Changing borders on the fly
Here is a short program that creates four labels. Each label draws a bevel border around itself when the mouse pointer enters the component’s region and erases it when the mouse leaves the region. This kind of “rollover” effect has become a popular feature in some applications’ toolbars. Modifying the program to use soft bevel borders would be trivial.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class BevelExample extends JPanel {
BevelBorder bevel;
EmptyBorder empty;
JLabel label[] = new JLabel[4];
public BevelExample() {
super(true);
setLayout(new GridLayout(1, 4));
bevel = new BevelBorder(BevelBorder.RAISED);
empty = new EmptyBorder(5, 5, 5, 5);
label[0] = new JLabel("Home");
label[1] = new JLabel("Back");
label[2] = new JLabel("Forward");
label[3] = new JLabel("Stop");
for (int i = 0; i < label.length; i++) {
label[i].setHorizontalAlignment(JLabel.CENTER);
label[i].addMouseListener(new RolloverListener());
label[i].setBorder(empty);
add(label[i]);
}
}
public static void main(String s[]) {
JFrame frame = new JFrame("Bevel Border");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 100);
frame.setContentPane(new BevelExample());
frame.setVisible(true);
}
// Inner class to respond to mouse events for the "rollover" effect
class RolloverListener extends MouseAdapter {
public void mouseEntered(MouseEvent e) {
((JLabel) e.getComponent()).setBorder(bevel);
repaint();
}
public void mouseExited(MouseEvent e) {
((JLabel) e.getComponent()).setBorder(empty);
repaint();
}
public void mouseClicked(MouseEvent e) {
String text = ((JLabel) e.getComponent()).getText();
System.out.println("You clicked " + text + "!");
}
}
}
