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See [ValueStreamHasNoValueError] +/// and [UnhandledStreamError] for more information. /// /// [ValueStreamBuilder] handles building a widget in response to new `data`. /// [ValueStreamBuilder] is analogous to [StreamBuilder] but has simplified API to @@ -161,13 +163,13 @@ class _ValueStreamBuilderState extends State> { final previousData = currentData; currentData = newData; if (buildWhen == null || buildWhen(previousData, newData)) { - setState(_emptyFn); + setState(emptyFn); } }, onError: (Object e, StackTrace s) { error = ErrorAndStackTrace(UnhandledStreamError(e), s); reportError(); - setState(_emptyFn); + setState(emptyFn); }, ); } @@ -185,7 +187,7 @@ class _ValueStreamBuilderState extends State> { properties.add(DiagnosticsProperty('subscription', subscription)); } - static void _emptyFn() {} + static void emptyFn() {} void reportError() { final error = this.error; @@ -215,18 +217,22 @@ class UnhandledStreamError extends Error { @override String toString() { - return '''${_bullet}Unhandled error from the ValueStream: "$error". + return '''${_bullet}Unhandled error emitted from the ValueStream: "$error". + +${_bullet}The ValueStreamBuilder requires the ValueStream to never emit any error events. + +${_bullet}If you are using a BehaviorSubject, ensure you only call subject.add(data), +${_indent}and never call subject.addError(error). -${_bullet}ValueStreamBuilder requires the ValueStream never to emit any error events. -${_indent}You should use one of following methods to handle error before passing stream to ValueStreamBuilder: -$_indent $_bullet stream.handleError((e, s) { }) +${_indent}To handle errors before passing the stream to ValueStreamBuilder, you can use one of the following methods: +$_indent $_bullet stream.handleError((error, stackTrace) { }) $_indent $_bullet stream.onErrorReturn(value) -$_indent $_bullet stream.onErrorReturnWith((e) => value) +$_indent $_bullet stream.onErrorReturnWith((error, stackTrace) => value) $_indent $_bullet stream.onErrorResumeNext(otherStream) -$_indent $_bullet stream.onErrorResume((e) => otherStream) +$_indent $_bullet stream.onErrorResume((error, stackTrace) => otherStream) $_indent $_bullet stream.transform( -$_indent $_indent StreamTransformer.fromHandlers(handleError: (e, s, sink) {})) -$_indent ... +$_indent $_indent StreamTransformer.fromHandlers(handleError: (error, stackTrace, sink) {})) +$_indent ... ${_bullet}If none of these solutions work, please file a bug at: ${_indent}https://github.com/ReactiveX/rxdart/issues/new @@ -243,10 +249,22 @@ class ValueStreamHasNoValueError extends Error { @override String toString() { return '''${_bullet}ValueStreamBuilder requires `hasValue` of "$stream" to be true. -${_indent}You can use BehaviorSubject.seeded(value), publishValueSeeded(value) or shareValueSeeded(value) -${_indent}to create a ValueStream with an initial value. +${_indent}This means the ValueStream must always have the value. + +${_indent}If you are using a BehaviorSubject, use `BehaviorSubject.seeded(value)` +or call `subject.add(value)` to provide an initial value before using ValueStreamBuilder. + +${_indent}Alternatively, you can create a ValueStream with an initial value using: +$_indent $_bullet stream.publishValueSeeded(value) +$_indent $_bullet stream.shareValueSeeded(value) +$_indent ... -${_bullet}Otherwise, you should check `stream.hasValue` before using ValueStreamBuilder. +${_bullet}Lastly, you can check if the ValueStream has a value before using ValueStreamBuilder, for example: +$_indent if (valueStream.hasValue) { +$_indent return ValueStreamBuilder(...); +$_indent } else { +$_indent return FallBackWidget(); +$_indent } ${_bullet}If none of these solutions work, please file a bug at: ${_indent}https://github.com/ReactiveX/rxdart/issues/new