Java Tutorial/SWT/Shell Event

Add Close event for Shell window

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class ShellWindowCloseEvent {
  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.addListener(SWT.Close, new Listener() {
      public void handleEvent(Event event) {
        System.out.println("cose");
      }
    });
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Change the default behavior of shells

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ShellEvent;
import org.eclipse.swt.events.ShellListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;
public class ShellBehaviourDefault {
  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display, SWT.SHELL_TRIM);
    shell.setLayout(new FillLayout());
    shell.addShellListener(new ShellListener() {
      public void shellActivated(ShellEvent event) {
      }
      public void shellClosed(ShellEvent event) {
        MessageBox messageBox = new MessageBox(shell, SWT.APPLICATION_MODAL | SWT.YES | SWT.NO);
        messageBox.setText("Warning");
        messageBox.setMessage("You have unsaved data. Close the shell anyway?");
        if (messageBox.open() == SWT.YES)
          event.doit = true;
        else
          event.doit = false;
      }
      public void shellDeactivated(ShellEvent arg0) {
      }
      public void shellDeiconified(ShellEvent arg0) {
      }
      public void shellIconified(ShellEvent arg0) {
      }
    });
    shell.open();
    // Set up the event loop.
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        // If no more entries in event queue
        display.sleep();
      }
    }
    display.dispose();
  }
}

Shell Events

Shells can generate a unique type of event: shell events (ShellEvent). A shell event is generated when a shell is minimized, maximized, activated, deactivated, or closed.

To add a shell listener to a shell, use this method:

public void addShellListener(ShellListener listener)