Migration of windows between displays
Jim.Gettys at hp.com
Thu Nov 11 21:53:05 EET 2004
Phil Blundell has done this on the iPAQ (migrating from a small screen
to a workstation).
The big issue is making sure applications can't be easily hijacked; some
sort of authentication mechanism is required to ensure that doesn't
So yes, we need a standard in this area, and we also need to worry about
the security consequences.
There is other implementation work to fully flesh out this vision:
a) right now, gtk can't quite remove itself entirely from the
display; some more work is needed there.
b) Xlib needs some work to allow applications to be notified if
their display connection fails. I did some work here a year
ago, but haven't had time to complete it since, due to all
the XFree86/X.org upheavals and subsequent transition.
c) we need to deal with the security issues that this
- Jim Gettys
On Wed, 2004-11-10 at 17:50 +1300, Perry Lorier wrote:
> Gtk has an API function gtk_window_set_screen() that lets you move a
> window from one screen/display to another. This is easily demonstrated
> by the gtk-demo applications "Change Display" example. I've written a
> patch against gtk that listens for a _GTK_CHANGE_DISPLAY xproperty
> notification and when recieved calls the gtk function mentioned above to
> move the windows display. This provides a foundation for more
> interesting applications that can be written, such as providing
> migration of user sessions between computers, "detaching" applications
> by moving them onto an Xvnc server, making x2x style programs more
> versitile, "dragging" windows between non-xinerama multihead displays etc.
> It's been suggested that I post here to discuss coming up with a common
> specification so that other toolkits can provide the same
> functionality. Also it was suggested that instead of using property
> notification I use a ClientMessage to trigger the movement instead.
> The bugzilla entry is available here:
> What are peoples comments on this idea?
> : I'm kinda new to gnome/x11 coding, my humblest apologies in advance
> for any mistakes I might make.
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