Please... Need help on DragnDrop Tree...

[alclientview]

I have the following code almost the same as the demo website except I hoping to enable drag and drop to any folder and not only the
top folders (under root):

<rich:dragIndicator id="indicator1" >
 <f:facet name="single">
 <h:graphicImage styleClass="indicatorPicture" value="/richfaces/jQuery/images/{draggedImage}" />
 </f:facet>
 </rich:dragIndicator>
 <rich:dragIndicator id="indicator2" />

 <h:panelGrid columns="2" width="100%" columnClasses="col1,col2">

 <rich:tree ajaxKeys="#{null}" style="width:300px" nodeSelectListener="#{treeDndBean.processSelection}"
 reRender="#{areaToRerender}" ajaxSubmitSelection="true" switchType="client" dragIndicator="indicator2"
 value="#{treeDndBean.treeNode}" var="item" id="tree" treeNodeVar="treeNode"
 dropListener="#{treeDndBean.dropListener}" nodeFace="#{treeNode.leaf ? 'leaf' : 'node'}">
 <rich:treeNode type="node" acceptedTypes="pic">
 <h:outputText value="#{item}"/>
 </rich:treeNode>
 <rich:treeNode type="leaf" dragType="pic">
 <rich:dndParam name="label" type="drag">#{item}</rich:dndParam>
 <h:outputText value="#{item}"/>
 </rich:treeNode>
 </rich:tree>

 <a4j:commandButton value="New folder" action="#{treeDndBean.newFolder}" reRender="tree" />
 <a4j:commandButton value="New leaf" action="#{treeDndBean.newLeaf}" reRender="tree" />

 </h:panelGrid>

Everything works fine except that the dropListener is never called eventhough it is allowed to drop (based on the drag indicator). I overwrote the isLeaf method of TreeNode in my implementation and I made sure, leaf is really a leaf (that is, it has no children). If I replace

nodeFace="#{treeNode.leaf ? 'leaf' : 'node'}"

with

nodeFace="#{treeNode.parent == null ? 'node' : 'leaf'}"

I can drop into top folders (same as the demo).

Another thing I don't understand is that if I write something like nodeFace="#{treeNode.type == 'leaf' ? 'leaf' : 'node'}" when I select a node I have the following exception: Property 'type' not found on type org.richfaces.model.CacheableTreeNodeImpl
No idea where does CacheableTreeNodeImpl come from and to be honest it is hard to understand how this works with the available documentation.

I would really appreciate any help...

Thanks in advance!

Arnaud.

[nbelaevski]

Hello Arnaud,

There's a request caching for model in the tree component and it's on by default, that's where these nodes are coming from. You can switch caching off by setting preserveModel="none" or try 3.3.1.GA if you're not using it - I've fixed similar issue there - maybe this will help?

[alclientview]

Hi,

I've just try with preserveModel='none' and the nodeFace="#{treeNode.leaf ? 'leaf' : 'node'} works fine now.
I'm not sure but it looks like if preserveModel='none' is not used the isLeaf method call is made on TreeNodeImpl instead of my implementation of TreeNodeImpl. And probably TreeNodeImpl for some reason does not return the expected value.
When preserveModel='none' is used, I guess the call is made on my implementation and the expected value is returned.

Anway, it works fine now and thank you for your time!

Arnaud.

[nbelaevski]

Arnaud,

You're right that's exactly how it works.