onUpdate property

GestureDragUpdateCallback? onUpdate

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;