Here is the solution. This creates a clickable breadcrumb trail as the user
moves through the pageflow. The breadcrumb trail gets correctly adjusted if
the user goes back.
1- A page action mapped to "*" in pages.xml
| <pages>
|
| <page view-id="*" action="#{breadcrumb.log}"/>
|
| </pages>
|
2- A "breadcrumb" Seam component:
| @Name("breadcrumb")
| public class BreadcrumbHandler {
| private List<Page> conversationCrumb;
|
| public void log() {
| try {
| if (Contexts.isConversationContextActive()) {
| conversationCrumb = (List)
Contexts.lookupInStatefulContexts("conversationCrumb");
| if (null == conversationCrumb) conversationCrumb = new
LinkedList<Page>();
| if (null != Pageflow.instance()) {
| if (null != Pageflow.instance().getPage()) {
| Page thePage =
Pageflow.instance().getPage();
| if
(conversationCrumb.contains(thePage)) {
| // rewind the conversation
crumb to where the page is
| conversationCrumb =
conversationCrumb.subList(0, conversationCrumb.indexOf(thePage)+1);
| } else {
| conversationCrumb.add(thePage);
| }
| }
|
Contexts.getConversationContext().set("conversationCrumb",conversationCrumb);
| }
| } else {
|
Contexts.removeFromAllContexts("conversationCrumb");
| }
| } catch (Throwable t) {
| // Do nothing as this is just a "listener" for
breadcrumbs
| t.printStackTrace();
| }
| }
|
| public void navigate()
| {
|
| FacesContext context = FacesContext.getCurrentInstance();
| Map map = context.getExternalContext().getRequestParameterMap();
| String viewId = (String) map.get("viewId");
| String pageName = (String) map.get("name");
|
| Pageflow.instance().reposition(pageName);
|
| Redirect redirect = Redirect.instance();
| redirect.setViewId(viewId);
| redirect.execute();
|
| }
| }
|
|
3- JSF tags needed to display the crumbs. This relies on the h:commandLink
which creates Javascript, but it's probably pretty easy to change this to an
s:link instead (although s:link won't take paramaters until the Seam 1.1
release). Also, I wish I could print out the page description instead of the
page name, but Seam has a bug when calling getDescription on a page
(http://jira.jboss.com/jira/browse/JBSEAM-272)
| <t:dataList value="#{conversationCrumb}" var="crumb">
| <h:outputText value=" | "/>
| <h:commandLink action="#{breadcrumb.navigate}">
| <f:param name="viewId" value="#{crumb.viewId}"/>
| <f:param name="name" value="#{crumb.name}"/>
| <h:outputText value="#{crumb.name}"/>
| </h:commandLink>
| </t:dataList>
|
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