| 1 | """Switchboard class.
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| 2 |
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| 3 | This class is used to coordinate updates among all Viewers. Every Viewer must
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| 4 | conform to the following interface:
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| 5 |
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| 6 | - it must include a method called update_yourself() which takes three
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| 7 | arguments; the red, green, and blue values of the selected color.
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| 8 |
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| 9 | - When a Viewer selects a color and wishes to update all other Views, it
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| 10 | should call update_views() on the Switchboard object. Note that the
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| 11 | Viewer typically does *not* update itself before calling update_views(),
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| 12 | since this would cause it to get updated twice.
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