cpython/Tools/pynche/Switchboard.py

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"""Switchboard class.
This class is used to coordinate updates among all Viewers. Every Viewer must
conform to the following interface:
- it must include a method called update_yourself() which takes three
arguments; the red, green, and blue values of the selected color.
- When a Viewer selects a color and wishes to update all other Views, it
should call update_views() on the Switchboard object. Not that the
Viewer typically does *not* update itself before calling update_views(),
since this would cause it to get updated twice.
"""
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class Switchboard:
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def __init__(self, colordb):
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self.__views = []
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self.__colordb = colordb
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self.__red = 0
self.__green = 0
self.__blue = 0
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def add_view(self, view):
self.__views.append(view)
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def update_views(self, red, green, blue):
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self.__red = red
self.__green = green
self.__blue = blue
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for v in self.__views:
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v.update_yourself(red, green, blue)
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def update_views_current(self):
self.update_views(self.__red, self.__green, self.__blue)
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def current_rgb(self):
return self.__red, self.__green, self.__blue
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def colordb(self):
return self.__colordb