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1 """each node type has an Op within it"""
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2
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3 class Op:
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4 """nodes can have several versions of their operation function.
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5
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6 ops don't return anything!
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7 """
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8 def __init__(self):
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9 """This should not be overridden without being called."""
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10 pass
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11
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12 def inputschanged(self, input, output, stateaccess):
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13 """If you only define one op function body, make it this one. """
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14 pass
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15
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16 def created(self, input, output, stateaccess):
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17 """This is called one time when the node is newly created. It's
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18 not called when the node instance is pickled/unpickled. Use this
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19 version to initialize state."""
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20 # an extra call to changed() should help the outputs get set
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21 # correctly before any real inputs-changed events come around
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22 # (assuming this method doesn't get overridden with a
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23 # specialized version)
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24 self.inputschanged(input, output, stateaccess)
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25
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26 def statechanged(self, input, output, stateaccess):
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27 '''State might have been changed by a user dragging a parameter or by
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28 a state being hcanged otherwise.'''
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29 self.inputschanged(input, output, stateaccess)
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30
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31 def clocked(self, input, output, stateaccess):
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32 self.inputschanged(input, output, stateaccess)
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