Trait zng::var::AnyVarSubscribe

pub trait AnyVarSubscribe: AnyVar {
    // Required method
    fn subscribe(&self, op: UpdateOp, widget_id: WidgetId) -> VarHandle;
}

Extension method to subscribe any widget to a variable.

Also see WIDGET methods for the primary way to subscribe from inside a widget.

Required Methods

fn subscribe(&self, op: UpdateOp, widget_id: WidgetId) -> VarHandle

Register the widget to receive an UpdateOp when this variable is new.

Variables without the NEW capability return VarHandle::dummy.

Implementors

impl<V> AnyVarSubscribe for V

where V: AnyVar,