onTouchOut property Null safety

EventStream<TouchEvent> onTouchOut

Dispatched when the user moves the point of contact away from InteractiveObject instance on a touch-enabled device.

You have to opt-in for touch events by setting the InputEventMode to TouchOnly or MouseAndTouch in the stage options.

Implementation

EventStream<TouchEvent> get onTouchOut =>
    InteractiveObject.touchOutEvent.forTarget(this);