This looks like a very specific and inflexible solution to a very general problem. What if UI Router and UI Map are combined with another module that controls template rendering (let's say, a tab directive)? Now you have to listen for two events. What if they don't agree about whether the map should be rendered? What if the order of events is nondeterministic?

👎 from me. A logical approach would use a $watch() to check that the container element is visible and has bounds and an offset.