Hi Florian, > I have a touch screen which generates a plethora of event types > according to libinput-debug-events (including what seems to be > multi-touch events). I can even see distinct events for the digitizer > pen. > > However, further up the stack, all this is gone. I don't get any > two-finger scrolling, for instance. There is no right-button > emulation in Firefox, either. I can still generate primary button > click events and (single-finger) drag events, but that's about it. Handling of touch events is up to the application. Besides the minimal single-touch to pointer event emulation (which only applies to X11/Xwayland) there are no emulation layers making this up for applications that don't know about touch events themselves. GTK+3 provides built-in support for 1 finger touch scrolling, text edition popovers, text selection handles and other touch features. App can nonetheless be developed in touch unfriendly ways, so some some attention is needed throughout the stack. For example the gnome HIG largely avoids popup menus, even more for stuff that is inaccessible otherwise. Other apps/toolkits/etc have to actively take care of touch support themselves. Firefox, despite "using" GTK+, implements itself large parts of their UI, if they don't observe touch input, it's pretty much for them to make use of it too. It's worth pointing out that, at least as far as gtk3 is concerned, you are expecting the wrong gestures, scrolling happens on 1 finger input, the "long press" gesture doesn't necessarily map to "right click", etc. > > With Wayland, the pen appears to be completely dead. With X, I get Can you interact with gnome-shell with it? or is it entirely dead? > some reaction to the pen in Xournal (some pointer indication moves), > but Xournal does not put any ink on the screen. Not entirely sure what's up with X. As xournal is a GTK+2 application it requires Xwayland support for it on wayland. There are already patches in Xorg patchwork adding this missing bridging for tablet events. > > How can I help to improve matters in this area? You should perhaps file/ping bugs regarding touch support in your favorite apps, and/or wait for ports to GTK+3. Cheers, Carlos _______________________________________________ desktop mailing list -- desktop@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to desktop-leave@xxxxxxxxxxxxxxxxxxxxxxx
