commit | efb18544facfca748527218c8c742af336929943 | [log] [tgz] |
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author | commit-queue@webkit.org <commit-queue@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> | Tue May 14 16:43:51 2019 +0000 |
committer | commit-queue@webkit.org <commit-queue@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> | Tue May 14 16:43:51 2019 +0000 |
tree | 8c3e7af3d48bd50bb6acd48d8fe857e76ded57a2 | |
parent | 18250043e5b33c59063c2e7ca650898420cbb2f2 [diff] |
[iOS] Cannot scroll to beginning of document after scrolling to end of document and vice versa via key commands https://bugs.webkit.org/show_bug.cgi?id=197848 <rdar://problem/49523065> Patch by Daniel Bates <dabates@apple.com> on 2019-05-14 Reviewed by Brent Fulgham. Source/WebKit: Following the fix for <rdar://problem/49523065>, UIKit no longer emits a keyup event for a Command- modified key. This breaks WebKit's own implementation of key command handling for scrolling to the beginning or end of the document (triggered using Command + Arrow Up and Command + Arrow Down, respectively) because it watches for keyup events to reset state after initiating a scroll. If state is not reset then the scroll key command logic becomes confused and may not perform a subsequent scroll. It seems like we can actually get away with supporting these key commands and future Command modified commands by preemptively reseting state on keydown if the Command modifier is held down. If this does not work out then we can do something more complicated. * UIProcess/ios/WKKeyboardScrollingAnimator.mm: (-[WKKeyboardScrollingAnimator handleKeyEvent:]): LayoutTests: Add a test to ensure that key commands can be used to scroll to the end of the page and then to the beginning of the page. * fast/scrolling/ios/scroll-to-beginning-and-end-of-document-expected.txt: Added. * fast/scrolling/ios/scroll-to-beginning-and-end-of-document.html: Added. * resources/ui-helper.js: (window.UIHelper.callFunctionAndWaitForScrollToFinish): Added. Convenience function that invokes the specified function and returns a Promise that is resolved once the page has finished scrolling. To know if the page has finished scrolling we listen for DOM scroll events and repeatedly reset a 300ms timer. The delay of 300ms was chosen to be > 250ms (to give some margin of error), which is the upper bound delay between scroll event firings, last I recall. When the timer expires we assume that page has finished scrolling. (window.UIHelper): git-svn-id: http://svn.webkit.org/repository/webkit/trunk@245285 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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