Re: [Spice-devel] [Qemu-devel] Re: paravirtual mouse/tablet

From: Alon Levy <alevy@redhat.com>
To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: spice-devel <spice-devel@lists.freedesktop.org>,
	Stefan Hajnoczi <stefanha@gmail.com>,
	Gerd Hoffmann <kraxel@redhat.com>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Spice-devel] [Qemu-devel] Re:  paravirtual mouse/tablet
Date: Fri, 14 Jan 2011 18:10:54 +0200	[thread overview]
Message-ID: <20110114161053.GA11189@playa.redhat.com> (raw)
In-Reply-To: <20110114145235.GB14887@redhat.com>

On Fri, Jan 14, 2011 at 02:52:35PM +0000, Daniel P. Berrange wrote:
> On Fri, Jan 14, 2011 at 04:28:52PM +0200, Alon Levy wrote:
> > On Fri, Jan 14, 2011 at 10:48:50AM +0000, Daniel P. Berrange wrote:
> > > On Fri, Jan 14, 2011 at 09:49:40AM +0100, Gerd Hoffmann wrote:
> > > > >>>That maybe implies that we need an offscreen coordinate for the
> > > > >>>mouse so that you can hide the mouse when it leaves one window.
> > > > >>
> > > > >>Hmm? I fail to see why multihead is special here.
> > > > >
> > > > >If you show two mice in the guest, would X render two cursors?
> > > > 
> > > > With two mice you still have just one cursor.  Just plug a usb mouse
> > > > into your laptop, you can move the single pointer with both usb
> > > > mouse and touchpad then.  Didn't try what happens with two tablets,
> > > > but I expect it wouldn't be different ...
> > > 
> > > NB having all mice bound to one cursor is merely the historical
> > > default behaviour. IIUC the recent "Multi-Pointer X" feature
> > > lets you now have multiple cursors, one per pointing device.
> > > 
> > > https://secure.wikimedia.org/wikipedia/en/wiki/Multi-Pointer_X
> > 
> > Yes, you can enable that, and if we want to have multiple pointers then
> > they shouldn't disappear - that would be the case if multiple users
> > where connected, each with their own cursor. You expect the non active cursor
> > to remain (maybe X hides it after some seconds of inactivity, guest
> > specific).
> 
> Multi-Pointer X isn't just about allowing different users
> to have their own pointer. It is explicitly designed to allow
> one person to control multiple pointers at the same time and
> to allow applications to receive events from multiple devices
> concurrently.

Yes, of course, I didn't suggest otherwise. I don't even think most setup's
will be able to distinguish these two scenarios.

> 
> Regards,
> Daniel
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