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About flutter architecture pattern, all you need is ‘state management’ keyword.
“How do I best manage the state of the UI controls in a medium-to-large Flutter app?” is a question we often hear. This is an complex topic with strong, and differing, opinions. Until we provide more docs/examples, learn more at the following links, some of which have been contributed by the Flutter community. — https://flutter.io/docs/development/data-and-backend/state-mgmt —
How to build reactive mobile apps with Flutter?
This article, I got the idea from Build reactive mobile apps with Flutter, a video from Google I/O 2018
Now we go with the default flutter project.
Flutter state
The widget is the main component in Flutter. Each widget has stated. The screen is a widget tree. The passing state follows the image.