void ScrollableAreaPainter::paintOverflowControls(GraphicsContext* context, const IntPoint& paintOffset, const IntRect& damageRect, bool paintingOverlayControls)
{
// Don't do anything if we have no overflow.
if (!m_scrollableArea.box().hasOverflowClip())
return;
IntPoint adjustedPaintOffset = paintOffset;
if (paintingOverlayControls)
adjustedPaintOffset = m_scrollableArea.cachedOverlayScrollbarOffset();
IntRect localDamageRect = damageRect;
localDamageRect.moveBy(-adjustedPaintOffset);
// Overlay scrollbars paint in a second pass through the layer tree so that they will paint
// on top of everything else. If this is the normal painting pass, paintingOverlayControls
// will be false, and we should just tell the root layer that there are overlay scrollbars
// that need to be painted. That will cause the second pass through the layer tree to run,
// and we'll paint the scrollbars then. In the meantime, cache tx and ty so that the
// second pass doesn't need to re-enter the LayoutTree to get it right.
if (m_scrollableArea.hasOverlayScrollbars() && !paintingOverlayControls) {
m_scrollableArea.setCachedOverlayScrollbarOffset(paintOffset);
// It's not necessary to do the second pass if the scrollbars paint into layers.
if ((m_scrollableArea.horizontalScrollbar() && m_scrollableArea.layerForHorizontalScrollbar()) || (m_scrollableArea.verticalScrollbar() && m_scrollableArea.layerForVerticalScrollbar()))
return;
if (!overflowControlsIntersectRect(localDamageRect))
return;
LayoutView* layoutView = m_scrollableArea.box().view();
DeprecatedPaintLayer* paintingRoot = m_scrollableArea.layer()->enclosingLayerWithCompositedDeprecatedPaintLayerMapping(IncludeSelf);
if (!paintingRoot)
paintingRoot = layoutView->layer();
paintingRoot->setContainsDirtyOverlayScrollbars(true);
return;
}
// This check is required to avoid painting custom CSS scrollbars twice.
if (paintingOverlayControls && !m_scrollableArea.hasOverlayScrollbars())
return;
{
if (m_scrollableArea.horizontalScrollbar() && !m_scrollableArea.layerForHorizontalScrollbar()) {
TransformRecorder translateRecorder(*context, *m_scrollableArea.horizontalScrollbar(), AffineTransform::translation(adjustedPaintOffset.x(), adjustedPaintOffset.y()));
m_scrollableArea.horizontalScrollbar()->paint(context, localDamageRect);
}
if (m_scrollableArea.verticalScrollbar() && !m_scrollableArea.layerForVerticalScrollbar()) {
TransformRecorder translateRecorder(*context, *m_scrollableArea.verticalScrollbar(), AffineTransform::translation(adjustedPaintOffset.x(), adjustedPaintOffset.y()));
m_scrollableArea.verticalScrollbar()->paint(context, localDamageRect);
}
}
if (m_scrollableArea.layerForScrollCorner())
return;
// We fill our scroll corner with white if we have a scrollbar that doesn't run all the way up to the
// edge of the box.
paintScrollCorner(context, adjustedPaintOffset, damageRect);
// Paint our resizer last, since it sits on top of the scroll corner.
paintResizer(context, adjustedPaintOffset, damageRect);
}
