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71 lines
2.6 KiB
Python
71 lines
2.6 KiB
Python
# Copyright (c) 2014, Max Zwiessele
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# Licensed under the BSD 3-clause license (see LICENSE.txt)
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class Observable(object):
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"""
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Observable pattern for parameterization.
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This Object allows for observers to register with self and a (bound!) function
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as an observer. Every time the observable changes, it sends a notification with
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self as only argument to all its observers.
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"""
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def __init__(self, *args, **kwargs):
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super(Observable, self).__init__()
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from .lists_and_dicts import ObserverList
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self.observers = ObserverList()
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self._update_on = True
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def set_updates(self, on=True):
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self._update_on = on
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def add_observer(self, observer, callble, priority=0):
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"""
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Add an observer `observer` with the callback `callble`
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and priority `priority` to this observers list.
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"""
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self.observers.add(priority, observer, callble)
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def remove_observer(self, observer, callble=None):
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"""
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Either (if callble is None) remove all callables,
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which were added alongside observer,
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or remove callable `callble` which was added alongside
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the observer `observer`.
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"""
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to_remove = []
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for poc in self.observers:
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_, obs, clble = poc
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if callble is not None:
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if (obs is observer) and (callble == clble):
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to_remove.append(poc)
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else:
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if obs is observer:
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to_remove.append(poc)
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for r in to_remove:
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self.observers.remove(*r)
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def notify_observers(self, which=None, min_priority=None):
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"""
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Notifies all observers. Which is the element, which kicked off this
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notification loop. The first argument will be self, the second `which`.
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NOTE: notifies only observers with priority p > min_priority!
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^^^^^^^^^^^^^^^^
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:param min_priority: only notify observers with priority > min_priority
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if min_priority is None, notify all observers in order
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"""
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if self._update_on:
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if which is None:
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which = self
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if min_priority is None:
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[callble(self, which=which) for _, _, callble in self.observers]
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else:
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for p, _, callble in self.observers:
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if p <= min_priority:
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break
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callble(self, which=which)
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def change_priority(self, observer, callble, priority):
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self.remove_observer(observer, callble)
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self.add_observer(observer, callble, priority)
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