onUpdate property Null safety
read / write
A pointer that is in contact with the screen with a primary button and moving has moved again.
The distance traveled by the pointer since the last update is provided in
the callback's details argument, which is a DragUpdateDetails object.
See also:
- kPrimaryButton, the button this callback responds to.
- DragUpdateDetails, which is passed as an argument to this callback.
Implementation
GestureDragUpdateCallback? onUpdate;