> > There's a few steps to handle autorotation: > > > > 1. Detect rotation > > - Listen for lid switch events? > > - Listen for accelerometer events? > > 2. Rotate screen using XRandR > > 3. Rotate touchscreen input devices > > - X server has a "Coordinate Transformation Matrix" property for each > > device, use it to perform input coordinate transformation > > > > I have a feeling that step 1 will be hardest, because I don't think > > there's any standard way to determine device orientation. We probably > > need some system-wide service to watch for these types of events and > > handle them appropriately. > > > > Step 2 is already performed by gnome-settings-daemon (g-s-d) when you > > connect or disconnect a monitor. I would think it could be extended for > > this purpose. > > > > For step 3 we need a mapping from touchscreens to Xinerama screens. We > > don't currently have any tool to do this. If you have a touchscreen on > > one monitor, and you plug in another, you will need to set the transform > > matrix manually or else your touchscreen will operate over the entire X > > screen! I don't know where this mapping should live, but if g-s-d could > > get to it then it could also handle this too. > > > >> The good news is that kernel input subsystem has added (maybe not in the > >> tree yet, Henrik should be able to tell us more) a new set of ioctl so > >> we can retrieve the device types directly from the kernel. With this new > >> ioctl, generic "device self-identification" is available. > > > > Yep, this will be very useful for setting up devices. In XI 2.1, devices > > will have a "mode" that tells us whether it's being used as a > > touchscreen or a touchpad or something else. g-s-d could look for these > > devices to map them to xinerama displays. > > > > I have a feeling we should revisit this at UDS to map out how this > > should be tackled. There's a good chunk of development here, but it > > shouldn't be too difficult with the apis and interfaces we have already. > > Agreed :-) In fact, I agreed so much, the first uTouch (and maybe DX > Team?) blueprint has been created for UDS O in Budapest: > > https://blueprints.launchpad.net/ubuntu/+spec/dx-o-auto-rotate > > Already looking forward to more good discussions :-)
Sounds like a good plan! Henrik _______________________________________________ Mailing list: https://launchpad.net/~multi-touch-dev Post to : multi-touch-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~multi-touch-dev More help : https://help.launchpad.net/ListHelp
