feat(victory): show victory screen when user solve the puzzle

lib/l10n/app_en.arb

@@ -38,5 +38,13 @@
     "play": "Play",
     "@play": {
       "description": "Play button label"
+    },
+    "victory_title": "You win !",
+    "@victory_title": {
+      "description": "Victory title"
+    },
+    "restart_btn": "Restart",
+    "@restart_btn": {
+      "description": "Restart button label"
     }
 }

lib/l10n/app_fr.arb

@@ -5,5 +5,7 @@
     "solve": "Résoudre",
     "team_name": "Xpeho mobile",
     "moves": "Mouvements {count}",
-    "play": "Jouer"
+    "play": "Jouer",
+    "victory_title": "Victoire !",
+    "restart_btn": "Recommencer"
 }

lib/models/puzzle.dart

@@ -40,6 +40,8 @@ class Puzzle {
       .map((tile) => tile.currentError(getXof(tile), getYof(tile)))
       .reduce((a, b) => a + b);
 
+  bool get isSolved => error == 0;
+
   /// perform a swap between two tiles
   Puzzle move(int value) {
     final newData = List<Tile>.from(data);

lib/view/puzzle_page/puzzle_page.dart

@@ -48,6 +48,11 @@ class _PuzzlePageState extends State<PuzzlePage> {
     return BlocBuilder<PuzzleCubit, PuzzleState>(
       builder: (context, state) => OrientationBuilder(
         builder: (context, orientation) {
+          if (state.puzzle.isSolved && state.moves > 0) {
+            WidgetsBinding.instance?.addPostFrameCallback(
+              (timeStamp) => _showVictoryScreen(context),
+            );
+          }
           if (orientation == Orientation.portrait) {
             return _buildPortrait(context, state);
           } else {
@@ -309,4 +314,14 @@ class _PuzzlePageState extends State<PuzzlePage> {
       ),
     );
   }
+
+  Future<void> _showVictoryScreen(BuildContext context) async {
+    await showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        content: Victory(),
+      ),
+    );
+    _reset(context);
+  }
 }

lib/view/puzzle_page/widgets/widgets.dart

@@ -5,3 +5,4 @@ export 'puzzle.dart';
 export 'text_tile.dart';
 export 'tile.dart';
 export 'title.dart';
+export 'victory.dart';

lib/view/widgets/victory.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+
+class Victory extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        Padding(
+          padding: const EdgeInsets.all(16.0),
+          child: Text(
+            AppLocalizations.of(context)!.victory_title,
+            style: Theme.of(context).textTheme.headline2!,
+          ),
+        ),
+        ElevatedButton(
+          child: Text(AppLocalizations.of(context)!.restart_btn),
+          onPressed: () {
+            Navigator.pop(context);
+          },
+        ),
+      ],
+    );
+  }
+}