make RxStreamBuilder extends StreamBuilder

Author: hoc081098

lib/src/rx_stream_builder.dart

@@ -13,51 +13,29 @@ typedef RxWidgetBuilder<T> = Widget Function(BuildContext context, T? data);
 /// Rx stream builder that will pre-populate the streams initial data if the
 /// given stream is an stream that holds the streams current value such
 /// as a [ValueStream] or a [ReplayStream]
-class RxStreamBuilder<T> extends StatelessWidget {
-  final AsyncWidgetBuilder<T> _builder;
-
-  /// The asynchronous computation to which this builder is currently connected,
-  /// possibly null. When changed, the current summary is updated using
-  /// [afterDisconnected], if the previous stream was not null, followed by
-  /// [afterConnected], if the new stream is not null.
-  final Stream<T> stream;
-
-  /// The data that will be used to create the initial snapshot.
-  ///
-  /// Providing this value (presumably obtained synchronously somehow when the
-  /// [Stream] was created) ensures that the first frame will show useful data.
-  /// Otherwise, the first frame will be built with the value null, regardless
-  /// of whether a value is available on the stream: since streams are
-  /// asynchronous, no events from the stream can be obtained before the initial
-  /// build.
-  final T? initialData;
-
+class RxStreamBuilder<T> extends StreamBuilder<T> {
   /// Creates a new [RxStreamBuilder] that builds itself based on the latest
   /// snapshot of interaction with the specified [stream] and whose build
   /// strategy is given by [builder].
   ///
   /// The [initialData] is used to create the initial snapshot.
+  /// See [StreamBuilder.initialData].
   ///
   /// The [builder] must not be null. It must only return a widget and should not have any side
   /// effects as it may be called multiple times.
   RxStreamBuilder({
     Key? key,
     required RxWidgetBuilder<T> builder,
-    required this.stream,
-    this.initialData,
+    required Stream<T> stream,
+    T? initialData,
   })  : assert(builder != null),
         assert(stream != null),
-        _builder = _createStreamBuilder<T>(builder),
-        super(key: key);
-
-  @override
-  Widget build(BuildContext context) {
-    return StreamBuilder<T>(
-      initialData: getInitialData(initialData, stream),
-      builder: _builder,
-      stream: stream,
-    );
-  }
+        super(
+          key: key,
+          initialData: getInitialData(initialData, stream),
+          builder: _createStreamBuilder<T>(builder),
+          stream: stream,
+        );
 
   /// Get latest value from stream or return `null`.
   @visibleForTesting