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samples/provider_shopper
dependabot[bot] c929635c56 Bump go_router from 10.2.0 to 11.0.0 in /provider_shopper (#2026)
Bumps
[go_router](https://github.com/flutter/packages/tree/main/packages) from
10.2.0 to 11.0.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="55b7293656"><code>55b7293</code></a>
[go_router] Fixes the GoRouter.goBranch so that it doesn't reset extr…
(<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4723">#4723</a>)</li>
<li><a
href="7eee49a471"><code>7eee49a</code></a>
[webview_flutter_wkwebview] Adds WKWebView implementation to override
console...</li>
<li><a
href="d0411e450a"><code>d0411e4</code></a>
[various] Update invalid NSURL tests (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4959">#4959</a>)</li>
<li><a
href="51e74b9750"><code>51e74b9</code></a>
[ios_platform_images] Convert to Pigeon (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4945">#4945</a>)</li>
<li><a
href="d08ebfd2b7"><code>d08ebfd</code></a>
[go_router_builder] Generate initialLocation with
StatefulShellBranchConfig (...</li>
<li>See full diff in <a
href="https://github.com/flutter/packages/commits/go_router-v11.0.0/packages">compare
view</a></li>
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provider_shopper

A Flutter sample app that shows a state management approach using the Provider package. This is the app discussed in the Simple app state management section of flutter.dev.

Goals for this sample

  • Show simple use of Provider for providing an immutable value to a subtree
  • Illustrate a simple state management approach using the ChangeNotifier class
  • Show use of ProxyProvider for provided objects that depend on other provided objects

The important bits

lib/main.dart

Here the app sets up objects it needs to track state: a catalog and a shopping cart. It builds a MultiProvider to provide both objects at once to widgets further down the tree.

The CartModel instance is provided using a ChangeNotifierProxyProvider, which combines two types of functionality:

  1. It will automatically subscribe to changes in CartModel (if you only want this functionality simply use ChangeNotifierProvider).
  2. It takes the value of a previously provided object (in this case, CatalogModel, provided just above), and uses it to build the value of CartModel (if you only want this functionality, simply use ProxyProvider).

lib/models/*

This directory contains the model classes that are provided in main.dart. These classes represent the app state.

lib/screens/*

This directory contains widgets used to construct the two screens of the app: the catalog and the cart. These widgets have access to the current state of both the catalog and the cart via Provider.of.

Questions/issues

If you have a general question about Provider, the best places to go are:

If you run into an issue with the sample itself, please file an issue in the main Flutter repo.