Examples of org.eclipse.swt.widgets.Display.addFilter()

org.eclipse.swt.widgets.Display.addFilter()
Adds the listener to the collection of listeners who will be notified when an event of the given type occurs anywhere in a widget. The event type is one of the event constants defined in class SWT. When the event does occur, the listener is notified by sending it the handleEvent() message.
Setting the type of an event to SWT.None from within the handleEvent() method can be used to change the event type and stop subsequent Java listeners from running. Because event filters run before other listeners, event filters can both block other listeners and set arbitrary fields within an event. For this reason, event filters are both powerful and dangerous. They should generally be avoided for performance, debugging and code maintenance reasons.
@param eventType the type of event to listen for @param listener the listener which should be notified when the event occurs @exception IllegalArgumentException
- ERROR_NULL_ARGUMENT - if the listener is null
@exception SWTException
- ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
- ERROR_DEVICE_DISPOSED - if the receiver has been disposed
@see Listener @see SWT @see #removeFilter @see #removeListener @since 3.0

      Shell shell = getShell ();
      shell.removeListener (SWT.Deactivate, listener);
      shell.addListener (SWT.Deactivate, listener);
      Display display = getDisplay ();
      display.removeFilter (SWT.FocusIn, filter);
      display.addFilter (SWT.FocusIn, filter);
      Event e = new Event ();
      notifyListeners (SWT.FocusIn, e);
      break;
    }
    case SWT.FocusOut: {

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        display.removeFilter(SWT.FocusIn, filter);
        if ( focusIndex < 0 ) {
          setFocus(NOFOCUS);
        }
        notifyListeners(SWT.FocusIn, new Event());
        display.addFilter(SWT.FocusIn, filter);
        display.addFilter(SWT.KeyDown, filter);
        break;
      case SWT.FocusOut :
        if ( ! hasFocus ) return;
        Control focusControl = getDisplay().getFocusControl();

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        if ( focusIndex < 0 ) {
          setFocus(NOFOCUS);
        }
        notifyListeners(SWT.FocusIn, new Event());
        display.addFilter(SWT.FocusIn, filter);
        display.addFilter(SWT.KeyDown, filter);
        break;
      case SWT.FocusOut :
        if ( ! hasFocus ) return;
        Control focusControl = getDisplay().getFocusControl();
        if ( focusControl == CCalendar.this

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        shell.removeListener(SWT.Deactivate, listener);
        shell.addListener(SWT.Deactivate, listener);
        Display display = getDisplay();
        display.removeFilter(SWT.FocusIn, filter);
        notifyListeners(SWT.FocusIn, new Event());
        display.addFilter(SWT.FocusIn, filter);
        break;
      }
      case SWT.FocusOut : {
        if ( ! hasFocus ) return;
        Control focusControl = getDisplay().getFocusControl();

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            Shell shell = getShell();
            shell.removeListener(SWT.Deactivate, listener);
            shell.addListener(SWT.Deactivate, listener);
            Display display = getDisplay();
            display.removeFilter(SWT.FocusIn, filter);
            display.addFilter(SWT.FocusIn, filter);
            Event e = new Event();
            notifyListeners(SWT.FocusIn, e);
            break;
        }
        case SWT.FocusOut: {

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        event.doit = false;
        event.type = SWT.NONE;
      }
    };
    for (int i = 0; i < events.length; i++) {
      display.addFilter(events[i], listener);
    }
    return new Runnable() {
      public void run() {
        for (int i = 0; i < events.length; i++) {
          display.removeFilter(events[i], listener);

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    addListener(SWT.Dispose, new Listener() {
      public void handleEvent(Event event) {
        display.removeFilter(SWT.MouseWheel, wheelListener);
      }
    });
    display.addFilter(SWT.MouseWheel, wheelListener);
  }


  ////////////////////////////////////////////////////////////////////////////
  //
  // Keyboard navigation

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      Shell shell = getShell ();
      shell.removeListener (SWT.Deactivate, listener);
      shell.addListener (SWT.Deactivate, listener);
      Display display = getDisplay ();
      display.removeFilter (SWT.FocusIn, filter);
      display.addFilter (SWT.FocusIn, filter);
      Event e = new Event ();
      notifyListeners (SWT.FocusIn, e);
      break;
    }
    case SWT.FocusOut: {

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                Shell shell = getShell();
                shell.removeListener(SWT.Deactivate, listener);
                shell.addListener(SWT.Deactivate, listener);
                Display display = getDisplay();
                display.removeFilter(SWT.FocusIn, focusFilter);
                display.addFilter(SWT.FocusIn, focusFilter);
                Event e = new Event();
                notifyListeners(SWT.FocusIn, e);
                break;
            }
            case SWT.FocusOut: {

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            }
        };
        
        final Display display = this.table.getDisplay();
        
        display.addFilter( SWT.KeyDown, keyListener );
        display.addFilter( SWT.KeyUp, keyListener );
        
        this.table.addListener
        (
            SWT.EraseItem,

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