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

    return comp;
  }
  public boolean isInstance(Component comp) {
    Class cls;
    if (_implcls instanceof String) {
      final Page page = comp.getPage();
      if (page != null) {
        try {
          cls = resolveImplementationClass(page, null);
        } catch (ClassNotFoundException ex) {
          return true; //consider as true if not resolvable

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  public Object getValue(Component comp) {
    if (_value != null)
      return _value.getValue(_evalr, comp);


    Desktop desktop = comp.getDesktop();
    Page page;
    if (desktop == null) {
      Execution exec = Executions.getCurrent();
      if (exec == null)
        throw new IllegalStateException("Not attached, nor execution");
      desktop = exec.getDesktop();

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  }


  private String getUuid(AuRequest request) {
    final Component comp = request.getComponent();
    if (comp != null) return comp.getUuid();
    final Page page = request.getPage();
    if (page != null) return page.getUuid();
    return null;
  }

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  private Comparator toComparator(String clsnm)
  throws ClassNotFoundException, InstantiationException,
  IllegalAccessException {
    if (clsnm == null || clsnm.length() == 0) return null;


    final Page page = getPage();
    final Class cls = page != null ?
      page.getZScriptClass(clsnm): Classes.forNameByThread(clsnm);
    if (cls == null)
      throw new ClassNotFoundException(clsnm);
    if (!Comparator.class.isAssignableFrom(cls))
      throw new UiException("Comparator must be implemented: "+clsnm);
    return (Comparator)cls.newInstance();

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    if (TimeZones.getThreadLocal() == null)
      TimeZones.setThreadLocal(_timeZone);
    else
      _timeZone = null;


    final Page page = _exec.getDesktop().getFirstPage();
    if (page != null)
      execCtrl.setCurrentPage(page);
  }

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    final DesktopRecycle dtrc = wapp.getConfiguration().getDesktopRecycle();
    Desktop desktop = dtrc != null ? Utils.beforeService(dtrc, svlctx, sess, httpreq, httpres, path): null;


    try {
      if (desktop != null) { //recycle
        final Page page = Utils.getMainPage(desktop);
        if (page != null) {
          final Execution exec =
            new ExecutionImpl(svlctx, httpreq, httpres, desktop, page);
          fixContentType(response);
          wappc.getUiEngine()
            .recycleDesktop(exec, page, response.getWriter());
        } else
          desktop = null; //something wrong (not possible; just in case)
      }


      if (desktop == null) {
        desktop = webman.getDesktop(sess, httpreq, httpres, path, true);
        if (desktop == null) //forward or redirect
          return true;


        final RequestInfo ri = new RequestInfoImpl(
          wapp, sess, desktop, httpreq,
          PageDefinitions.getLocator(wapp, path));
        ((SessionCtrl)sess).notifyClientRequest(true);


        final Page page;
        final PageRenderPatch patch = getRenderPatch();
        final Writer out = patch.beforeRender(ri);
        final UiFactory uf = wappc.getUiFactory();
        if (uf.isRichlet(ri, bRichlet)) {
          final Richlet richlet = uf.getRichlet(ri, path);

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  //-- super --//
  public void redraw(java.io.Writer out) throws java.io.IOException {
    final Execution exec = Executions.getCurrent();
    final StringWriter bufout = new StringWriter();
    final Page page = getPage();
    final Object ret = PageRenderer.beforeRenderHtml(exec, page, bufout);
    super.redraw(bufout);
    PageRenderer.afterRenderHtml(exec, page, bufout, ret);


    final StringBuffer buf = bufout.getBuffer();

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    return resolveVariable(null, null, name);
  }
  //-- VariableResolverX --//
  public Object resolveVariable(XelContext ctx, Object base, Object onm) {
    if (base != null) {
      final Page page = ((ExecutionCtrl)_exec).getCurrentPage();
      return page != null ? page.getXelVariable(ctx, base, onm, true): null;
    }


    if (onm == null)
      return null;


    final String name = onm.toString();
    if (name == null || name.length() == 0) //just in case
      return null;


    //Note: we have to access keyword frist (rather than component's ns)
    //since 1) BeanShell interpreter will store back variables
    //and page.getZScriptVariable will return the old value
    //2) ZK 5, getAttributeOrFellow doesn't look for variable resolvers and implicit objects 
    if ("arg".equals(name))
      return _exec.getArg();
    if ("componentScope".equals(name)) {
      if (_self instanceof Component)
        return ((Component)_self).getAttributes(Component.COMPONENT_SCOPE);
      return Collections.EMPTY_MAP;
    }
    if ("desktopScope".equals(name))
      return _exec.getDesktop().getAttributes();
    if ("desktop".equals(name))
      return _exec.getDesktop();
    if ("execution".equals(name))
      return _exec;
    if ("pageScope".equals(name)) {
      if (_self instanceof Component)
        return ((Component)_self).getAttributes(Component.PAGE_SCOPE);
      if (_self instanceof Page)
        return ((Page)_self).getAttributes();
      final Page page = ((ExecutionCtrl)_exec).getCurrentPage();
      return page != null ? page.getAttributes(): Collections.EMPTY_MAP;
    }
    if ("page".equals(name)) {
      if (_self instanceof Component)
        return getPage((Component)_self);
      if (_self instanceof Page)
        return (Page)_self;
      return ((ExecutionCtrl)_exec).getCurrentPage();
    }
    if ("requestScope".equals(name))
      return _exec.getAttributes();
    if ("self".equals(name))
      return _self;
    if ("sessionScope".equals(name))
      return _exec.getDesktop().getSession().getAttributes();
    if ("session".equals(name))
      return _exec.getDesktop().getSession();
    if ("spaceOwner".equals(name)) {
      if (_self instanceof Component)
        return ((Component)_self).getSpaceOwner();
      if (_self instanceof Page)
        return (Page)_self;
      return null;
    }
    if ("spaceScope".equals(name)) {
      if (_self instanceof Component)
        return ((Component)_self).getAttributes(Component.SPACE_SCOPE);
      if (_self instanceof Page)
        return ((Page)_self).getAttributes();
      return Collections.EMPTY_MAP;
    }


    if (_self instanceof Component) {
      final Component comp = (Component)_self;


      //We have to look getZScriptVariable first and then namespace
      //so it is in the same order of interpreter
      final Page page = getPage(comp);
      if (page != null) {
        final Object o =
          page.getZScriptVariable(comp, name);
        if (o != null)
          return o;
      }


      Object o = _exec.getAttribute(name);
      if (o != null || _exec.hasAttribute(name))
        return o;


      o = comp.getAttributeOrFellow(name, true);
      if (o != null)
        return o;


      if (page != null) {
        o = page.getXelVariable(ctx, null, name, true);
        if (o != null)
          return o;
      }
    } else {
      Page page;
      if (_self instanceof Page) {
        page = (Page)_self;
      } else {
        page = ((ExecutionCtrl)_exec).getCurrentPage();
      }


      if (page != null) {
        Object o = page.getZScriptVariable(name);
        if (o != null)
          return o;


        o = _exec.getAttribute(name);
        if (o != null || _exec.hasAttribute(name))
          return o;


        o = page.getAttributeOrFellow(name, true);
        if (o != null)
          return o;


        o = page.getXelVariable(ctx, null, name, true);
        if (o != null)
          return o;
      } else {
        Object o = _exec.getAttribute(name, true);
        if (o != null || _exec.hasAttribute(name, true))

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    }


    return Evaluators.resolveVariable(_parent, name);
  }
  private static Page getPage(Component comp) {
    Page page = comp.getPage();
    if (page != null) return page;


    final Execution exec = Executions.getCurrent();
    return exec != null ? ((ExecutionCtrl)exec).getCurrentPage(): null;
  }

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        Component comp = (Component)scope;
        Object val = comp.getAttributeOrFellow(name, true);
        if (val != null || comp.hasAttributeOrFellow(name, true))
          return val;


        Page page = comp.getPage();
        if (page != null) {
          val = page.getXelVariable(null, null, name, true);
          if (val != null)
            return val;
        }
      } else if (scope instanceof Page) {
        Page page = (Page)scope;
        Object val = page.getAttributeOrFellow(name, true);
        if (val != null || page.hasAttributeOrFellow(name, true))
          return val;


        val = page.getXelVariable(null, null, name, true);
        if (val != null)
          return val;
      } else {
        Object val = scope.getAttribute(name, true);
        if (val != null || scope.hasAttribute(name, true))

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Examples of org.zkoss.zk.ui.Page

Desktop

Inter-page Communication

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