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Merge pull request #24 from zino-app/providers-1
`GraphqlProvider` and `GraphqlConsumer` widgets
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| import 'package:flutter/widgets.dart'; | ||
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| import 'package:graphql_flutter/src/client.dart'; | ||
| import 'package:graphql_flutter/src/widgets/graphql_provider.dart'; | ||
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| typedef Widget GraphqlConsumerBuilder(Client client); | ||
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| class GraphqlConsumer extends StatelessWidget { | ||
| GraphqlConsumer({ | ||
| final Key key, | ||
| @required this.builder, | ||
| }) : super(key: key); | ||
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| final GraphqlConsumerBuilder builder; | ||
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| Widget build(BuildContext context) { | ||
| /// Gets the client from the closest wrapping [GraphqlProvider]. | ||
| Client client = GraphqlProvider.of(context).value; | ||
| assert(client != null); | ||
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| return builder(client); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| import 'package:flutter/widgets.dart'; | ||
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| import 'package:graphql_flutter/src/client.dart'; | ||
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| class GraphqlProvider extends StatefulWidget { | ||
| const GraphqlProvider({ | ||
| Key key, | ||
| this.client, | ||
| this.child, | ||
| }) : super(key: key); | ||
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| final ValueNotifier<Client> client; | ||
| final Widget child; | ||
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| static ValueNotifier<Client> of(BuildContext context) { | ||
| _InheritedGraphqlProvider inheritedGraphqlProvider = | ||
| context.inheritFromWidgetOfExactType(_InheritedGraphqlProvider); | ||
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| return inheritedGraphqlProvider.client; | ||
| } | ||
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| @override | ||
| State<StatefulWidget> createState() => new _GraphqlProviderState(); | ||
| } | ||
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| class _GraphqlProviderState extends State<GraphqlProvider> { | ||
| void didValueChange() => setState(() {}); | ||
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| @override | ||
| initState() { | ||
| super.initState(); | ||
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| widget.client.addListener(didValueChange); | ||
| } | ||
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| @override | ||
| dispose() { | ||
| widget.client?.removeListener(didValueChange); | ||
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| super.dispose(); | ||
| } | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return new _InheritedGraphqlProvider( | ||
| client: widget.client, | ||
| child: widget.child, | ||
| ); | ||
| } | ||
| } | ||
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| class _InheritedGraphqlProvider extends InheritedWidget { | ||
| _InheritedGraphqlProvider({ | ||
| this.client, | ||
| this.child, | ||
| }) : clientValue = client.value; | ||
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| final ValueNotifier<Client> client; | ||
| final Widget child; | ||
| final Client clientValue; | ||
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| @override | ||
| bool updateShouldNotify(_InheritedGraphqlProvider oldWidget) { | ||
| return clientValue != oldWidget.clientValue; | ||
| } | ||
| } |
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