add Event

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/python/Tools/Event.py b/lib/python/Tools/Event.py
new file mode 100644
index 00000000..6b96bff4
--- /dev/null
+++ b/lib/python/Tools/Event.py
@@ -0,0 +1,23 @@
+
+class Event:
+	def __init__(self, start = None, stop = None):
+		self.list = [ ]
+		self.start = start
+		self.stop = stop
+	
+	def __call__(self, *args, **kwargs):
+		for x in self.list:
+			x(*args, **kwargs)
+
+	def listen(self, fnc):
+		was_empty = len(self.list) == 0
+		self.list.append(fnc)
+		if was_empty:
+			if self.start:
+				self.start()
+
+	def unlisten(self, fnc):
+		self.list.remove(fnc)
+		if len(self.list) == 0:
+			if self.stop:
+				self.stop()