diff options
Diffstat (limited to 'lib/python/Components/Element.py')
| -rw-r--r-- | lib/python/Components/Element.py | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/lib/python/Components/Element.py b/lib/python/Components/Element.py index 880274b4..12218466 100644 --- a/lib/python/Components/Element.py +++ b/lib/python/Components/Element.py @@ -5,10 +5,17 @@ from Tools.CList import CList # a bidirectional connection class Element: + CHANGED_DEFAULT = 0 # initial "pull" state + CHANGED_ALL = 1 # really everything changed + CHANGED_CLEAR = 2 # we're expecting a real update soon. don't bother polling NOW, but clear data. + CHANGED_SPECIFIC = 3 # second tuple will specify what exactly changed + CHANGED_POLL = 4 # a timer expired + def __init__(self): self.downstream_elements = CList() self.master = None self.source = None + self.clearCache() def connectDownstream(self, downstream): self.downstream_elements.append(downstream) @@ -18,7 +25,7 @@ class Element: def connectUpstream(self, upstream): assert self.source is None self.source = upstream - self.changed() + self.changed((self.CHANGED_DEFAULT,)) def connect(self, upstream): self.connectUpstream(upstream) @@ -44,8 +51,13 @@ class Element: # default action: push downstream def changed(self, *args, **kwargs): + self.clearCache() self.downstream_elements.changed(*args, **kwargs) + self.clearCache() def reconnectUpstream(self, new_upstream): assert self.source is not None self.source = new_upstream + + def clearCache(self): + self.cache = None |