Re: Enable / disable a Gio::SimpleAction.

On 2020-10-05 17:07, Kjell Ahlstedt wrote:
>
> Gio::SimpleActionGroup belongs to glibmm, not to gtkmm. Both gtkmm 2.x 
> and gtkmm 3.x use glibmm versions from the glibmm-2.4 ABI series. I 
> don't understand how you can do what you say you do in gtkmm 2.x. 
> Haven't you used Gtk::ActionGroup and Gtk::Action?  Something like
>
>     Glib::RefPtr<Gtk::ActionGroup> m_refActionGroup;
> ...
> m_refActionGroup->get_action("PlacepieceBlackPawn")->set_sensitive(row 
> != 0 && row != 7);
>
> Gtk::ActionGroup and Gtk::Action are deprecated in gtkmm 3.x and removed in gtkmm 4.x.
>
> How do you add the Gio::SimpleAction to the Gio::SimpleActionGroup? I suppose you have a
>
> 	Glib::RefPtr<Gio::SimpleAction> refPlacepieceBlackPawn = ......
> or a
> 	m_refActionGroup->add_action("PlacepieceBlackPawn"); that returns a Glib::RefPtr<Gio::SimpleAction>.	
>
> Then it would be easy to save that Glib::RefPtr<Gio::SimpleAction>, so you don't need lookup_action().
> If you prefer lookup_action(), this should work in gtkmm 3.x, but not in gtkmm 4.x:
>
> 	auto simple_action = Glib::RefPtr::cast_dynamic<Gio::SimpleAction>(m_refActionGroup->lookup_action("PlacepieceBlackPawn"));
Shall be

auto simple_action = Glib::RefPtr<Gio::SimpleAction>
::cast_dynamic(m_refActionGroup->lookup_action("PlacepieceBlackPawn"));

> 	if (simple_action)
> 	  simple_action->set_enabled(row != 0 && row != 7);
>
>

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