initializeDragGestureRecognizer method
Implementation
@override
void initializeDragGestureRecognizer(DragGestureRecognizer instance) {
instance
..onDown = onDragDown
..onStart = onDragStart
..onUpdate = onDragUpdate
..onEnd = onDragEnd
..onCancel = onDragCancel
..dragStartBehavior = dragStartBehavior;
}