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81 lines
2.5 KiB
Python
81 lines
2.5 KiB
Python
"""Switchboard class.
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This class is used to coordinate updates among all Viewers. Every Viewer must
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conform to the following interface:
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- it must include a method called update_yourself() which takes three
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arguments; the red, green, and blue values of the selected color.
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- When a Viewer selects a color and wishes to update all other Views, it
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should call update_views() on the Switchboard object. Not that the
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Viewer typically does *not* update itself before calling update_views(),
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since this would cause it to get updated twice.
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"""
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from types import DictType
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import marshal
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class Switchboard:
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def __init__(self, colordb, initfile):
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self.__colordb = colordb
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self.__optiondb = {}
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self.__views = []
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self.__red = 0
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self.__green = 0
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self.__blue = 0
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# read the initialization file
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fp = None
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if initfile:
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try:
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try:
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fp = open(initfile)
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self.__optiondb = marshal.load(fp)
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if type(self.__optiondb) <> DictType:
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print 'Problem reading options from file:', initfile
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self.__optiondb = {}
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except (IOError, EOFError):
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pass
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finally:
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if fp:
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fp.close()
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def add_view(self, view):
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self.__views.append(view)
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def update_views(self, red, green, blue):
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self.__red = red
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self.__green = green
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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):
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self.update_views(self.__red, self.__green, self.__blue)
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def current_rgb(self):
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return self.__red, self.__green, self.__blue
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def colordb(self):
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return self.__colordb
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def optiondb(self):
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return self.__optiondb
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def save_views(self, file):
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# save the current color
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self.__optiondb['RED'] = self.__red
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self.__optiondb['GREEN'] = self.__green
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self.__optiondb['BLUE'] = self.__blue
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for v in self.__views:
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v.save_options(self.__optiondb)
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fp = None
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try:
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try:
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fp = open(file, 'w')
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except IOError:
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print 'Cannot write options to file:', file
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else:
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marshal.dump(self.__optiondb, fp)
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finally:
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if fp:
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fp.close()
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