final cog

class Debounce(object):
    def __init__(self, steps=10, state=True):
        self.MAX_STEP = steps - 1
        self.state = state
        self.value = state and self.MAX_STEP or 0
        self.onFalse = []   # list of callbacks for state transitions
        self.onTrue = []
 
    def inc(self, steps=1):
        self.value = self.value + steps
        if (self.value <= 0 and self.state == True):
            self.state = False
            for fn in self.onFalse:
                fn()
        if (self.value >= self.MAX_STEP and self.state == False):
            self.state = True
            for fn in self.onTrue:
                fn()
 
        if (self.value < 0):
            self.value = 0
        if (self.value > self.MAX_STEP):
            self.value = self.MAX_STEP
 
    def dec(self, steps=1):
        self.inc(-steps)

#!/usr/bin/python
 
from debounce import Debounce
 
def callbackFalse():
    print "state changed to False"
 
def callbackTrue():
    print "state changed to True"
 
debounce = Debounce(5)
debounce.onFalse.append(callbackFalse)
debounce.onTrue.append(callbackTrue)
 
debounce.dec()
debounce.dec()
debounce.dec()
debounce.dec()
debounce.dec()
debounce.dec()
debounce.dec(20)
debounce.inc()
debounce.inc()
debounce.inc()
debounce.inc()
debounce.inc()