Preparation

• You have to use StatefulWidget or HookWidget
• You can implement it without any event conflicts by using Listener widget.

SourceCode

I will intraduce it by using flutter_fooks

Define State

Define cursorIcon state inside a build method.

    final cursorIcon = useState<SystemMouseCursor>(SystemMouseCursors.grab);

Wrap your widget by Listener

1. Wrap your widget by Listener.
2. Also wrap your widget by MouseRegion.

   child: Listener(
   onPointerDown: (_){
       debugPrint("down");
       cursorIcon.value = SystemMouseCursors.grabbing;
   },
   onPointerUp: (_){
       debugPrint("up");
   cursorIcon.value = SystemMouseCursors.grab;
   },
   child: MouseRegion(
   cursor: cursorIcon.value,

If you want to use another cursor icons , you can change SystemMouseCursors.XXXX.