Flutter Commands Cheat Sheet

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• Flutter Command Line
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T o add a shel l command: T o o l s Cr e a t e cmd l i n e l a u n ch e r 2. T o open f rom t ermi nal: cd flutter app main folder idea. Flutter IntelliJ cheat sheet (MacOS version) Core workf l ow Run: ctrl-r S t art w/ o breakpoi nt s. Debug: ctrl-d S t art w/ B reakpoi nt s. The following PHP cheat sheet can help you review basic commands, such as before you take a PHP exam. However, since it’s a language, this guide is simply a list of the commands, and more commands can be further explained through other cheat sheets found online.

In this tutorial you will learn how to create a MobX version of the default Flutter 'counter' app.

1. Flutter has a few builtin tools for helping you debug layouts. Flutter Inspector. In Android Studio you can find the Flutter Inspector tab on the far right. Here we see our layout as a widget tree. Visual rendering. You can turn on visual rendering by setting debugPaintSizeEnabled to true in your main function. In your main.dart file replace.
2. A quick cheatsheet of useful snippet for Flutter. A widget is the basic type of controller in Flutter Material. There are two type of basic Widget we can extend our classes: StatefulWidget or StatelessWidget. StatefulWidget are all the widget that interally have a dynamic value that can change during usage.
3. Note that the basename of the part-file must match the containing-file exactly! In the above case, the part file is called todo.g.dart, which matches the todo.dart file in which it is contained. To generate the part-file, you have to run the following command: flutter packages pub run buildrunner watch -delete-conflicting-outputs.

Prepare

1. Before starting this tutorial make sure you have flutter installed and know how to create a new flutter project.
2. Create a new flutter project on your computer to start.

Install Dependencies

Add the following dependencies to your pubspec.yaml file.

Next add the following dev_dependencies:

In your project folder, run this command to fetch all the packages:

At this point you should have all the necessary packages to continue development.

Add a Store

Now, let's create a MobX store. A store in MobX is a way of collecting the related observable state under one class. The store allows us to use annotations and keeps the code simple. Create a new file counter.dart in lib folder and add the following code to it.

The interesting parts here are:

• The abstract class _Counter that includes the Store mixin. All of your store-related code should be placed inside this abstract class. We create a Counter class to blend in the code from the build_runner.
• The generated code will be inside the part file: counter.g.dart, which we include with the part directive. Without this, the build_runner will not produce any output. The generated file contains the _$Counter mixin.

Note

It is essential to use proper casing for the file name, else the build_runnerwill not generate any output.Since our file is called counter.dart, the part file must be named as counter.g.dart (note the lowercase letters)

• The @observable annotation to mark the value as observable.
• Use of @action to mark the increment() method as an action.

Run the following command inside your project folder. This generates the code in counter.g.dart, which we have already included as part file.

On the command-line, here's the output we got from running it. Yours might be slightly different.

Stay on watch

If you are making changes to the store and want to generate *.g.dart files automatically, you can use the following command:

Starting Clean

Sometimes you may have an error running this command due to existing files, possibly generated from an earlier version ofbuild_runner. In that case, you can add the following flag to delete the *.g.dart files before generating them.

Connect the Store and add an Observer to your Widget

Now comes the part where we connect the MobX store to the Widget. In your main.dart file, replace the code with the following:

Flutter Commands Cheat Sheet Printable

You will notice above that we have not used any StatefulWidget instances! The state is stored in the Counter store and the Observer widget reads the counter.value to render the count. Just the simple act of reading the counter.value is enough for the Observer to start tracking and re-render on changes.

And we are done!

Flutter Commands Cheat Sheet Answers

Our end result will look exactly the same as our start! As you tap on the FloatingActionButton, the counter will increment and update automatically.

Flutter Command Line

Keep exploring!

Flutter Build Command

Browse through other examples to get a feel for MobX. It's all about Observables, Actions and Reactions 😇. We have already looked at Observables and Actions. Reactions are covered in other examples.