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Скачать или смотреть Creating a Common Parameter Type Widget Function Across Multiple Classes in Flutter

  • vlogize
  • 2025-09-02
  • 0
Creating a Common Parameter Type Widget Function Across Multiple Classes in Flutter
How to create common parameter type widget function in flutterflutterwidgetflutter dependencies
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Описание к видео Creating a Common Parameter Type Widget Function Across Multiple Classes in Flutter

Learn how to create a reusable common parameter type widget function in Flutter, allowing you to use it across different classes and improve your app's development process.
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This video is based on the question https://stackoverflow.com/q/64521399/ asked by the user 'Abdul Kadhar' ( https://stackoverflow.com/u/10723909/ ) and on the answer https://stackoverflow.com/a/64521429/ provided by the user 'Lulupointu' ( https://stackoverflow.com/u/5990125/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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How to Create a Common Parameter Type Widget Function in Flutter

Creating reusable components is a critical part of developing applications in Flutter. It not only streamlines your codebase but also enhances maintainability and scalability. If you’ve ever faced the challenge of wanting a widget function to be reused across multiple classes but ran into issues with the function's parameters, you're not alone. This guide will guide you on how to create a common parameter type widget function in Flutter, ensuring it can be utilized across different pages or classes effectively.

The Problem

You might find yourself in a situation where you have a widget function, like _customDropDownProduct, that you wish to use in various classes or pages. However, the function's signature needs to match with the parameters expected by the widget calling it. If you attempt to pass the function incorrectly, you will encounter an error message that states:

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

This confusion arises from misusing widget functions in contexts expecting a function reference rather than a widget instance.

The Solution

To overcome this issue, we can take one of two approaches:

Extract the Function: Convert _customDropDownProduct into a global function that can be called from anywhere in your app.

Create a Custom Widget: Encapsulate the logic within a CustomDropDownProduct widget that you can instantiate whenever needed.

Option 1: Extracting the Function

To make _customDropDownProduct accessible everywhere, you can move the method out of the class where it was defined. Here is how you can do it:

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

Option 2: Creating a Custom Widget

Creating a custom widget is the more robust solution, especially if you need to maintain state within the widget. Here's how you can do this:

Step 1: Define the Custom Widget

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

Step 2: Utilize the Custom Widget

Wherever you need to use this custom widget, you can call it from the dropdownBuilder like this:

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

Conclusion

By adapting either of these methods, you can effectively create a common parameter type widget function that can be reused across multiple pages or classes in your Flutter application. This approach not only simplifies your code but also enhances the overall performance and readability of your app.

Feel free to explore and extend this idea to build more modular Flutter applications, making the most of your widgets!

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