def changed(context):
logger.debug("Context %s changed" % context)
# TODO: wrap in try/except
if context.evaluateRules():
if context not in current_contexts:
current_contexts.add(context)
notify.enter(context)
context.runEnteringActions()
else:
if context in current_contexts:
current_contexts.remove(context)
notify.leave(context)
context.runLeavingActions()
def reevaluate():
old_contexts = current_contexts.copy()
current_contexts.clear()
for c in contexts.itervalues():
if c.evaluateRules():
current_contexts.add(c)
# Run leave before enter
for c in old_contexts.difference(current_contexts):
notify.leave(c)
c.runLeavingActions()
for c in current_contexts.difference(old_contexts):
notify.enter(c)
c.runEnteringActions()
