test-vblank.vala

using Clutter;

private bool moved = false;
private Actor rect;

private int main(string[] args) {
    if (Clutter.init(ref args) != InitError.SUCCESS) return 1;

    var stage = new Stage();
    stage.destroy.connect(() => {
        Clutter.main_quit();
    });
    stage.key_press_event.connect((key) => {
        if(key.keyval == Key.Escape) Clutter.main_quit();
        return false;
    });
    stage.width = 1360;
    stage.height = 768;
    stage.visible = true;

    rect = new Actor();
    rect.background_color = {255, 0, 0, 255};
    rect.width = 100;
    rect.height = 768;

    rect.transitions_completed.connect(() => {
        move();
    });

    stage.add_child(rect);

    move();

    Clutter.main();

    return 0;
}

private void move() {
    rect.save_easing_state();
    rect.x = moved ? 1260 : 0;
    rect.restore_easing_state();
    moved = !moved;
}