145216 2015-05-20 11:38:48 -0700 Scroll-snap points needs to be updated during programmatic scrolls 2015-06-18 09:59:57 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All All RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=145318 InRadar P2 Normal --- 1 bfulgham bfulgham bfulgham dino simon.fraser webkit-bug-importer oldest_to_newest 1096305 0 bfulgham 2015-05-20 11:38:48 -0700 When content manually scrolls the view (e.g., 'Element.scrollIntoViewIfNeeded()', 'Window.scrollTo'), we need to make sure that we are actively updating our scroll snap state so that we do not try to snap back to a far off snap point once the programmatic scroll completes. 1096439 1 webkit-bug-importer 2015-05-20 18:48:07 -0700 <rdar://problem/21051035> 1096440 2 webkit-bug-importer 2015-05-20 18:48:31 -0700 <rdar://problem/21051039> 1096443 3 253492 bfulgham 2015-05-20 18:59:41 -0700 Created attachment 253492 Patch 1096447 4 253492 bfulgham 2015-05-20 19:06:09 -0700 Comment on attachment 253492 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=253492&action=review > Source/WebCore/platform/ScrollAnimator.cpp:172 > + updateActiveScrollSnapIndexForOffset(); I'm worried this might get hit too frequently, but in my tests it only seems to get called from "notifyPositionChanged" coming from Async scrolling notifications, so I think it's okay. 1096523 5 253492 dino 2015-05-21 01:33:05 -0700 Comment on attachment 253492 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=253492&action=review > Source/WebCore/platform/cocoa/ScrollController.mm:730 > + (void)closestSnapOffset<LayoutUnit, float>(snapState.m_snapOffsets, clampedOffset, 0, activeIndex); For my own information, why do you need to cast here? 1096652 6 253492 bfulgham 2015-05-21 12:26:27 -0700 Comment on attachment 253492 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=253492&action=review >> Source/WebCore/platform/cocoa/ScrollController.mm:730 >> + (void)closestSnapOffset<LayoutUnit, float>(snapState.m_snapOffsets, clampedOffset, 0, activeIndex); > > For my own information, why do you need to cast here? 'closestSnapOffset' returns a LayoutUnit, which I don't care about. So instead of assigning it to a temporary, and saying (void)temporary (or UNUSED_ALWAYS(blah)) I just do the cast here to tell the compiler that I don't care about the return value. 1096653 7 bfulgham 2015-05-21 12:37:57 -0700 Committed r184728: <http://trac.webkit.org/changeset/184728> 253492 2015-05-20 18:59:41 -0700 2015-05-21 01:33:05 -0700 Patch bug-145216-20150520185936.patch text/plain 7862 bfulgham SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE4NDY4OSkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDM0IEBACisyMDE1LTA1LTIwICBCcmVudCBG dWxnaGFtICA8YmZ1bGdoYW1AYXBwbGUuY29tPgorCisgICAgICAgIFNjcm9sbC1zbmFwIHBvaW50 cyBuZWVkcyB0byBiZSB1cGRhdGVkIGR1cmluZyBwcm9ncmFtbWF0aWMgc2Nyb2xscworICAgICAg ICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTQ1MjE2CisKKyAgICAg 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