Botão Animado em LWUIT – Ginga

Atendendo a pedidos, segue o código do componente para animação de botões para LWUIT – Ginga-J.

package org.gvlabs.sbtvd.ui;

import com.sun.dtv.lwuit.Button;
import com.sun.dtv.lwuit.Graphics;
import com.sun.dtv.lwuit.Image;

/**
 * Animated Button
 *
 * @author Thiago Galbiatti Vespa
 * @version 1.0
 */
public class AnimatedButton extends Button {
	private int speed = 50;

	private Image[] animaImgs;

	private int currentImage = 0;
	private long lastInvoke;
	private boolean forward = true;
	private boolean backAndForth = true;
	private boolean loop = true;
	private boolean disableLoop = false;

	/**
	 * Default constructor
	 */
	public AnimatedButton() {
	}

	/**
	 * Get array of images
	 * @return array of images
	 */
	public Image[] getAnimaImgs() {
		return animaImgs;
	}

	/**
	 * Set array of images to be animated
	 * @param animaImgs array of images
	 */
	public void setAnimaImgs(Image[] animaImgs) {
		this.animaImgs = animaImgs;
		if (animaImgs != null && animaImgs.length > 0) {
			this.setIcon(animaImgs[0]);
		}
	}

	/**
	 * Get animation speed is ms
	 * @return animation speed
	 */
	public int getSpeed() {
		return speed;
	}

	/**
	 * Set animation speed in ms
	 * @param speed animation speed
	 */
	public void setSpeed(int speed) {
		this.speed = speed;
	}

	/**
	 * Back and Forth animation
	 * @return true if is a back and forth animation
	 */
	public boolean isBackAndForth() {
		return backAndForth;
	}

	/**
	 * Set back and forth animation value
	 * @param backAndForth
	 */
	public void setBackAndForth(boolean backAndForth) {
		this.backAndForth = backAndForth;
	}

	/**
	 * Is loop?
	 * @return true if is a loop animation
	 */
	public boolean isLoop() {
		return loop;
	}

	/**
	 * true = loop, false = one animation
	 * @param loop
	 */
	public void setLoop(boolean loop) {
		this.loop = loop;
	}

	public boolean animate() {
		if (disableLoop)
			return false;
		long current = System.currentTimeMillis();
		if (current - lastInvoke > speed) {
			lastInvoke = current;
			if (forward) {
				currentImage++;
			} else {
				currentImage--;
			}
			if (currentImage >= animaImgs.length) {
				if (!loop) {
					disableLoop = true;
					return false;
				} else if (!backAndForth) {
					forward = true;
					currentImage = 0;
				} else {
					forward = false;
					currentImage = animaImgs.length - 1;
				}
			} else if (currentImage < 0) {
				forward = true;
				currentImage = 0;
			}
			return true;
		}
		return false;
	}

	/* (non-Javadoc)
	 * @see com.sun.dtv.lwuit.Button#paint(com.sun.dtv.lwuit.Graphics)
	 */
	public void paint(Graphics g) {
		g.drawImage(animaImgs[currentImage], getX(), getY());
	}

}

Para utilizar é só atribuir o conjunto de imagens para o método setAnimaImgs e registrar a animação no formulário, por exemplo: form.registerAnimation(animatedButton);