142351 2015-03-05 11:34:50 -0800 [Mac] 'Gliding' phase of scroll snap points is incorrect on desktop 2015-03-05 21:18:15 -0800 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Mac All RESOLVED FIXED InRadar P2 Normal --- 1 bfulgham bfulgham bfulgham webkit-bug-importer oldest_to_newest 1074600 0 bfulgham 2015-03-05 11:34:50 -0800 When working with scroll snap points, I frequently encounter a problem where a momentum gesture does not smoothly animate to the expected snap point. Instead, the momentum animation follows its normal animation curve, ending somewhat short of the desired scroll point. At that point, the snap point animation picks up and slides the element to the correct snap point. This is incorrect. The momentum gesture should be calculating its path based on the snap point. 1074601 1 webkit-bug-importer 2015-03-05 11:35:28 -0800 <rdar://problem/20058023> 1074641 2 bfulgham 2015-03-05 12:45:18 -0800 The problem was caused by an incorrect command to start a new snapping animation timer when the end momentum phase event had been received. This caused WebKit to recalculate the animation curve for the remaining distance, resulting in the bad animation behavior. Removing the start animation command when entering the momentum ended state causes the animation to play out properly. 1074644 3 247983 bfulgham 2015-03-05 12:47:34 -0800 Created attachment 247983 Patch 1074832 4 bfulgham 2015-03-05 21:18:15 -0800 Committed r181137: <http://trac.webkit.org/changeset/181137> 247983 2015-03-05 12:47:34 -0800 2015-03-05 12:48:38 -0800 Patch bug-142351-20150305124714.patch text/plain 1820 bfulgham SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE4MTA5NCkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDIyIEBACisyMDE1LTAzLTA1ICBCcmVudCBG dWxnaGFtICA8YmZ1bGdoYW1AYXBwbGUuY29tPgorCisgICAgICAgIFtNYWNdICdHbGlkaW5nJyBw aGFzZSBvZiBzY3JvbGwgc25hcCBwb2ludHMgaXMgaW5jb3JyZWN0IG9uIGRlc2t0b3AKKyAgICAg ICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE0MjM1MQorICAgICAg ICA8cmRhcjovL3Byb2JsZW0vMjAwNTgwMjM+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZ IChPT1BTISkuCisKKyAgICAgICAgVGhpcyBwcm9ibGVtIHdhcyBjYXVzZWQgYnkgaW5jb3JyZWN0 bHkgc3RhcnRpbmcgYSBuZXcgc25hcHBpbmcgYW5pbWF0aW9uIHRpbWVyIHdoZW4gdGhlCisgICAg ICAgICJlbmQgbW9tZW50dW0iIHBoYXNlIGV2ZW50IGhhZCBiZWVuIHJlY2VpdmVkLiBUaGlzIGNh dXNlZCBXZWJLaXQgdG8gcmVjYWxjdWxhdGUgdGhlCisgICAgICAgIGFuaW1hdGlvbiBjdXJ2ZSBm b3IgdGhlIHJlbWFpbmluZyBkaXN0YW5jZSwgcmVzdWx0aW5nIGluIHRoZSBiYWQgYW5pbWF0aW9u IGJlaGF2aW9yLgorCisgICAgICAgIFJlbW92aW5nIHRoaXMgaW5jb3JyZWN0IHN0YXJ0IGFuaW1h dGlvbiBjb21tYW5kIHdoZW4gZW50ZXJpbmcgdGhlIG1vbWVudHVtIGVuZGVkIHN0YXRlCisgICAg ICAgIHJlc29sdmVzIHRoZSBwcm9ibGVtLgorCisgICAgICAgICogcGxhdGZvcm0vY29jb2EvU2Ny b2xsQ29udHJvbGxlci5tbToKKyAgICAgICAgKFdlYkNvcmU6OlNjcm9sbENvbnRyb2xsZXI6OnBy b2Nlc3NXaGVlbEV2ZW50Rm9yU2Nyb2xsU25hcE9uQXhpcyk6IFJlbW92ZSB0aGUgY29tbWFuZCB0 bworICAgICAgICBzdGFydCBhIG5ldyBzbmFwIGFuaW1hdGlvbiB3aGVuIGVudGVyaW5nIHRoZSAi ZW5kIG1vbWVudHVtIiBzdGF0ZS4KKwogMjAxNS0wMy0wNSAgRGF2aWQgSHlhdHQgIDxoeWF0dEBh cHBsZS5jb20+CiAKICAgICAgICAgQ2FwcyBsb2NrIGluZGljYXRvciBpbiB0ZXh0IGZpZWxkcyBp cyBsYXlpbmcgb3V0IGluIHRoZSB3cm9uZyBwbGFjZS4KSW5kZXg6IFNvdXJjZS9XZWJDb3JlL3Bs YXRmb3JtL2NvY29hL1Njcm9sbENvbnRyb2xsZXIubW0KPT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291cmNlL1dl YkNvcmUvcGxhdGZvcm0vY29jb2EvU2Nyb2xsQ29udHJvbGxlci5tbQkocmV2aXNpb24gMTgxMDk0 KQorKysgU291cmNlL1dlYkNvcmUvcGxhdGZvcm0vY29jb2EvU2Nyb2xsQ29udHJvbGxlci5tbQko d29ya2luZyBjb3B5KQpAQCAtNTM3LDcgKzUzNyw2IEBAIHZvaWQgU2Nyb2xsQ29udHJvbGxlcjo6 cHJvY2Vzc1doZWVsRXZlbnQKICAgICAgICAgYnJlYWs7CiAgICAgICAgIAogICAgIGNhc2UgV2hl ZWxFdmVudFN0YXR1czo6SW5lcnRpYWxTY3JvbGxFbmQ6Ci0gICAgICAgIGJlZ2luU2Nyb2xsU25h cEFuaW1hdGlvbihheGlzLCBTY3JvbGxTbmFwU3RhdGU6OlNuYXBwaW5nKTsKICAgICAgICAgc25h cFN0YXRlLmNsZWFySW5pdGlhbFdoZWVsRGVsdGFXaW5kb3coKTsKICAgICAgICAgc25hcFN0YXRl Lm1fc2hvdWxkT3ZlcnJpZGVXaGVlbEV2ZW50ID0gZmFsc2U7CiAgICAgICAgIGJyZWFrOwo=