在JButton上动画GIF，当鼠标悬停时播放它

Question

Icon icon = new ImageIcon(getClass().getResource( "/img/icon.gif" ) );
aButton = new JButton("Its a button", icon);

Is there some kind of method that can stop an animated from playing? I was thinking of assigning a static jpg of the gif, then when I hover, assign the animated gif, but I don't think there is an event for taking off mouse in MouseMotionListener so I can load back the static jpg.

The gif loops in the button, however, if I hover over it, it disappears.

How can I make the gif static if my mouse cursor is not on the button?

If I use MouseMotionListener , does it fire an event if I take off my mouse?

@Override
public void mouseMoved(MouseEvent e) {
//play the gif
//if I take mouse off, call some method to stop playing animated gif
}

@Override
public void mouseDragged(MouseEvent e) {
}

Answer 1

See:

• setIcon(Icon)
• setDisabledIcon(Icon)
• setPressedIcon(Icon)
• setRolloverIcon(Icon)
• setSelectedIcon(Icon)

No need for setting an explicit mouse listener, the changeover happens automatically.

EG In this example I did not add a MediaTracker so popped the image into a label to allow for load time. The end user is the ImageObserver (wait till you see it spin before dismissing the first dialog).

import java.awt.*;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.swing.*;

public class ImageSwapOnButton {

    public static void main( String[] args ) throws Exception {
        URL url = new URL("http://1point1c.org/gif/thum/plnttm.gif");

        Image image = Toolkit.getDefaultToolkit().createImage(url);
        ImageIcon spinIcon = new ImageIcon(image);
        JOptionPane.showMessageDialog(null, new JLabel(spinIcon));

        // create a static version of this icon
        BufferedImage bi = new BufferedImage(150,150,BufferedImage.TYPE_INT_ARGB);
        Graphics g = bi.getGraphics();
        g.drawImage(image,0,0,null);
        g.dispose();
        ImageIcon staticIcon = new ImageIcon(bi);

        JButton button = new JButton(staticIcon);
        button.setRolloverIcon(spinIcon);
        JOptionPane.showMessageDialog(null, button);
    }
}

Also, don't make the static image as JPEG. A JPEG is lossy and does not support transparency. Either use a single frame GIF or a PNG.

Answer 2

button.setIcon(new ImageIcon("/*icon location*/"));
button.setRolloverIcon(new ImageIcon("/*icon location*/"

The Animated gif image will not get invisible when mouse pointer moves over the button.