PortPanEndCallback typedef
PortPanEndCallback =
void Function(DragEndDetails details)
The typedef PortPanEndCallback = void Function(DragEndDetails details); line in the code is
defining a function type alias in Dart. It creates an alias PortPanEndCallback for a function that
takes one parameter details of type DragEndDetails and returns void. This allows you to define
functions with this specific signature and use them as callbacks in your code where
PortPanEndCallback type is expected.
Implementation
typedef PortPanEndCallback = void Function(DragEndDetails details);