How to Process GraphQL Subscriptions in Flutter

In this blog post, we are going to explain how to work with GraphQL Subscriptions in Flutter. We are going to create a simple counter app that will increase the number by one each time we press a button. We will increase the button with an increment mutation to prevent race conditions between different users. Thus the app will not increment, but the GraphQL endpoint will. After the mutation, we will move on to the subscription to listen to changes.…

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Flutter Drag and Drop Example

For a little game, I needed to drag and drop items. I have never seen it as easy as in Flutter. So in this blog post, we will describe how to implement the drag and drop of checkers on checkerboard in Flutter. The goal is to draw a checkerboard, add checkers, and make it possible for the checkers to be dragged around. For state management, we will use the provider. If this is completely new to you, the previous blog…

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Flutter Provider Example Category Selector

In the latest blog posts, I have been writing about Flutter Hooks to simplify state management in Flutter. We described how to simplify the modal dialog selector of categories with Flutter Hooks. However, Flutter Hooks is not the only solution. Another option is to use a provider which is used in the simple app state management page of Flutter. We will rewrite the modal category dialog selector as an example, except that this time we will use the provider. A…

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Writing Your Own Custom Flutter Hook

We are going to show how to create a custom hook with Flutter Hooks. As an example, we will rewrite a GraphQL query that retrieves race results for drivers in Formula 1. Why would you want to write your own Hook? Mateus discusses the benefits of hooks to React, the same benefits apply for Flutter. Luckily the creators of the Flutter Hooks library have made it really easy to write your own custom Hooks as we will show in this…

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Flutter Hooks useState example

In the previous blog post, we described how to create a dialog for multiple category selection. To do this we had to create two stateful widgets. We also had to override the initState method of the dialog. In React this can be done more easily with Hooks. Luckily there are also Hooks in Flutter that can do the same. In this blog post, we will show you how to rewrite the dialog example with Hooks. Configuring the project Before we…

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Using a modal dialog to choose a value in Flutter

We are going to describe how to show a modal dialog in Flutter. In this dialog, the user will be able to pick some values, that we will return to the original Widget. In the last blog post, we show how to select multiple categories from a list. We are going to work from there. There is a list of values from which we can pick multiple categories. In some cases, we do not want to keep the list visible…

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How to implement a multi-category selector in Flutter

The goal of this blog post is to create a Widget that allows a user to select multiple categories from a list. We are going to use a list of Formula 1 drivers so that users can compare the results of those drivers. We already showed how to query multiple drivers from a GraphQL endpoint, but this was missing a selection of which drivers should be queried. In this blog post, we will show two approaches on how to do…

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Generating Models with Artemis for GraphQL Mutations in Flutter

We are going to describe how to generate models with Artemis for mutations. In the previous blog post, we already showed you to insert a new object at a GraphQL endpoint with a mutation. One of the things that I disliked, coming from more typed based languages (Kotlin, Java) was the way we had to convert the Dart DateTime to a different format before we could insert it. In this blog post, we are going to describe how to generate…

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Generating Models for a GraphQL Endpoint in Flutter

In the previous blog post, we showed how to query a GraphQL Endpoint in Flutter. One of the downsides from this approach was that it is easy to make mistakes when defining the query as a String in the application. Another problem is that there is no typing and if you added typing you would have to keep it in sync with the GraphQL Endpoint. In this blog post, we will show you how to generate models and queries with…

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Querying a GraphQL API in Flutter

GraphQL is gaining more popularity and this will probably only increase in the future. If you need some data storage, there is an increasing chance that you are going to connect to a GraphQL API. For this blog, we are going to assume this endpoint is already there. The endpoint we are going to use is the following. The endpoint returns information about the standing in Formula 1. In the previous blog post, we showed how to draw a line…

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