DraggableDetails constructor

DraggableDetails({bool wasAccepted: false, @required Velocity velocity, @required Offset offset })

Creates details for a DraggableDetails.

If wasAccepted is not specified, it will default to false.

The velocity or offset arguments must not be null.

Implementation 

DraggableDetails({
  this.wasAccepted = false,
  @required this.velocity,
  @required this.offset
}) : assert(velocity != null),
     assert(offset != null);