MODX FilesTree Drag onlyfiles

MODX FilesTree Drag onlyfiles.php

// Event: OnManagerPageBeforeRender

$script = "<script>
DirectoryTreeHandleDrop = MODx.tree.Directory.prototype._handleDrop;
Ext.override(MODx.tree.Directory, {
	_handleDrop:function(e){
		var dropNode = e.dropNode;
	        var targetParent = e.target;
		if(dropNode.hasChildNodes()) return false;
		return DirectoryTreeHandleDrop(e);
	} 
});
</script>";

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