dispose method

@override void dispose()

Tears down any active session (its collaborators own their tickers and timers). Call from the owning widget's dispose.

Implementation

@override
void dispose() {
  final session = _session;
  if (session != null) {
    session.detachAll(SessionExit.dispose);
    _pointerPosition.value = null;
    _session = null;
  }
  _pointerPosition.dispose();
  super.dispose();
}