delay, onComplete

gistfile1.js

const Clutter = imports.gi.Clutter;
const Tweener = imports.tweener.tweener;

function click(actor, ev) {
    if (ev.get_button() == 1) {
        Tweener.addTween(t, {time: 1.0, x: t.x+100});
        Tweener.addTween(t, {time: 1.0, y: t.y+100, delay: 1.0});
        Tweener.addTween(t, {time: 1.0, scale_x:t.scale_x*0.5, delay: 2.0});
    }
    else {
        Tweener.addTween(t, { time: 1.0, x: t.x+100,
                              onComplete: function() {
                                  print("onComplete");
                              }
                            });
    }
    print('Clicked!');
    return true;
}

function quit(actor) {
    Clutter.main_quit();
}

Clutter.init(0, null);
let stage = new Clutter.Stage();
let t= new Clutter.Texture({ filename: 'test.jpg',
                                    reactive: true });
t.connect('button-press-event', click);
stage.connect('destroy', quit);
stage.add_actor(t);
stage.show();

Clutter.main();