Implement everything

Thanks claude!"

lib/main.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'dart:async';
+import 'package:flutter/services.dart';
 
 void main() {
   runApp(const MyApp());
@@ -27,13 +29,180 @@ class MyHomePage extends StatefulWidget {
 }
 
 class _MyHomePageState extends State<MyHomePage> {
+  Timer? _timer;
+  DateTime? _startTime;
+  DateTime? _pauseTime;
+  Duration _elapsedTime = Duration.zero;
+  bool _isRunning = false;
+  List<String> _laps = [];
+  final FocusNode _focusNode = FocusNode();
+
+  void _startTimer() {
+    final now = DateTime.now();
+    if (_pauseTime != null) {
+      // Resuming from pause
+      final pausedDuration = now.difference(_pauseTime!);
+      _startTime = _startTime?.add(pausedDuration);
+      _pauseTime = null;
+    } else {
+      // Starting fresh
+      _startTime = now;
+      _elapsedTime = Duration.zero;
+      _laps = [];
+    }
+    
+    _timer = Timer.periodic(const Duration(milliseconds: 100), (timer) {
+      setState(() {
+        _elapsedTime = DateTime.now().difference(_startTime!);
+      });
+    });
+    
+    setState(() {
+      _isRunning = true;
+    });
+  }
+
+  void _pauseTimer() {
+    _timer?.cancel();
+    _pauseTime = DateTime.now();
+    setState(() {
+      _isRunning = false;
+    });
+  }
+
+  void _stopTimer() {
+    _timer?.cancel();
+    setState(() {
+      _isRunning = false;
+      _startTime = null;
+      _pauseTime = null;
+      _elapsedTime = Duration.zero;
+    });
+  }
+
+  void _recordLap() {
+    if (_isRunning) {
+      final now = DateTime.now();
+      setState(() {
+        _laps.add(now.toIso8601String());
+      });
+    }
+  }
+
+  String _formatDuration(Duration duration) {
+    // Format the duration as ISO 8601 duration format: PT[hours]H[minutes]M[seconds]S
+    final hours = duration.inHours;
+    final minutes = duration.inMinutes.remainder(60);
+    final seconds = duration.inSeconds.remainder(60);
+    final milliseconds = duration.inMilliseconds.remainder(1000);
+    
+    return 'PT${hours}H${minutes}M${seconds}.${milliseconds}S';
+  }
+
+  void _handleKeyEvent(RawKeyEvent event) {
+    if (event is RawKeyDownEvent) {
+      if (event.logicalKey == LogicalKeyboardKey.space) {
+        // Space: Start if paused, Lap if running
+        if (_isRunning) {
+          _recordLap();
+        } else {
+          _startTimer();
+        }
+      } else if (event.logicalKey == LogicalKeyboardKey.enter) {
+        // Enter: Stop if paused, Pause if running
+        if (_isRunning) {
+          _pauseTimer();
+        } else {
+          _stopTimer();
+        }
+      }
+    }
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _focusNode.requestFocus();
+  }
+
+  @override
+  void dispose() {
+    _timer?.cancel();
+    _focusNode.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return RawKeyboardListener(
+      focusNode: _focusNode,
+      onKey: _handleKeyEvent,
+      autofocus: true,
+      child: Scaffold(
         appBar: AppBar(
           backgroundColor: Theme.of(context).colorScheme.inversePrimary,
           title: Text(widget.title),
         ),
+        body: Center(
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              Text(
+                'Time Elapsed:',
+                style: Theme.of(context).textTheme.headlineSmall,
+              ),
+              const SizedBox(height: 10),
+              Text(
+                _formatDuration(_elapsedTime),
+                style: Theme.of(context).textTheme.headlineMedium,
+              ),
+              const SizedBox(height: 30),
+              Row(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  ElevatedButton(
+                    onPressed: _isRunning ? _pauseTimer : _startTimer,
+                    child: Text(_isRunning ? 'Pause' : 'Start'),
+                  ),
+                  const SizedBox(width: 20),
+                  ElevatedButton(
+                    onPressed: _stopTimer,
+                    child: const Text('Stop'),
+                  ),
+                  const SizedBox(width: 20),
+                  ElevatedButton(
+                    onPressed: _recordLap,
+                    child: const Text('Lap'),
+                  ),
+                ],
+              ),
+              const SizedBox(height: 10),
+              Text(
+                'Keyboard: SPACE for Start/Lap, ENTER for Pause/Stop',
+                style: Theme.of(context).textTheme.bodySmall,
+              ),
+              const SizedBox(height: 20),
+              if (_laps.isNotEmpty) ...[
+                Text(
+                  'Laps:',
+                  style: Theme.of(context).textTheme.titleLarge,
+                ),
+                const SizedBox(height: 10),
+                Expanded(
+                  child: ListView.builder(
+                    itemCount: _laps.length,
+                    itemBuilder: (context, index) {
+                      return ListTile(
+                        title: Text('Lap ${index + 1}: ${_laps[index]}'),
+                      );
+                    },
+                  ),
+                ),
+              ],
+            ],
+          ),
+        ),
+      ),
     );
   }
 }