[webkit-changes] [WebKit/WebKit] 390d43: [UI-side compositing] Give RemoteLayerTreeEventDis...

[Simon Fraser]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 390d437355c65ff2d7e02444aed8fd3328e73843
      https://github.com/WebKit/WebKit/commit/390d437355c65ff2d7e02444aed8fd3328e73843
  Author: Simon Fraser <simon.fraser at apple.com>
  Date:   2023-02-26 (Sun, 26 Feb 2023)

  Changed paths:
    M Source/WebCore/page/scrolling/ScrollingTree.h
    M Source/WebKit/UIProcess/RemoteLayerTree/mac/RemoteLayerTreeEventDispatcher.cpp
    M Source/WebKit/UIProcess/RemoteLayerTree/mac/RemoteLayerTreeEventDispatcher.h

  Log Message:
  -----------
  [UI-side compositing] Give RemoteLayerTreeEventDispatcher a HysteresisActivity
https://bugs.webkit.org/show_bug.cgi?id=252950
rdar://105935338

Reviewed by Alan Baradlay.

Use HysteresisActivity to keep the display link alive for 500ms after the last wheel event, to avoid
repeated stops/starts of the display link. This is similar to what we have in WebPageProxy.

* Source/WebCore/page/scrolling/ScrollingTree.h:
* Source/WebKit/UIProcess/RemoteLayerTree/mac/RemoteLayerTreeEventDispatcher.cpp:
(WebKit::m_wheelEventActivityHysteresis):
(WebKit::RemoteLayerTreeEventDispatcher::wheelEventHysteresisUpdated):
(WebKit::RemoteLayerTreeEventDispatcher::willHandleWheelEvent):
(WebKit::RemoteLayerTreeEventDispatcher::startOrStopDisplayLink):
(WebKit::m_displayLinkClient): Deleted.
* Source/WebKit/UIProcess/RemoteLayerTree/mac/RemoteLayerTreeEventDispatcher.h:

Canonical link: https://commits.webkit.org/260854@main