diff options
Diffstat (limited to 'lib/python/Components/Element.py')
| -rw-r--r-- | lib/python/Components/Element.py | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/lib/python/Components/Element.py b/lib/python/Components/Element.py index 5b8bed86..884c87d3 100644 --- a/lib/python/Components/Element.py +++ b/lib/python/Components/Element.py @@ -7,7 +7,6 @@ from Tools.CList import CList class Element: def __init__(self): self.downstream_elements = CList() - self.upstream_elements = CList() self.master = None self.source = None @@ -17,8 +16,8 @@ class Element: self.master = downstream def connectUpstream(self, upstream): - self.upstream_elements.append(upstream) - self.source = upstream # for single-source elements (i.e., most of them.) + assert self.source is None + self.source = upstream self.changed() def connect(self, upstream): @@ -30,10 +29,7 @@ class Element: # 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" - - # disconnect all upstream elements from us - for upstream in self.upstream_elements: - upstream.disconnectDownstream(self) + self.source.disconnectDownstream(self) def disconnectDownstream(self, downstream): self.downstream_elements.remove(downstream) @@ -46,3 +42,7 @@ class Element: # default action: push downstream def changed(self, *args, **kwargs): self.downstream_elements.changed(*args, **kwargs) + + def reconnectUpstream(self, new_upstream): + assert self.source is not None + self.source = new_upstream |