Re: Re: Disable Alt+F4

[american communist party gmail com]

This is some nice information to have, ty Milosz Derezynski.

On Dec 13, 2009 7:10pm, Milosz Derezynski <internalerror gmail com> wrote:
> That problem is simple to solve but a little difficult to explain and expand on depending on how your setup works.
> 
> If you use this mechanism in your app:
> 
> 
>   Gtk::Main kit (argc, argc);
> 
>   Gtk::Window my_toplevel ;
>   // some other code to setup the app in between
>   kit.run( my_toplevel );
> 
> 
> then the ALT+F4 will be handled by the Gtk::Main instance.
> 
> 
> 
> Let me expand on this:
> 
> 
> What happens when you press ALT+F4 on a window, or click the 'x' in the titlebar, or use any other mechanism the window manager employs for "closing" a window is that you cause a "delete" event to be emitted for that particular window. That event in itself does nothing, but Gtk::Main run with a window as argument is coded so that it hides the window, possibly even destroys (unrefs?) the main window instance and exits the Gtk+ main loop.
> 
> 
> 
> If you don't do it like above, but like this:
> 
> 
>   Gtk::Main kit (argc, argc);
>   Gtk::Window my_toplevel ;
>   // some other code to setup the app in between
> 
>   my_toplevel.show();
>   kit.run();
> 
> 
> you retain full control on what to do when a delete-event occurs. See this documentation: http://library.gnome.org/devel/gtkmm/unstable/classGtk_1_1Widget.html#aa97a4453ec12f7fce163353c2bcaf580
> 
> 
> 
> You have two ways of dealing with this and avoiding the window to be hidden or actually anything happening at all.
> 
> 
> The first is, you derive from Gtk::Window and override on_delete_event:
> 
> 
> 
>   class MyOwnWindow : public Gtk::Window
>   {
>      protected:
>      
>          virtual bool
>          on_delete_event( GdkEventAny* G_GNUC_UNUSED )
> 
>          {
>             /* do whatever you want to do when the user presses ALT+F4, clicks 'x' or whatever other means the user uses to close the window*/
> 
> 
>             return true; // important
> 
>          }
>   };
> 
> 
> The other way is to connect to delete_event(), but using true as the 2nd argument to connect() to indicate that you want it to be called before the default signal handlers will be called: (see http://library.gnome.org/devel/gtkmm/unstable/classGtk_1_1Widget.html#a6b266f24d662c145fa301ca0bd011716 )
> 
> 
> 
> 
>   bool
>   on_my_toplevel_delete_handler( GdkEventAny* G_GNUC_UNUSED )
>   {
>     /* do whatever you want to do when the user presses ALT+F4, clicks 'x' or whatever other means the user uses to close the window*/
> 
>   }
> 
> 
>   int main( int argc, char* argv[])
>   {
>     Gtk::Main kit (argc, argc);
>     Gtk::Window my_toplevel ;
>     // some other code to setup the app in between
> 
>     my_toplevel.signal_delete_event().connect( sigc::ptr_fun( &on_my_toplevel_delete_handler ), true /* important! */ );
>     my_toplevel.show();
>     kit.run();
>   }
> 
> 
> 
> That is basically it.
> 
> 2009/12/11 Robert Hildebrandt roberts_katz gmx de>
> 
> Hi,
> 
> I want to disable the Alt+F4 shortcut on a window which has an progressbar for an not interruptable process.
> 
> I know how to do it on Win32 - is there a also way to disable it with Gtmm?
> 
> lG Robert
> 
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