This ComboBox prints to the terminal when you change your selection.
/* A window in the application */
class MyWindow : Gtk.ApplicationWindow {
/* An instance array of linux distributions belonging to this window. */
string[] distros = {"Select distribution", "Fedora", "Mint", "Suse"};
/* This enum makes the code more readable when we refer to
* the column as Column.DISTRO, instead of just 0.
*/
enum Column {
DISTRO
}
/* Constructor */
internal MyWindow (MyApplication app) {
Object (application: app, title: "Welcome to GNOME");
this.set_default_size (200, -1);
this.border_width = 10;
Gtk.ListStore liststore = new Gtk.ListStore (1, typeof (string));
for (int i = 0; i < distros.length; i++){
Gtk.TreeIter iter;
liststore.append (out iter);
liststore.set (iter, Column.DISTRO, distros[i]);
}
Gtk.ComboBox combobox = new Gtk.ComboBox.with_model (liststore);
Gtk.CellRendererText cell = new Gtk.CellRendererText ();
combobox.pack_start (cell, false);
combobox.set_attributes (cell, "text", Column.DISTRO);
/* Set the first item in the list to be selected (active). */
combobox.set_active (0);
/* Connect the 'changed' signal of the combobox
* to the signal handler (aka. callback function).
*/
combobox.changed.connect (this.item_changed);
/* Add the combobox to this window */
this.add (combobox);
combobox.show ();
}
/* Signal handler for the 'changed' signal of the combobox. */
void item_changed (Gtk.ComboBox combo) {
if (combo.get_active () !=0) {
print ("You chose " + distros [combo.get_active ()] +"\n");
}
}
}
/* This is the application */
class MyApplication : Gtk.Application {
/* Constructor */
internal MyApplication () {
Object (application_id: "org.example.MyApplication");
}
/* Override the activate signal of GLib.Application,
* which is inherited by Gtk.Application.
*/
protected override void activate () {
/* Create the window of this application
* and show it.
*/
new MyWindow (this).show ();
}
}
/* main creates and runs the application */
int main (string[] args) {
return new MyApplication ().run (args);
}
In this sample we used the following:
Gtk.ListStore
Gtk.ComboBox
Gtk.CellRendererText
set_attributes