update tests: new scene API

tests/demo/screens/base.py

@@ -9,7 +9,7 @@ class DemoScreen:
 
     def __init__(self, scene_name):
         self.scene_name = scene_name
-        mcrfpy.createScene(scene_name)
+        _scene = mcrfpy.Scene(scene_name)
         self.ui = mcrfpy.sceneUI(scene_name)
 
     def setup(self):

tests/demo/screens/focus_system_demo.py

@@ -600,8 +600,8 @@ def create_demo_scene():
     """Create and populate the focus system demo scene."""
 
     # Create scene
-    mcrfpy.createScene("focus_demo")
-    ui = mcrfpy.sceneUI("focus_demo")
+    focus_demo = mcrfpy.Scene("focus_demo")
+    ui = focus_demo.children
 
     # Background
     bg = mcrfpy.Frame(
@@ -752,10 +752,10 @@ def create_demo_scene():
             status_text.text = "No widget focused"
 
     # Activate scene first (keypressScene sets handler for CURRENT scene)
-    mcrfpy.setScene("focus_demo")
+    focus_demo.activate()
 
     # Register key handler for the now-current scene
-    mcrfpy.keypressScene(on_key)
+    focus_demo.on_key = on_key
 
     # Set initial focus
     focus_mgr.focus(0)