1 files changed, 73 insertions, 0 deletions
diff --git a/lib/playground_page.dart b/lib/playground_page.dart
new file mode 100644
index 0000000..3c090ac
--- /dev/null
+++ b/lib/playground_page.dart
@@ -0,0 +1,73 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/widgets.dart';
+import 'app_bar.dart';
+import 'button.dart';
+import 'value_display.dart';
+
+class PlaygroundPage extends StatefulWidget {
+  const PlaygroundPage({super.key});
+
+  @override
+  State<PlaygroundPage> createState() => _PlaygroundPageState();
+}
+
+class _PlaygroundPageState extends State<PlaygroundPage> {
+  int _counter = 0;
+  int _elapsedMilliseconds = 0;
+  final stopwatch = Stopwatch();
+
+  void increment() {
+    setState(() {
+      ++_counter;
+      if (stopwatch.isRunning) {
+        stopwatch.stop();
+        _elapsedMilliseconds = stopwatch.elapsedMilliseconds;
+        stopwatch.reset();
+      }
+      else {
+        stopwatch.start();
+        _elapsedMilliseconds = 0;
+      }
+    });
+  }
+
+  void clear() {
+    setState(() {
+      if (stopwatch.isRunning) {
+        return;
+      }
+      _counter = 0;
+      _elapsedMilliseconds = 0;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        const AppBar(),
+        Expanded(
+          child: Center(
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: <Widget> [ 
+                Column(
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: [
+                    Button(onPressed: increment, buttonText: 'Increment'),
+                    const SizedBox(height: 8),
+                    Button(onPressed: clear, buttonText: 'Clear'),
+                  ],
+                ),
+                const SizedBox(width: 16), 
+                ValueDisplay(label: 'Count', value: _counter),
+                const SizedBox(width: 16),
+                ValueDisplay(label: 'Elapsed (ms)', value: _elapsedMilliseconds),
+              ],
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+}