Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: ce76e2b79384d3b751287f8c8da007d3c7fd9fc4
https://github.com/WebKit/WebKit/commit/ce76e2b79384d3b751287f8c8da007d3c7fd9fc4
Author: Lily Spiniolas <[email protected]>
Date: 2026-07-14 (Tue, 14 Jul 2026)
Changed paths:
M Source/WebCore/PAL/pal/spi/mac/NSScrollViewSPI.h
M Source/WebCore/page/scrolling/ScrollingTree.cpp
M Source/WebCore/page/scrolling/ScrollingTree.h
M Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.cpp
M Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h
M Source/WebCore/page/scrolling/ScrollingTreeScrollingNodeDelegate.h
M Source/WebCore/page/scrolling/ThreadedScrollingTreeScrollingNodeDelegate.h
M Source/WebCore/platform/PlatformWheelEvent.h
M Source/WebCore/platform/ScrollingEffectsController.h
M Source/WebCore/platform/mac/ScrollingEffectsController.mm
M Source/WebKit/Shared/WebEventConversion.cpp
M Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivateForTesting.h
M Source/WebKit/UIProcess/API/Cocoa/WKWebViewTesting.mm
M
Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.cpp
M Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.h
M Tools/TestWebKitAPI/Helpers/cocoa/WebPage+Extras.swift
M Tools/TestWebKitAPI/Tests/WebKit/WebPage/AppKit Gesture
Tests/BasicAppKitGesturesTests.swift
Log Message:
-----------
[macOS] Scroll stretch behavior should more closely match NSScrollView
https://bugs.webkit.org/show_bug.cgi?id=318641
rdar://174548304
Reviewed by Abrar Rahman Protyasha and Richard Robinson.
Update WebKit's scroll stretch behavior to more closely resemble NSScrollView.
In the normal scroll-stretch path, there should be no observable change for
user-driven scrolling. In scroll-stretch path when a refresh control is present,
the scroll deltas are no longer dampened whatsoever until the stretch surpasses
the full activation height of the refresh control.
For automation-driven scrolling, the hyperbolic coefficient used during
rubberband
animations is altered in order to align with AppKit.
Test: Tools/TestWebKitAPI/Tests/WebKit/WebPage/AppKit Gesture
Tests/BasicAppKitGesturesTests.swift
* Source/WebCore/PAL/pal/spi/mac/NSScrollViewSPI.h:
* Source/WebCore/page/scrolling/ScrollingTree.cpp:
(WebCore::ScrollingTree::rubberbandHyperbolicCoefficientForTesting):
* Source/WebCore/page/scrolling/ScrollingTree.h:
* Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.cpp:
(WebCore::ScrollingTreeScrollingNode::rubberbandHyperbolicCoefficientForTesting
const):
* Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h:
* Source/WebCore/page/scrolling/ScrollingTreeScrollingNodeDelegate.h:
(WebCore::ScrollingTreeScrollingNodeDelegate::rubberbandHyperbolicCoefficientForTesting
const):
* Source/WebCore/page/scrolling/ThreadedScrollingTreeScrollingNodeDelegate.h:
* Source/WebCore/platform/PlatformWheelEvent.h:
(WebCore::PlatformWheelEvent::inputSource const):
(WebCore::PlatformWheelEvent::setInputSource):
* Source/WebCore/platform/ScrollingEffectsController.h:
(WebCore::ScrollingEffectsController::rubberbandHyperbolicCoefficientForTesting
const):
* Source/WebCore/platform/mac/ScrollingEffectsController.mm:
(WebCore::hyperbolicReboundDeltaForElasticDelta):
(WebCore::ScrollingEffectsController::handleWheelEvent):
(WebCore::ScrollingEffectsController::deltaAdjustedForRefreshController):
(WebCore::ScrollingEffectsController::computeDampedStretchDelta):
(WebCore::ScrollingEffectsController::applyScrollDeltaWithStretching):
* Source/WebKit/Shared/WebEventConversion.cpp:
(WebKit::WebKit2PlatformWheelEvent::WebKit2PlatformWheelEvent):
* Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivateForTesting.h:
* Source/WebKit/UIProcess/API/Cocoa/WKWebViewTesting.mm:
(-[WKWebView _rubberbandHyperbolicCoefficientForTesting]):
* Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.cpp:
(WebKit::RemoteScrollingCoordinatorProxy::rubberbandHyperbolicCoefficientForTesting
const):
* Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.h:
* Tools/TestWebKitAPI/Helpers/cocoa/WebPage+Extras.swift:
(rubberbandHyperbolicCoefficient):
(scrollWheel(at:delta:)):
* Tools/TestWebKitAPI/Tests/WebKit/WebPage/AppKit Gesture
Tests/BasicAppKitGesturesTests.swift:
(AppKitGesturesTests.scrollInputSourceUpdatesrubberbandHyperbolicCoefficient):
Canonical link: https://commits.webkit.org/317207@main
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