Beta 7 with some repo names changed.

UI/EventHandler.js

@@ -0,0 +1,46 @@
+
+function newEventHandler() {
+    let thisObject = {
+        name: undefined,                            // This is for debugging purposes only.
+        listenToEvent: listenToEvent,
+        stopListening: stopListening,
+        raiseEvent: raiseEvent,
+        finalize: finalize
+    }
+
+    let eventHandlers = []        // Here we store all the functions we will call when an event is raiseed.
+
+    return thisObject
+
+    function finalize() {
+        eventHandlers = []
+    }
+
+    function listenToEvent(eventType, handler, extraData) {
+        let eventSubscriptionId = newUniqueId()
+        eventHandlers.push([eventType, handler, extraData, eventSubscriptionId])
+        return eventSubscriptionId
+    }
+
+    function stopListening(pEventSubscriptionId) {
+        for (let i = 0; i < eventHandlers.length; i++) {
+            if (pEventSubscriptionId === eventHandlers[i][3]) {
+                eventHandlers.splice(i, 1)
+                return
+            }
+        }
+    }
+
+    function raiseEvent(eventType, event) {
+        for (var i = 0; i < eventHandlers.length; i++) {
+            /* We will execute all the functions listening to this event type. */
+
+            if (eventHandlers[i][0] === eventType) {
+                let handler = eventHandlers[i][1]
+                let extraData = eventHandlers[i][2]
+
+                handler(event, extraData)
+            }
+        }
+    }
+}