Implement visual-viewport based position:fixed handling for Mac async scrolling
https://bugs.webkit.org/show_bug.cgi?id=164495
Reviewed by Tim Horton.
Source/WebCore:
Educate the scrolling tree about visual and layout viewports. This is runtime-switchable,
so we push the enable flag to via the root state node, then push the layout viewport,
and the min/max scroll position that contstrain it, through frame state nodes.
When a scroll happens, we compute a new layout viewport when the visual viewport hits
an edge, and push that down through setScrollLayerPosition() since it's used to position
fixed and sticky layers.
When the main thread gets notified about an async scroll, we set the new layout viewport
on the FrameView, but do so in such a way that does not trigger layout. This is OK because
we do a RenderLayer update which udpates all the layoutViewport-dependent state, and is
necessary to avoid repaints every main thread update.
The iOS code is made to compile, but not work yet.
Tests: compositing/tiling/visiblerect-accumulated-offset.html
fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-then-up.html
fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down.html
fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolling-layers-state.html
* page/FrameView.cpp:
(WebCore::FrameView::setLayoutViewportOrigin):
(WebCore::FrameView::updateLayoutViewport):
(WebCore::FrameView::visualViewportRect):
(WebCore::FrameView::unscaledMinimumScrollPosition):
(WebCore::FrameView::scrollPositionChanged):
* page/FrameView.h:
* page/scrolling/AsyncScrollingCoordinator.cpp:
(WebCore::AsyncScrollingCoordinator::frameViewLayoutUpdated):
(WebCore::AsyncScrollingCoordinator::requestScrollPositionUpdate):
(WebCore::AsyncScrollingCoordinator::scheduleUpdateScrollPositionAfterAsyncScroll):
(WebCore::AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScrollTimerFired):
(WebCore::AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll):
(WebCore::AsyncScrollingCoordinator::visualViewportEnabled):
* page/scrolling/AsyncScrollingCoordinator.h:
(WebCore::AsyncScrollingCoordinator::ScheduledScrollUpdate::ScheduledScrollUpdate):
* page/scrolling/ScrollingStateFrameScrollingNode.cpp:
(WebCore::ScrollingStateFrameScrollingNode::ScrollingStateFrameScrollingNode):
(WebCore::ScrollingStateFrameScrollingNode::setLayoutViewport):
(WebCore::ScrollingStateFrameScrollingNode::setMinLayoutViewportOrigin):
(WebCore::ScrollingStateFrameScrollingNode::setMaxLayoutViewportOrigin):
(WebCore::ScrollingStateFrameScrollingNode::setVisualViewportEnabled):
(WebCore::ScrollingStateFrameScrollingNode::dumpProperties):
* page/scrolling/ScrollingStateFrameScrollingNode.h:
* page/scrolling/ScrollingTree.cpp:
(WebCore::ScrollingTree::viewportChangedViaDelegatedScrolling):
(WebCore::ScrollingTree::scrollPositionChangedViaDelegatedScrolling):
(WebCore::ScrollingTree::commitTreeState):
* page/scrolling/ScrollingTree.h:
(WebCore::ScrollingTree::visualViewportEnabled):
(WebCore::ScrollingTree::setVisualViewportEnabled):
* page/scrolling/ScrollingTreeFrameScrollingNode.cpp:
(WebCore::ScrollingTreeFrameScrollingNode::commitStateBeforeChildren):
(WebCore::ScrollingTreeFrameScrollingNode::layoutViewportForScrollPosition):
* page/scrolling/ScrollingTreeFrameScrollingNode.h:
(WebCore::ScrollingTreeFrameScrollingNode::layoutViewport):
(WebCore::ScrollingTreeFrameScrollingNode::minLayoutViewportOrigin):
(WebCore::ScrollingTreeFrameScrollingNode::maxLayoutViewportOrigin):
* page/scrolling/ScrollingTreeScrollingNode.cpp:
(WebCore::ScrollingTreeScrollingNode::setScrollPositionWithoutContentEdgeConstraints):
* page/scrolling/ScrollingTreeScrollingNode.h:
* page/scrolling/ThreadedScrollingTree.cpp:
(WebCore::ThreadedScrollingTree::scrollingTreeNodeDidScroll):
* page/scrolling/ThreadedScrollingTree.h:
* page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h:
* page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm:
(WebCore::ScrollingTreeFrameScrollingNodeIOS::setScrollPositionWithoutContentEdgeConstraints):
(WebCore::ScrollingTreeFrameScrollingNodeIOS::setScrollLayerPosition):
* page/scrolling/ios/ScrollingTreeIOS.cpp:
(WebCore::ScrollingTreeIOS::scrollingTreeNodeDidScroll):
* page/scrolling/ios/ScrollingTreeIOS.h:
* page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h:
* page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm:
(WebCore::ScrollingTreeFrameScrollingNodeMac::setScrollPositionWithoutContentEdgeConstraints):
(WebCore::ScrollingTreeFrameScrollingNodeMac::setScrollLayerPosition):
Source/WebKit2:
Educate the scrolling tree about visual and layout viewports. This is runtime-switchable,
so we push the enable flag to via the root state node, then push the layout viewport,
and the min/max scroll position that contstrain it, through frame state nodes.
When a scroll happens, we compute a new layout viewport when the visual viewport hits
an edge, and push that down through setScrollLayerPosition() since it's used to position
fixed and sticky layers.
The iOS code is made to compile, but not work yet.
* Shared/Scrolling/RemoteScrollingCoordinatorTransaction.cpp:
(ArgumentCoder<ScrollingStateFrameScrollingNode>::encode):
(ArgumentCoder<ScrollingStateFrameScrollingNode>::decode):
* UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp:
(WebKit::RemoteScrollingCoordinatorProxy::scrollingTreeNodeDidScroll):
* UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h:
* UIProcess/Scrolling/RemoteScrollingTree.cpp:
(WebKit::RemoteScrollingTree::scrollingTreeNodeDidScroll):
* UIProcess/Scrolling/RemoteScrollingTree.h:
* UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h:
* UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.mm:
(WebKit::ScrollingTreeOverflowScrollingNodeIOS::setScrollLayerPosition):
* WebProcess/Scrolling/RemoteScrollingCoordinator.mm:
(WebKit::RemoteScrollingCoordinator::scrollPositionChangedForNode):
LayoutTests:
Tests that dump the scrolling state tree, and the layer tree.
* TestExpectations:
* compositing/tiling/visiblerect-accumulated-offset.html: Added.
* fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-expected.txt: Added.
* fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-then-up-expected.txt: Added.
* fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-then-up.html: Added.
* fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down.html: Added.
* fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolling-layers-state-expected.txt: Added.
* fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolling-layers-state.html: Added.
* platform/mac-wk2/TestExpectations:
* platform/mac/compositing/tiling/visiblerect-accumulated-offset-expected.txt: Added.
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@208503 268f45cc-cd09-0410-ab3c-d52691b4dbfc
41 files changed
