Animated Focus Transition For Regular Components

Lists in LWUIT have a great animation by default to show the transition between elements in the list. Components placed in the form don't have that animation by default, but they can thanks to the ability to infinitely customize everything about LWUIT.
The animation is comprised of motion objects tracking the transition from one element to the next and painting an overlay before setting the actual focus element, the code is really very simple...

class FocusAnimation extends Form {
   private Component futureFocus;
   private Motion focusMotionX;
   private Motion focusMotionY;
   private Motion focusMotionWidth;
   private Motion focusMotionHeight;
   public FocusAnimation() {
       super("Focus Animation");
       for(int iter = 1 ; iter < 5 ; iter++) {
           addComponent(new Button("Button " + iter));
       }
       addComponent(new TextArea("Multi-line text\nwith several\ndifferent lines", 3, 20));
       addComponent(new List(new Object[] {"Entry 1", "Entry 2", "Entry 3"}));
       addComponent(new ComboBox(new Object[] {"Entry 1", "Entry 2", "Entry 3"}));
   }

   public void setFocused(Component c) {
       Component current = getFocused();
       if(current != null && current != c) {
           futureFocus = c;
           focusMotionX = Motion.createSplineMotion(current.getAbsoluteX(), futureFocus.getAbsoluteX(), 300);
           focusMotionY = Motion.createSplineMotion(current.getAbsoluteY(), futureFocus.getAbsoluteY(), 300);
           focusMotionWidth = Motion.createSplineMotion(current.getWidth(), futureFocus.getWidth(), 300);
           focusMotionHeight = Motion.createSplineMotion(current.getHeight(), futureFocus.getHeight(), 300);
           focusMotionX.start();
           focusMotionY.start();
           focusMotionWidth.start();
           focusMotionHeight.start();
           super.setFocused(null);
       } else {
           super.setFocused(c);
       }
   }

   public void paint(Graphics g) {
       super.paint(g);
       if(futureFocus != null) {
           g.setColor(futureFocus.getStyle().getBgSelectionColor());
           g.fillRect(focusMotionX.getValue(), focusMotionY.getValue(),
                   focusMotionWidth.getValue(), focusMotionHeight.getValue(),
                   (byte)140);
       }
   }

   public boolean animate() {
       boolean val = super.animate();
       if(futureFocus != null && focusMotionX.isFinished()) {
           super.setFocused(futureFocus);
           futureFocus = null;
           focusMotionX = null;
           focusMotionY = null;
           focusMotionWidth = null;
           focusMotionHeight = null;
       }
       return val || futureFocus != null;
   }
}