Simple picture output

global_state.py

@@ -1,3 +1,22 @@
+import logging
+from collections import defaultdict
+
 class GlobalState:
     def __init__(self):
-        pass
+        self.listeners = defaultdict(list)
+
+    def subscribe(self, event_name: str, callback):
+        """Register a function to be called when an event is dispatched."""
+        logging.info(f"Subscribing '{callback.__qualname__}' to event '{event_name}'")
+        self.listeners[event_name].append(callback)
+
+    def dispatch(self, event_name: str, *args, **kwargs):
+        """Call all registered callbacks for a given event."""
+        logging.info(f"Dispatching event '{event_name}' with data: {kwargs}")
+        if event_name in self.listeners:
+            for callback in self.listeners[event_name]:
+                try:
+                    # Pass the arguments and keyword arguments to the callback
+                    callback(*args, **kwargs)
+                except Exception as e:
+                    logging.error(f"Error in event callback for '{event_name}': {e}")