Tag: dart

Wrap the subtree in Material(type: MaterialType.transparency) or put the screen in a Scaffold. MaterialApp alone does not provide a Material ancestor, which is why TextField and InkWell assert.

Attach a ScrollController to a ListView.builder, fire the next page when position.extentAfter drops below a prefetch threshold, and guard the fetch with isLoading, hasMore, and error flags. Full implementation plus the short-first-page trap.

Flutter 3.44.8 stable still ships no public multi-window API. Here is how to turn on the experimental windowing feature flag on the main channel, use RegularWindowController and WindowManager to open real top-level windows, and what to ship instead if you need stable today.

The keyboard shrinks your Scaffold body's max height, so a Column that just fit now overflows. Wrap the body in a scrollable instead of turning resizeToAvoidBottomInset off.

That line is a wrapper, not the error. Re-run with flutter run --verbose or ./gradlew assembleDebug --stacktrace, read the real Gradle failure, then fix that.

The asset key is missing from the compiled bundle, not from your disk. Fix the pubspec indentation, add the trailing slash, match the key exactly, then full restart.

A complete guide to shipping a Flutter web app compiled to WebAssembly on Flutter 3.44: what the two emitted builds look like, why Firefox and Safari still get JavaScript because of the loader's wasmAllowList, migrating off dart:html for dart2wasm, the COOP/COEP headers that decide whether skwasm runs multi-threaded, and how to prove at runtime which build the browser actually loaded.

A step-by-step move from widget-local setState to a Riverpod 3.x Notifier: classify what actually leaves the widget, write the Notifier, convert to ConsumerWidget, and survive the == filtering, build() re-entry, and autoDispose defaults that bite setState refugees. Tested on Flutter 3.44, Dart 3.x, flutter_riverpod 3.3.2.

Install flutter_riverpod for almost every Flutter app. Use riverpod only for Dart-only code, and hooks_riverpod only if you already use flutter_hooks.

In Riverpod 3.0 every provider filters listener notifications with ==, not identity. A StreamProvider that re-emits the same mutable object stops rebuilding the UI after the first frame. Here is why it happens and three ways to fix it. Tested on flutter_riverpod 3.3.2, Flutter 3.44, Dart 3.x.