ui: Show message when Konami Code is performed

Show a message in the info box when the Konami Code is performed on the
collection view.

Fixes #247

src/ui/application-window.vala

@@ -31,6 +31,8 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
 
 				break;
 			}
+
+			konami_code.reset ();
 		}
 		get { return _ui_state; }
 	}
@@ -78,6 +80,8 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
 	private Cancellable run_game_cancellable;
 	private Cancellable quit_game_cancellable;
 
+	private KonamiCode konami_code;
+
 	public ApplicationWindow (ListModel collection) {
 		collection_box.collection = collection;
 	}
@@ -94,6 +98,9 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
 		                                        BindingFlags.BIDIRECTIONAL);
 		header_bar_fullscreen_binding = bind_property ("is-fullscreen", display_header_bar, "is-fullscreen",
 		                                               BindingFlags.BIDIRECTIONAL);
+
+		konami_code = new KonamiCode (this);
+		konami_code.code_performed.connect (on_konami_code_performed);
 	}
 
 	public void run_game (Game game) {
@@ -293,4 +300,10 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
 				runners.remove (game);
 		}
 	}
+	private void on_konami_code_performed () {
+		if (ui_state != UiState.COLLECTION)
+			return;
+
+		collection_box.display_error (KonamiCode.CODE_STRING);
+	}
 }