From c1c35369d1ae017971e6d8cbafc06844f02fd00d Mon Sep 17 00:00:00 2001
From: Johannes Eder <ederj@cip.ifi.lmu.de>
Date: Mon, 14 Jun 2021 14:44:03 +0200
Subject: [PATCH] feat: implemented an event manager

---
 .../src/lib/event-manager/event-manager.js    | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 frontend/src/lib/event-manager/event-manager.js

diff --git a/frontend/src/lib/event-manager/event-manager.js b/frontend/src/lib/event-manager/event-manager.js
new file mode 100644
index 000000000..810cfab55
--- /dev/null
+++ b/frontend/src/lib/event-manager/event-manager.js
@@ -0,0 +1,65 @@
+
+export const EVENT_TYPE = {
+    CLICK : 'click',
+    KEYDOWN : 'keydown',
+    //more to be added
+};
+
+
+
+export class EventManager {
+    _registeredListeners;
+
+
+    constructor() {
+        this._registeredListeners = [];
+    }
+
+    registerNewListener(eventWrapper) {
+        this._debugLog('registerNewListener', eventWrapper);
+        let element = eventWrapper.element;
+        element.addEventListener(eventWrapper.eventType, eventWrapper.eventHandler);
+        this._registeredListeners.push(eventWrapper);
+    }
+
+    removeAllEventListenersFromUtil() {
+        this._debugLog('removeAllEventListenersFromUtil',);
+        for (let eventWrapper of this._registeredListeners) {
+            let element = eventWrapper.element;
+            element.removeEventListener(eventWrapper.eventType, eventWrapper.eventHandler);
+        }
+        this._registeredListeners = [];        
+    }
+
+    //_debugLog() {}
+    _debugLog(fName, ...args) {
+      console.log(`[DEBUGLOG] EventManager.${fName}`, { args: args, instance: this });
+    }
+}
+
+export class EventWrapper {
+    _eventType;
+    _eventHandler;
+    _element;
+
+    constructor(_eventType, _eventHandler, _element) {
+        if(!_eventType || !_eventHandler || !_element) {
+            throw new Error('Not enough arguments!');
+        }
+        this._eventType = _eventType;
+        this._eventHandler = _eventHandler;
+        this._element = _element;
+    }
+
+    get eventType() {
+        return this._eventType;
+    }
+
+    get eventHandler() {
+        return this._eventHandler;
+    }
+
+    get element() {
+        return this._element;
+    }
+}
\ No newline at end of file