Re: Listener for opening

  To: comp.lang.java.gui
Volker Raum <Volker.Raum@heitec.de> wrote in
news:g5k5mq$o58$1@murphy.mediascape.de:


Hi Volker,

You need to add an AWTEventListener to the default Toolkit.

Please see an example below.

Hope this helps.

Piet

import java.awt.AWTEvent;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class WindowMonitor {

    public static void main(String[] args) {
    registerGeneralWindowListener();
    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
        for (int index = 0; index < 3; index++) {
            createWindow(index);
        }
        }

        private void createWindow(int number) {
        JFrame frame = new JFrame(String.valueOf(number));
        frame.setName(String.valueOf(number));
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.setSize(200, 200);
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
        }
    });
    }

    private static void registerGeneralWindowListener() {
    AWTEventListener listener = new AWTEventListener() {

        @Override
        public void eventDispatched(AWTEvent event) {
        if (event instanceof WindowEvent) {
            WindowEvent windowEvent = (WindowEvent) event;
            System.out.println(windowEvent.getWindow().getName()
                + " event type "
                + getDescription(windowEvent.getID()));
        }
        }

        private String getDescription(int eventID) {
        switch (eventID) {
        case WindowEvent.WINDOW_ACTIVATED:
            return "activated";
        case WindowEvent.WINDOW_CLOSED:
            return "closed";
        case WindowEvent.WINDOW_CLOSING:
            return "closing";
        case WindowEvent.WINDOW_DEACTIVATED:
            return "deactivated";
        case WindowEvent.WINDOW_DEICONIFIED:
            return "deiconified";
        case WindowEvent.WINDOW_GAINED_FOCUS:
            return "gained focus";
        case WindowEvent.WINDOW_ICONIFIED:
            return "iconified";
        case WindowEvent.WINDOW_LOST_FOCUS:
            return "lost focus";
        case WindowEvent.WINDOW_OPENED:
            return "opened";

        default:
            return "undefined";
        }

        }
    };
    Toolkit.getDefaultToolkit().addAWTEventListener(listener,
        AWTEvent.WINDOW_EVENT_MASK);
    }

}

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