Initial commit

Co-Authored-By: Eric Tuvesson <eric.tuvesson@gmail.com>
Co-Authored-By: mikaeltellhed <2311083+mikaeltellhed@users.noreply.github.com>
Co-Authored-By: kotte <14197736+mrtamagotchi@users.noreply.github.com>
Co-Authored-By: Anders Larsson <64838990+anders-topp@users.noreply.github.com>
Co-Authored-By: Johan  <4934465+joolsus@users.noreply.github.com>
Co-Authored-By: Tore Knudsen <18231882+torekndsn@users.noreply.github.com>
Co-Authored-By: victoratndl <99176179+victoratndl@users.noreply.github.com>

packages/noodl-editor/src/shared/utils/EventDispatcher.ts

@@ -0,0 +1,45 @@
+export class EventDispatcher {
+  listeners: any[];
+
+  constructor() {
+    this.listeners = [];
+  }
+
+  on(event: string | string[], listener, group: unknown) {
+    this.listeners.push({ event: event, listener: listener, group: group });
+  }
+
+  notifyListeners(event: string, args?) {
+    const testForComps = event.split('.');
+
+    function notify(event, listener, eventName) {
+      const comps = event.split('.');
+      if (comps[0] === testForComps[0] && (comps[1] === '*' || comps[1] === testForComps[1])) listener(args, eventName);
+    }
+
+    for (const i in this.listeners) {
+      if (this.listeners[i].event instanceof Array) {
+        for (const j in this.listeners[i].event) notify(this.listeners[i].event[j], this.listeners[i].listener, event);
+      } else {
+        notify(this.listeners[i].event, this.listeners[i].listener, event);
+      }
+    }
+  }
+
+  emit(event: string, args?) {
+    this.notifyListeners(event, args);
+  }
+
+  off(group: unknown) {
+    if (group === undefined) return;
+
+    for (let i = 0; i < this.listeners.length; i++) {
+      if (this.listeners[i].group === group) {
+        this.listeners.splice(i, 1);
+        i--;
+      }
+    }
+  }
+
+  static instance = new EventDispatcher();
+}