In the interest of simplifying/unifying the API for callbacks in mpl, I ported the cm.ScalarMappable callback API to the cbook.CallbackRegistry functionality which is what we use (on the trunk) for the toolbar event handling and the Axes xlim/ylim notification. At a minimum, all callbacks (with one exception that I am aware of in widgets.py) in mpl are now handled with the cbook.CallbackRegistry, which is a start. backend_driver.py is passing as are a few interactive tests I tried, but make sure it looks OK on your end.
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