GestureRecognizer constructor Null safety

  1. {Object? debugOwner,
  2. @Deprecated('Migrate to supportedDevices. ' 'This feature was deprecated after v2.3.0-1.0.pre.') PointerDeviceKind? kind,
  3. Set<PointerDeviceKind>? supportedDevices}

Initializes the gesture recognizer.

The argument is optional and is only used for debug purposes (e.g. in the toString serialization).

It's possible to limit this recognizer to a specific set of PointerDeviceKinds by providing the optional supportedDevices argument. If supportedDevices is null, the recognizer will accept pointer events from all device kinds.


    'Migrate to supportedDevices. '
    'This feature was deprecated after v2.3.0-1.0.pre.',
  PointerDeviceKind? kind,
  Set<PointerDeviceKind>? supportedDevices,
}) : assert(kind == null || supportedDevices == null),
     _supportedDevices = kind == null ? supportedDevices : <PointerDeviceKind>{ kind };