Re: [Qemu-devel] [PATCH v3 4/4] gtk: Add "Grab On Click" option

[Takashi Iwai <tiwai@suse.de>]

At Tue, 8 Apr 2014 11:57:19 +0300,
Michael S. Tsirkin wrote:
> 
> On Tue, Apr 08, 2014 at 10:49:57AM +0200, Gerd Hoffmann wrote:
> > On Di, 2014-04-08 at 11:11 +0300, Michael S. Tsirkin wrote:
> > > On Tue, Apr 08, 2014 at 08:25:34AM +0200, Gerd Hoffmann wrote:
> > > > On Mo, 2014-04-07 at 23:38 +0300, Michael S. Tsirkin wrote:
> > > > > On Mon, Apr 07, 2014 at 10:07:43AM +0200, Gerd Hoffmann wrote:
> > > > > > On Fr, 2014-04-04 at 12:41 +0200, Takashi Iwai wrote:
> > > > > > > I simply like it better, you don't? :)
> > > > > > 
> > > > > > I still think we should make this simply depend on absolute/relative
> > > > > > pointer mode instead of asking the user to switch it manually.
> > > > > 
> > > > > Hmm how do I set absolute/relative mode?
> > > > 
> > > > Depends on the pointer input device being used.
> > > > 
> > > > Start guest with "-device usb-tablet".  Go to HMP.  'info mice' should
> > > > list the ps/2 mouse and the usb tablet.  Using 'mouse_set' (or was it
> > > > set_mouse?) you can force one of the two devides being used.
> > > > 
> > > > If you pick the tablet (should be active by default) absolute pointer
> > > > events are passed to the guest, and qemu works in absolute mode (i.e.
> > > > sdl doesn't do pointer grabs).
> > > > 
> > > > If you pick the mouse relative mouse events are passed to the guest, and
> > > > qemu works in relative mode (pointer grab is pretty much required to
> > > > work with the guest).
> > > > 
> > > > cheers,
> > > >   Gerd
> > > > 
> > > 
> > > I have to say grab on click is easier to understand - more predictable.
> > > Not requesting that it's made the default, but an option would be nice.
> > 
> > Well, usually you'll never ever pick the pointer device manually, this
> > is mainly meant for testing things or checkout what the behavior is.
> > 
> > Another topic is how to actually activate the grab (when in relative
> > mode where it is needed).  You surely don't want grab the pointer on
> > hover as simply crossing the guest window will activate it.
> 
> Sounds kind of useful. Why isn't it?
> 
> > Grab-(+ungrab)-by-hotkey and grab-on-click is what SDL, virt-viewer &
> > friends are doing today.  I think gtk should simply do the same for
> > consistency, and I don't see a need for a config option.
> > 
> > cheers,
> >   Gerd
> 
> Aha.
> It's lack of grab on click that makes me unhappy.
> So how about doing this for 2.0?
> Drop grab on hover make grab on click the default.

OK, I'll submit a revised patch to implement grab-on-click only in
relative mode.


Takashi