Examples of org.zkoss.zk.ui.Page

org.zkoss.zk.ui.Page
A page. A desktop consists of a set of pages.
When a ZK request is asking to render a new page, a new page is created and components that are created duing this request all belong to this page.
If a ZK requst is asking an update, it must have at lease one UUID of a component ( {@link Component#getUuid}. From this UUID, we know which page it belongs and activate it to process the update.
By activation, the system guarantees no concurrent access to pages and components (so you don't need use synchronized for them).
Desktop

In portal and some environments, a client request (e.g., ServletRequest) might consists of several ZK requests ( {@link org.zkoss.zk.au.AuRequest}). While each ZK request might ask to create an independent page, all these pages are grouped as a desktop, such that they are activated and removed at the same time. Moreover, pages in the same desktop could communicate to eath other (see Inter-page communication).
A session, {@link Session}, might have multiple desktops of pages, {@link Page}, while a page belongs to exactly one session. A page, {@link Page}, might have many components, {@link Component}, while a component belongs to exactly one page.
All components of the same desktop of pages are removed at the same time if a page become 'obsolete'.
During each execution (${link Execution}), exactly one desktop of pages are locked (aka., activated). Though an execution serves a client request (e.g., ServletRequest), a client request might consist of multiple ZK request ( {@link org.zkoss.zk.au.AuRequest}). Each ZK request might target to a different page (of the same desktop).
Inter-page Communication

To do inter-page communication, you could do:
1. Invoke methods of components from another page directly.
2. Use {@link Execution#postEvent} to post events to components fromanother page.
They are the same as handling components from the same page. However, invoking method directly for components from another page has one restriction:
It cannot create component. @author tomyeh


      // TODO: get component instance from bean manager
      // try EL resolver or check any api/spi interface
      Object srccomp = xcomp.getAttributeOrFellow(srccompid, true);
      if (srccomp == null) {
        Page page = xcomp.getPage();
        if (page != null)
          srccomp = page.getXelVariable(null, null, srccompid, true);
      }
      if (srccomp == null || !(srccomp instanceof Component)) {
        log.debug("Cannot find the associated component to forward event: "
                + mdname);
      } else {

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  /**VariableResolver to handle model's variable **/
  private class InnerVariableResolver implements VariableResolver,Serializable{
    private static final long serialVersionUID = 1L;
    public Object resolveVariable(String name) throws XelException {
      Page page = getPage();
      Object result = null;
      if(page!=null){
        result = page.getZScriptVariable(Spreadsheet.this, name);
      }
      if(result==null){
        result = Spreadsheet.this.getVariable(name, false); 
      }

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  }
  
  private class InnerFunctionMapper implements FunctionMapper,Serializable{
    private static final long serialVersionUID = 1L;
    public Collection getClassNames() {
      Page page = getPage();
      if(page!=null){
        return page.getFunctionMapper().getClassNames();
      }
      return null;
    }

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        return page.getFunctionMapper().getClassNames();
      }
      return null;
    }
    public Class resolveClass(String name) throws XelException {
      Page page = getPage();
      if(page!=null){
        return page.getFunctionMapper().resolveClass(name);
      }
      return null;
    }

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        return page.getFunctionMapper().resolveClass(name);
      }
      return null;
    }
    public Function resolveFunction(String prefix, String name) throws XelException {
      Page page = getPage();
      if(page!=null){
        return page.getFunctionMapper().resolveFunction(prefix,name);
      }
      return null;
    }

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  /** Returns the main page of the desktop.
   * It assumes there is at most one main page (that is, a page without owner)
   */
  /*package*/ static Page getMainPage(Desktop desktop) {
    for (Iterator it = desktop.getPages().iterator(); it.hasNext();) {
      final Page page = (Page)it.next();
      if (((PageCtrl)page).getOwner() == null)
        return page;
    }
    return null;
  }

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public class ShowWindowEventListener implements EventListener {
  public void onEvent(Event event) {
    //fetch old Event stored in Session and post again
    final Component comp = event.getTarget();
    
    final Page page = comp.getPage();
    final String url = (String) event.getData();
    final Execution exec = Executions.getCurrent();
    try {
      doModal(page, url);
      } finally {

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public class ShowWindowEventListener implements EventListener {
  public void onEvent(Event event) {
    //fetch old Event stored in Session and post again
    final Component comp = event.getTarget();
    
    final Page page = comp.getPage();
    final String url = (String) event.getData();
    final Execution exec = Executions.getCurrent();
    try {
      doModal(page, url);
      } finally {

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    } finally {
      Scopes.afterInterpret();
    }
  }
  private void process0(Scope scope) throws Exception {
    final Page page = getPage();
    if (page == null || !page.isAlive()) {
      String msg = (page == null ? "No page is available in "+_desktop: "Page "+page+" was destroyed");
      if (_desktop.isAlive())
        msg += " (but desktop is alive)";
      else
        msg += " because desktop was destroyed.\n"
        +"It is usually caused by invalidating the native session directly. "
        +"If it is required, please set Attributes.RENEW_NATIVE_SESSION first.";
      log.warning(msg);
    }


    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())

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    ExecutionsCtrl.setCurrent(null);
    SessionsCtrl.setCurrent((Session)null);
  }


  private Page getPage() {
    final Page page = _comp.getPage();
    if (page != null)
      return page;


    return _desktop.getFirstPage();
  }

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Examples of org.zkoss.zk.ui.Page

Desktop

Inter-page Communication

Related Classes of org.zkoss.zk.ui.Page