Re: testinput - how to get events when coreptr not in window

[James Henstridge <james daa com au>]

First of all, this is a list for development _of_ gtk+, rather than 
_with_ gtk+.  Maybe your question would have been more appropriate on 
gtk-list or gtk-app-devel-list.

Philip Brown wrote:

> Hello,
>
> I'd like to adjust gtk/testinput, so that it will receive and respond to 
> XINPUT events, while the core pointer is outside the main drawing area.
>
> [Setting mode='Screen' is not adquate. I wish to have mode='Window' work]
>  
> I've experiented with some direct X11(non-gtk) XINPUT programs, and in
> principle, it works fine, as long as XSelectExtensionEvent() is called with
> the root window as the target.
>
> However.... there does not seem to be a way to DO that, with gtk currently.
> (gtk1.2.10)
>
> gtk_widget_set_extension_events()
>
> only takes GtkWidget type as an argument.  I dont know of a gtkwidget
> wrapper around the root window.
>
> So far, I have tried,
>
> -  gtk_widget_set_extension_events(GDK_ROOT_PARENT(), ...)
> -  gtk_widget_set_extension_events(gdk_root_parent, ...)
>
> -  gtkrootwin=gdk_window_foreign_new(GDK_ROOT_WINDOW ());
>   gtk_widget_set_extension_events(gtkrootwin,...)
>
> but none of these seem to work out. Even the last one gives an error,
>
>  Gtk-CRITICAL **: file gtkwidget.c: line 3906
>  (gtk_widget_set_extension_events): assertion `GTK_IS_WIDGET (widget)'
>  failed.
>
>
> Could someone give me a pointer as to how I should proceed, please?
>
> I'm new to gtk programming, so please excuse me if I've missed the "obvious"
> gtk solution.
>  
gtk_widget_set_extension_events() works with GtkWidgets (which are 
equivalent to Xt widgets rather than xlib Window objects).  You might 
want to try gdk_input_set_extension_events(), which works with a 
GdkWindow (such as the root parent).

James.

--
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