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annotate light9/observable.py @ 1536:7a85229d07a0

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currentgraphstate now returns readonly (not actually snapshotted) view of the graph, not a copy Ignore-this: 7db0291740fe8dee0ad25b24571b171b
author Drew Perttula <drewp@bigasterisk.com>
date Thu, 11 May 2017 05:20:15 +0000
parents 7445bcd3349d
children 7772cc48e016
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7445bcd3349d observable.py use logging not print
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1 import logging
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2 log = logging.getLogger('observable')
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3
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4 class _NoNewVal(object):
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5 pass
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6
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7 class Observable(object):
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8 """
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9 like knockout's observable. Hopefully this can be replaced by a
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10 better python one
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11
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12 compare with:
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13 http://knockoutjs.com/documentation/observables.html
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14 https://github.com/drpancake/python-observable/blob/master/observable/observable.py
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15 """
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16 def __init__(self, val):
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17 self.val = val
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18 self.subscribers = set()
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19
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20 def __call__(self, newVal=_NoNewVal):
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21 if newVal is _NoNewVal:
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22 return self.val
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23 if newVal == self.val:
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7445bcd3349d observable.py use logging not print
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24 log.debug("%r unchanged from %r", newVal, self.val)
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25 return
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26 self.val = newVal
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27 for s in self.subscribers:
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28 s(newVal)
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29
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30 def subscribe(self, cb, callNow=True):
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31 """cb is called with new values, and also right now with the
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32 current value unless you opt out"""
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33 self.subscribers.add(cb)
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34 if callNow:
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35 cb(self.val)