First commit

lib/util.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+
+import 'dart:async';
+import 'dart:ui';
+
+class Util {
+
+  Future<Size> initialDimensions() async {
+    // https://github.com/flutter/flutter/issues/5259
+    // "In release mode we start off at 0x0 but we don't in debug mode"
+    return await new Future<Size>(() {
+      if (window.physicalSize.isEmpty) {
+        var completer = new Completer<Size>();
+        window.onMetricsChanged = () {
+          if (!window.physicalSize.isEmpty) {
+            completer.complete(window.physicalSize);
+          }
+        };
+        return completer.future;
+      }
+      return window.physicalSize;
+    });
+  }
+}