| """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 |