Re: Enable / disable a Gio::SimpleAction.

Have you seen the gtkmm tutorial?
https://developer.gnome.org/gtkmm-tutorial/3.24/gtkmm-tutorial.html
One of the examples in the /Menus and Toolbars/ chapter has a menu with 
radio items.

There is also a menu demo among the gtkmm demo programs.
https://gitlab.gnome.org/GNOME/gtkmm/-/blob/gtkmm-3-24/demos/gtk-demo/example_menus.cc
The demo program uses Gtk::RadioMenuItem.

If you want to simplify the future upgrade of your program from gtkmm3 
to gtkmm4, I recommend that you look at the tutorial example in the 
first place. It does not use Gtk::RadioMenuItem. There are no 
specialized radio button classes or radio menu item classes in gtkmm4. 
(It's still possible to make GUIs with radio buttons and radio menu items.)

On 2020-10-06 15:47, Carlo Wood wrote:
> I have another problem with the same popup menu: I need certain menu
> entries to be radio actions (that is, only one can be selected at
> a time, but there are multiple such groups in the single popup menu).
>
> For example, I have:
>
> Gtk::RadioAction::Group group_to_move;
> m_refToMoveWhite_action = Gtk::RadioAction::create(group_to_move, "ToMoveWhite", "White to play");
> m_refToMoveBlack_action = Gtk::RadioAction::create(group_to_move, "ToMoveBlack", "Black to play");
>
> where the menu is read from a .glade file with Gtk::Builder, containing:
>
>      <child>
>        <object class="GtkRadioMenuItem" id="ToMoveWhite">
>          <property name="visible">True</property>
>          <property name="can_focus">False</property>
>          <property name="action_name">PlacepieceMenu.ToMoveWhite</property>
>          <property name="label" translatable="yes">White to play</property>
>          <property name="use_underline">True</property>
>          <property name="draw_as_radio">True</property>
>        </object>
>      </child>
>      <child>
>        <object class="GtkRadioMenuItem" id="ToMoveBlack">
>          <property name="visible">True</property>
>          <property name="can_focus">False</property>
>          <property name="action_name">PlacepieceMenu.ToMoveBlack</property>
>          <property name="label" translatable="yes">Black to play</property>
>          <property name="use_underline">True</property>
>          <property name="draw_as_radio">True</property>
>        </object>
>      </child>
>
> Now I want a function to be called when I click these entries.
>
> In the 2.4 code I had something like:
>
>      m_refActionGroup->add_action(m_refToMoveWhite_action, sigc::mem_fun(*this, &ChessPositionWidget::on_menu_to_move_white));
>      m_refActionGroup->add_action(m_refToMoveBlack_action, sigc::mem_fun(*this, &ChessPositionWidget::on_menu_to_move_black));
>
> But that doesn't compile anymore. Because so many things got deprecated, the types of many variables
> had to change and now I can't combine them anymore :/.
>
> Ie, m_refActionGroup now has the type:
>
>      Glib::RefPtr<Gio::SimpleActionGroup> m_refActionGroup;
>
> maybe that has to be Glib::RefPtr<Gio::ActionGroup> before I can add both Gio::SimpleAction's
> and Gtk::RadioAction to it? The latter isn't derived from Gio:Action either though :/.
>
> I am totally stuck on this. Also cannot find any example that shows how to do this.
>
> I am just very confused about how all this is supposed to work. Before it seemed like that
> if I wanted to make a big pop-up menu then EVERY entry in the menu had to be an action
> and well all of the same group (that was using Gtk::UIManager). Now I'm using Gio::Action
> and Gtk::Builder instead and I have no idea how to make it working again.
>
> Carlo Wood
>
>
>

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