onStart property Null safety
read / write
A pointer has contacted the screen with a primary button and has begun to move.
The position of the pointer is provided in the callback's details
argument, which is a DragStartDetails object. The dragStartBehavior
determines this position.
See also:
- kPrimaryButton, the button this callback responds to.
- DragStartDetails, which is passed as an argument to this callback.
Implementation
GestureDragStartCallback? onStart;