210454 2020-04-13 13:36:40 -0700 Implement rAF-aligned Pointer/Mouse/Touch events 2025-02-12 07:46:11 -0800 1 1 1 Unclassified WebKit UI Events WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=264002 BrowserCompat, InRadar P2 Normal --- 1 dino webkit-unassigned 709922234 a_protyasha caleb daxpedda gsnedders juberti karlcow luke maggotfish rniwa simon.fraser webkit-bug-importer oldest_to_newest 1641077 0 dino 2020-04-13 13:36:40 -0700 Implement rAF-aligned UI events. See - https://w3c.github.io/pointerevents/ and wording on coalescing and aligning - https://www.chromestatus.com/feature/6192761317359616 - Firefox also implemented it even though the page above doesn't currently mention that 1641078 1 webkit-bug-importer 2020-04-13 13:37:02 -0700 <rdar://problem/61734836> 1679793 2 rniwa 2020-08-12 13:00:11 -0700 I don't follow this. What is being coalesced and how? 1679804 3 simon.fraser 2020-08-12 13:34:06 -0700 You can coalesce multiple pointermove and pointerrawupdate events in the same event loop: https://w3c.github.io/pointerevents/#dfn-coalesced-event-list 1679806 4 rniwa 2020-08-12 13:37:52 -0700 (In reply to Simon Fraser (smfr) from comment #3) > You can coalesce multiple pointermove and pointerrawupdate events in the > same event loop: > https://w3c.github.io/pointerevents/#dfn-coalesced-event-list But how does this integrate with the event loop? The spec doesn't seem to say anything about how events are coalesced. 1679824 5 simon.fraser 2020-08-12 14:26:47 -0700 https://github.com/w3c/pointerevents/issues/328 1819861 6 gsnedders 2021-12-02 14:07:12 -0800 AIUI, there's no actual definition about how the coalescing happens. The spec has this because at least Android and iOS do this, and it's basically left down to the browser how often to actually fire events. Clearly, the browser can't fire events more often than it gets them from the OS. In the iOS case, see https://developer.apple.com/documentation/uikit/touches_presses_and_gestures/handling_touches_in_your_view/getting_high-fidelity_input_with_coalesced_touches In short: > UIKit usually delivers touches to your app at around 60 Hz, but some devices are capable of recording touch information at up to 240 Hz. 1988419 7 karlcow 2023-10-30 02:14:38 -0700 A section has been added about coalesced events https://w3c.github.io/pointerevents/#coalesced-events aka getCoalescedEvents() 2052780 8 a_protyasha 2024-08-14 10:55:43 -0700 We've landed `PointerEvent.getCoalescedEvents()` in 281520@main, but pointer events are not rAF-aligned still. I'll retitle this bug so we don't conflate the two things.