Re: Enable / disable a Gio::SimpleAction.

[Carlo Wood <carlo alinoe com>]

On Tue, 6 Oct 2020 09:04:07 +0200
Kjell Ahlstedt <kjellahlstedt gmail com> wrote:

> 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);

Thanks that works.


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