Java Tutorial/SWT/Shell Event

Add Close event for Shell window

   <source lang="java">

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();
 }

}</source>

Change the default behavior of shells

   <source lang="java">

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();
 }

}</source>

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:

   <source lang="java">

public void addShellListener(ShellListener listener)</source>