I have made a custom TreeItemRenderer and overridden the set data function
to change the icon according to the data.
This is done something like this:
override public function set data(value:Object):void
{
super.data = value;
if(value != null) {
var myListData:TreeListData = TreeListData(this.listData
);
if (myListData) {
var fileObject:Object = value;
var _tree:Tree = Tree(myListData.owner);
if(fileObject.isMovie) {
_tree.setStyle('defaultLeafIcon',
this.movieIcon );
_tree.setStyle('folderClosedIcon',
this.movieIcon );
_tree.setStyle('folderOpenIcon',
this.movieIcon )
}
}
}
Hower, in some cases I get this exception:
TypeError: Error #1009: Cannot access a property or method of a null object
reference.
at mx.controls.listClasses::ListBase/styleChanged
()[E:\dev\flex_201_borneo\sdk\frameworks\mx\controls\listClasses\ListBase.as:3062]
at mx.controls::Tree/styleChanged
()[E:\dev\flex_201_borneo\sdk\frameworks\mx\controls\Tree.as:1048]
at mx.core::UIComponent/setStyle
()[E:\dev\flex_201_borneo\sdk\frameworks\mx\core\UIComponent.as:7222]
...
It's the styleChanged() method in ListBase.as which throws the error - on
this line:
var m:int = listItems[i].length;
.. so, it seems listItems[i] is null ?
Why? :-)
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