ReactiveStatelessWidget class abstract

Use it instead of StatelessWidget to make the hole sub tree reactive.

Any state consumed in any widget child of the widget where the ReactiveStatelessWidget will be registered.

The list of registered states are updated for each rebuild. And any non used state will be removed from the list of subscribers.

Example:

@immutable
class ViewModel {
  // Inject a reactive state of type int.
  // Works for all primitives, List, Map and Set
  final counter1 = 0.inj();

  // For non primitives and for more options
  final counter2 = RM.inject<Counter>(
    () => Counter(0),
    // State will be redone and undone
    undoStackLength: 8,
    // Build-in logger
    debugPrintWhenNotifiedPreMessage: 'counter2',
  );

  //A getter that uses the state of the injected counters
  int get sum => counter1.state + counter2.state.value;

  incrementCounter1() {
    counter1.state++;
  }

  incrementCounter2() {
    counter2.state = Counter(counter2.state.value + 1);
  }
}
class CounterApp extends ReactiveStatelessWidget {
   const CounterApp();

    @override
    Widget build(BuildContext context) {
      return Column(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          Counter1View(),
          Counter2View(),
          Text('🏁 Result: ${viewModel.sum}'), // Will be updated when sum changes
        ],
      );
    }
  }

  // Child 1 - Plain StatelessWidget
  class Counter1View extends StatelessWidget {
    const Counter1View({Key? key}) : super(key: key);

    @override
    Widget build(BuildContext context) {
      return Column(
        children: [
          ElevatedButton(
            child: const Text('🏎️ Counter1 ++'),
            onPressed: () => viewModel.incrementCounter1(),
          ),
          // Listen to the state from parent
          Text('Counter1 value: ${viewModel.counter1.state}'),
        ],
      );
    }
  }

  // Child 2 - Plain StatelessWidget
  class Counter2View extends StatelessWidget {
    const Counter2View({Key? key}) : super(key: key);

    @override
    Widget build(BuildContext context) {
      return Column(
        children: [
          ElevatedButton(
            child: const Text('🏎️ Counter2 ++'),
            onPressed: () => viewModel.incrementCounter2(),
          ),
          ElevatedButton(
            child: const Text('⏱️ Undo'),
            onPressed: () => viewModel.counter2.undoState(),
          ),
          Text('Counter2 value: ${viewModel.counter2.state.value}'),
        ],
      );
    }
  }

Important Notes:

Child widgets that are load lazily can not register state to the parent ReactiveStateless. For example:
- The Widgets rendered inside the builder method of ListView.builder.
- Widgets rendered inside SliverAppBar, SliverList and SliverGrid.
Never use ReactiveStatelessWidget above MaterialApp. See TopStatelessWidget

ReactiveStatelessWidget offers the following hooks: ReactiveStatelessWidget.didMountWidget, ReactiveStatelessWidget.didUnmountWidget ReactiveStatelessWidget.didAddObserverForDebug ReactiveStatelessWidget.shouldRebuildWidget

didNotifyWidget

Inheritance

Object
DiagnosticableTree
Widget
StatefulWidget
IStatefulWidget
ReactiveStatelessWidget

Available extensions

Constructors

ReactiveStatelessWidget({Key? key}): Use it instead of StatelessWidget to make the hole sub tree reactive.
const

Properties

hashCode → int: The hash code for this object.
no setterinherited
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
makeRefreshable → Widget: Available on Widget?, provided by the WidgetExtension extension
Make your any widget refreshable with RefreshIndicator on top
no setter
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

addMaterialWidget() → Material: Available on Widget, provided by the GenericExtensions extension
addTooltipWidget(String toolTip) → Tooltip: Available on Widget, provided by the GenericExtensions extension
borderRadius([BorderRadiusGeometry? borderRadius]) → Widget: Available on Widget, provided by the GenericExtensions extension
boxDecoration([BoxDecoration? boxDecoration]) → Widget: Available on Widget, provided by the GenericExtensions extension
build(BuildContext context) → Widget
center({double? heightFactor, double? widthFactor}) → Widget: Available on Widget?, provided by the WidgetExtension extension
set parent widget in center
colorFilter([ColorFilter? colorFilter]) → Widget: Available on Widget, provided by the GenericExtensions extension
set parent widget in center
cornerRadiusWithClipRRect(double radius) → ClipRRect: Available on Widget?, provided by the WidgetExtension extension
add corner radius
cornerRadiusWithClipRRectOnly({int bottomLeft = 0, int bottomRight = 0, int topLeft = 0, int topRight = 0}) → ClipRRect: Available on Widget?, provided by the WidgetExtension extension
add custom corner radius each side
createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → _ReactiveStatelessWidgetState: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
didAddObserverForDebug(List<ReactiveModel> observers) → void: Called in debug mode only when an state is added to the list of listeners
didMountWidget(BuildContext context) → void: Called when the widget is first inserted in the widget tree
didNotifyWidget(SnapState snap) → void: Called when the widget is notified to rebuild, it exposes the SnapState of the state that emits the notification
didUnmountWidget() → void: Called when the widget is removed from the widget tree
expand({int flex = 1}) → Widget: Available on Widget?, provided by the WidgetExtension extension
add Expanded to parent widget
fit({BoxFit? fit, AlignmentGeometry? alignment}) → Widget: Available on Widget?, provided by the WidgetExtension extension
add FittedBox to parent widget
flexible({int flex = 1, FlexFit? fit}) → Widget: Available on Widget?, provided by the WidgetExtension extension
add Flexible to parent widget
launch<T>(BuildContext context, {bool isNewTask = false, PageRouteAnimation? pageRouteAnimation, Duration? duration, String? routeName, Object? routeArguments}) → Future<T?>: Available on Widget?, provided by the WidgetExtension extension
Launch a new screen
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
onTap(Function? function, {BorderRadius? borderRadius, Color? splashColor, Color? hoverColor, Color? highlightColor, Color? focusColor, WidgetStateProperty<Color?>? overlayColor}) → Widget: Available on Widget?, provided by the WidgetExtension extension
add tap to parent widget
opacity({required double opacity, int durationInSecond = 1, Duration? duration}) → Widget: Available on Widget?, provided by the WidgetExtension extension
add opacity to parent widget
paddingAll(double padding) → Padding: Available on Widget?, provided by the WidgetExtension extension
return padding all
paddingBottom(double bottom) → Padding: Available on Widget?, provided by the WidgetExtension extension
return padding bottom
paddingDirectional({double start = 0.0, double top = 0.0, double end = 0.0, double bottom = 0.0}) → Widget: Available on Widget?, provided by the WidgetExtension extension
paddingLeft(double left) → Padding: Available on Widget?, provided by the WidgetExtension extension
return padding left
paddingOnly({double top = 0.0, double left = 0.0, double bottom = 0.0, double right = 0.0}) → Padding: Available on Widget?, provided by the WidgetExtension extension
return custom padding from each side
paddingRight(double right) → Padding: Available on Widget?, provided by the WidgetExtension extension
return padding right
paddingSymmetric({double vertical = 0.0, double horizontal = 0.0}) → Padding: Available on Widget?, provided by the WidgetExtension extension
return padding symmetric
paddingTop(double top) → Padding: Available on Widget?, provided by the WidgetExtension extension
return padding top
rotate({required double angle, bool transformHitTests = true, Offset? origin}) → Widget: Available on Widget?, provided by the WidgetExtension extension
add rotation to parent widget
scale({required double scale, Offset? origin, AlignmentGeometry? alignment, bool transformHitTests = true}) → Widget: Available on Widget?, provided by the WidgetExtension extension
add scaling to parent widget
shouldRebuildWidget(SnapState oldSnap, SnapState currentSnap) → bool: Condition on when to rebuild the widget, it exposes the old and the new SnapState of the the state that emits the notification.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode: Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
tooltip({required String msg}) → Widget: Available on Widget?, provided by the WidgetExtension extension
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String: A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String: Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a one-line detailed description of the object.
inherited
toStringShort() → String: A short, textual description of this widget.
inherited
translate({required Offset offset, bool transformHitTests = true, Key? key}) → Widget: Available on Widget?, provided by the WidgetExtension extension
add translate to parent widget
validate({Widget value = const SizedBox()}) → Widget: Available on Widget?, provided by the WidgetExtension extension
Validate given widget is not null and returns given value if null.
visible(bool visible, {Widget? defaultWidget}) → Widget: Available on Widget?, provided by the WidgetExtension extension
set visibility
withHeight(double height) → SizedBox: Available on Widget?, provided by the WidgetExtension extension
With custom height
withRoundedCorners({Color backgroundColor = whiteColor, BorderRadius borderRadius = const BorderRadius.all(Radius.circular(8.0)), LinearGradient? gradient, BoxBorder? border, List<BoxShadow>? boxShadow, DecorationImage? decorationImage, BoxShape boxShape = BoxShape.rectangle}) → Container: Available on Widget?, provided by the WidgetExtension extension
withScroll({ScrollPhysics? physics, EdgeInsetsGeometry? padding, Axis scrollDirection = Axis.vertical, ScrollController? controller, DragStartBehavior dragStartBehavior = DragStartBehavior.start, bool? primary, required bool reverse}) → Widget: Available on Widget?, provided by the WidgetExtension extension
withShaderMask(List<Color> colors, {BlendMode blendMode = BlendMode.srcATop}) → Widget: Available on Widget?, provided by the WidgetExtension extension
Wrap with ShaderMask widget
withShaderMaskGradient(Gradient gradient, {BlendMode blendMode = BlendMode.srcATop}) → Widget: Available on Widget?, provided by the WidgetExtension extension
Wrap with ShaderMask widget Gradient
withShadow({Color bgColor = whiteColor, Color shadowColor = Colors.black12, dynamic blurRadius = 10.0, dynamic spreadRadius = 0.0, Offset offset = const Offset(0.0, 0.0), LinearGradient? gradient, BoxBorder? border, DecorationImage? decorationImage, BoxShape boxShape = BoxShape.rectangle}) → Container: Available on Widget?, provided by the WidgetExtension extension
withSize({double width = 0.0, double height = 0.0}) → SizedBox: Available on Widget?, provided by the WidgetExtension extension
With custom height and width
withTooltip({required String msg}) → Widget: Available on Widget?, provided by the WidgetExtension extension
Validate given widget is not null and returns given value if null.
withVisibility(bool visible, {Widget? replacement, bool maintainAnimation = false, bool maintainState = false, bool maintainSize = false, bool maintainSemantics = false, bool maintainInteractivity = false}) → Visibility: Available on Widget?, provided by the WidgetExtension extension
set widget visibility
withWidth(double width) → SizedBox: Available on Widget?, provided by the WidgetExtension extension
With custom width

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Properties

addToObs ↔ ObserveReactiveModel?: getter/setter pair