Merge pull request #11

improve_view_model

CHANGELOG.md

@@ -1,5 +1,11 @@
+## 0.5.4
+StateFlow watch added in experimental
+- Added ChangeNotifierProvider.value
+- Removed VMP bug
+- stateFlow.watch(context) added in experimental
+
 ## 0.5.3
-Fixed ViewModel Dispose major bug
+Fixed ViewModel dispose major bug
 - ViewModel not disposing fixed
 - Responsive Example added
 

README.md

@@ -228,6 +228,14 @@ StateFlowBuilder(
 )
 ```
 
+
+### Experimental `StateFlow.watch(BuildContext)`
+We can use `watch` with any `StateFlow` which observe the value change and update the ui. 
+This is similar to Provider's `context.watch<MyChangeNotifier>()`. 
+```dart
+final value = context.vm<CustomViewModel>().myStateFlow.watch(context);
+```
+
 ### StateFlowConsumer
 
 `StateFlowConsumer` is used to rebuild the widgets inside of it and call the listener.

example/pubspec.lock

@@ -176,7 +176,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.5.3"
+    version: "0.5.4"
 sdks:
   dart: ">=2.18.6 <3.0.0"
   flutter: ">=1.17.0"

lib/src/flow.dart

@@ -27,7 +27,35 @@ class StateFlow<T> extends ChangeNotifier {
 
   /// If [notifyOnSameValue] is set to false, whenever you call `stateFlow.value = newValue`
   /// where newValue is same as current value, it will not notify listeners. by default it is set to true.
-  StateFlow(this._value, {this.notifyOnSameValue = true});
+  StateFlow(this._value, {this.notifyOnSameValue = true}) {
+    addListener(_defaultListener);
+  }
+
+  /// watch is experimental for now, it will rebuild the widget of context when value is changed or updated.
+  T watch(BuildContext context) {
+    contexts[context] = true;
+    return _value;
+  }
+
+  final Map<BuildContext, bool> contexts = {};
+
+  @override
+  void dispose() {
+    contexts.clear();
+    removeListener(_defaultListener);
+    super.dispose();
+  }
+
+  void _defaultListener() {
+    for (final context in contexts.keys) {
+      try {
+        if (context is Element) {
+          (context).markNeedsBuild();
+        }
+      } catch (_) {}
+    }
+    contexts.clear();
+  }
 }
 
 /// [MutableStateFlow] is inherited from [StateFlow]. It can change/update the value.

lib/src/modified_provider.dart

@@ -12,6 +12,18 @@ class ChangeNotifierProvider<T extends ChangeNotifier>
   ChangeNotifierProvider(
       {super.key, required super.create, super.child, super.lazy});
 
+  ChangeNotifierProvider.value({
+    Key? key,
+    required T value,
+    TransitionBuilder? builder,
+    Widget? child,
+  }) : super.value(
+          key: key,
+          builder: builder,
+          value: value,
+          child: child,
+        );
+
   static F of<F extends ChangeNotifier>(BuildContext context,
           {bool listen = true}) =>
       p.Provider.of<F>(context, listen: true);

lib/src/view_model_provider.dart

@@ -1,22 +1,11 @@
 import 'package:flutter/widgets.dart';
 import 'package:provider/provider.dart';
-import 'package:provider/single_child_widget.dart';
 
 import 'provider_single_child_widget.dart';
 import 'view_model.dart';
 
 /// [ViewModelProvider] is used to wrap the widget with your custom [ViewModel].
 /// This requires [create] which accepts custom [ViewModel] and [child] Widget.
-class VMP<T extends ViewModel> extends SingleChildStatelessWidget {
-  const VMP({super.key, super.child});
-
-  @override
-  Widget buildWithChild(BuildContext context, Widget? child) {
-    // TODO: implement buildWithChild
-    throw UnimplementedError();
-  }
-}
-
 class ViewModelProvider<T extends ViewModel> extends Provider<T>
     with ProviderSingleChildWidget {
   ViewModelProvider(
@@ -28,7 +17,6 @@ class ViewModelProvider<T extends ViewModel> extends Provider<T>
       : super(dispose: _dispose);
 
   static void _dispose<T extends ViewModel>(BuildContext context, T viewModel) {
-    debugPrint('provider dispose');
     viewModel.dispose();
   }
 

pubspec.yaml

@@ -1,6 +1,6 @@
 name: view_model_x
 description: An Android similar state management package (StateFlow and SharedFlow with ViewModel) which helps to implement MVVM pattern easily.
-version: 0.5.3
+version: 0.5.4
 homepage: https://github.com/shubham-gupta-16/view_model_x
 repository: https://github.com/shubham-gupta-16/view_model_x
 issue_tracker: https://github.com/shubham-gupta-16/view_model_x/issues