Function conrod_core::widget::graph::node_widget_id

pub fn node_widget_id<NI>(node_id: NI, graph_id: Id, ui: &Ui) -> Option<Id> where
    NI: NodeId, 

Returns the widget::Id for a node if one exists.

Returns None if there is no Graph for the given graph_id or if there is not yet a widget::Id for the given node_id.

This will always return None if called between calls to the Graph::set and node instantiation stages, as widget::Ids for nodes are only populated during the node instantiation stage.