flutter: Add more print

src/ui/flutter_app/lib/common/settings.dart

@@ -48,6 +48,8 @@ class Settings {
     final contents = jsonEncode(_values);
     await _file.writeAsString(contents);
 
+    print("Settings is committed.");
+
     return true;
   }
 
@@ -64,6 +66,8 @@ class Settings {
       _file = File('${docDir.path}/$fileName');
     }
 
+    print("Loading $_file ...");
+
     try {
       final contents = await _file.readAsString();
       _values = jsonDecode(contents);

src/ui/flutter_app/lib/engine/native_engine.dart

@@ -121,6 +121,7 @@ class NativeEngine extends Engine {
 
   Future<void> stopSearching() async {
     isActive = false;
+    print("Stop current thinking...");
     await send('stop');
   }
 
@@ -169,8 +170,6 @@ class NativeEngine extends Engine {
       posFenStr = "position fen $startPosition moves $moves";
     }
 
-    print("posFenStr: $posFenStr");
-
     return posFenStr;
   }
 }

src/ui/flutter_app/lib/mill/game.dart

@@ -79,6 +79,9 @@ class Game {
   };
 
   bool aiIsSearching() {
+    print("White is searching? ${isSearching[PieceColor.white]}\n"
+        "Black is searching? ${isSearching[PieceColor.black]}\n");
+
     return isSearching[PieceColor.white] == true ||
         isSearching[PieceColor.black] == true;
   }
@@ -105,6 +108,9 @@ class Game {
       default:
         break;
     }
+
+    print("White is AI? ${isAi[PieceColor.white]}\n"
+        "Black is AI? ${isAi[PieceColor.black]}\n");
   }
 
   select(int pos) {

src/ui/flutter_app/lib/mill/position.dart

@@ -240,6 +240,8 @@ class Position {
         " " +
         (1 + (gamePly - sideIsBlack) ~/ 2).toString();
 
+    print("FEN is $ss");
+
     return ss;
   }
 
@@ -388,6 +390,7 @@ class Position {
       if (st.key == i) {
         repetition++;
         if (repetition == 3) {
+          print("Has game cycle.");
           return true;
         }
       }

src/ui/flutter_app/lib/widgets/game_page.dart

@@ -81,6 +81,7 @@ class _GamePageState extends State<GamePage> with RouteAware {
 
   changeStatus(String? status) {
     if (!mounted) return;
+    if (status != null) print("changeStatus: $status");
 
     setState(() => _status = status);
   }
@@ -121,7 +122,7 @@ class _GamePageState extends State<GamePage> with RouteAware {
 
   onBoardTap(BuildContext context, int index) {
     if (!isReady) {
-      print("Not ready, skip onBoardTap.");
+      print("Not ready, ignore tapping.");
       return false;
     }
 
@@ -136,6 +137,7 @@ class _GamePageState extends State<GamePage> with RouteAware {
     int? sq = indexToSquare[index];
 
     if (sq == null) {
+      print("sq is null, skip tapping.");
       return;
     }
 
@@ -964,6 +966,7 @@ class _GamePageState extends State<GamePage> with RouteAware {
 
   @override
   void dispose() {
+    print("dipose");
     widget.engine.shutdown();
     super.dispose();
     routeObserver.unsubscribe(this);