From 373c0bf93fd9a183c121c30e8de509dd73c9cff5 Mon Sep 17 00:00:00 2001
From: FMorschel <52160996+FMorschel@users.noreply.github.com>
Date: Thu, 4 Sep 2025 23:42:00 -0300
Subject: [PATCH 1/2] Implement countdown timer and game over dialog in
 DashSweeper

---
 lib/dash_sweeper.dart | 89 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 86 insertions(+), 3 deletions(-)

diff --git a/lib/dash_sweeper.dart b/lib/dash_sweeper.dart
index 8cbce5e..e209dea 100644
--- a/lib/dash_sweeper.dart
+++ b/lib/dash_sweeper.dart
@@ -14,15 +14,36 @@ class DashSweeper extends StatefulWidget {
   State<DashSweeper> createState() => _DashSweeperState();
 }
 
-class _DashSweeperState extends State<DashSweeper> {
+class _DashSweeperState extends State<DashSweeper>
+    with TickerProviderStateMixin {
+  static const countdownMax = 3;
+
   late List<Tile> tiles;
+  late Animation<double> countdown;
+  late AnimationController countdownController;
+
+  bool paused = false;
 
   @override
   void initState() {
     super.initState();
+    countdownController = AnimationController(
+      vsync: this,
+      duration: Duration(seconds: countdownMax),
+    );
+    countdown = Tween<double>(
+      begin: countdownMax.toDouble(),
+      end: 0,
+    ).animate(countdownController);
     _generateTiles(widget.rows, widget.columns);
   }
 
+  @override
+  void dispose() {
+    countdownController.dispose();
+    super.dispose();
+  }
+
   void _generateTiles(int rows, int columns) {
     // calculate tiles
     final amount = rows * columns;
@@ -200,6 +221,10 @@ class _DashSweeperState extends State<DashSweeper> {
           .map((tile) => tile.copyWith(state: TileState.revealed))
           .toList(growable: false);
     });
+    _gameOverDialog();
+  }
+
+  void _gameOverDialog() {
     showDialog(
       context: context,
       barrierDismissible: false,
@@ -208,8 +233,8 @@ class _DashSweeperState extends State<DashSweeper> {
           title: Text('Game Over'),
           content: Text('Bummer...'),
           actions: [
-            OutlinedButton(
-              onPressed: () {},
+            ElevatedButton(
+              onPressed: _timerToDialog,
               child: Text('Show field'),
             ),
             ElevatedButton(
@@ -225,6 +250,17 @@ class _DashSweeperState extends State<DashSweeper> {
     );
   }
 
+  void _timerToDialog() {
+    Navigator.of(context).pop();
+    countdownController.forward(from: 0);
+    countdownController.addStatusListener((status) {
+      if (status == AnimationStatus.completed) {
+        if (mounted) _gameOverDialog();
+        countdownController.reset();
+      }
+    });
+  }
+
   /// Recursive function to get all empty tiles to reveal at once.
   Set<int> emptyTilesToReveal(
     int index, {
@@ -252,6 +288,53 @@ class _DashSweeperState extends State<DashSweeper> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
+      appBar: AppBar(
+        title: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Text('DashSweeper'),
+            AnimatedBuilder(
+              animation: countdown,
+              builder: (context, child) {
+                if (countdownController.value == 0) return SizedBox.shrink();
+                return Padding(
+                  padding: const EdgeInsets.only(left: 8.0),
+                  child: Stack(
+                    alignment: Alignment.center,
+                    children: [
+                      CircularProgressIndicator.adaptive(
+                        value: countdown.value / countdownMax,
+                      ),
+                      IconButton(
+                        onPressed: () {
+                          setState(() {
+                            paused = !paused;
+                          });
+                          if (paused) {
+                            countdownController.stop();
+                          } else {
+                            countdownController.forward();
+                          }
+                        },
+                        icon: Icon(
+                          paused ? Icons.play_arrow : Icons.pause,
+                        ),
+                      ),
+                    ],
+                  ),
+                );
+              },
+            ),
+          ],
+        ),
+        centerTitle: true,
+        actions: [
+          IconButton(
+            onPressed: _resetGame,
+            icon: Icon(Icons.refresh),
+          ),
+        ],
+      ),
       body: GridView.builder(
         gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
           crossAxisCount: widget.columns,

From 1b289736fcd5a6b583f3bdcca9f7e698fa0316f0 Mon Sep 17 00:00:00 2001
From: FMorschel <52160996+FMorschel@users.noreply.github.com>
Date: Thu, 4 Sep 2025 23:48:40 -0300
Subject: [PATCH 2/2] fixes edge cases

---
 lib/dash_sweeper.dart | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/dash_sweeper.dart b/lib/dash_sweeper.dart
index e209dea..0af1a9b 100644
--- a/lib/dash_sweeper.dart
+++ b/lib/dash_sweeper.dart
@@ -210,6 +210,8 @@ class _DashSweeperState extends State<DashSweeper>
   }
 
   void _resetGame() {
+    paused = false;
+    countdownController.reset();
     setState(() {
       _generateTiles(widget.rows, widget.columns);
     });
@@ -255,8 +257,10 @@ class _DashSweeperState extends State<DashSweeper>
     countdownController.forward(from: 0);
     countdownController.addStatusListener((status) {
       if (status == AnimationStatus.completed) {
-        if (mounted) _gameOverDialog();
-        countdownController.reset();
+        if (mounted && (ModalRoute.of(context)?.isCurrent ?? false)) {
+          _gameOverDialog();
+          countdownController.reset();
+        }
       }
     });
   }