audrey/src/ui/play_queue.vala

[GtkTemplate (ui = "/eu/callcc/audrey/ui/play_queue_song.ui")]
class Ui.PlayQueueSong : Gtk.ListBoxRow {
    public uint position { get; set; }
    public Subsonic.Song song { get; set; }

    [GtkCallback] private string format_duration (int duration) {
        return "%02d:%02d".printf(duration/60, duration%60);
    }

    [GtkCallback] private string star_button_icon_name (DateTime? starred) {
        return starred == null ? "non-starred" : "starred";
    }
}

[GtkTemplate (ui = "/eu/callcc/audrey/ui/play_queue.ui")]
public class Ui.PlayQueue : Adw.NavigationPage {
    private Playbin _playbin;
    public Playbin playbin {
        get { return _playbin; }
        set {
            assert (_playbin == null); // only set once
            _playbin = value;

            _playbin.play_queue.items_changed.connect (this.on_store_items_changed);
            this.can_clear_all = _playbin.play_queue.get_n_items () > 0;

            _playbin.notify["play-queue-position"].connect (() => {
            });
        }
    }

    public bool can_clear_all { get; private set; }

    [GtkCallback] private void on_clear () {
        this.playbin.play_queue.remove_all ();
    }

    private void on_store_items_changed (GLib.ListModel store, uint position, uint removed, uint added) {
        this.can_clear_all = store.get_n_items () > 0;
    }

    [GtkCallback] private void on_song_list_setup (Gtk.SignalListItemFactory factory, Object object) {
        var item = object as Gtk.ListItem;
        var child = new PlayQueueSong ();

        item.child = child;
    }

    [GtkCallback] private void on_song_list_bind (Gtk.SignalListItemFactory factory, Object object) {
        var item = object as Gtk.ListItem;
        var child = item.child as PlayQueueSong;

        child.position = item.position+1;
        child.song = item.item as Subsonic.Song;
    }

    [GtkCallback] private void on_row_activated (uint position) {
        playbin.select_track (position);
    }
}