initSize method
Implementation
void initSize(BuildContext context){
if (screenSize != null) {
return;
}
_context = context;
WidgetsBinding.instance.addObserver(this);
final mqd = MediaQuery.of(context);
screenSize = _fixedSize ?? mqd.size;
_resolution ??= mqd.devicePixelRatio;
Future.delayed(Duration(milliseconds: renderNumber*100), () async{
await initPlatformState();
});
}