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Swing Chapter 15. (Advanced topics) Layered Panes and custom MDI. Easy for reading, Click here!

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Swing Chapter 15. (Advanced topics) Layered Panes and custom MDI. Easy for reading, Click here!

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Page: 2/7 

Previous Page Previous Page (1/7) - Next Page (3/7) Next Page
Subpages: 1. JLayeredPane 
Using JLayeredPane to enhance interfaces 
Creating a custom MDI: part I - Dragging panels 
4. Creating a custom MDI: part II - Resizability 
5. Creating a custom MDI: part III - Enhancements 
6. Creating a custom MDI: part IV - Selection and management 
7. Creating a custom MDI: part V - JavaBeans compliance 

15.2  Using JLayeredPane to enhance interfaces

As we mentioned early in chapter 4, JLayeredPane can sometimes come in handy when we want to manually position and size components. Because it's layout is null, it is not prone to the effects of resizing. Thus, when its parent is resized, a layered pane's children will stay in the same position and maintain the same size. (We saw a simple example of this in the beginning of chapter 6.) However, there are other ways to use JLayeredPane in typical interfaces. For instance, we can easily place a nice background image behind all of our components, giving life to an otherwise dull-looking panel.

Figure 15.3. The JLayeredPane standard layers

<<file figure15-3.gif>>

The Code: TestFrame.java

see \Chapter15\1

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class TestFrame extends JFrame


  public TestFrame() {

    super("JLayeredPane Demo");


    JPanel content = new JPanel();

    content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));


    JLabel label1 = new JLabel("Username:");



    JTextField field = new JTextField(15);


    JLabel label2 = new JLabel("Password:");



    JPasswordField fieldPass = new JPasswordField(15);


    getContentPane().setLayout(new FlowLayout());



    ImageIcon earth = new ImageIcon("earth.jpg");

    JLabel backlabel = new JLabel(earth);


      new Integer(Integer.MIN_VALUE));



    WindowListener l = new WindowAdapter() {

      public void windowClosing(WindowEvent e) {







  public static void main(String[] args) {

    new TestFrame();



Most of this code should look familiar. We extend JFrame and create a new JPanel with a y-oriented BoxLayout. We make this panel non-opaque so our background image will show through, then we add four simple components: two JLabels, a JTextField, and a JPasswordField. We then set the layout of the contentPane to FlowLayout (remember that the contentPane has a BorderLayout by default), and add our panel to it. We also set the contentPane's opaque property to false ensuring that our background will show through this panel as well. Finally we create a JLabel containing our background image, add it to our JFrame's layeredPane, and set its bounds based on the background image's size.

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