Examples of org.zkoss.zk.ui.Desktop.addListener()

org.zkoss.zk.ui.Desktop.addListener()

Adds a listener.

Note: if the listener is added twice, it will be invoked twice when a corresponding event occurs. @param listener the listener. It cannot be null.It must be an instance that implements {@link org.zkoss.zk.ui.util.DesktopCleanup}, {@link org.zkoss.zk.ui.util.ExecutionInit}, {@link org.zkoss.zk.ui.util.ExecutionCleanup}, {@link org.zkoss.zk.ui.util.UiLifeCycle}, {@link org.zkoss.zk.ui.util.EventInterceptor}and/or {@link org.zkoss.zk.au.AuService}.
Note: {@link org.zkoss.zk.ui.util.DesktopInit}, {@link org.zkoss.zk.ui.event.EventThreadInit}, {@link org.zkoss.zk.ui.event.EventThreadCleanup}, {@link org.zkoss.zk.ui.event.EventThreadSuspend} and{@link org.zkoss.zk.ui.event.EventThreadResume} are not supported. @exception IllegalArgumentException if not a valid listener. @since 3.0.6

    final Desktop desktop = exec.getDesktop();
    synchronized (_dts) {
      boolean startRequired = false;
      DesktopThread dtthd = (DesktopThread)_dts.get(desktop);
      if (dtthd == null) {
        desktop.addListener(new EQCleanup());
          //OK to call addListener since it is the current desktop
        _dts.put(desktop, dtthd = new DesktopThread(desktop));
        startRequired = true;
      }

      dtthd.subscribe(listener, callback, async);


      if (startRequired) {
        if (!desktop.isServerPushEnabled()) {
          dtthd.enableCurrentServerPush();
          desktop.addListener(new EQService(dtthd));
            //add here since desktop is the current desktop
        }
        dtthd.start();
      }
    }

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