onInit method
Called immediately after the widget is allocated in memory. You might use this to initialize something for the controller.
Implementation
@override
onInit() {
  _initRoomName();
  _initRoomType();
  _initStartTime();
  _initDuration();
  _getInitTimeZone();
  _initAttendees();
  roomNameController.addListener(_removeLeadingSpaces);
  super.onInit();
}