Editor can have custom key event handler.

editor.keyEventHandler.handleKeyEvent is passed all key events. When it returns true, the event is not handled by Ace.

src/atom/editor.coffee

@@ -12,6 +12,7 @@ class Editor extends Template
   viewProperties:
     aceEditor: null
     buffer: null
+    keyEventHandler: null
 
     initialize: () ->
       @aceSessions = {}
@@ -34,6 +35,13 @@ class Editor extends Template
       @aceEditor = ace.edit this[0]
       @aceEditor.setTheme(require "ace/theme/twilight")
 
+      @aceEditor.setKeyboardHandler
+        handleKeyboard: (data, hashId, keyString, keyCode, e) =>
+          if @keyEventHandler?.handleKeyEvent(e)
+            {command: {exec: ->}}
+          else
+            null
+
     getAceSession: ->
       @aceEditor.getSession()