Hi Shawn, On 12/2/20 7:42 AM, Shawn Rutledge wrote: > >> On 2 Dec 2020, at 00:38, Povilas Kanapickas <[email protected] >> <mailto:[email protected]>> wrote: >> >> Hello, >> >> I would like to implement support for Wayland touchpad gestures[1] to >> Qt. Would you potentially accept such a contribution from an outside >> developer if the CLAs are signed and other legal conditions are accepted? >> >> Wayland currently provides swipe and pinch touchpad gestures which could >> be represented by QPinchGesture and QSwipeGesture classes. It seems that >> the gesture events could be handled just like they are handled on macOS, >> but this needs a proof of concept to make sure the assumption holds. > > Yes that sounds right to me. Even more urgent I think is to get > QWheelEvents with pixel deltas and scroll phases, like we have on macOS, > when you are using the flick gesture (two-finger-flick, maybe edge flick > if it’s configurable).
That's nice to hear. I agree that it makes sense to work on QWheelEvents working first. >> If you agree that it makes sense for me to work on this feature, I will >> come back with a more concrete proposal later. >> >> Previously I've implemented touchpad gesture support in X11 and the X11 >> backend of Gtk so I know a little bit about this area. The code is >> currently under review and once it's merged to X11 I'll come back with a >> proposal for this part of Qt too. > > I will work with you on this. > > There was another patch someone started to add this for libinput, but > then gave up for some reason, so I was thinking of getting back to it > myself eventually: > > https://codereview.qt-project.org/c/qt/qtbase/+/293172 If I remember correctly on Linux desktop systems one needs additional permissions to get access to the libinput events directly. I assume this libinput backend is used in various embedded systems and the like, is that right? I think I could finish this PR once the Wayland part is done. I've done pretty much the same thing in the libinput input driver for Xorg [1]. > Maybe we could support trackpad gestures on X11 too? Yes, I will work on that. We need to have in mind that the X server itself does not yet have support for trackpad gestures - the API and code is under review. I will need some way to prove to the X server reviewers that the API is sound and for that real (even if experimental and not reviewed/merged/released) API consumers in the widget toolkits is the best way. Cheers, Povilas [1]: https://gitlab.freedesktop.org/xorg/driver/xf86-input-libinput/-/merge_requests/17 _______________________________________________ Development mailing list [email protected] https://lists.qt-project.org/listinfo/development
