import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import javax.swing.JFrame;
// @author Santhosh Kumar T - santhosh@in.fiorano.com
public class ModalFrameUtil {
static class EventPump implements InvocationHandler {
Frame frame;
public EventPump(Frame frame) {
this.frame = frame;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
return frame.isShowing();
}
// when the reflection calls in this method has to be
// replaced once Sun provides a public API to pump events.
public void start() throws Exception {
Class clazz = Class.forName("java.awt.Conditional");
Object conditional = Proxy.newProxyInstance(clazz.getClassLoader(), new Class[] { clazz },
this);
Method pumpMethod = Class.forName("java.awt.EventDispatchThread").getDeclaredMethod(
"pumpEvents", new Class[] { clazz });
pumpMethod.setAccessible(true);
pumpMethod.invoke(Thread.currentThread(), new Object[] { conditional });
}
}
// show the given frame as modal to the specified owner.
// NOTE: this method returns only after the modal frame is closed.
public static void showAsModal(final Frame frame, final Frame owner) {
frame.addWindowListener(new WindowAdapter() {
public void windowOpened(WindowEvent e) {
owner.setEnabled(false);
}
public void windowClosing(WindowEvent e) {
owner.setEnabled(true);
frame.removeWindowListener(this);
}
public void windowClosed(WindowEvent e) {
owner.setEnabled(true);
frame.removeWindowListener(this);
}
});
owner.addWindowListener(new WindowAdapter() {
public void windowActivated(WindowEvent e) {
if (frame.isShowing()) {
frame.setExtendedState(JFrame.NORMAL);
frame.toFront();
} else {
owner.removeWindowListener(this);
}
}
});
frame.setVisible(true);
try {
new EventPump(frame).start();
} catch (Throwable throwable) {
throw new RuntimeException(throwable);
}
}
}