Question 1

How do I add a before after slider in Flutter?

Accepted Answer

Import the before_after package, add it to pubspec.yaml, use the BeforeAfter widget with before and after Image widgets, and manage state with onValueChanged. The README provides a basic code example to get started quickly.

Question 2

Can I use Before After with network images?

Accepted Answer

Yes, since the before and after parameters accept any Widget, you can use Image.network() for network images. However, you'll need to handle image loading, caching, and error states independently as the package doesn't provide built-in solutions.

Question 3

How to change the slider to vertical in Before After?

Accepted Answer

Set the direction parameter to SliderDirection.vertical. This is documented in the attributes table and allows you to switch between horizontal and vertical layouts based on your app's design needs.

Question 4

Before After vs image_comparison for Flutter?

Accepted Answer

Before After is a lightweight, pure Dart package focused on customization and simplicity, ideal for static image comparisons. Image_comparison might offer more out-of-the-box features but could have dependencies. Choose Before After for full control and minimal bloat.

Question 5

How to customize the thumb style in Before After?

Accepted Answer

Use parameters like thumbColor, thumbDecoration, thumbWidth, and thumbHeight. For instance, set thumbDecoration with BoxDecoration for borders or shadows to match your app's UI, as detailed in the customization table.

Question 6

Does Before After work with Flutter web?

Accepted Answer

Yes, as a pure Dart package, it's compatible with all Flutter platforms including web, desktop, iOS, and Android. The live demo link in the README confirms its functionality on web.

Question 7

What are performance tips for large images with Before After?

Accepted Answer

Pre-optimize images by resizing or compressing them before loading, and consider using Flutter's Image.memory or caching packages. The widget doesn't handle image optimization internally, so performance depends on your asset management.

Before After

What is Before After?

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