X-Git-Url: https://git.cweiske.de/enigma2.git/blobdiff_plain/9d3112aad388b4369a339b851aa2507a02bb2d4f..cd3cd96e2ff4c6e6a9a38393e4d93167d30f74ea:/lib/python/Components/Element.py

diff --git a/lib/python/Components/Element.py b/lib/python/Components/Element.py
index baab4cfb..f4a8f127 100644
--- a/lib/python/Components/Element.py
+++ b/lib/python/Components/Element.py
@@ -8,13 +8,21 @@ from Tools.CList import CList
 def cached(f):
 	name = f.__name__
 	def wrapper(self):
-		if self.cache is None:
+		cache = self.cache
+		if cache is None:
 			return f(self)
-		if name not in self.cache:
-			self.cache[name] = (True, f(self))
-		return self.cache[name][1]
+		if name not in cache:
+			cache[name] = (True, f(self))
+		return cache[name][1]
 	return wrapper
 
+class ElementError(Exception):
+    def __init__(self, message):
+        self.message = message
+
+    def __str__(self):
+        return self.message
+
 class Element(object):
 	CHANGED_DEFAULT = 0   # initial "pull" state
 	CHANGED_ALL = 1       # really everything changed
@@ -48,11 +56,13 @@ class Element(object):
 		# we should not disconnect from upstream if
 		# there are still elements depending on us.
 		assert len(self.downstream_elements) == 0, "there are still downstream elements left"
-		
+
 		# Sources don't have a source themselves. don't do anything here.
 		if self.source is not None:
 			self.source.disconnectDownstream(self)
-	
+			# sources are owned by the Screen, so don't destroy them here.
+			self.destroy()
+
 	def disconnectDownstream(self, downstream):
 		self.downstream_elements.remove(downstream)
 		if self.master == downstream:
@@ -89,3 +99,6 @@ class Element(object):
 
 	def doSuspend(self, suspend):
 		pass
+
+	def destroy(self):
+		pass