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How to implement buttons at different layers |
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This Java Swing tip illustrates a method of implementing buttons in different
layers. Layers are implemented using the JLayeredPane class in the application.
A layered pane is a Swing container that provides a third dimension for positioning components: depth, also known as Z order.
import javax.swing.*;
import java.awt.Color;
public class SimpleLayers extends JFrame {
public SimpleLayers() {
super("LayeredPane Demonstration");
setSize(200, 150);
setDefaultCloseOperation(EXIT_ON_CLOSE);
JLayeredPane lp = getLayeredPane();
// Create 3 buttons
JButton top = new JButton();
top.setBackground(Color.white);
top.setBounds(20, 20, 50, 50);
JButton middle = new JButton();
middle.setBackground(Color.gray);
middle.setBounds(40, 40, 50, 50);
JButton bottom = new JButton();
bottom.setBackground(Color.black);
bottom.setBounds(60, 60, 50, 50);
// Place the buttons in different layers
lp.add(middle, new Integer(2));
lp.add(top, new Integer(3));
lp.add(bottom, new Integer(1));
}
public static void main(String[] args) {
SimpleLayers sl = new SimpleLayers();
sl.setVisible(true);
}
}
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