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2 Replies Latest reply: Aug 29, 2012 1:09 PM by 955780 RSS

JDesktopPane Trials

955780 Newbie
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well, im trying to learn how to use the JDesktopPane and i found some examples on the web, and i cant get it to work "properly"

This example is just a menu with an item menu that adds an internal frame, the internal frame adds a Textfield to itself and here is the part that i don't understand, for some reason the textfield isnt visible.

If i run debug, i can notice in a GUI snapshot that the frame is actually being created but i cant see it. here is the code.



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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package src;

/**
 *
 * @author pato
 */

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;

public class Main extends JFrame {
  public Main() {
    JMenuBar bar = new JMenuBar();
    JMenu addMenu;
        addMenu = new JMenu("Add");
    JMenuItem newFrame;
        newFrame = new JMenuItem("Internal Frame");
    addMenu.add(newFrame);
    bar.add(addMenu);
    setJMenuBar(bar);

    final JDesktopPane theDesktop = new JDesktopPane();
    getContentPane().add(theDesktop);

    newFrame.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        JInternalFrame frame;
            frame = new JInternalFrame("Internal Frame", true, true, true, true);

        Container c = frame.getContentPane();
        MyJPanel panel = new MyJPanel();

        c.add(panel, BorderLayout.CENTER);
        frame.setSize(200,200);
        frame.setOpaque(true);
       
        theDesktop.add(frame);
      }
    });

    setSize(500, 400);
    setVisible(true);
  }

  public static void main(String args[]) {
    Main app = new Main();
  }
}

class MyJPanel extends JPanel {
  public MyJPanel() {
    JTextField label=new JTextField("Hello World");
    label.setEditable(true);
    label.setBackground(Color.CYAN); //this is the same as a JLabel
    add(label);
  
  }

}
THX in advance

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