GestureDragStartCallback typedef Null safety

void GestureDragStartCallback(
  1. DragStartDetails details
)

Signature for when a pointer has contacted the screen and has begun to move.

The details object provides the position of the touch when it first touched the surface.

See DragGestureRecognizer.onStart.

Implementation

typedef GestureDragStartCallback = void Function(DragStartDetails details);