Adds ReactEventEmitter and full handling of broadcastStarted event

src/methods/initializeScreenShare.tsx

@@ -0,0 +1,36 @@
+import { initializeScreenShare as nativeInitializeScreenShare } from '../native-components/BBBN_ScreenShareService';
+import nativeEmitter from '../native-messaging/emitter';
+
+// Reference to the resolver of last call
+let resolve = (a: String) => {
+  console.log(
+    `default resolve function called, this should never happen: ${a}`
+  );
+};
+
+// Log a message when broadcast is requested
+nativeEmitter.addListener('onBroadcastRequested', () => {
+  console.log(`Broadcast requested`);
+});
+
+// Resolve promise when broadcast is started (this event means that user confirmed the screenshare)
+nativeEmitter.addListener('onBroadcastStarted', () => {
+  resolve('null');
+});
+
+// Entry point of this method
+function initializeScreenShare() {
+  return new Promise((res, rej) => {
+    // store the resolver for later call (when event is received)
+    resolve = res;
+
+    try {
+      // call native swift method that triggers the broadcast popup
+      nativeInitializeScreenShare();
+    } catch (e) {
+      rej(`Call to nativeInitializeScreenShare failed`);
+    }
+  });
+}
+
+export default initializeScreenShare;