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

  }


  public Page newPage(RequestInfo ri, Richlet richlet, String path) {
    final ServletRequest request = (ServletRequest) ri.getNativeRequest();
    if (request.getAttribute(DESKTOP_REUSE) != null) {
      final Page page = (Page) ri.getDesktop().getPages().iterator().next();
      if (page instanceof ReusablePage) {
        ((ReusablePage)page).setReuse(true);
        return page;
      } else {
        throw new IllegalStateException("Should be a ReuseablePage: "+page);

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public class TypePropertyEditor extends ClassEditor {
  public void setAsText(String text) {
    if (text.indexOf('.') < 0 && Character.isLowerCase(text.charAt(0))) {
      final Execution exec = Executions.getCurrent();
      if (exec != null) {
        final Page page = ((ExecutionCtrl)exec).getCurrentPage();
        final ComponentDefinition cd = page.getComponentDefinition(text, true);
        if (cd != null) {
          setAsText0(cd);
          return;
        }
      } else {

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  private static void storeFlowContextInPages(Execution exec) {
    final Desktop desktop = exec.getDesktop();
    final Collection pages= desktop.getPages();
    for (final Iterator it = pages.iterator(); it.hasNext();) {
      final Page page = (Page) it.next();
      page.setAttribute(FLOW_ID, exec.getAttribute(FLOW_ID));
      page.setAttribute(FLOW_EXECUTION_KEY, exec.getAttribute(FLOW_EXECUTION_KEY));
      page.setAttribute(FLOW_REQUEST_URI, exec.getAttribute(FLOW_REQUEST_URI));
      page.setAttribute(RequestContextELResolver.REQUEST_CONTEXT_VARIABLE_NAME, 
          exec.getAttributes().get(RequestContextELResolver.REQUEST_CONTEXT_VARIABLE_NAME));
    }
  }

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      String eventName = srcevt + "." + srccompid;
      Object srcCompBean = SpringUtil.getBean(srccompid);
      if(srcCompBean == null) {
        srcCompBean  = comp.getAttributeOrFellow(srccompid, true);
        if (srcCompBean == null) {
          Page page = comp.getPage();
          if (page != null)
            srcCompBean = page.getXelVariable(null, null, srccompid, true);
        }
      }
      if(srcCompBean == null || !(srcCompBean instanceof Component))
        continue;

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      public void removeAttribute(Session session, String name) {
        session.removeAttribute(name);
      }


      public Component getSelf(ExecutionCtrl exec) {
                final Page page = exec.getCurrentPage();
                final Scope scope = Scopes.getCurrent(page);
                if (scope != null) {
                        Object o = scope.getAttribute("self", false);
                        if(o instanceof Component) {
                                Component self = (Component) o;

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        ((ServletRequest)exec.getNativeRequest()).setAttribute(name, value);
        //can't access setAttribute directly, since signature of ZK 5 changed
      }


      public Component getSelf(ExecutionCtrl exec) {
        final Page page = exec.getCurrentPage();
        final Scope scope = Scopes.getCurrent(page);
        if (scope != null) {
          Component self = (Component) scope.getAttribute("self", true);
          //since ZK 3.6.1, event handling, use getImplicit()
          if (self == null) {

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    if (exec != null) {
      final String path = getPath();
      if (path != null && path.startsWith("/")) { //absolute path
        return Path.getComponent(path);
      } else {
        final Page page = ((ExecutionCtrl)exec).getCurrentPage();
        if (page != null){
          final Component self = (Component) page.getAttribute("self");
          if (self != null) { //loading page
            if (Components.isImplicit(getBeanName())) {
              return Components.getImplicit(self, getBeanName());
            }
            if (path == null) {

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    return _afterCompose;
  }


  private boolean hasBoundListeners(Object applied) {
    if (applied instanceof Page) {
      final Page applied0 = (Page) applied;
      if (applied0.getAttribute(BIND_EVENTLISTNERS) == null) {
        applied0.setAttribute(BIND_EVENTLISTNERS, Boolean.TRUE);
        return false;
      }
    } else if (applied instanceof Component) {
      final Component applied0 = (Component) applied;
      if (applied0.getAttribute(BIND_EVENTLISTNERS) == null) {
        applied0.setAttribute(BIND_EVENTLISTNERS, Boolean.TRUE);
        return false;
      }
    }
    return true;
  }

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      for (final Iterator it = listeners.iterator(); it.hasNext();) {
        final EventListener listener = (EventListener) it.next();
        target0.addEventListener(evtname, listener);
      }
    } else if (target instanceof Page) {
      final Page target0 = (Page) target;
      for (final Iterator it = listeners.iterator(); it.hasNext();) {
        final EventListener listener = (EventListener) it.next();
        target0.addEventListener(evtname, listener);
      }
    }
  }

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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.getAttributeOrFellow(name, true);
      }
      if (result == null && page != null) {
        result = page.getXelVariable(null, null, name, true);
      }


      return result;
    }

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org.zkoss.spring.bean.ZkComponentFactoryBean

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org.zkoss.spring.config.ZkSpringBeanBindingComposer

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Examples of org.zkoss.zk.ui.Page

Desktop

Inter-page Communication

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