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Michael Lazebny's blog about @dart and @flutter
lazebny.io
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Implemented extremely simple forms for #Flutter that support asynchronous validators πŸ‘€
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πŸ”₯ A new article about popups is coming next week!

In the meantime, I have created a custom popup that positions follower widget relatively to a target and prevents it from overflowing the screen.

#flutter
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Avoid these dart libraries. Briefly about their drawbacks and better alternatives.
https://lazebny.io/avoid-these-dart-libraries/

#flutter #flutterdev #dart
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Tomorrow, I'm launching a new article series on creating UI Kits.

I’ll guide you through developing various components like buttons, text fields, and more.

You’ll also learn about animations, transitions, iconography, responsive design tools, and best practices for layouts and custom components.

#article #uikit #flutter
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Learn how to build efficient sticky headers in Flutter using slivers for seamless scrolling. Includes code examples and best practices!

https://lazebny.io/sticky-headers

#flutter #article
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Learn how scroll works in Flutter, the differences between scroll widgets, and how to build efficient layouts using slivers for best performance.

https://lazebny.io/flutter-slivers

#article #flutter #slivers
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I created a simple but much more powerful alternative to Widgetbook, Storybook, and similar tools.

It automatically generates routes for GoRouter (supports deep links).

It also makes it very easy to create configurations, fields, etc., for customizing widgets.

This is just an exampleβ€”it will be improved over time and might eventually be added to sizzle starter or a separate package.

Github Link

#flutter
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Created a minimal example of custom AppBars using SliverPersistentHeaderDelegate.Take a look here https://github.com/hawkkiller/pageheader/blob/main/lib/page_header.dart

#flutter #flutterdev
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If you want to make your VS Code indentation a bit more beautiful for #Flutter widgets, set "dart.previewFlutterUiGuides" to true

If I'm not mistaken, the same thing exists in IDEA :)
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When updating dependencies in a Pub Workspace, use "dart pub upgrade," which automatically resolves to the correct version and updates it in every package.

#flutter #FlutterDev #dart #tip
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I created a Shimmer animation in Flutter in 100 lines without libraries.

It is performant and minimizes rebuilds, based on a CustomPaint, a LinearGradient, and a Transform.

https://gist.github.com/hawkkiller/2ed40b43d6372fc322080e0c8ce76521

#dart #flutter #flutterdev
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Don't use SVGs for Icons in Flutter. There are better and more performant ways.

Rendering SVG requires several time-consuming operations: reading from memory, parsing the SVG to a binary format, parsing the binary format to Dart structures, and only then rendering.

Instead, opt for icon fonts, similar to the Icons class in Flutter. A Flutter engine processes all the fonts during startup and makes them available throughout the whole app lifecycle. The performance of rendering an icon font is the same as rendering text.

#dart #flutter #flutterdev
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Don't use SVGs for Icons in Flutter. There are better and more performant ways. Rendering SVG requires several time-consuming operations: reading from memory, parsing the SVG to a binary format, parsing the binary format to Dart structures, and only then…
I have created SVG vs Iconfont Performance Benchmark

It tracks the rasterization, which is the process of rendering UI objects as pixels on the screen.

The icon font is much better on the GPU thread. SVG's complexity leads to expensive rasterization, which easily overwhelms the GPU and causes stutters.

You can check the full benchmark here https://github.com/hawkkiller/svg_iconfont_benchmark

Note that I tested on my MacBook, which is extremely performant. Testing on a low-end Android device may provide even more insights.

I also tried to add some readmes for better understanding.

#flutter #flutterdev
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There is an easy way to speed up Flutter tests in CI.

If you have a large test suite, use sharding. It distributes the number of tests between multiple shards, so you can create multiple parallel jobs in CI.

#flutter #FlutterDev
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Do not hardcode paths to assets; use the path generator!

The generator ensures that assets exist and removes the possibility of a typo.
Explore what fits your needs, but I would recommend flutter_gen/spider.

#flutter #flutterdev
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It is better to wait before updating Flutter to the latest stable version.

After a new stable, there are usually multiple fixes published – 3.32 had 8 patches!

I recommend staying 1 stable version behind the latest release. This ensures that you won't be affected by regressions and new bugs.

#flutter #flutterdev
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Is your layout ready for RTL languages?

A common mistake is using a fixed left/right EdgeInsets or Alignment.

Instead, use their directional counterparts. They provide logical start and end properties, allowing the UI to adapt automatically.

#flutter #flutterdev
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