dispose method

@override void dispose()

Close streams of WM

Implementation

@override
void dispose() {
  assert(() {
    if (_ticker == null || !_ticker!.isActive) return true;
    throw FlutterError.fromParts(
      <DiagnosticsNode>[
        ErrorSummary(
          '$this was disposed with an active Ticker.',
        ),
        ErrorDescription(
          '$runtimeType created a Ticker via its SingleTickerProviderWidgetModelMixin, but at the time '
          'dispose() was called on the mixin, that Ticker was still active. The Ticker must '
          'be disposed before calling super.dispose().',
        ),
        ErrorHint(
          'Tickers used by AnimationControllers '
          'should be disposed by calling dispose() on the AnimationController itself. '
          'Otherwise, the ticker will leak.',
        ),
        _ticker!.describeForError('The offending ticker was'),
      ],
    );
  }());
  super.dispose();
}