void PinchViewport::setupScrollbar(WebScrollbar::Orientation orientation)
{
bool isHorizontal = orientation == WebScrollbar::Horizontal;
GraphicsLayer* scrollbarGraphicsLayer = isHorizontal ?
m_overlayScrollbarHorizontal.get() : m_overlayScrollbarVertical.get();
OwnPtr<WebScrollbarLayer>& webScrollbarLayer = isHorizontal ?
m_webOverlayScrollbarHorizontal : m_webOverlayScrollbarVertical;
const int overlayScrollbarThickness = m_frameHost.settings().pinchOverlayScrollbarThickness();
if (!webScrollbarLayer) {
ScrollingCoordinator* coordinator = m_frameHost.page().scrollingCoordinator();
ASSERT(coordinator);
ScrollbarOrientation webcoreOrientation = isHorizontal ? HorizontalScrollbar : VerticalScrollbar;
webScrollbarLayer = coordinator->createSolidColorScrollbarLayer(webcoreOrientation, overlayScrollbarThickness, 0, false);
webScrollbarLayer->setClipLayer(m_innerViewportContainerLayer->platformLayer());
scrollbarGraphicsLayer->setContentsToPlatformLayer(webScrollbarLayer->layer());
scrollbarGraphicsLayer->setDrawsContent(false);
}
int xPosition = isHorizontal ? 0 : m_innerViewportContainerLayer->size().width() - overlayScrollbarThickness;
int yPosition = isHorizontal ? m_innerViewportContainerLayer->size().height() - overlayScrollbarThickness : 0;
int width = isHorizontal ? m_innerViewportContainerLayer->size().width() - overlayScrollbarThickness : overlayScrollbarThickness;
int height = isHorizontal ? overlayScrollbarThickness : m_innerViewportContainerLayer->size().height() - overlayScrollbarThickness;
// Use the GraphicsLayer to position the scrollbars.
scrollbarGraphicsLayer->setPosition(IntPoint(xPosition, yPosition));
scrollbarGraphicsLayer->setSize(IntSize(width, height));
scrollbarGraphicsLayer->setContentsRect(IntRect(0, 0, width, height));
}
// Modifies the top of the graphics layer tree to add layers needed to support
// the inner/outer viewport fixed-position model for pinch zoom. When finished,
// the tree will look like this (with * denoting added layers):
//
// *rootTransformLayer
// +- *innerViewportContainerLayer (fixed pos container)
// | +- *overscrollElasticityLayer
// | +- *pageScaleLayer
// | +- *innerViewportScrollLayer
// | +-- overflowControlsHostLayer (root layer)
// | +-- outerViewportContainerLayer (fixed pos container) [frame container layer in PaintLayerCompositor]
// | | +-- outerViewportScrollLayer [frame scroll layer in PaintLayerCompositor]
// | | +-- content layers ...
// +- horizontalScrollbarLayer
// +- verticalScrollbarLayer
// +- scroll corner (non-overlay only)
//
void VisualViewport::attachToLayerTree(GraphicsLayer* currentLayerTreeRoot, GraphicsLayerFactory* graphicsLayerFactory)
{
TRACE_EVENT1("blink", "VisualViewport::attachToLayerTree", "currentLayerTreeRoot", (bool)currentLayerTreeRoot);
if (!currentLayerTreeRoot) {
if (m_innerViewportScrollLayer)
m_innerViewportScrollLayer->removeAllChildren();
return;
}
if (currentLayerTreeRoot->parent() && currentLayerTreeRoot->parent() == m_innerViewportScrollLayer)
return;
if (!m_innerViewportScrollLayer) {
ASSERT(!m_overlayScrollbarHorizontal
&& !m_overlayScrollbarVertical
&& !m_overscrollElasticityLayer
&& !m_pageScaleLayer
&& !m_innerViewportContainerLayer);
// FIXME: The root transform layer should only be created on demand.
m_rootTransformLayer = GraphicsLayer::create(graphicsLayerFactory, this);
m_innerViewportContainerLayer = GraphicsLayer::create(graphicsLayerFactory, this);
m_overscrollElasticityLayer = GraphicsLayer::create(graphicsLayerFactory, this);
m_pageScaleLayer = GraphicsLayer::create(graphicsLayerFactory, this);
m_innerViewportScrollLayer = GraphicsLayer::create(graphicsLayerFactory, this);
m_overlayScrollbarHorizontal = GraphicsLayer::create(graphicsLayerFactory, this);
m_overlayScrollbarVertical = GraphicsLayer::create(graphicsLayerFactory, this);
ScrollingCoordinator* coordinator = frameHost().page().scrollingCoordinator();
ASSERT(coordinator);
coordinator->setLayerIsContainerForFixedPositionLayers(m_innerViewportScrollLayer.get(), true);
// Set masks to bounds so the compositor doesn't clobber a manually
// set inner viewport container layer size.
m_innerViewportContainerLayer->setMasksToBounds(frameHost().settings().mainFrameClipsContent());
m_innerViewportContainerLayer->setSize(m_size);
m_innerViewportScrollLayer->platformLayer()->setScrollClipLayer(
m_innerViewportContainerLayer->platformLayer());
m_innerViewportScrollLayer->platformLayer()->setUserScrollable(true, true);
m_rootTransformLayer->addChild(m_innerViewportContainerLayer.get());
m_innerViewportContainerLayer->addChild(m_overscrollElasticityLayer.get());
m_overscrollElasticityLayer->addChild(m_pageScaleLayer.get());
m_pageScaleLayer->addChild(m_innerViewportScrollLayer.get());
// Ensure this class is set as the scroll layer's ScrollableArea.
coordinator->scrollableAreaScrollLayerDidChange(this);
initializeScrollbars();
}
m_innerViewportScrollLayer->removeAllChildren();
m_innerViewportScrollLayer->addChild(currentLayerTreeRoot);
}
void VisualViewport::setupScrollbar(WebScrollbar::Orientation orientation) {
bool isHorizontal = orientation == WebScrollbar::Horizontal;
GraphicsLayer* scrollbarGraphicsLayer =
isHorizontal ? m_overlayScrollbarHorizontal.get()
: m_overlayScrollbarVertical.get();
std::unique_ptr<WebScrollbarLayer>& webScrollbarLayer =
isHorizontal ? m_webOverlayScrollbarHorizontal
: m_webOverlayScrollbarVertical;
ScrollbarThemeOverlay& theme = ScrollbarThemeOverlay::mobileTheme();
int thumbThickness = theme.thumbThickness();
int scrollbarThickness = theme.scrollbarThickness(RegularScrollbar);
int scrollbarMargin = theme.scrollbarMargin();
if (!webScrollbarLayer) {
ScrollingCoordinator* coordinator =
frameHost().page().scrollingCoordinator();
ASSERT(coordinator);
ScrollbarOrientation webcoreOrientation =
isHorizontal ? HorizontalScrollbar : VerticalScrollbar;
webScrollbarLayer = coordinator->createSolidColorScrollbarLayer(
webcoreOrientation, thumbThickness, scrollbarMargin, false);
// The compositor will control the scrollbar's visibility. Set to invisible
// by default so scrollbars don't show up in layout tests.
webScrollbarLayer->layer()->setOpacity(0);
scrollbarGraphicsLayer->setContentsToPlatformLayer(
webScrollbarLayer->layer());
scrollbarGraphicsLayer->setDrawsContent(false);
}
int xPosition = isHorizontal ? 0
: m_innerViewportContainerLayer->size().width() -
scrollbarThickness;
int yPosition =
isHorizontal
? m_innerViewportContainerLayer->size().height() - scrollbarThickness
: 0;
int width =
isHorizontal
? m_innerViewportContainerLayer->size().width() - scrollbarThickness
: scrollbarThickness;
int height = isHorizontal ? scrollbarThickness
: m_innerViewportContainerLayer->size().height() -
scrollbarThickness;
// Use the GraphicsLayer to position the scrollbars.
scrollbarGraphicsLayer->setPosition(IntPoint(xPosition, yPosition));
scrollbarGraphicsLayer->setSize(FloatSize(width, height));
scrollbarGraphicsLayer->setContentsRect(IntRect(0, 0, width, height));
}
void PinchViewport::setLocation(const FloatPoint& newLocation)
{
FloatPoint clampedOffset(clampOffsetToBoundaries(newLocation));
if (clampedOffset == m_offset)
return;
m_offset = clampedOffset;
ScrollingCoordinator* coordinator = m_frameHost.page().scrollingCoordinator();
ASSERT(coordinator);
coordinator->scrollableAreaScrollLayerDidChange(this);
mainFrame()->loader().saveScrollState();
}
void ScrollingTreeIOS::invalidate()
{
// Invalidate is dispatched by the ScrollingCoordinator class on the ScrollingThread
// to break the reference cycle between ScrollingTree and ScrollingCoordinator when the
// ScrollingCoordinator's page is destroyed.
ASSERT(ScrollingThread::isCurrentThread());
// Since this can potentially be the last reference to the scrolling coordinator,
// we need to release it on the main thread since it has member variables (such as timers)
// that expect to be destroyed from the main thread.
ScrollingCoordinator* scrollingCoordinator = m_scrollingCoordinator.release().leakRef();
callOnMainThread([scrollingCoordinator] {
scrollingCoordinator->deref();
});
}
void EventHandlerRegistry::notifyHasHandlersChanged(EventHandlerClass handlerClass, bool hasActiveHandlers)
{
ScrollingCoordinator* scrollingCoordinator = m_frameHost.page().scrollingCoordinator();
switch (handlerClass) {
case ScrollEvent:
if (scrollingCoordinator)
scrollingCoordinator->updateHaveScrollEventHandlers();
break;
case WheelEvent:
if (scrollingCoordinator)
scrollingCoordinator->updateHaveWheelEventHandlers();
break;
#if ASSERT_ENABLED
case EventsForTesting:
break;
#endif
default:
ASSERT_NOT_REACHED();
break;
}
}
CompositorAnimationTimeline* VisualViewport::compositorAnimationTimeline()
const {
ScrollingCoordinator* c = frameHost().page().scrollingCoordinator();
return c ? c->compositorAnimationTimeline() : nullptr;
}