using Gtk;

/**
 * Loads the list of files in user's home directory and displays them
 * in a GTK+ list view.
 */
class ASyncGIOSample : Window {

    private ListStore model;

    public ASyncGIOSample () {

        // Set up the window
        set_default_size (300, 200);
        this.destroy.connect (Gtk.main_quit);

        // Set up the list widget and its model
        this.model = new ListStore (1, typeof (string));
        var list = new TreeView.with_model (this.model);
        list.insert_column_with_attributes (-1, "Filename",
                                            new CellRendererText (), "text", 0);

        // Put list widget into a scrollable area and add it to the window
        var scroll = new ScrolledWindow (null, null);
        scroll.set_policy (PolicyType.NEVER, PolicyType.AUTOMATIC);
        scroll.add (list);
        add (scroll);

        // start file listing process
        list_directory.begin ();
    }

    private async void list_directory () {
        stdout.printf ("Start scanning home directory\n");
        var dir = File.new_for_path (Environment.get_home_dir ());
        try {
            // asynchronous call, to get directory entries
            var e = yield dir.enumerate_children_async (FileAttribute.STANDARD_NAME,
                                                        0, Priority.DEFAULT);
            while (true) {
                // asynchronous call, to get entries so far
                var files = yield e.next_files_async (10, Priority.DEFAULT);
                if (files == null) {
                    break;
                }
                // append the files found so far to the list
                foreach (var info in files) {
                    TreeIter iter;
                    this.model.append (out iter);
                    this.model.set (iter, 0, info.get_name ());
                }
            }
        } catch (Error err) {
            stderr.printf ("Error: list_files failed: %s\n", err.message);
        }
    }

    static int main (string[] args) {
        Gtk.init (ref args);

        var demo = new ASyncGIOSample ();
        demo.show_all ();

        Gtk.main ();
        return 0;
    }
}