void ScrollingCoordinatorChromium::scrollableAreaScrollLayerDidChange(ScrollableArea* scrollableArea)
{
GraphicsLayerChromium* scrollLayer = static_cast<GraphicsLayerChromium*>(scrollLayerForScrollableArea(scrollableArea));
if (scrollLayer)
scrollLayer->setScrollableArea(scrollableArea);
WebLayer* webLayer = scrollingWebLayerForScrollableArea(scrollableArea);
if (webLayer) {
webLayer->setScrollable(true);
webLayer->setScrollPosition(IntPoint(scrollableArea->scrollPosition() - scrollableArea->minimumScrollPosition()));
webLayer->setMaxScrollPosition(IntSize(scrollableArea->scrollSize(HorizontalScrollbar), scrollableArea->scrollSize(VerticalScrollbar)));
}
if (WebScrollbarLayer* scrollbarLayer = getWebScrollbarLayer(scrollableArea, HorizontalScrollbar))
setupScrollbarLayer(horizontalScrollbarLayerForScrollableArea(scrollableArea), scrollbarLayer, webLayer);
if (WebScrollbarLayer* scrollbarLayer = getWebScrollbarLayer(scrollableArea, VerticalScrollbar))
setupScrollbarLayer(verticalScrollbarLayerForScrollableArea(scrollableArea), scrollbarLayer, webLayer);
}
void NonCompositedContentHost::setViewport(const WebCore::IntSize& viewportSize, const WebCore::IntSize& contentsSize, const WebCore::IntPoint& scrollPosition, const WebCore::IntPoint& scrollOrigin)
{
if (!haveScrollLayer())
return;
bool visibleRectChanged = m_viewportSize != viewportSize;
m_viewportSize = viewportSize;
WebLayer* layer = scrollLayer();
layer->setScrollPosition(scrollPosition + scrollOrigin);
layer->setPosition(WebFloatPoint(-scrollPosition));
// Due to the possibility of pinch zoom, the noncomposited layer is always
// assumed to be scrollable.
layer->setScrollable(true);
m_graphicsLayer->setSize(contentsSize);
// In RTL-style pages, the origin of the initial containing block for the
// root layer may be positive; translate the layer to avoid negative
// coordinates.
m_layerAdjust = -toSize(scrollOrigin);
if (m_graphicsLayer->transform().m41() != m_layerAdjust.width() || m_graphicsLayer->transform().m42() != m_layerAdjust.height()) {
WebCore::TransformationMatrix transform = m_graphicsLayer->transform();
transform.setM41(m_layerAdjust.width());
transform.setM42(m_layerAdjust.height());
m_graphicsLayer->setTransform(transform);
// If a tiled layer is shifted left or right, the content that goes into
// each tile will change. Invalidate the entire layer when this happens.
m_graphicsLayer->setNeedsDisplay();
} else if (visibleRectChanged)
m_graphicsLayer->setNeedsDisplay();
WebCore::GraphicsLayer* clipLayer = m_graphicsLayer->parent()->parent();
WebCore::GraphicsLayer* rootLayer = clipLayer;
while (rootLayer->parent())
rootLayer = rootLayer->parent();
setScrollbarBoundsContainPageScale(rootLayer, clipLayer);
}
