* Handles mapping keys to actions for an element. One key map can be used for multiple actions.
* The constructor accepts the same config object as defined by {@link #addBinding}.
* If you bind a callback function to a KeyMap, anytime the KeyMap handles an expected key
* combination it will call the function with this signature (if the match is a multi-key
* combination the callback will still be called only once): (String key, Ext.EventObject e)
* Handles mapping keys to actions for an element. One key map can be used for multiple actions.
* The constructor accepts the same config object as defined by {@link #addBinding}.
* If you bind a callback function to a KeyMap, anytime the KeyMap handles an expected key
* combination it will call the function with this signature (if the match is a multi-key
* combination the callback will still be called only once): (String key, Ext.EventObject e)