ensureScreenSize static method

Future<void> ensureScreenSize([
  1. dynamic window,
  2. Duration duration = const Duration(milliseconds: 10)
])

Manually wait for window size to be initialized

Recommended to use before you need access window size or in custom splash/bootstrap screen FutureBuilder

example:

...
ScreenUtil.init(context, ...);
...
  FutureBuilder(
    future: Future.wait([..., ensureScreenSize(), ...]),
    builder: (context, snapshot) {
      if (snapshot.hasData) return const HomeScreen();
      return Material(
        child: LayoutBuilder(
          ...
        ),
      );
    },
  )

Implementation

static Future<void> ensureScreenSize([
  FlutterWindow? window,
  Duration duration = const Duration(milliseconds: 10),
]) async {
  final binding = WidgetsFlutterBinding.ensureInitialized();
  window ??= binding.window;

  if (window.viewConfiguration.geometry.isEmpty) {
    return Future.delayed(duration, () async {
      binding.deferFirstFrame();
      await ensureScreenSize(window, duration);
      return binding.allowFirstFrame();
    });
  }
}