Скачать или смотреть How to Create a ListView with a Custom Blank Divider in Flutter

Learn how to enhance your Flutter `ListView` by adding a customizable blank divider between list items, ensuring a seamless data view experience.
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This video is based on the question https://stackoverflow.com/q/63096536/ asked by the user 'kakyo' ( https://stackoverflow.com/u/987846/ ) and on the answer https://stackoverflow.com/a/63096633/ provided by the user 'dhanasekar' ( https://stackoverflow.com/u/3726510/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Flutter ListView with a Custom Blank Divider

When working with Flutter's ListView, you might encounter scenarios where you want to enhance the visual separation between certain elements without using a standard horizontal line. If you’re looking to add a customizable blank space right before the last ListTile, you’re in the right place! This post will guide you through a straightforward method to achieve this.

The Problem at Hand

You might find yourself in a situation where you need to display a series of items in a ListView, perhaps like so:

4 ListTile widgets

A blank space before the last ListTile

The catch here is that you wish to avoid using the standard Divider, which usually adds a horizontal line, and instead, you want a blank area with a customizable height. This also helps maintain an accurate one-to-one mapping between your underlying data model and the view, which is crucial for a consistent app state and layout.

The Conventional Approach

Initially, one might consider inserting an empty Container between the last two ListTile items. However, this approach has its drawbacks:

It adds a non-data item to your view, disrupting the mapping between your data model and the displayed items.

It can complicate functions like selection, as the count of visual items will not match the count of your data items.

The Suggested Solution

Fortunately, Flutter provides a very neat solution using the ListView.separated constructor. This method allows you to define how the space between your list items looks without breaking the data-to-view mapping.

Implementation Example

Here’s how you can implement this using ListView.separated:

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

Key Points Breakdown

itemCount: Set this to the number of items you have in your model list. This keeps your view in sync with your data.

separatorBuilder: This is where you define the spacing. Instead of a line, we utilize a SizedBox with a customizable height that can match your design requirements.

itemBuilder: Here you create each ListTile. This is where you can implement features such as selection based on your model.

Conclusion

By employing the ListView.separated constructor, you can easily create a ListView that meets your requirements without the hassle of mismatched data-display mappings. This not only leads to cleaner code but also enhances the user experience of your Flutter application.

Remember to customize the height in SizedBox(height: <height>) to fit the design of your application, and you'll have a perfectly tailored ListView in no time!

Happy coding!