inherited-widget | 易学教程

Didier Boelens' Reactive Programming BLoC or how to implement an app wide BLoC

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问题 I was looking into quite a few pages to learn how to best implement an app wide bloc (for authentication, user management and initialization). I did not find so much and for a beginner regarding this level of bloc patterns I found it hard to identify a reasonable one. The pattern by Didier Boelens explained here appears to be the most promising one. Is it still a sound pattern (it is from 2018) or did the bloc library evolve in the meantime or did other patterns proved better/easier? What

Didier Boelens' Reactive Programming BLoC or how to implement an app wide BLoC

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Flutter Bloc A adds stream in Bloc B but this stream will not render in UI via StreamBuilder

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来源： https://stackoverflow.com/questions/62630163/flutter-bloc-a-adds-stream-in-bloc-b-but-this-stream-will-not-render-in-ui-via-s

Flutter Error: “Widget cannot build because is already in the process of building”

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问题 I got this error: I/flutter (29346): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ I/flutter (29346): The following assertion was thrown building MainLogic(dirty, state: _MainLogic#9c794): I/flutter (29346): setState() or markNeedsBuild() called during build. I/flutter (29346): This InhWidget widget cannot be marked as needing to build because the framework is already in the I/flutter (29346): process of building widgets. A widget can be

InheritedWidget - The getter was called on null after navigator.push

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问题 I'm having trouble trying to access an InheritedWidget after navigating to a new widget. I have my top level widget like this class App extends StatelessWidget{ build(context){ return MaterialApp( title: 'Iniciar Sesion', home: LoginBlocProvider(child: WelcomeScreen()), ); } } Then WelcomeScreen has a button to navigate to LoginScreen class WelcomeScreen extends StatelessWidget { @override Widget build(BuildContext context){ return Scaffold( body: Center(child: MyButton) ); } } class MyButton

How do you create Services/Providers in Flutter?

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问题 Let's say I need a user service which has all my user variables and functions, and another item service with all item variables and functions, etc etc. I want all this data and functions available throughout the project, passing the user data where it's needed, for example. I suspect it has something to do with inherited widgets, but how does that work? Like, I see how I could use one inherited widget at the root level, but am I supposed to build a bunch of inherited widgets at the root-level

How do you create Services/Providers in Flutter?

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Let's say I need a user service which has all my user variables and functions, and another item service with all item variables and functions, etc etc. I want all this data and functions available throughout the project, passing the user data where it's needed, for example. I suspect it has something to do with inherited widgets, but how does that work? Like, I see how I could use one inherited widget at the root level, but am I supposed to build a bunch of inherited widgets at the root-level for each service? Or just put ALL the data in the one top inherited widget? Seems like that may get

Get access to the context of InheritedWidget

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I am having the following setup: MaterialApp(home:SplashScreen) SplashScreen( ///do some auth checks then Navigator.of(context).push( MaterialPageRoute( builder: (_) => StateInheritedWidget( user: userData, child: HomePage(), ))) ) Then in my HomePage I have a FAB that pushes a new route. This new route has no access to the context of my inherited widget. Is it impossible to get the context of an InheritedWidget in new routes, or is there a way to solve this issue ? Update This is my MaterialApp's builder property builder: (context,child){ ///Doing some auth stuff here return new

Get access to the context of InheritedWidget

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问题 I am having the following setup: MaterialApp(home:SplashScreen) SplashScreen( ///do some auth checks then Navigator.of(context).push( MaterialPageRoute( builder: (_) => StateInheritedWidget( user: userData, child: HomePage(), ))) ) Then in my HomePage I have a FAB that pushes a new route. This new route has no access to the context of my inherited widget. Is it impossible to get the context of an InheritedWidget in new routes, or is there a way to solve this issue ? Update This is my