Hide/Show animation

I would like to know if it is possible to make an animation on hide/show panel with simple gwt (without addito开发者_StackOverflow中文版nnal librairies).

Any suggestions are welcome.

Thanks

GWT's Layout classes support animation. Check out Layout, DockLayout en SplitLayout. Furthermore, there is an Animation class, which is used in several panels for using animation to show/hide the content. Simply check the classes using the Animation class.

Maybe you will find this code useful from NotificationMole:

private class MoleAnimation extends Animation {
    private int endSize;
    private int startSize;

    @Override
    protected void onComplete() {
      if (endSize == 0) {
        borderElement.getStyle().setDisplay(Display.NONE);
        return;
      }
      borderElement.getStyle().setHeight(endSize, Unit.PX);
    }

    @Override
    protected void onUpdate(double progress) {
      double delta = (endSize - startSize) * progress;
      double newSize = startSize + delta;
      borderElement.getStyle().setHeight(newSize, Unit.PX);
    }

    void animateMole(int startSize, int endSize, int duration) {
      this.startSize = startSize;
      this.endSize = endSize;
      if (duration == 0) {
        onComplete();
        return;
      }
      run(duration);
    }
  }

Usage:

• to hide panel:

  animation.animateMole(heightMeasure.getOffsetHeight(), 0, animationDuration);

• to show:

  borderElement.getStyle().setDisplay(Display.BLOCK);
  animation.animateMole(0, heightMeasure.getOffsetHeight(), animationDuration);

Where borderElement - container DivElement and heightMeasure - inner DivElement.