Скачать или смотреть How to Pass a Parameter to a Mobx Controller in Flutter

Learn how to effectively pass a parameter to a Mobx Controller in Flutter, enabling better testability and flexibility in your app's architecture.
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This video is based on the question https://stackoverflow.com/q/63549686/ asked by the user 'Guilherme Oliveira' ( https://stackoverflow.com/u/8429100/ ) and on the answer https://stackoverflow.com/a/64320708/ provided by the user 'Lance Chen' ( https://stackoverflow.com/u/1467852/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Passing Parameters to a Mobx Controller in Flutter

As an Android Developer transitioning to Flutter, you might find yourself leveraging the power of Mobx for state management. One question that frequently arises is how to pass a parameter, such as a repository or data source, to a Mobx Controller. This is similar to how you might handle ViewModels in Android. In this post, we will walk you through the steps necessary to accomplish this effectively, giving you greater control over your data sources and enhancing your app's testability.

Understanding the Controller Structure

First, let’s review the current structure of a Mobx Controller in Flutter. Here's a simplified version of the code that we will be working with:

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In this code snippet, you can see that we want to be able to pass a DataSource repository into the controller class so that our createBill method can utilize it effectively.

How to Pass a DataSource as a Parameter

To modify the controller so that you can pass a DataSource as a parameter, follow these steps:

Step 1: Declare a Constructor for the Controller

The first thing you need to do is declare a constructor for the CreateBillController. Since constructors are not inherited by child classes in Dart, we'll also implement a constructor for the _CreateBillControllerBase.

Here's how you can do it:

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Step 2: Modify the Base Class

Now, you need to modify the _CreateBillControllerBase class to declare the datasource property and ensure that it is set through the constructor.

Here is the modified version of the base class:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Usage Example

Once you have set up your controllers properly, you can instantiate CreateBillController and pass it the DataSource you want to use. Here’s an example:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the steps outlined above, you can seamlessly pass a parameter like a DataSource to a Mobx Controller in Flutter. This approach not only enhances the performance and scalability of your application but also allows for easier testing with different data sources. As you continue to adapt your Android skills to Flutter, this technique will prove invaluable in creating effective and modular applications.

Now, go ahead and implement these changes in your Flutter project to make the most out of Mobx and improve the architecture of your code! Feel free to explore and modify further as per the needs of your application.