Mainpage and Task Flow region interaction

In JDeveloper 11g a Task Flow region can exists isolated in your ADF page, but there are ways to interact with this region. For example you can use input parameters like I did in this example or you can pass ADF pagedef events to the region like I did in this example. In this blog I will use queueActionEventInRegion method to start a navigation action in the Task Flow from the mainpage so it goes to the next page fragment and I will use a regionNavigationListener on the region to get the current displayed page fragment of the region so I can use this in the mainpage to disable some buttons. ( Thanks David Giammona for the great region interaction paper ).
Here some pics of the example I made. In the mainpage I have two buttons with these buttons I pass a event to the region so it goes to the next pagefragment. When this happens the regionNavigationListener is fired and the new displayed view is passed on the mainpage so I can disable the right button.




The bounded Task Flow I use for this example with two pages and some control flow cases between these two fragments
Here is the mainpage jsf page code with the regionNavigationListener on the af:region component.

<?xml version='1.0' encoding='windows-1252'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
         xmlns:f="http://java.sun.com/jsf/core"
         xmlns:h="http://java.sun.com/jsf/html"
         xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
 <jsp:directive.page contentType="text/html;charset=windows-1252"/>
 <f:view>
   <af:document>
     <af:form>
     <af:panelHeader text="Main page">
         <f:facet name="context">
           <af:panelGroupLayout layout="horizontal">
             <af:outputLabel value="Old view"/>
             <af:outputText value="#{Main.oldRegionView}"
                            id="old"/>
             <af:spacer width="50" height="1"/>
             <af:outputLabel value="New view"/>
             <af:outputText value="#{Main.newRegionView}"
                            id="new"/>
           </af:panelGroupLayout>
         </f:facet>
         <f:facet name="legend">
           <af:toolbar>
             <af:commandToolbarButton text="Page1"
                                      id="buttonPage1"
                                      actionListener="#{Main.pageOneActionListener}"
                                      disabled="#{Main.newRegionView eq '/region-task-flow/page1'}"/>
            <af:commandToolbarButton  text="Page2" 
                                      id="buttonPage2"
                                      actionListener="#{Main.pageTwoActionListener}"
                                      disabled="#{Main.newRegionView eq '/region-task-flow/page2'}"/>
           </af:toolbar>
         </f:facet>
         <af:panelBox text="Task Flow Region" showDisclosure="false">
           <f:facet name="toolbar"/>
           <af:region value="#{bindings.regiontaskflow1.regionModel}"
                      id="regio1"
                      binding="#{Main.region}"
                      regionNavigationListener="#{Main.navigationListener}"/>
         </af:panelBox>
       </af:panelHeader>
     </af:form>
   </af:document>
 </f:view>
</jsp:root>

and here is backing bean code where I pass a queueActionEventInRegion event so it navigates to the other page fragment.

package nl.whitehorses.tf.region.view.backing;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;

import javax.faces.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.faces.event.PhaseId;

import oracle.adf.view.rich.component.rich.fragment.RichRegion;
import oracle.adf.view.rich.context.AdfFacesContext;
import oracle.adf.view.rich.event.RegionNavigationEvent;

public class MainPage {
   private RichRegion region;
   private String OldRegionView;
   private String NewRegionView;
   private String outcome;

   public MainPage() {
   }

   public void pageOneActionListener(ActionEvent actionEvent) {
       outcome = "to1";
       region.queueActionEventInRegion(getMethodExpression("#{Main.getOutcomeExpression}"),
                                       null, null, false, -1, -1,
                                       PhaseId.ANY_PHASE);
   }

   public void pageTwoActionListener(ActionEvent actionEvent) {
       outcome = "to2";
       region.queueActionEventInRegion(getMethodExpression("#{Main.getOutcomeExpression}"),
                                       null, null, false, -1, -1,
                                       PhaseId.ANY_PHASE);
   }

   private MethodExpression getMethodExpression(String name) {
       FacesContext facesCtx = FacesContext.getCurrentInstance();
       Application app = facesCtx.getApplication();
       ExpressionFactory elFactory = app.getExpressionFactory();
       ELContext elContext = facesCtx.getELContext();
       return elFactory.createMethodExpression(elContext, name, String.class, new Class[] { });
   }


   public String getOutcomeExpression() {
       return outcome;
   }

   public void navigationListener(RegionNavigationEvent event) {
       NewRegionView = event.getNewViewId();
       OldRegionView = event.getOldViewId();
       AdfFacesContext.getCurrentInstance().addPartialTarget(getUIComponent("old"));
       AdfFacesContext.getCurrentInstance().addPartialTarget(getUIComponent("new"));
       AdfFacesContext.getCurrentInstance().addPartialTarget(getUIComponent("buttonPage1"));
       AdfFacesContext.getCurrentInstance().addPartialTarget(getUIComponent("buttonPage2"));
   }

   private UIComponent getUIComponent(String name) {
       FacesContext facesCtx = FacesContext.getCurrentInstance();
       return facesCtx.getViewRoot().findComponent(name);
   }

   public void setRegion(RichRegion region) {
       this.region = region;
   }

   public RichRegion getRegion() {
       return region;
   }

   public String getOldRegionView() {
       return OldRegionView;
   }

   public String getNewRegionView() {
       return NewRegionView;
   }

}

Here is the example workspace.