Stopping an InternalFrame from closing

[Tad Dicks]

I have an internalFrameListener, and on the "internalFrameClosing" method/event, I want to popup a save window with (y/n/cancel), easy enough. My problem is if they hit cancel I want the window to not close. Is there a way to stop it from closing?

-Tad

[Gregg Bolinger]

You need to do the following, depending on how you are creating your internal frame you'll need to change whatever necessary...

public class MyInternalFrame extends JInternalFrame implements.... {
 
   public MyInternalFrame() {
 
      setDefaultCloseOperation(JInternalFrame.DO_NOTHING_ON_CLOSE);
      .....
   }
}

Then in your method you described, if no or cancel is selected, just don't do anything. If you want the frame to close you'll have to do that manually using the dispose() method.

[Tad Dicks]

Ok... but how do I listen for the close operation of the internal frame then? it seems to just disable the [x] button on the internal frame.

-Tad

[Tad Dicks]

nm... guess I need to register the internalframe with the listener doh.

[Gregg Bolinger]

When you tell it DO_NOTHING_ON_CLOSE a close event is still fired. The frame just won't do anything because of it. So in your internalFrameClosing method you would need to either call the dispose() method or do nothing.

[Gregg Bolinger]

Maybe this will help. Excuse the bad coding practices.

public class DesktopTest extends JFrame {
 
    public DesktopTest(){
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JDesktopPane desktop = new JDesktopPane();
        desktop.setLayout(null);
        setContentPane(desktop);
 
        MyInternalFrame inf = new MyInternalFrame();
 
        inf.setBounds(5, 5, 100, 100);
        desktop.add(inf);
        inf.setVisible(true);
        setSize(400, 400);
        setLocationRelativeTo(this);
    }
 
    public static void main(String[] args) {
        new DesktopTest().setVisible(true);
    }
 
    public class MyInternalFrame extends JInternalFrame implements InternalFrameListener {
 
        public MyInternalFrame(){
            super("Frame", true, true, true, true);
            setDefaultCloseOperation(JInternalFrame.DO_NOTHING_ON_CLOSE);
 
            this.addInternalFrameListener(this);
 
        }
 

        public void internalFrameOpened(InternalFrameEvent event) {
            //To change body of implemented methods use File | Settings | File Templates.
        }
 
        public void internalFrameClosing(InternalFrameEvent event) {
            int option = JOptionPane.showConfirmDialog(DesktopTest.this, "Really Close", "Exit", JOptionPane.YES_NO_OPTION);
            if (option == JOptionPane.YES_OPTION){
                dispose();
            }
        }
 
        public void internalFrameClosed(InternalFrameEvent event) {
            //To change body of implemented methods use File | Settings | File Templates.
        }
 
        public void internalFrameIconified(InternalFrameEvent event) {
            //To change body of implemented methods use File | Settings | File Templates.
        }
 
        public void internalFrameDeiconified(InternalFrameEvent event) {
            //To change body of implemented methods use File | Settings | File Templates.
        }
 
        public void internalFrameActivated(InternalFrameEvent event) {
            //To change body of implemented methods use File | Settings | File Templates.
        }
 
        public void internalFrameDeactivated(InternalFrameEvent event) {
            //To change body of implemented methods use File | Settings | File Templates.
        }
    }
}