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use {NodeIndex, WidgetId};


/// An index either given in the form of a publicly instantiated `Widget`'s `WidgetId`, or an
/// internally instantiated `Widget`'s `NodeIndex`,
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub enum Index {
    /// A public identifier given by a user of a conrod library/widget, usually generated by the
    /// `widget_ids` macro.
    Public(WidgetId),
    /// An index to an internal widget, usually used to construct some other widget.
    Internal(NodeIndex),
}


impl From<WidgetId> for Index {
    fn from(id: WidgetId) -> Index {
        Index::Public(id)
    }
}

impl From<NodeIndex> for Index {
    fn from(idx: NodeIndex) -> Index {
        Index::Internal(idx)
    }
}