Simple Tree Question

Question

Hello,
I have a tree control which currently stays expanded all the time by using the following code:
on the updateComplete event of the tree (tree) I call this:
private function expandAllNodes(e:Event)
     if (tree != null){
         if   (tree.dataProvider.length > 0){
               tree.expandChildrenOf(tree.dataProvider[0]);
it works exactly the way I want it to and it keeps the tree open all the time. So far so good.
But I'd like to do this instead:
When an item is added to the tree (the dataProvider actually), expand all nodes (like it does now). But I'd also like to be able to collapse nodes if the list gets really long (which it might).
However whenever I collapse a node, the updateComplete fires and opens it back up. Is there another event I should use instead of the updateComplete that wouldn't cause the expand all to get called again ?
Thanks in advance,
Jeff

Answer 1

A simple solution could be to set a flag:
private var enableExpand:Boolean = true;
In your expand handler add:
if (tree != null && enableExpand){
         if   (tree.dataProvider.length > 0){
               tree.expandChildrenOf(tree.dataProvider[0]);
enableExpand = true;
then, in your addItemToTree function or wherever you want, you can set the enableExpand property to false.
It will then prevent the expand handler to execute one time.
Dany