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The Desigin Pattern

Goals for this sample

• Shows a state management approach using the Provider package,mainly use StreamProvider and ChangeNotifier.
• Show a logic for fetch data from different datasources as above graph.

Memory fetch data

Change repositories/catalog.dart

const dataSource = 'memory';

repositories/catalog.dart A route distribution for fetching data memory/catalog.dart All CURD operations will be herefile/catalog.dart Define data

Sqlite fetch data

Change repositories/catalog.dart

const dataSource = 'db';

Notice

You can’t use cart.items.contains(item) to compare catalog whether exists in cart,because use database reload data.Add contains method in cart controller,and use below

cart.contains(item.id)

Todo

• Http implement

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Screen Shots

Download Flutter shopper app source code on GitHub

https://github.com/flutter-samples/flutter-design-pattern