mount method
Implementation
@override
void mount() {
gestureDetectors.add<ImmediateMultiDragGestureRecognizer>(
ImmediateMultiDragGestureRecognizer.new,
(ImmediateMultiDragGestureRecognizer instance) {
instance.onStart = (Offset point) => FlameDragAdapter(this, point);
},
);
super.mount();
}