function SceneListener() { this.onSceneOpen = onSceneOpen; function onSceneOpen(aScene) { if (aScene) { shell.print("Opening Scene = " + aScene.url); } } this.beforeSceneClose = beforeSceneClose; function beforeSceneClose(aScene) { if (aScene) { shell.print("Closing Scene = " + aScene.url); } } this.onSceneClosed = onSceneClosed; function onSceneClosed(aScene) { if (aScene) { shell.print("Closed Scene = " + aScene.url); } } }