InternalFrame.setNorthPane(null) and JDesktopPane outline drag mode

Question

package components;
import javax.swing.JDesktopPane;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.JFrame;
import javax.swing.KeyStroke;
import java.awt.event.*;
import java.awt.*;
import javax.swing.plaf.basic.BasicInternalFrameUI;
* InternalFrameDemo.java requires:
*   MyInternalFrame.java
public class InternalFrameDemo extends JFrame
                               implements ActionListener {
    JDesktopPane desktop;
    Point mouseCoord, windowCoord = new Point();
    public InternalFrameDemo() {
        super("InternalFrameDemo");
        //Make the big window be indented 50 pixels from each edge
        //of the screen.
        int inset = 50;
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setBounds(inset, inset,
                  screenSize.width  - inset*2,
                  screenSize.height - inset*2);
        //Set up the GUI.
        desktop = new JDesktopPane(); //a specialized layered pane
        createFrame(); //create first "window"
        setContentPane(desktop);
        setJMenuBar(createMenuBar());
        //Make dragging a little faster but perhaps uglier.
        desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
    protected JMenuBar createMenuBar() {
        JMenuBar menuBar = new JMenuBar();
        //Set up the lone menu.
        JMenu menu = new JMenu("Document");
        menu.setMnemonic(KeyEvent.VK_D);
        menuBar.add(menu);
        //Set up the first menu item.
        JMenuItem menuItem = new JMenuItem("New");
        menuItem.setMnemonic(KeyEvent.VK_N);
        menuItem.setAccelerator(KeyStroke.getKeyStroke(
                KeyEvent.VK_N, ActionEvent.ALT_MASK));
        menuItem.setActionCommand("new");
        menuItem.addActionListener(this);
        menu.add(menuItem);
        //Set up the second menu item.
        menuItem = new JMenuItem("Quit");
        menuItem.setMnemonic(KeyEvent.VK_Q);
        menuItem.setAccelerator(KeyStroke.getKeyStroke(
                KeyEvent.VK_Q, ActionEvent.ALT_MASK));
        menuItem.setActionCommand("quit");
        menuItem.addActionListener(this);
        menu.add(menuItem);
        return menuBar;
    //React to menu selections.
    public void actionPerformed(ActionEvent e) {
        if ("new".equals(e.getActionCommand())) { //new
            createFrame();
        } else { //quit
            quit();
    //Create a new internal frame.
    protected void createFrame() {
        final MyInternalFrame frame = new MyInternalFrame();
        ((BasicInternalFrameUI) frame.getUI()).setNorthPane(null);   
        frame.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));   
        frame.addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseDragged(MouseEvent e) {  
                isMouse2Move(frame, e);               
        frame.addMouseListener(new MouseAdapter() {          
            public void mousePressed(MouseEvent e) {                                                 
                setWindowDragPoint(e);              
        frame.setVisible(true); //necessary as of 1.3
        desktop.add(frame);
        try {
            frame.setSelected(true);
        } catch (java.beans.PropertyVetoException e) {}
    private void isMouse2Move(Component frame, MouseEvent e) {
        int cur_type = frame.getCursor().getType();   
        if (cur_type >= Cursor.DEFAULT_CURSOR) {
            if (cur_type == Cursor.MOVE_CURSOR) {
                moveWindow(frame, e);                       
    private void moveWindow(Component frame, MouseEvent e) {
        int deltaX, deltaY;
        Point newMouseCoord = e.getPoint();
        deltaX = (int) (newMouseCoord.getX() - mouseCoord.getX());
        deltaY = (int) (newMouseCoord.getY() - mouseCoord.getY());
        frame.getLocation(windowCoord);
        windowCoord.translate(deltaX, deltaY);
        frame.setLocation(windowCoord);
    private void setWindowDragPoint(MouseEvent e) {
        mouseCoord = e.getPoint();
    //Quit the application.
    protected void quit() {
        System.exit(0);
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);
        //Create and set up the window.
        InternalFrameDemo frame = new InternalFrameDemo();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Display the window.
        frame.setVisible(true);
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
package components;
import javax.swing.JInternalFrame;
import java.awt.event.*;
import java.awt.*;
/* Used by InternalFrameDemo.java. */
public class MyInternalFrame extends JInternalFrame {
    static int openFrameCount = 0;
    static final int xOffset = 30, yOffset = 30;
    public MyInternalFrame() {
        super("Document #" + (++openFrameCount),
              true, //resizable
              true, //closable
              true, //maximizable
              true);//iconifiable
        //...Create the GUI and put it in the window...
        //...Then set the window size or call pack...
        setSize(300,300);
        //Set the window's location.
        setLocation(xOffset*openFrameCount, yOffset*openFrameCount);
}how to move frame (JDesktopPane) <desktop> can not enable drag outline mode..
help me please!
thank you.

Answer 1

yes i want all the decorations.Then I have no idea what you are tying to do. Why are you getting rid of the title bar?
Dragging is supported automatically by clicking on and then dragging the title bar. If you want to customize the behaviour then you would need to look at the UI. Good luck.