provider

问题 I am quite new to this framework and working on state management using provider package where I come across changeNotifierProvider and ChangeNotifierProvider.value but I am unable to distinguish their use case. I had used ChangeNotifierProvider in place of ChangeNotifierProvider.value but doesn't work as intended. 回答1: Does the official documentation help? DO use ChangeNotifierProvider.value to provider an existing ChangeNotifier : ChangeNotifierProvider.value( value: variable, child: ... )

问题 I'm using the Provider Package to manage state in my Flutter App. I am running into issues when I start nesting my objects. A very simple example: Parent A has child of type B, which has child of type C, which has child of type D. In child D, I want to manage a color attribute. Code example below: import 'package:flutter/material.dart'; class A with ChangeNotifier { A() {_b = B();} B _b; B get b => _b; set b(B value) { _b = value; notifyListeners(); } } class B with ChangeNotifier { B() {_c =

问题 I'm using the Provider Package to manage state in my Flutter App. I am running into issues when I start nesting my objects. A very simple example: Parent A has child of type B, which has child of type C, which has child of type D. In child D, I want to manage a color attribute. Code example below: import 'package:flutter/material.dart'; class A with ChangeNotifier { A() {_b = B();} B _b; B get b => _b; set b(B value) { _b = value; notifyListeners(); } } class B with ChangeNotifier { B() {_c =

问题 I'm working through understanding how the Provider package works with Flutter but confused on how listen:false works. I wrote some basic code using the usual Counter example from a new Flutter project. I created three types of stateless widgets each using a Provider: Provider.of(context) Consumer Provider.of(context, listen: false) The third example was to show how access the provider object and call methods on it without it rebuilding. When I run the application all of the widget counts are

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago . I want to use the Java Persistence API (JPA) for my web application. There are popular JPA implementations like Hibernate , Toplink and EclipseLink . What implementation is a good choise and why? 回答1: When the Java Persistence API (API) was developed, it became popular very

问题 I have having some issues in a Firebase login. I'm trying to make with Provider.The problem is that my login is not refreshing the UI, even thought the data changes and when i hit hot restart it shows me the new UI. Doing some experiments I got into the conclusion that the problem is on a Navigator.push i use to show an animation. I don't wanna lose this animation it gives a pretty cool style to my an app. Is there any way the main provider can can work after a new page is push? Main.dart

问题 What is the meaning of "Provider" in ASP.NET Provider? For example when we are speaking about AuthorizationRuleProvider , connectionStrings.providerName , ...? 回答1: It's a design pattern: The Provider model. There is some good information in this SO Q&A as well: Designing loosely coupled components in .NET - Provider Pattern 回答2: It's just a concrete implementation of an abstract interface. You can select an appropriate provider to fulfill the requirements of the interface at runtime. 回答3:

问题 What is the meaning of "Provider" in ASP.NET Provider? For example when we are speaking about AuthorizationRuleProvider , connectionStrings.providerName , ...? 回答1: It's a design pattern: The Provider model. There is some good information in this SO Q&A as well: Designing loosely coupled components in .NET - Provider Pattern 回答2: It's just a concrete implementation of an abstract interface. You can select an appropriate provider to fulfill the requirements of the interface at runtime. 回答3:

问题 I've created an app and I have used MultiProvider but it doesn't work when I use it inside MaterialApp I want to use it to change app theme color but it gives me an error: *Note: when I use posts provider in any other screen it works. My Code: import 'package:blog_app/provider/posts.dart'; import 'package:blog_app/provider/settings.dart'; import 'package:blog_app/screens/splash_screen.dart'; import 'package:flutter/material.dart'; import 'package:provider/provider.dart'; void main() { runApp

问题 With the preview 2 release of ASP.NET MVC 2, we now have base classes to implement our own custom providers for metadata and validation. Specifically, with ModelMetadataProvider and ModelValidatorProvider. There isn't a lot of documentation on these yet (just released yesterday as a preview , so I'm neither surprised nor disappointed). Has anyone gotten custom implementations of either of these working? A very simple example (metadata and validator for just "Required") would be great! Perhaps