12/22/2023 0 Comments Flutter provider![]() These allow to share information throughout the widget tree and these contain other wigets. How consistent would this seem to you?, that does not make sense.Īlso, the Flutter team came up with InheritedWidgets. Let’s imagine that we want to share information through the widget tree and that every time we travel from one screen to another, we had to share an entity with common data between it. To share information between the widget tree. As I always say, if you want to understand a tool, you have to analyze the problem solved. This definition helps us to understand why was this tool born. Tow expensive widgets return a few Text widgets.On the official Flutter documentation you find this description: “it is a wrapper of the InheritedWidget to make its implementation easier and more reusable.” But that is not the end…□ Of course not. import 'package:flutter/foundation.dart' Īfter that, we’ve created two separate expensive widgets that we’re going to use inside Consumer BuildContext. In this section, we’ve used the same Counter model. Subsequently, we can say, Consumer helps us to lessen the widget rebuilds. The Consumer child is any widget that doesn’t need the data inside of the provider, so when the data gets updated, they don’t get re-created. Here Consumer child may take a vital role here. ![]() Because as the state changes, they will not rebuild. The good news is, when the Consumer widget will call Provider.of with its own BuildContext, inside that BuildContext, we can use any number of expensive widgets without any worry. On the contrary, the Consumer widget, will call Provider.of with its own BuildContext. Therefore, we don’t have to call it explicitly. ![]() However, Consumer can call Provider.of in a new widget. final Counter counter = Provider.of(context) can be called in all the widgets lifecycle, including click handlers and didChangeDependencies Provider.of vs Consumer is a matter of personal preference. Consumer, Selector, and all the *ProxyProvider calls Provider.of to work. Provider.of is the only way to obtain and listen to an object. Let us quote him because he has made the distinction in a lucid way so that a beginner can understand. The creator of provider package Rémi Rousselet has distinguished it in a Stack overflow answer. What is the difference between provider and Consumer? As a result, we can display data (here number) and call any method (here increment) on that provided Counter model. What Consumer does is nothing but exposes instances of provided models. Pressing one method will increment the number and the other method will decrement. We have a Counter model class that has one number variable and and two methods. Therefore, we’ll supplement the proof during this write-up with the help of screenshots.īefore that, for beginners, let’s clarify the role of Consumer. However, we’ve not tested how, at the same time, we can avoid unnecessary widget rebuilds. In our previous section we’ve seen how we can manage state in our flutter app by using Provider.of from Provider package. Actually, Consumer calls Provider.of in a new widget, and delegates its build implementation to builder. Consumer in flutter is an object in the provider library package that obtains Provider from its ancestors and passes its value to builder.
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