Solve the Issue of SingleChildScrollView Not Scrolling with Positioned Widget in Flutter

Discover how to fix the scrolling problem in Flutter when using `SingleChildScrollView` with a `Positioned` widget. Follow this guide for clear steps and examples.
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This video is based on the question https://stackoverflow.com/q/69971899/ asked by the user 'Francesco' ( https://stackoverflow.com/u/9611331/ ) and on the answer https://stackoverflow.com/a/69972265/ provided by the user 'Muhamad Jalal' ( https://stackoverflow.com/u/9134686/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Flutter: Solving the SingleChildScrollView Scrolling Issue with a Positioned Widget

When developing applications in Flutter, you may encounter challenges with scrolling widgets, particularly when combined with positioning elements within a Stack. A common problem faced by developers is that a SingleChildScrollView does not scroll when it contains a Positioned widget. This issue can be frustrating, especially when trying to create a visually appealing layout for your app. In this guide, we’ll look at why this happens and how to effectively resolve it.

Understanding the Problem

In your Flutter application, you might be trying to create a scrollable list inside a custom box defined by the Positioned widget. However, the ListView inside the SingleChildScrollView fails to scroll, potentially leading to a subpar user experience. Let’s break down the issue further:

Widgets: You are using Positioned inside a Stack to control the placement of your list (box).

Scrolling: The combination of a SingleChildScrollView and ListView configured in a way that prevents scrolling is problematic.

In essence, the ListView.builder was set to have NeverScrollableScrollPhysics(), which means it won’t respond to scroll events, resulting in a non-functional scrollable area.

Steps to Resolve the Scrolling Issue

To remedy the problem, you'll need to update your FutureBuilder and modify how you structure your widgets. Below are the key changes you should implement:

Modify the FutureBuilder

Here’s a step-by-step guide on how to refactor your existing FutureBuilder:

Check for Data: Always ensure that data is available before constructing the widget that needs to scroll.

Refactor Structure: Instead of embedding a ListView.builder inside a Column, you can directly convert your list of items into widgets and display them.

Here’s the updated code snippet to implement these changes:

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

Key Points to Remember

Scrolling Behavior: Ensure your scrollable widget, like SingleChildScrollView, has a scroll physics that allows it to respond to user gestures.

Positioning: Use Positioned carefully to not obstruct the scrolling area.

Handling Data: Always manage the state of data loading, ensuring a smooth user experience while the data is being fetched.

Conclusion

In conclusion, resolving the SingleChildScrollView not scrolling issue when combined with Positioned in Flutter requires understanding the architecture of the widgets you are using. By refactoring the FutureBuilder and managing your widget structure better, you can create a functional and efficient scrolling area in your app.

With these insights, you can confidently tackle similar problems in the future and improve the user experience in your Flutter applications. Happy coding!

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