[flexcoders] Cairngorm best practice with Tree data [f2b3]

Tue, 23 May 2006 21:11:08 -0700

Hi all,

I'm messing with Cairngorm 2.0 beta, and Flex 2.0 beta 3. I've got a
<mx:Tree /> that contains a structured set of data. This data can be
subjected to an insert at any point. I have correctly setup the events,
commands and delegate to deal with the insertion, and I process the
logical insertion on the server side of this application without issues.
The trouble I am having now is the graphical insertion of the new item
into the existing model.

Currently the data is XML based. The Tree is directly data bound to an
XMLListCollection object.

One thought I had was to model the entire tree as ValueObjects, so that
I could traverse the tree and 'addChild()' where necessary, but this
would be a complete replication of my Server-Side java code on the
client side, just for insertion. Additionally, I am not sure how i would
use a complex set of chained Value Objects as a data source for a Tree
GUI component.

Any information about this would be really helpful. I appreciate any advice.

I can display the tree correctly, I can use information from the
selected item to perform operations etc. I am interested in inserting a
new item at a specified location. For example, a request to insert an
item will result in XML data describing the insert:

Regards,
Graham Weldon.



========
XML Tree INSERTION data Sample
--------

<command action="" success="true">
    <addTreeItem parent="123">
        <element label="NEWitem" id="9999"/>
    </addTreeItem>
    <addTreeItem parent="380">
        <element label="deepItem" id="12"/>
    </addTreeItem>
</command>

========


========
XML Tree Data Sample
--------

<tree>
    <element label="one" id="123"/>
    <element label="two" id="122"/>
    <element label="eight" id="897">
        <element label="hello" id="113"/>
        <element label="world" id="198">
            <element label="thing" id="380"/>
        </element>
    </element>
</tree>

========


========
ModelLocator
--------
... snip ...

public var myTreeData : XMLListCollection = new XMLListCollection();

... snip ...
========


========
Application.mxml
--------
... snip ...

<myComponents:TreeComponent
    dataProvider="{ModelLocator.myTreeData}"/>

... snip ...
========


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