Question

Edited with a SSCCE and a workaround

I want to programmatically change the location of a JDialog.

public class SSCCE {
  public static void main(String[] pArgs) {
    JDialog dialog = new JDialog();
    dialog.setSize(300, 300);
    dialog.setLocation(10, 10);
    dialog.setVisible(true);
  }
}

However, this is not working, the new dialog is always located in the center of the screen. I suspect it has something todo with my L&F (Windows 7 64bit, jdk 1.6_30), when setting the dialog to be undecorated,

public class SSCCEWorksButUndecorated {
  public static void main(String[] pArgs) {
    JDialog dialog = new JDialog();
    dialog.setSize(300, 300);
    dialog.setLocation(10, 10);
    dialog.setUndecorated(true);
    dialog.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);
    dialog.setVisible(true);
  }
}

The location is excalty where I specified.

But I need a decorated dialog, has anyone else seen this problem before or am I missing something?

Workaround by settings location after setVisible() for modal dialogs

public class SSCCEWorkaroundForModalDialogs {
  public static void main(String[] pArgs) {
    final JDialog dialog = new JDialog();
    dialog.setSize(300, 300);
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        dialog.setLocation(10, 10);
      }
     });        
     dialog.setVisible(true);
  }
}

Answer 1

The move method documentation says:

This method changes layout-related information, and therefore,
invalidates the component hierarchy.

The method changes the geometry-related data. Therefore, the native
windowing system may ignore such requests, or it may modify the
requested data, so that the Window object is placed and sized in a way
that corresponds closely to the desktop settings.

I assume you can do a call to revalidaite() before setting the dialog visible again.