clord@igalia.com authored Sep 01, 2020 and Alexander Mikhaylenko committed Oct 07, 2020

Add support for smooth scrolling animation with async scrolling https://bugs.webkit.org/show_bug.cgi?id=210382

Reviewed by Carlos Garcia Campos.

This removes the dependency on ScrollableArea from
ScrollAnimationSmooth, which allows its use as a utility class for
smooth scrolling. This class is then used in the Nicosia async layer
composition scrolling code to provide smooth scrolling, when the
feature is enabled. This mirrors the work done in bug 209230 for
kinetic scrolling.

No new tests, enabling existing functionality in more situations.

* page/scrolling/ScrollingTreeScrollingNode.cpp:
(WebCore::ScrollingTreeScrollingNode::scrollTo):
* page/scrolling/nicosia/ScrollingTreeFrameScrollingNodeNicosia.cpp:
(WebCore::ScrollingTreeFrameScrollingNodeNicosia::ScrollingTreeFrameScrollingNodeNicosia):
(WebCore::ScrollingTreeFrameScrollingNodeNicosia::commitStateAfterChildren):
(WebCore::ScrollingTreeFrameScrollingNodeNicosia::handleWheelEvent):
(WebCore::ScrollingTreeFrameScrollingNodeNicosia::stopScrollAnimations):
* page/scrolling/nicosia/ScrollingTreeFrameScrollingNodeNicosia.h:
* page/scrolling/nicosia/ScrollingTreeOverflowScrollingNodeNicosia.cpp:
(WebCore::ScrollingTreeOverflowScrollingNodeNicosia::ScrollingTreeOverflowScrollingNodeNicosia):
(WebCore::ScrollingTreeOverflowScrollingNodeNicosia::commitStateAfterChildren):
(WebCore::ScrollingTreeOverflowScrollingNodeNicosia::handleWheelEvent):
(WebCore::ScrollingTreeOverflowScrollingNodeNicosia::stopScrollAnimations):
* page/scrolling/nicosia/ScrollingTreeOverflowScrollingNodeNicosia.h:
* platform/ScrollAnimation.h:
(WebCore::ScrollAnimation::serviceAnimation):
* platform/ScrollAnimationKinetic.cpp:
* platform/ScrollAnimationKinetic.h:
* platform/ScrollAnimationSmooth.cpp:
(WebCore::ScrollAnimationSmooth::ScrollAnimationSmooth):
(WebCore::ScrollAnimationSmooth::scroll):
(WebCore::ScrollAnimationSmooth::stop):
(WebCore::ScrollAnimationSmooth::updateVisibleLengths):
(WebCore::ScrollAnimationSmooth::animationTimerFired):
* platform/ScrollAnimationSmooth.h:
* platform/ScrollAnimator.cpp:
(WebCore::ScrollAnimator::ScrollAnimator):
* platform/generic/ScrollAnimatorGeneric.cpp:
(WebCore::ScrollAnimatorGeneric::ScrollAnimatorGeneric):
(WebCore::ScrollAnimatorGeneric::ensureSmoothScrollingAnimation):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@266390 268f45cc-cd09-0410-ab3c-d52691b4dbfc