fluttersmith/tipsFlutter tips that still compile.https://fluttersmith.github.io/Check ref.mounted after an await in a providerhttps://fluttersmith.github.io/tips/tips/ref-mounted/https://fluttersmith.github.io/tips/tips/ref-mounted/A provider can be disposed while a Future is pending. Check ref.mounted after the await before you touch state, or Riverpod 3 throws.Thu, 24 Sep 2026 00:00:00 GMTriverpodasyncStyle an ElevatedButton with styleFrom and themeshttps://fluttersmith.github.io/tips/tips/elevated-button-style/https://fluttersmith.github.io/tips/tips/elevated-button-style/Use ElevatedButton.styleFrom for one button, ElevatedButtonThemeData for all of them, and WidgetStateProperty when a style depends on state.Wed, 23 Sep 2026 00:00:00 GMTbuttonsthemingParse JSON safely with map patternshttps://fluttersmith.github.io/tips/tips/json-pattern-matching/https://fluttersmith.github.io/tips/tips/json-pattern-matching/A switch on a map pattern checks keys and value types in one go, so bad JSON reaches your fallback case instead of a TypeError.Tue, 22 Sep 2026 00:00:00 GMTjsonpatternssealed-classesMigrate a StateNotifier to a Notifierhttps://fluttersmith.github.io/tips/tips/notifier-replaces-state-notifier/https://fluttersmith.github.io/tips/tips/notifier-replaces-state-notifier/StateNotifier now lives in legacy.dart. Moving to Notifier takes a few mechanical steps, and one behaviour change is worth knowing about.Mon, 21 Sep 2026 00:00:00 GMTriverpodmigrationShow real progress with a value on progress indicatorshttps://fluttersmith.github.io/tips/tips/determinate-progress/https://fluttersmith.github.io/tips/tips/determinate-progress/Give CircularProgressIndicator or LinearProgressIndicator a value from 0.0 to 1.0 and they show how far along you are instead of spinning.Sun, 20 Sep 2026 00:00:00 GMTprogressaccessibilityInitialise async dependencies in main() and use requireValuehttps://fluttersmith.github.io/tips/tips/require-value-async-init/https://fluttersmith.github.io/tips/tips/require-value-async-init/Await a FutureProvider once before runApp, then read it synchronously everywhere with requireValue. No loading states for things that are always ready.Sat, 19 Sep 2026 00:00:00 GMTriverpodasyncfirstOrNull instead of try/catch on StateErrorhttps://fluttersmith.github.io/tips/tips/first-or-null/https://fluttersmith.github.io/tips/tips/first-or-null/first, firstWhere and single throw when nothing matches. The OrNull versions return null, and the type system makes you handle it.Sat, 19 Sep 2026 00:00:00 GMTcollectionsnull-safetyMake text selectable across widgets with SelectionAreahttps://fluttersmith.github.io/tips/tips/selection-area/https://fluttersmith.github.io/tips/tips/selection-area/Wrap a subtree in SelectionArea and one selection runs across all its Text widgets. SelectionContainer.disabled carves out the parts to skip.Fri, 18 Sep 2026 00:00:00 GMTtextPass arguments to a Notifier through its constructorhttps://fluttersmith.github.io/tips/tips/notifier-with-arguments/https://fluttersmith.github.io/tips/tips/notifier-with-arguments/In Riverpod 3 a family notifier is a plain Notifier that takes its argument in the constructor, so every method can use it as a field.Thu, 17 Sep 2026 00:00:00 GMTriverpodprovidersSkip nulls in collection literals with ...? and ?valuehttps://fluttersmith.github.io/tips/tips/null-aware-elements/https://fluttersmith.github.io/tips/tips/null-aware-elements/The null-aware spread adds nothing for a null list, and a null-aware element leaves out a null entry, so you can drop the if (x != null).Wed, 16 Sep 2026 00:00:00 GMTcollectionsnull-safetyReact to the app going to the background with AppLifecycleListenerhttps://fluttersmith.github.io/tips/tips/app-lifecycle-listener/https://fluttersmith.github.io/tips/tips/app-lifecycle-listener/AppLifecycleListener gives you one named callback per lifecycle transition. No observer mixin needed, but you must dispose it.Tue, 15 Sep 2026 00:00:00 GMTlifecycleExtension types vs extension methodshttps://fluttersmith.github.io/tips/tips/extension-types/https://fluttersmith.github.io/tips/tips/extension-types/An extension method adds to a type. An extension type wraps it in a new static type, so a UserId can't be passed where an OrderId belongs.Mon, 14 Sep 2026 00:00:00 GMTextension-typesdart3typesAsyncValue.guard instead of try/catch in notifiershttps://fluttersmith.github.io/tips/tips/async-value-guard/https://fluttersmith.github.io/tips/tips/async-value-guard/AsyncValue.guard runs a Future and hands back AsyncData or AsyncError, so notifier methods need no try/catch.Mon, 14 Sep 2026 00:00:00 GMTriverpoderrorsReplace Container with the widgets it wrapshttps://fluttersmith.github.io/tips/tips/replace-container/https://fluttersmith.github.io/tips/tips/replace-container/Container is a bundle of Padding, ColoredBox, DecoratedBox, Align and SizedBox. Use those directly and the whole subtree can be const.Sun, 13 Sep 2026 00:00:00 GMTwidgetslayoutAwait several futures with a record's .waithttps://fluttersmith.github.io/tips/tips/future-wait-records/https://fluttersmith.github.io/tips/tips/future-wait-records/Future.wait gives you a List of Object. A record of futures with .wait keeps each type and tells you which one failed.Sat, 12 Sep 2026 00:00:00 GMTasyncrecordserrorsGive buttons the same width with IntrinsicWidthhttps://fluttersmith.github.io/tips/tips/intrinsic-width/https://fluttersmith.github.io/tips/tips/intrinsic-width/Wrap a Column in IntrinsicWidth and stretch its children, and every button matches the widest one, whatever the text size.Fri, 11 Sep 2026 00:00:00 GMTlayoutOne widget for AsyncValue loading and error stateshttps://fluttersmith.github.io/tips/tips/async-value-widget/https://fluttersmith.github.io/tips/tips/async-value-widget/Wrap AsyncValue in a small widget with a switch over AsyncData, AsyncError and AsyncLoading, and every async screen writes only its data UI.Fri, 11 Sep 2026 00:00:00 GMTriverpodwidgetsDestructure lists with list patternshttps://fluttersmith.github.io/tips/tips/destructure-lists/https://fluttersmith.github.io/tips/tips/destructure-lists/List patterns pull values out of a list by position, and a rest element skips or collects whatever sits in the middle.Thu, 10 Sep 2026 00:00:00 GMTpatternscollectionsdart3Which Riverpod 3 provider should you use?https://fluttersmith.github.io/tips/tips/which-provider/https://fluttersmith.github.io/tips/tips/which-provider/Six providers cover almost every job in Riverpod 3. StateProvider, StateNotifierProvider and ChangeNotifierProvider now live in legacy.dart.Wed, 09 Sep 2026 00:00:00 GMTriverpodprovidersmigrationReturn SizedBox.shrink() when there is nothing to showhttps://fluttersmith.github.io/tips/tips/sizedbox-shrink/https://fluttersmith.github.io/tips/tips/sizedbox-shrink/A build method must return a widget. For "nothing", return const SizedBox.shrink(), not an empty Container.Wed, 09 Sep 2026 00:00:00 GMTwidgetslayoutReturn multiple values with a recordhttps://fluttersmith.github.io/tips/tips/records-multiple-returns/https://fluttersmith.github.io/tips/tips/records-multiple-returns/A record returns two or more values without a throwaway class, and destructuring unpacks them in one line at the call site.Tue, 08 Sep 2026 00:00:00 GMTrecordspatternsdart3typesref.watch, ref.read or ref.listen?https://fluttersmith.github.io/tips/tips/ref-watch-read-listen/https://fluttersmith.github.io/tips/tips/ref-watch-read-listen/Watch to rebuild, read for a one-off value inside a callback, listen to run side effects like SnackBars.Mon, 07 Sep 2026 00:00:00 GMTriverpodSwitch on a record to match several values at oncehttps://fluttersmith.github.io/tips/tips/switch-on-records/https://fluttersmith.github.io/tips/tips/switch-on-records/Put two or three values in a record and switch on it. Each case is a row in a table, instead of a tangle of if/else.Sun, 06 Sep 2026 00:00:00 GMTpatternsrecordsdart3Use MediaQuery.sizeOf instead of MediaQuery.ofhttps://fluttersmith.github.io/tips/tips/mediaquery-sizeof/https://fluttersmith.github.io/tips/tips/mediaquery-sizeof/MediaQuery.of rebuilds your widget when anything changes. MediaQuery.sizeOf and friends rebuild only when the value you read changes.Sun, 06 Sep 2026 00:00:00 GMTperformancelayoutThe parts of a Riverpod 3 providerhttps://fluttersmith.github.io/tips/tips/provider-anatomy/https://fluttersmith.github.io/tips/tips/provider-anatomy/A provider is a global variable, a type, a body that gets a Ref, and optional modifiers. Here is what each part does.Sat, 05 Sep 2026 00:00:00 GMTriverpodprovidersA Result type with a sealed classhttps://fluttersmith.github.io/tips/tips/sealed-class-result/https://fluttersmith.github.io/tips/tips/sealed-class-result/Return success or failure instead of throwing, and let an exhaustive switch make sure every caller handles both.Fri, 04 Sep 2026 00:00:00 GMTsealed-classeserrorspatternsCheck context.mounted after every awaithttps://fluttersmith.github.io/tips/tips/context-mounted-async-gaps/https://fluttersmith.github.io/tips/tips/context-mounted-async-gaps/A BuildContext can go stale while you await. Check context.mounted before you use it again, or grab what you need first.Fri, 04 Sep 2026 00:00:00 GMTcontextasyncGetting a Future from a FutureProviderhttps://fluttersmith.github.io/tips/tips/future-provider-future/https://fluttersmith.github.io/tips/tips/future-provider-future/Watch provider.future to await one async provider inside another, and combine the results with plain async code.Thu, 03 Sep 2026 00:00:00 GMTriverpodprovidersasyncColumn(spacing:) replaces a SizedBox between every childhttps://fluttersmith.github.io/tips/tips/column-row-spacing/https://fluttersmith.github.io/tips/tips/column-row-spacing/Row, Column and Flex take a spacing value, so you no longer need a SizedBox or the gap package between children.Wed, 02 Sep 2026 00:00:00 GMTlayoutwidgetsMeasure execution time with Stopwatchhttps://fluttersmith.github.io/tips/tips/stopwatch-measure-time/https://fluttersmith.github.io/tips/tips/stopwatch-measure-time/DateTime.now() reads the wall clock, which can jump. Stopwatch can't, so use it to time code.Tue, 01 Sep 2026 00:00:00 GMTperformanceasyncrecords