diff options
Diffstat (limited to 'lib/python/Components')
| -rw-r--r-- | lib/python/Components/Element.py | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/python/Components/Element.py b/lib/python/Components/Element.py index 6f812b20..fc709139 100644 --- a/lib/python/Components/Element.py +++ b/lib/python/Components/Element.py @@ -25,6 +25,24 @@ class Element: self.connectUpstream(upstream) upstream.connectDownstream(self) + # we disconnect from down to up + def disconnectAll(self): + # 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) + + def disconnectDownstream(self, downstream): + self.downstream_elements.remove(downstream) + if self.master == downstream: + self.master = None + + if len(self.downstream_elements) == 0: + self.disconnectAll() + # default action: push downstream def changed(self): self.downstream_elements.changed() |