141298 2015-02-05 11:22:46 -0800 Scroll Snap Points animation sometimes fights user scroll gesture 2015-03-04 10:53:57 -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 1067150 0 246115 bfulgham 2015-02-05 11:22:46 -0800 Created attachment 246115 Snap Point Example Using the attached test document, I sometimes find WebKit fighting with my scroll motion if a snap point animation starts, and I then attempt to start a manual scroll. It seems like the animation is not being turned off when new user input is encountered. 1067162 1 bfulgham 2015-02-05 11:59:50 -0800 Manual Test: 1. Load the attached snap point example. 2. Partially scroll a view, so that the snap scroll kicks in and WebKit tries to slide the view back to the specified snap point. 3. While the snap point animation is running, begin a new scroll gesture to scroll the view. Result: Currently, you get jittering as the snap animation fights with the scrolling gesture. 1067163 2 webkit-bug-importer 2015-02-05 12:00:35 -0800 <rdar://problem/19733626> 1074124 3 bfulgham 2015-03-04 10:53:57 -0800 This problem was corrected during other snap-point work. The underlying problem was that certain wheel event states were not properly handled by the scroll snap animator logic. This caused the snap animation to continue to run even when the user began certain kinds of wheel gestures. This is now resolved. 246115 2015-02-05 11:22:46 -0800 2015-02-05 11:22:46 -0800 Snap Point Example scroll-snap-mandatory.html text/html 2725 bfulgham PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9JRVRGLy9EVEQgSFRNTC8vRU4iPgo8aHRtbD4KICAg IDxoZWFkPgogICAgICAgIDxzdHlsZT4KICAgICAgICAgICAgLmhvcml6b250YWxHYWxsZXJ5IHsK ICAgICAgICAgICAgICAgIHdpZHRoOiA1MDBweDsKICAgICAgICAgICAgICAgIGhlaWdodDogNTAw cHg7CiAgICAgICAgICAgICAgICBvdmVyZmxvdy15OiBoaWRkZW47CiAgICAgICAgICAgICAgICBv dmVyZmxvdy14OiBhdXRvOwogICAgICAgICAgICAgICAgLXdlYmtpdC1zY3JvbGwtc25hcC1wb2lu dHMteDogcmVwZWF0KDEwMCUpOwogICAgICAgICAgICAgICAgLXdlYmtpdC1zY3JvbGwtc25hcC10 eXBlOiBtYW5kYXRvcnk7CiAgICAgICAgICAgIH0KICAgICAgICAgICAgLmhvcml6b250YWxHYWxs ZXJ5RHJhd2VyIHsKICAgICAgICAgICAgICAgIHdpZHRoOiAzMDAwcHg7CiAgICAgICAgICAgICAg ICBoZWlnaHQ6IDUwMHB4OwogICAgICAgICAgICB9CiAgICAgICAgICAgIC52ZXJ0aWNhbEdhbGxl cnkgewogICAgICAgICAgICAgICAgd2lkdGg6IDUwMHB4OwogICAgICAgICAgICAgICAgaGVpZ2h0 OiA1MDBweDsKICAgICAgICAgICAgICAgIGRpc3BsYXk6IGlubGluZS1ibG9jazsKICAgICAgICAg ICAgICAgIG92ZXJmbG93LXg6IGhpZGRlbjsKICAgICAgICAgICAgICAgIG92ZXJmbG93LXk6IGF1 dG87CiAgICAgICAgICAgICAgICAtd2Via2l0LXNjcm9sbC1zbmFwLXBvaW50cy15OiByZXBlYXQo MTAwJSk7CiAgICAgICAgICAgICAgICAtd2Via2l0LXNjcm9sbC1zbmFwLXR5cGU6IG1hbmRhdG9y eTsKICAgICAgICAgICAgfQogICAgICAgICAgICAudmVydGljYWxHYWxsZXJ5RHJhd2VyIHsKICAg ICAgICAgICAgICAgIHdpZHRoOiA1MDBweDsKICAgICAgICAgICAgICAgIGhlaWdodDogMzAwMHB4 OwogICAgICAgICAgICB9CiAgICAgICAgICAgIC5jb2xvckJveCB7CiAgICAgICAgICAgICAgICBo ZWlnaHQ6IDUwMHB4OwogICAgICAgICAgICAgICAgd2lkdGg6IDUwMHB4OwogICAgICAgICAgICAg ICAgZmxvYXQ6IGxlZnQ7CiAgICAgICAgICAgICAgICAvKi13ZWJraXQtc2Nyb2xsLXNuYXAtY29v cmRpbmF0ZTogNTAlIDUwJTsqLwogICAgICAgICAgICB9CiAgICAgICAgICAgICNpdGVtMCB7CiAg ICAgICAgICAgICAgICBiYWNrZ3JvdW5kLWNvbG9yOiAjRkYwMDAwOwogICAgICAgICAgICB9CiAg ICAgICAgICAgICNpdGVtMSB7CiAgICAgICAgICAgICAgICBiYWNrZ3JvdW5kLWNvbG9yOiAjMDBG RjAwOwogICAgICAgICAgICB9CiAgICAgICAgICAgICNpdGVtMiB7CiAgICAgICAgICAgICAgICBi YWNrZ3JvdW5kLWNvbG9yOiAjMDAwMEZGOwogICAgICAgICAgICB9CiAgICAgICAgICAgICNpdGVt MyB7CiAgICAgICAgICAgICAgICBiYWNrZ3JvdW5kLWNvbG9yOiAjMDBGRkZGOwogICAgICAgICAg ICB9CiAgICAgICAgICAgICNpdGVtNCB7CiAgICAgICAgICAgICAgICBiYWNrZ3JvdW5kLWNvbG9y OiAjRkZGRjAwOwogICAgICAgICAgICB9CiAgICAgICAgICAgICNpdGVtNSB7CiAgICAgICAgICAg ICAgICBiYWNrZ3JvdW5kLWNvbG9yOiAjRkYwMEZGOwogICAgICAgICAgICB9CiAgICAgICAgPC9z dHlsZT4KICAgIDwvaGVhZD4KICAgIDxib2R5PgogICAgICAgIDxkaXYgc3R5bGU9InBvc2l0aW9u OiByZWxhdGl2ZTsgaGVpZ2h0OiA1MDBweDsgd2lkdGg6IDUwMHB4Ij4KICAgICAgICAgICAgPGRp diBjbGFzcz0iaG9yaXpvbnRhbEdhbGxlcnkiPgogICAgICAgICAgICAgICAgPGRpdiBjbGFzcz0i aG9yaXpvbnRhbEdhbGxlcnlEcmF3ZXIiPgogICAgICAgICAgICAgICAgICAgIDxkaXYgaWQ9Iml0 ZW0wIiBjbGFzcz0iY29sb3JCb3giPjwvZGl2PgogICAgICAgICAgICAgICAgICAgIDxkaXYgaWQ9 Iml0ZW0xIiBjbGFzcz0iY29sb3JCb3giPjwvZGl2PgogICAgICAgICAgICAgICAgICAgIDxkaXYg aWQ9Iml0ZW0yIiBjbGFzcz0iY29sb3JCb3giPjwvZGl2PgogICAgICAgICAgICAgICAgICAgIDxk aXYgaWQ9Iml0ZW0zIiBjbGFzcz0iY29sb3JCb3giPjwvZGl2PgogICAgICAgICAgICAgICAgICAg IDxkaXYgaWQ9Iml0ZW00IiBjbGFzcz0iY29sb3JCb3giPjwvZGl2PgogICAgICAgICAgICAgICAg ICAgIDxkaXYgaWQ9Iml0ZW01IiBjbGFzcz0iY29sb3JCb3giPjwvZGl2PgogICAgICAgICAgICAg ICAgPC9kaXY+CiAgICAgICAgICAgIDwvZGl2PgogICAgICAgICAgICA8ZGl2IGNsYXNzPSJ2ZXJ0 aWNhbEdhbGxlcnkiPgogICAgICAgICAgICAgICAgPGRpdiBjbGFzcz0idmVydGljYWxHYWxsZXJ5 RHJhd2VyIj4KICAgICAgICAgICAgICAgICAgICA8ZGl2IGlkPSJpdGVtMCIgY2xhc3M9ImNvbG9y Qm94Ij48L2Rpdj4KICAgICAgICAgICAgICAgICAgICA8ZGl2IGlkPSJpdGVtMSIgY2xhc3M9ImNv bG9yQm94Ij48L2Rpdj4KICAgICAgICAgICAgICAgICAgICA8ZGl2IGlkPSJpdGVtMiIgY2xhc3M9 ImNvbG9yQm94Ij48L2Rpdj4KICAgICAgICAgICAgICAgICAgICA8ZGl2IGlkPSJpdGVtMyIgY2xh c3M9ImNvbG9yQm94Ij48L2Rpdj4KICAgICAgICAgICAgICAgICAgICA8ZGl2IGlkPSJpdGVtNCIg Y2xhc3M9ImNvbG9yQm94Ij48L2Rpdj4KICAgICAgICAgICAgICAgICAgICA8ZGl2IGlkPSJpdGVt NSIgY2xhc3M9ImNvbG9yQm94Ij48L2Rpdj4KICAgICAgICAgICAgICAgIDwvZGl2PgogICAgICAg ICAgICA8L2Rpdj4KICAgICAgICA8L2Rpdj4KICAgIDwvYm9keT4KPC9odG1sPg==