style: refactored level into smaller methods

lib/screens/level.dart

@@ -72,13 +72,61 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
             _position = value;
           }),
         );
-    _durationSubscription = player.onDurationChanged.listen((duration) {
+
+    // listen for new values from player
+    _durationSubscription =
+        player.onDurationChanged.listen((Duration duration) {
       setState(() => _duration = duration);
     });
 
+    _positionSubscription =
+        player.onPositionChanged.listen((Duration position) {
+      setState(() => _position = position);
+      for (final note in notes) {
+        _noteHitCheck(note, position);
+      }
+    });
+
+    player.onPlayerComplete.listen((void _) {
+      Route route = MaterialPageRoute(
+          builder: (context) => GameOverStats(
+                simfile: widget.simfile,
+                notes: notes,
+              ));
+      Navigator.pushReplacement(context, route);
+    });
+
+    // listen for esense button and pause/resume
     if (ESenseInput.instance.connected) {
       _buttonSubscription = ESenseInput.instance.buttonEvents().listen((event) {
         if (!event.pressed) {
+          _pauseResume();
+        }
+      });
+    }
+
+    widget.simfile.chartSimplest?.beats.forEach((time, noteData) {
+      int arrowIndex = noteData.indexOf('1');
+      if (arrowIndex < 0 || arrowIndex > 3) {
+        return;
+      }
+      notes.add(Note(time: time, direction: ArrowDirection.values[arrowIndex]));
+    });
+
+    player.play(DeviceFileSource(widget.simfile.audioPath!));
+  }
+
+  @override
+  void dispose() {
+    _animationController.dispose();
+    _durationSubscription?.cancel();
+    _positionSubscription?.cancel();
+    _buttonSubscription?.cancel();
+    player.dispose();
+    super.dispose();
+  }
+
+  void _pauseResume() {
     if (_isPlaying) {
       player.pause();
       setState(() {
@@ -91,34 +139,11 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
       });
     }
   }
-      });
-    }
 
-    _positionSubscription = player.onPositionChanged.listen(
-      (p) => setState(() => _position = p),
-    );
-
-    player.onDurationChanged.listen((Duration d) {
-      // print('Max duration: $d');
-      setState(() => _duration = d);
-    });
-
-    player.onPlayerComplete.listen((void _) {
-      Route route = MaterialPageRoute(
-          builder: (context) => GameOverStats(
-                simfile: widget.simfile,
-                notes: notes,
-              ));
-      Navigator.pushReplacement(context, route);
-    });
-
-    player.onPositionChanged.listen((Duration p) {
-      // print('Current position: $p');
-      setState(() => _position = p);
-      for (final note in notes) {
-        note.position = note.time - p.inMilliseconds / 60000.0;
+  void _noteHitCheck(Note note, Duration time) {
+    note.position = note.time - time.inMilliseconds / 60000.0;
     if (note.wasHit != null) {
-          continue;
+      return;
     }
     if (note.position.abs() < 0.5 * 1.0 / 60.0) {
       InputDirection esenseDirection =
@@ -163,25 +188,8 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
       });
     }
   }
-    });
 
-    widget.simfile.chartSimplest!.beats.forEach((time, noteData) {
-      int arrowIndex = noteData.indexOf('1');
-      if (arrowIndex < 0 || arrowIndex > 3) {
-        return;
-      }
-      notes.add(Note(time: time, direction: ArrowDirection.values[arrowIndex]));
-    });
-
-    player.play(DeviceFileSource(widget.simfile.audioPath!));
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return KeyboardListener(
-      focusNode: _focusNode,
-      autofocus: true,
-      onKeyEvent: (event) {
+  void _keyboardHandler(event) {
     bool isDown = false;
     if (event is KeyDownEvent) {
       isDown = true;
@@ -204,24 +212,19 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
         inputDirection.right = isDown;
         break;
     }
-      },
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return KeyboardListener(
+      focusNode: _focusNode,
+      autofocus: true,
+      onKeyEvent: _keyboardHandler,
       child: Scaffold(
           appBar: AppBar(
             leading: IconButton(
               icon: Icon(_isPlaying ? Icons.pause : Icons.play_arrow),
-              onPressed: () {
-                if (_isPlaying) {
-                  player.pause();
-                  setState(() {
-                    _isPlaying = false;
-                  });
-                } else {
-                  player.resume();
-                  setState(() {
-                    _isPlaying = true;
-                  });
-                }
-              },
+              onPressed: _pauseResume,
             ),
             title: Text(widget.simfile.tags['TITLE']!),
             actions: [
@@ -273,14 +276,4 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
           ])),
     );
   }
-
-  @override
-  void dispose() {
-    _animationController.dispose();
-    _durationSubscription?.cancel();
-    _positionSubscription?.cancel();
-    _buttonSubscription?.cancel();
-    player.dispose();
-    super.dispose();
-  }
 }