captouch demo: fixed OS integration issues

note to self don't just test with mpremote run :3

python_payload/apps/demo_cap_touch/__init__.py

@@ -39,11 +39,14 @@ class CapTouchDemo(Application):
         self.last_calib = None
         self.state = 0
         self.timer = 0
-        self.button = 0
+        self.button = None
 
     def think(self, ins: InputState, delta_ms: int) -> None:
         super().think(ins, delta_ms)
+        if self.button is not None:
             press_event = (self.button != ins.buttons.app) and ins.buttons.app
+        else:
+            press_event = False
         self.button = int(ins.buttons.app)
         if press_event:
             print(self.button)
@@ -116,6 +119,10 @@ class CapTouchDemo(Application):
                 ctx.rgb(1.0, 0.5, 0.2)
                 ctx.text("calibrating...")
 
+    def on_enter(self, vm: Optional[ViewManager]) -> None:
+        super().on_enter(vm)
+        self.button = None
+
 
 # For running with `mpremote run`:
 if __name__ == "__main__":

python_payload/apps/demo_cap_touch/flow3r.toml

@@ -3,7 +3,7 @@ name = "captouch demo"
 category = "Apps"
 
 [entry]
-class = "App"
+class = "CapTouchDemo"
 
 [metadata]
 author = "Flow3r Badge Authors"