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Description:

scaled app

Scale the entire UI design proportionally.
Button, image, font, every widget is scaled simultaneously.
Before:

250x250 square is the same size across devices

After:

250x250 square is two thirds the screen width across devices

if we resize the screenshots above to be the same width
then everything appears the same size as below

Live demo #
https://lastmonopoly.github.io/flutter_web_app/scaled_app_demo/
Features #
Use this package in your Flutter app when:

your UI design is fixed-width
you want to scale the entire UI, not just part of it

Usage #
Firstly, replace runApp with runAppScaled
void main() {
// 1st way to use this package
runAppScaled(const MyApp(), scaleFactor: (deviceSize) {
// screen width used in your UI design
const double widthOfDesign = 375;
return deviceSize.width / widthOfDesign;
});
}
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Or, replace WidgetsFlutterBinding with ScaledWidgetsFlutterBinding
void main() {
// 2nd way to use this package
// Scaling will be applied based on [scaleFactor] callback.
ScaledWidgetsFlutterBinding.ensureInitialized(
scaleFactor: (deviceSize) {
// screen width used in your UI design
const double widthOfDesign = 375;
return deviceSize.width / widthOfDesign;
},
);
runApp(const MyApp());
}
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Then, use MediaQueryData.scale to scale size, viewInsets, viewPadding, etc.
class PageRoute extends StatelessWidget {
const PageRoute({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
return MediaQuery(
data: MediaQuery.of(context).scale(),
child: const Scaffold(...),
);
}
}
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Optionally, update ScaledWidgetsFlutterBinding.instance.scaleFactor to enable / disable scaling on demand.
Reference #
https://juejin.cn/post/7078816723666731021