onDown property
getter/setter pair
A pointer has contacted the screen with a primary button and might begin to move.
The position of the pointer is provided in the callback's details
argument, which is a DragDownDetails object.
See also:
- allowedButtonsFilter, which decides which button will be allowed.
- DragDownDetails, which is passed as an argument to this callback.
Implementation
GestureDragDownCallback? onDown;