Disable Drag&Drop Resources out of Containers

MODX ResourceTree Onlysort.php

// Event: OnManagerPageBeforeRender

$script = "<script>
var ResourceTreeHandleDrop = MODx.tree.Resource.prototype._handleDrop;
Ext.override(MODx.tree.Resource, {
	_handleDrop:function(e){
		var dropNode = e.dropNode;
	        var targetParent = e.target;
		if(dropNode.getDepth() != targetParent.getDepth() || (e.point == 'append')) return false;
		if(dropNode.parentNode.id != targetParent.parentNode.id) return false;

		return ResourceTreeHandleDrop(e);
	} 
});
</script>";

$controller->head['html'][] = $script;
return true;