bevelexample.java

java swing 开发代码

//  BevelExample.java
// An example of borders with a BevelBorder used on JLabels as a highlight
// as the mouse rolls over them.
//
package	jswing.ch13;

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 + "!");
        }
    }
}