How to stop a closing step

I want to trap the clicking on 'X' on the window and possibly prevent the window from closing. I have this code:

@Override
public void start (final stage) bird Exception {}
Mother-root = FXMLLoader.load (getClass () .getResource ("demo.fxml"));

Scene = new Scene (root);
stage.setScene (scene);
stage.setTitle ("Demo");
stage.setScene (scene);
stage.onCloseRequestProperty () .set (new EventHandler < WindowEvent > () {}
@Override
public void handle (WindowEvent e) {}
System.Err.println ("A");
}
});
stage.setOnCloseRequest (new EventHandler < WindowEvent > () {}
@Override
{} public void handle (WindowEvent ev)
System.Err.println ("B");
}
});

stage.onHidingProperty () .set (new EventHandler < WindowEvent > () {}
@Override
public void handle (WindowEvent e) {}
System.Err.println ("C");
}
});
stage.setOnHiding (new EventHandler < WindowEvent > () {}
@Override
{} public void handle (WindowEvent ev)
System.Err.println ("D");
}
});
}

@Override
public void stop() bird Exception {}
System.Err.println ("E");
Super.Stop ();
}

When you click the 'X' on the window, it prints

B
D
E

If I add an Event.consume (here):

stage.setOnCloseRequest (new EventHandler < WindowEvent > () {}
@Override
{} public void handle (WindowEvent ev)
System.Err.println ("B");
EV.consume)
}
});

and now, I get this:

B
The '< unknown >' program met with an X Window System error.
This probably reflects a bug in the program.
The error was 'GLXBadDrawable '.
(Details: series 113 error_code 149 136 minor_code request_code 5)
(Note to programmers: normally, X errors are reported asynchronously;)
in other words, you will receive the error a while after the cause.
To debug your program, run it with the - sync command line option
option to change this behavior. You can then get a significant
backtrace of your debugger if you break on the gdk_x_error() function).

I am running Java on Linux:

Java version "1.7.0_17".
Java (TM) SE Runtime Environment (build 1.7.0_17 - b02)
Java for 64-bit Server VM (build 23, 7 - b01, mixed mode)

When you click the 'X' on the window, it prints

B
D
E

This is the expected behavior.

If I add an Event.consume (here):

stage.setOnCloseRequest (new EventHandler() {}
@Override
{} public void handle (WindowEvent ev)
System.Err.println ("B");
EV.consume)
}
});

and that's the correct way to veto the request to close the scene...

>

and now, I get this:

B
The '' program met with an X Window System error.
This probably reflects a bug in the program.

But it is a bug. You must file a JIRA to do this. It's probably worth upgrading to the latest version of the JDK is available, both the stable release (JDK 1.7.0 u21) and also try with the latest snapshot of the JDK 8 (b88 currently); This will give you an idea as to if this problem has already been fixed.

FWIW, it works for me: I'm under JDK 1.7.0 u21 on Mac OS X; but this level of window events necessarily involves an interaction with the native windowing toolkit.

Tags: Java

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