183889 2018-03-21 23:28:49 -0700 [iOS] Make the Find UI better estimate the obscured area when revealing highlighted text 2018-03-28 07:49:05 -0700 1 1 1 Unclassified WebKit Frames WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 183658 1 fred.wang webkit-unassigned mitz oldest_to_newest 1408304 0 fred.wang 2018-03-21 23:28:49 -0700 In bug 183658, I landed a quick workaround to prevent the NBC news header from overlapping highlighted text result. Basically, we now just center the result in the viewport. However, there is probably a better way to estimate the obscured area via adjustScrollStepForFixedContent. 1408305 1 fred.wang 2018-03-21 23:36:40 -0700 Sorry, I had forgotten to set a title. 1409502 2 fred.wang 2018-03-27 04:24:08 -0700 I took a look into this. As I understand the logic of adjustScrollStepForFixedContent is to check if some fixed opaque content covers the full width at the top/bottom of the frame so that vertical page scroll can be adjusted appropriately on macOS. I guess we can re-use this logic but we have couple differences here. First since fixed content is relative to parent subframe, adjusting the page scroll of "overflow: auto" node does not seem to work in general (we would have to scroll the parent subframe to make the overflow node visible). Second, I'm not exactly sure page scroll makes sense on iOS and anyway here it's not page scroll but "scroll to reveal match" which ends up at scrollRectToVisible. Finally, in the AMP use case of bug 183658, the frame area is essentially the same as the "overflow: auto" area so we could apply the same logic but I wonder whether we should rather focus on making frame scrollable on iOS (bug 149264) in order to address these kinds of use case of "scrollable page with fixed-positioned header/footer". 1409841 3 336658 fred.wang 2018-03-28 07:49:05 -0700 Created attachment 336658 Testcase (main frame) This is a testcase with the main frame. As I see: * For Ctrl+F: * On macOS, the text is revealed without scrolling the result away from the "position: fixed" overlay (so similar to iOS before bug 183658). * On iOS, the result is revealed at the center (so consistent with what is now done for overflow node after bug 183658) * For PageUp/PageDown: * On macOS, the header/footer are taken into account in adjustScrollStepForFixedContent to calculate the page step value. * On iOS, it's not clear to me. The scroll is initiated in the UI process while FrameView::adjustScrollStepForFixedContent (or even ScrollArea::scroll) is not called in the Web process. 336658 2018-03-28 07:49:05 -0700 2018-03-28 07:49:05 -0700 Testcase (main frame) bug-183889-main-frame.html text/html 10622 fred.wang PCFET0NUWVBFIGh0bWw+CjxodG1sPgogIDxoZWFkPgogICAgPHRpdGxlPjwvdGl0bGU+CiAgICA8 bWV0YSBuYW1lPSJ2aWV3cG9ydCIgY29udGVudD0id2lkdGg9ZGV2aWNlLXdpZHRoIj4KICAgIDxt ZXRhIGNoYXJzZXQ9InV0Zi04Ii8+CiAgICA8c3R5bGU+CiAgICAgYm9keSB7CiAgICAgICAgbWFy Z2luOiAwOwogICAgIH0KICAgICAvKgogICAgICB0b3AvYm90dG9tIG9ic2N1cmVkIGFyZWFzIHNo b3VsZCBiZSBwb3NpdGlvbjogZml4ZWQsIG9wYWNpdHk6IDEgYW5kIGZ1bCB3aWR0aC4KICAgICAg cGFnZVN0ZXAgaXMgbWF4KGhlaWdodCptaW5GcmFjdGlvblRvU3RlcFdoZW5QYWdpbmcsCiAgICAg ICAgICAgICAgICAgICAgICBjb250ZW50SGVpZ2h0LW1heE92ZXJsYXBCZXR3ZWVuUGFnZSwgMSkK ICAgICAgV2l0aCBjb250ZW50SGVpZ2h0ID09IGhlaWdodCAtICh0b3ArYm90dG9tIG9ic2N1cmVk IGFyZWFzKS4KICAgICAgICAgICBtaW5GcmFjdGlvblRvU3RlcFdoZW5QYWdpbmcgPSA4MCUKICAg 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