onDown property

GestureDragDownCallback? onDown

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:

• kPrimaryButton, the button this callback responds to.
• DragDownDetails, which is passed as an argument to this callback.

Implementation

GestureDragDownCallback? onDown;