Add callbacks

yaboli/callbacks.py

@@ -0,0 +1,50 @@
+class Callbacks():
+	"""
+	Manage callbacks
+	"""
+	
+	def __init__(self):
+		self._callbacks = {}
+	
+	def add(self, event, callback):
+		"""
+		add(event, callback) -> None
+		
+		Add a function to be called on event.
+		Certain arguments might be added on call, depending on the event.
+		"""
+		
+		if not event in self._callbacks:
+			self._callbacks[event] = []
+		
+		self._callbacks[event].append(callback)
+	
+	def remove(self, event):
+		"""
+		remove(event) -> None
+		
+		Remove all callbacks added to that event.
+		"""
+		
+		if event in self._callbacks:
+			del self._callbacks[event]
+	
+	def call(self, event, *args, **kwargs):
+		"""
+		call(event) -> None
+		
+		Call all callbacks subscribed to the event with the arguments passed to this function.
+		"""
+		
+		if event in self._callbacks:
+			for c in self._callbacks:
+				c(*args, **kwargs)
+	
+	def exists(self, event):
+		"""
+		exists(event) -> bool
+		
+		Are any functions subscribed to this event?
+		"""
+		
+		return event in self._callbacks