mirror of https://github.com/python/cpython
41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
"""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.
|
|
"""
|
|
|
|
class Switchboard:
|
|
def __init__(self, colordb):
|
|
self.__views = []
|
|
self.__colordb = colordb
|
|
self.__red = 0
|
|
self.__green = 0
|
|
self.__blue = 0
|
|
|
|
def add_view(self, view):
|
|
self.__views.append(view)
|
|
|
|
def update_views(self, red, green, blue):
|
|
self.__red = red
|
|
self.__green = green
|
|
self.__blue = blue
|
|
for v in self.__views:
|
|
v.update_yourself(red, green, blue)
|
|
|
|
def update_views_current(self):
|
|
self.update_views(self.__red, self.__green, self.__blue)
|
|
|
|
def current_rgb(self):
|
|
return self.__red, self.__green, self.__blue
|
|
|
|
def colordb(self):
|
|
return self.__colordb
|