Re: using global.display.begin_grab_op to move a window

["Jasper St. Pierre" <jstpierre mecheye net>]

On Fri, Jun 15, 2012 at 1:41 AM, Amy C <mathematical coffee gmail com> wrote:
> Hi all,
>
> I'm trying to implement the functionality of 'Move' in the right-click
> menu of a window (you right click the system title bar, select 'move',
> and then moving your cursor about moves the target window about until
> you click, on which it then has its position set). Note that this is
> not a drag operation as the cursor does not need to be held down while
> you're moving the window around.
>
> I was suggested to use global.display.begin_grab_op on the window, so
> this is what I'm doing:
>
>    global.display.begin_grab_op(global.screen, window, Meta.GrabOp.MOVING,
>                                               false /* whether
> cursor's already grabbed */,
>                                               true /* frame action */,
>                                               1    /* primary mouse button */,
>                                               0    /* event flags */,
>                                               global.get_current_time(),
>                                               x,  /* x coord of the window */
>                                               y); /* y coord of the window */
>
> However, this always fails with:
>
> Window manager warning: Attempt to perform window operation 1 on
> window 0x2006f32 when operation 38 on none already in effect.
>
> A bit of digging around revelas that operation 38 is
> Meta.GrabOp.COMPOSITOR, which "is returned if a compositor-plugin
> modal operation is in effect".
>
> My grab op won't happen until this one finishes, but it looks like
> this is always in effect (thanks to calls to meta_plugin_begin_modal
> on the global stage).

Ah, sorry, I didn't think of that. The grab is due to the app menu.
You might be able to use a Meta.run_later; I'm not entirely sure.

> If I try to finish the grab op 38
> (global.display.end_grab_op(global.get_current_time()) and then
> perform my command, it works, but on finishing moving my window around
> I can't get focus back to the global stage - clicking & keyboard don't
> work. I have to switch to tty to gnome-shell --replace to get
> funcitonality back.
>
> So how do I do my grab op without interfering with gnome-shell? Should
> I try ending the grab op as before, but set a signal for when I'm
> finished moving the window to call global.begin_modal (??) to restore
> the grab op 38 that gnome-shell has?
>
> cheers.
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-- 
  Jasper