How to connect GtkModelButton

Question

Helo,

I've got the following .ui file:

<child>
  <object class="GtkModelButton" id="button_neworder">
    <property name="can_focus">True</property>
    <property name="text" translatable="yes">Neuer Auftrag</property>
    <property name="action-name">?</property>
    <property name="visible">True</property>
  </object>
</child>

And the following ApplicationWindow:

public class Window : Gtk.ApplicationWindow {
    [GtkChild]

    private unowned Gtk.ListBox listbox_jobs;
    private unowned Gtk.Button button_neworder;

    public Window (Gtk.Application app) {
        Object (application: app, title: "Auftragsverwaltung");
        this.button_neworder.clicked.connect(this.method);
    }

    public void method() {
    }
}

How can I create a clicked signal with GtkModelButton?

The code

this.button_neworder.clicked.connect(this.method);

doesnt work.

Answer 1

You need to add your signal to the .ui file with <signal/>:

...
<child>
  <object class="GtkModelButton" id="button_neworder">
    <property name="can_focus">True</property>
    <property name="text" translatable="yes">Neuer Auftrag</property>
    <property name="action-name">?</property>
    <property name="visible">True</property>
    <signal name="clicked" handler="button_neworder_clicked" />
  </object>
</child>
...

and identify the method as a callback with [GtkCallback]:

[GtkTemplate(ui = "/template/window.ui")]
public class Window : Gtk.ApplicationWindow {
    [GtkChild]

    private unowned Gtk.ListBox listbox_jobs;
    private unowned Gtk.Button button_neworder;

    public Window (Gtk.Application app) {
        Object (application: app, title: "Auftragsverwaltung");
        this.button_neworder.clicked.connect(this.method);
    }

    [GtkCallback]
    public void button_neworder_clicked(Gtk.ModelButton button) {
    }
}