refactor(analogin): split components into submodule

Author: xs5871

docs/en/analogin.md

@@ -92,7 +92,7 @@ AE = AnalogEvent(
 A "convenience" implementation of `AnalogEvent` that emits `Key` objects.
 
 ```python
-from analogio import AnalogKey
+from kmk.modules.analogin.keys import AnalogKey
 
 AK = AnalogKey(
     key: Key,
@@ -108,6 +108,7 @@ AK = AnalogKey(
 import board
 from analogio import AnalogIn
 from kmk.modules.analogin import AnalogInput, AnalogInputs
+from kmk.modules.analogin.keys import AnalogKey
 
 analog = AnalogInputs(
     [

kmk/modules/analogin.py kmk/modules/analogin/__init__.py

@@ -0,0 +1,20 @@
+from . import AnalogEvent
+
+
+class AnalogKey(AnalogEvent):
+    def __init__(self, key, threshold=127):
+        self.key = key
+        self.threshold = threshold
+        self.pressed = False
+
+    def on_change(self, event, keyboard):
+        if event.value >= self.threshold and not self.pressed:
+            self.pressed = True
+            keyboard.pre_process_key(self.key, True)
+
+        elif event.value < self.threshold and self.pressed:
+            self.pressed = False
+            keyboard.pre_process_key(self.key, False)
+
+    def on_stop(self, event, keyboard):
+        pass