScrollbar() : scrollableArea->verticalScrollbar();
if (scrollbar->isCustomScrollbar()) {
detachScrollbarLayer(scrollbarGraphicsLayer);
return;
}
WebScrollbarLayer* scrollbarLayer = getWebScrollbarLayer(scrollableArea, orientation);
if (!scrollbarLayer)
scrollbarLayer = addWebScrollbarLayer(scrollableArea, orientation, createScrollbarLayer(scrollbar));
// Root layer non-overlay scrollbars should be marked opaque to disable
// blending.
bool isOpaqueScrollbar = !scrollbar->isOverlayScrollbar();
if (!scrollbarGraphicsLayer->contentsOpaque())
scrollbarGraphicsLayer->setContentsOpaque(isMainFrame && isOpaqueScrollbar);
scrollbarLayer->layer()->setOpaque(scrollbarGraphicsLayer->contentsOpaque());
setupScrollbarLayer(scrollbarGraphicsLayer, scrollbarLayer, scrollingWebLayerForScrollableArea(scrollableArea));
} else
removeWebScrollbarLayer(scrollableArea, orientation);
}