Make JInternal Frame non-moveable

Question

I am making an apllication in java swing for practice by using drag and drop components , i am facing a problem, i put inside the JPanel, an JInternal Frame

, it is moveable,

i want to make it un-moveable

,which event is used for it? How can i do it ? i search on the internet but unfortunately unable to find the solution for this.

I have found this on internet but i want to do it with the help of event option in swing.

     // Make first internal frame unmovable

JInternalFrame[] frames = frame.desktop.getAllFrames();
JInternalFrame f = frames[0];
BasicInternalFrameUI ui = (BasicInternalFrameUI)f.getUI();

Component north = ui.getNorthPane();
MouseMotionListener[] actions =        // there is no option for MouseMotionListener in the event option
(MouseMotionListener[])north.getListeners(MouseMotionListener.class);

for (int i = 0; i < actions.length; i++)
north.removeMouseMotionListener( actions[i] );

Answer 1

DesktopManager is resposible for all operation with internal frames. So you can redefine it using the proxy pattern to make some of your frames non-movable. Here is non-complete example for you (sorry I havn't tested this code, so I'm not sure whether it works).

private static class ProxyDesktopManager implements DesktopManager {

    private final DesktopManager delegate;

    public ProxyDesktopManager(DesktopManager delegate) {
        this.delegate = Objects.requireNonNull(delegate);
    }

    // Check whether frame is moveable
    private boolean checkFrameMovable(JComponent frame) {
        if (frame instanceof JInternalFrame) {
            // TODO check whether the frame if movable

        }
        return false;
    }

    @Override
    public void beginDraggingFrame(JComponent f) {
        if (checkFrameMovable(f)) {
            delegate.beginDraggingFrame(f);
        }
    }

    @Override
    public void dragFrame(JComponent f, int newX, int newY) {
        if (checkFrameMovable(f)) {
            delegate.dragFrame(f, newX, newY);
        }
    }

    @Override
    public void endDraggingFrame(JComponent f) {
        if (checkFrameMovable(f)) {
            delegate.endDraggingFrame(f);
        }
    }

    @Override
    public void openFrame(JInternalFrame f) {
        delegate.openFrame(f);
    }

    @Override
    public void closeFrame(JInternalFrame f) {
        delegate.closeFrame(f);
    }

    @Override
    public void maximizeFrame(JInternalFrame f) {
        delegate.maximizeFrame(f);
    }

    @Override
    public void resizeFrame(JComponent f, int newX, int newY, int newWidth, int newHeight) {
        delegate.resizeFrame(f, newX, newY, newWidth, newHeight);
    }

    // IMPORTANT: simply delegate all another methods like openFrame or 
    // resizeFrame
}

Now you can use this proxy class for your JDesktopPane

JDesktopPane desktop = new JDesktopPane();
desktop.setDesktopManager(new ProxyDesktopManager(desktop.getDesktopManager()));