Interface for passive listeners on a map. These listeners receive notifications of mouse events on the map, but cannot interfere. That is why they receive a replacement event ( {@link ListenerEvent}) instead of the real mouse events.
The difference with a GraphicsController is that controllers can do whatever they want, while a listener is not allowed to interfere with the mouse events in any way. As a result, only one GraphicsController can be active on a map at any given time, while there is no limit to the amount of listeners active on a map.
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