void PaintPropertyTreeBuilder::updateScrollTranslation(const LayoutObject& object, PaintPropertyTreeBuilderContext& context)
{
if (!object.isBoxModelObject() || !object.hasOverflowClip())
return;
PaintLayer* layer = toLayoutBoxModelObject(object).layer();
ASSERT(layer);
DoubleSize scrollOffset = layer->getScrollableArea()->scrollOffset();
if (scrollOffset.isZero() && !layer->scrollsOverflow())
return;
RefPtr<TransformPaintPropertyNode> scrollTranslation = TransformPaintPropertyNode::create(
TransformationMatrix().translate(-scrollOffset.width(), -scrollOffset.height()),
FloatPoint3D(),
context.currentTransform);
context.currentTransform = scrollTranslation.get();
object.getMutableForPainting().ensureObjectPaintProperties().setScrollTranslation(scrollTranslation.release());
}
void ScrollAnchor::clear() {
LayoutObject* layoutObject =
m_anchorObject ? m_anchorObject : scrollerLayoutBox(m_scroller);
PaintLayer* layer = nullptr;
if (LayoutObject* parent = layoutObject->parent())
layer = parent->enclosingLayer();
// Walk up the layer tree to clear any scroll anchors.
while (layer) {
if (PaintLayerScrollableArea* scrollableArea = layer->getScrollableArea()) {
ScrollAnchor* anchor = scrollableArea->scrollAnchor();
DCHECK(anchor);
anchor->clearSelf();
}
layer = layer->parent();
}
if (FrameView* view = layoutObject->frameView()) {
ScrollAnchor* anchor = view->scrollAnchor();
DCHECK(anchor);
anchor->clearSelf();
}
}