style: refactored level into smaller methods

lib/screens/level.dart

@@ -72,35 +72,19 @@ 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);
     });
 
-    if (ESenseInput.instance.connected) {
+    _positionSubscription =
-      _buttonSubscription = ESenseInput.instance.buttonEvents().listen((event) {
+        player.onPositionChanged.listen((Duration position) {
-        if (!event.pressed) {
+      setState(() => _position = position);
-          if (_isPlaying) {
+      for (final note in notes) {
-            player.pause();
+        _noteHitCheck(note, position);
-            setState(() {
+      }
-              _isPlaying = false;
-            });
-          } else {
-            player.resume();
-            setState(() {
-              _isPlaying = true;
-            });
-          }
-        }
-      });
-    }
-
-    _positionSubscription = player.onPositionChanged.listen(
-      (p) => setState(() => _position = p),
-    );
-
-    player.onDurationChanged.listen((Duration d) {
-      // print('Max duration: $d');
-      setState(() => _duration = d);
     });
 
     player.onPlayerComplete.listen((void _) {
@@ -112,60 +96,16 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
       Navigator.pushReplacement(context, route);
     });
 
-    player.onPositionChanged.listen((Duration p) {
+    // listen for esense button and pause/resume
-      // print('Current position: $p');
+    if (ESenseInput.instance.connected) {
-      setState(() => _position = p);
+      _buttonSubscription = ESenseInput.instance.buttonEvents().listen((event) {
-      for (final note in notes) {
+        if (!event.pressed) {
-        note.position = note.time - p.inMilliseconds / 60000.0;
+          _pauseResume();
-        if (note.wasHit != null) {
-          continue;
         }
-        if (note.position.abs() < 0.5 * 1.0 / 60.0) {
+      });
-          InputDirection esenseDirection =
+    }
-              ESenseInput.instance.getInputDirection(note.direction);
-          inputDirection.up |= esenseDirection.up;
-          inputDirection.down |= esenseDirection.down;
-          inputDirection.left |= esenseDirection.left;
-          inputDirection.right |= esenseDirection.right;
-          bool keypressCorrect = false;
-          switch (note.direction) {
-            case ArrowDirection.up:
-              keypressCorrect = inputDirection.up;
-              break;
-            case ArrowDirection.down:
-              keypressCorrect = inputDirection.down;
-              break;
-            case ArrowDirection.right:
-              keypressCorrect = inputDirection.right;
-              break;
-            case ArrowDirection.left:
-              keypressCorrect = inputDirection.left;
-              break;
-          }
-          if (keypressCorrect) {
-            print("you hit!");
-            note.wasHit = true;
-            _animationController.reset();
-            _animationController.forward();
-            inputDirection.reset();
-            setState(() {
-              hitOrMissMessage = 'Great!';
-            });
-          }
-        } else if (note.position < -0.5 * 1.0 / 60.0) {
-          print("Missed");
-          note.wasHit = false;
-          _animationController.reset();
-          _animationController.forward();
-          inputDirection.reset();
-          setState(() {
-            hitOrMissMessage = 'Missed';
-          });
-        }
-      }
-    });
 
-    widget.simfile.chartSimplest!.beats.forEach((time, noteData) {
+    widget.simfile.chartSimplest?.beats.forEach((time, noteData) {
       int arrowIndex = noteData.indexOf('1');
       if (arrowIndex < 0 || arrowIndex > 3) {
         return;
@@ -176,52 +116,115 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
     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(() {
+        _isPlaying = false;
+      });
+    } else {
+      player.resume();
+      setState(() {
+        _isPlaying = true;
+      });
+    }
+  }
+
+  void _noteHitCheck(Note note, Duration time) {
+    note.position = note.time - time.inMilliseconds / 60000.0;
+    if (note.wasHit != null) {
+      return;
+    }
+    if (note.position.abs() < 0.5 * 1.0 / 60.0) {
+      InputDirection esenseDirection =
+          ESenseInput.instance.getInputDirection(note.direction);
+      inputDirection.up |= esenseDirection.up;
+      inputDirection.down |= esenseDirection.down;
+      inputDirection.left |= esenseDirection.left;
+      inputDirection.right |= esenseDirection.right;
+      bool keypressCorrect = false;
+      switch (note.direction) {
+        case ArrowDirection.up:
+          keypressCorrect = inputDirection.up;
+          break;
+        case ArrowDirection.down:
+          keypressCorrect = inputDirection.down;
+          break;
+        case ArrowDirection.right:
+          keypressCorrect = inputDirection.right;
+          break;
+        case ArrowDirection.left:
+          keypressCorrect = inputDirection.left;
+          break;
+      }
+      if (keypressCorrect) {
+        print("you hit!");
+        note.wasHit = true;
+        _animationController.reset();
+        _animationController.forward();
+        inputDirection.reset();
+        setState(() {
+          hitOrMissMessage = 'Great!';
+        });
+      }
+    } else if (note.position < -0.5 * 1.0 / 60.0) {
+      print("Missed");
+      note.wasHit = false;
+      _animationController.reset();
+      _animationController.forward();
+      inputDirection.reset();
+      setState(() {
+        hitOrMissMessage = 'Missed';
+      });
+    }
+  }
+
+  void _keyboardHandler(event) {
+    bool isDown = false;
+    if (event is KeyDownEvent) {
+      isDown = true;
+    } else if (event is KeyUpEvent) {
+      isDown = false;
+    } else {
+      return;
+    }
+    switch (event.logicalKey) {
+      case LogicalKeyboardKey.arrowUp:
+        inputDirection.up = isDown;
+        break;
+      case LogicalKeyboardKey.arrowDown:
+        inputDirection.down = isDown;
+        break;
+      case LogicalKeyboardKey.arrowLeft:
+        inputDirection.left = isDown;
+        break;
+      case LogicalKeyboardKey.arrowRight:
+        inputDirection.right = isDown;
+        break;
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return KeyboardListener(
       focusNode: _focusNode,
       autofocus: true,
-      onKeyEvent: (event) {
+      onKeyEvent: _keyboardHandler,
-        bool isDown = false;
-        if (event is KeyDownEvent) {
-          isDown = true;
-        } else if (event is KeyUpEvent) {
-          isDown = false;
-        } else {
-          return;
-        }
-        switch (event.logicalKey) {
-          case LogicalKeyboardKey.arrowUp:
-            inputDirection.up = isDown;
-            break;
-          case LogicalKeyboardKey.arrowDown:
-            inputDirection.down = isDown;
-            break;
-          case LogicalKeyboardKey.arrowLeft:
-            inputDirection.left = isDown;
-            break;
-          case LogicalKeyboardKey.arrowRight:
-            inputDirection.right = isDown;
-            break;
-        }
-      },
       child: Scaffold(
           appBar: AppBar(
             leading: IconButton(
               icon: Icon(_isPlaying ? Icons.pause : Icons.play_arrow),
-              onPressed: () {
+              onPressed: _pauseResume,
-                if (_isPlaying) {
-                  player.pause();
-                  setState(() {
-                    _isPlaying = false;
-                  });
-                } else {
-                  player.resume();
-                  setState(() {
-                    _isPlaying = true;
-                  });
-                }
-              },
             ),
             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();
-  }
 }