Re: Button Animation

"John B. Matthews" <nospam@nospam.invalid>
Sat, 31 Jul 2010 09:26:00 -0400
In article
 Dancing Fingers <> wrote:

Does anyone know if there's an easy way to animate button that move
over time? I'm thinking: about using LayoutManager, creating mock
buttons, emptying LayoutManager, animating the mock buttons, using
LayoutManager again and deleting the mock buttons. This seems like a
lot of work to get from point A to Point B? Any advice would be

You can use a layout manager to establish the initial geometry and then
do setBounds() to move the button(s). Try resizing the window in the
example below both with and without a subsequent null layout.

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

/** @author John B. Matthews */
public class ButtonTest extends JPanel implements ActionListener {

    private static final Random rnd = new Random();
    private final Timer timer = new Timer(500, this);
    private final List<JButton> buttons = new ArrayList<JButton>();

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            public void run() {
                new ButtonTest().create();

    private void create() {
        JFrame f = new JFrame("ButtonTest");

    public ButtonTest() {
        super(new GridLayout(5, 2));
        this.setPreferredSize(new Dimension(640, 480));
        for (int i = 0; i < 10; i++) {
            JButton b = new JButton(String.valueOf(i));

    public void actionPerformed(ActionEvent e) {
        for (JButton b : buttons) {
            Rectangle r = b.getBounds();
                rnd.nextInt(getWidth() - r.width),
                rnd.nextInt(getHeight() - r.height),
                r.width, r.height);

John B. Matthews
trashgod at gmail dot com

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