public void choosePresentation(GLCanvas canvas) {
    PresentationLoader loader = new PresentationLoader();
    loader.loadPresentation(
        presentation, canvas, getLayouter(), getAnimationStyles(), getAnimationPathLayouter());

    canvas.requestFocus();
  }
  public void loadPresentation(File[] files, GLCanvas canvas) {
    PresentationLoader loader = new PresentationLoader();
    loader.loadPresentation(
        presentation,
        canvas,
        getLayouter(),
        getAnimationStyles(),
        getAnimationPathLayouter(),
        files);

    canvas.requestFocus();
  }