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Discover how to create a smooth horizontal scrolling experience in Flutter using `PageView.builder` instead of `ListView`, ensuring full images are displayed.
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This video is based on the question https://stackoverflow.com/q/66412583/ asked by the user 'lulu' ( https://stackoverflow.com/u/15200935/ ) and on the answer https://stackoverflow.com/a/66413548/ provided by the user 'Islomkhuja Akhrarov' ( https://stackoverflow.com/u/11073961/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Scroll in Flutter ListView Child by Child: A Complete Guide

When developing a mobile application using Flutter, you may find yourself needing to display a series of images or items that users can scroll through — similar to the way Instagram displays photos. A common challenge arises when you want to ensure that each image takes up the full width of the screen, preventing the display of half images when users start scrolling. In this post, we’ll explore how to effectively manage scrolling in Flutter to achieve that perfect visual experience.

The Problem

You want to create a user-friendly horizontal scroll view in your Flutter application. The goal is straightforward:

Display images in a way that each image fills the entire width of the screen.

Avoid showing partial images when the user starts to scroll.

Initially, you might think of using a ListView for this purpose, but this can lead to issues like displaying partial images. So, how can we solve this and enhance the scrolling experience?

The Solution: Using PageView.builder

Instead of using ListView, the recommended approach is to utilize PageView.builder. This widget is designed specifically for situations where you want to flip through pages (or items) like a carousel, ensuring that only one full item is visible at a time, thus avoiding those awkward half-image scenarios. Let’s break down how to implement this:

Step 1: Set Up PageView

Start by replacing your ListView with PageView.builder in your Flutter app.

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

Step 2: Understanding the Code

PageView.builder: This constructor creates a scrollable widget that can change its child as the user scrolls, efficiently managing memory and performance.

itemCount: Define how many images you want to display.

scrollDirection: Axis.horizontal: Indicates that the scrolling should be horizontal (left to right).

itemBuilder: A function that generates the children of the PageView. For each index, it returns a Container with the image.

Step 3: Asset Management

Ensure your images are correctly added to your project structure. The sample code references images located in assets/images/tests/, ensuring you have the images accessible during runtime. Make sure to include the necessary asset paths in your pubspec.yaml file.

Benefits of Using PageView.builder

Full Page Visibility: Every image is displayed fully as you swipe, without clipping or showing half images.

Better Performance: PageView.builder is memory efficient since it only builds the visible items, making it ideal for larger collections of images.

User Experience: The swipe gesture feels natural and engaging for users, enhancing the overall app experience.

Conclusion

Opting for PageView.builder instead of ListView allows you to create a highly interactive and visually appealing horizontal scrolling interface in your Flutter application. With just a few lines of code, you can ensure that each image displays fully, providing a clean and seamless experience for users as they navigate through your content. Happy coding!