Examples of org.zkoss.zk.ui.event.EventListener

org.zkoss.zk.ui.event.EventListener
An listener that will be notified when an event occurs, if it is registered to {@link org.zkoss.zk.ui.Component#addEventListener}.
If an event listener also implements {@link Deferrable}and {@link Deferrable#isDeferrable} returns true, the eventfor the listener will NOT be sent to the server immediately (when it is fired at the client). It is called the deferrable event listener. It helps to improve the performance since the deferred events will be 'packed' together and sent to the server at once. It is usully used for event listeners that maintains the application states, rather than generating visual responses.
By default (i.e., if {@link Deferrable} is not implemented), the eventlistener is not deferrable. It is also called the ASAP event listener.
If an event listener also implements {@link Express}, the event listener is evaluated before all other listeners, including the onXxx members declared in the ZUML page.
By default (i.e., if {@link Express} is not implemented,the event listener is eveluated after the onXxx members declared in the ZUML page, but before the onXxx methods declared in the component class. @author tomyeh @see Deferrable @see Express

    @SuppressWarnings("unchecked")
    private void createPortlet(Map params)
    {
        final Panel topoPanel = (Panel)execution.createComponents("/topoPortlet.zul", null, params);
       
        topoPanel.addEventListener("onClose", new EventListener()
        {
            @Override
            public void onEvent(Event arg0) throws Exception
            {
                portletKeySet.remove(topoPanel.getAttribute("portletKey"));

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    @SuppressWarnings("unchecked")
    private void createPortlet2(Map params)
    {
        final Panel topoPanel = (Panel)execution.createComponents("/topoPortlet.zul", null, params);
       
        topoPanel.addEventListener("onClose", new EventListener()
        {
            @Override
            public void onEvent(Event arg0) throws Exception
            {
                portletKeySet.remove(topoPanel.getAttribute("portletKey"));

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            return;
        }


    //other url, assume login fail
    if (!comp.isListenerAvailable(ZkAuthenticationEntryPoint.ON_ACEGILOGIN, true)) {
      final EventListener listener = new ShowWindowEventListener();
      comp.setAttribute(ZkAuthenticationEntryPoint.ON_ACEGILOGIN, listener);
      comp.addEventListener(ZkAuthenticationEntryPoint.ON_ACEGILOGIN, listener);
    }
    
      Events.postEvent(new Event(ZkAuthenticationEntryPoint.ON_ACEGILOGIN, comp, url));

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        ((HttpServletRequest) request).setAttribute(AccessDeniedHandlerImpl.ACEGI_SECURITY_ACCESS_DENIED_EXCEPTION_KEY,
            accessDeniedException);


      final Component comp = (Component) request.getAttribute(ZkEventExceptionFilter.COMPONENT);
    if (!comp.isListenerAvailable(ON_ACCESSDENIED, true)) {
      final EventListener listener = new ShowWindowEventListener();
      comp.setAttribute(ON_ACCESSDENIED, listener);
      comp.addEventListener(ON_ACCESSDENIED, listener);
    }
    final String url = getErrorPage();
      Events.postEvent(new Event(ON_ACCESSDENIED, comp, url != null ? url : "~./accessDenied.zul"));

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    final Execution exec = Executions.getCurrent();
    try {
      doModal(page, url);
      } finally {
      if (comp.isListenerAvailable(event.getName(), true)) {
        EventListener listener = (EventListener) comp.getAttribute(event.getName());
        if (listener != null) {
          comp.removeEventListener(event.getName(), listener);
          comp.removeAttribute(event.getName());
        }
      }

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    final Execution exec = Executions.getCurrent();
    try {
      doModal(page, url);
      } finally {
      if (comp.isListenerAvailable(event.getName(), true)) {
        EventListener listener = (EventListener) comp.getAttribute(event.getName());
        if (listener != null) {
          comp.removeEventListener(event.getName(), listener);
          comp.removeAttribute(event.getName());
        }
      }

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    final String evtnm = _event.getName();
    final Set listenerCalled = new HashSet();
      //OK to use Set since the same listener cannot be added twice
    boolean retry = false;
    for (Iterator it = _comp.getListenerIterator(evtnm);;) {
      final EventListener el = nextListener(it);
      if (el == null) {
        break; //done


      } else if (el == RETRY) {
        retry = true;
        it = _comp.getListenerIterator(evtnm);


      } else if ((el instanceof Express)
      && (!retry || !listenerCalled.contains(el))) {
        listenerCalled.add(el);


        el.onEvent(_event);
        if (!_event.isPropagatable())
          return; //done
      }
    }


    final ZScript zscript = ((ComponentCtrl)_comp).getEventHandler(evtnm);
    if (zscript != null && page != null) {
      page.interpret(
        zscript.getLanguage(), zscript.getContent(page, _comp), scope);
      if (!_event.isPropagatable())
        return; //done
    }


    retry = false;
    listenerCalled.clear();
    for (Iterator it = _comp.getListenerIterator(evtnm);;) {
      final EventListener el = nextListener(it);
      if (el == null) {
        break; //done


      } else if (el == RETRY) {
        retry = true;
        it = _comp.getListenerIterator(evtnm);


      } else if (!(el instanceof Express)
      && (!retry || !listenerCalled.contains(el))) {
        listenerCalled.add(el);


        el.onEvent(_event);
        if (!_event.isPropagatable())
          return; //done
      }
    }


    final Method mtd =
      ComponentsCtrl.getEventMethod(_comp.getClass(), evtnm);
    if (mtd != null) {
//      if (log.finerable()) log.finer("Method for event="+evtnm+" comp="+_comp+" method="+mtd);


      if (mtd.getParameterTypes().length == 0)
        mtd.invoke(_comp, null);
      else
        mtd.invoke(_comp, new Object[] {_event});
      if (!_event.isPropagatable())
        return; //done
    }


    retry = false;
    listenerCalled.clear();
    if (page != null)
      for (Iterator it = page.getListenerIterator(evtnm);;) {
        final EventListener el = nextListener(it);
        if (el == null) {
          break; //done
        } else if (el == RETRY) {
          retry = true;
          it = page.getListenerIterator(evtnm);
        } else if (!retry || !listenerCalled.contains(el)) {
          listenerCalled.add(el);


          el.onEvent(_event);
          if (!_event.isPropagatable())
            return; //done
        }
      }
  }

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      //remember the original event that cause the security login in session
      final Event evt = (Event) request.getAttribute(ZkEventExceptionFilter.EVENT);
    ((HttpServletRequest)request).getSession().setAttribute(ZkEventExceptionFilter.EVENT, evt);          


    if (!comp.isListenerAvailable(ON_ACEGILOGIN, true)) {
      final EventListener listener = new ShowWindowEventListener();
      comp.setAttribute(ON_ACEGILOGIN, listener);
      comp.addEventListener(ON_ACEGILOGIN, listener);
    }
    final String url = getLoginFormUrl();
      Events.postEvent(new Event(ON_ACEGILOGIN, comp, url != null ? url : "~./acegilogin.zul"));

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      _listeners = new HashMap(3);


    List l = (List)_listeners.get(evtnm);
    if (l != null) {
      for (Iterator it = l.iterator(); it.hasNext();) {
        final EventListener li = (EventListener)it.next();
        if (listener.equals(li))
          return false;
      }
    } else {
      _listeners.put(evtnm, l = new LinkedList());

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    if (_listeners != null) {
      final List l = (List)_listeners.get(evtnm);
      if (l != null) {
        for (Iterator it = l.iterator(); it.hasNext();) {
          final EventListener li = (EventListener)it.next();
          if (listener.equals(li)) {
            if (l.size() == 1)
              _listeners.remove(evtnm);
            else
              it.remove();

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