Row widget in Flutter uses to display the multiple child widgets in horizontally. Row widget accepts an array of child and you can add any no of widgets.

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But when using a row widget there are some tips you need to remember

Flutter Cheat Sheet by cheatflutter - Cheatography.com Created Date: 5704Z.

1. Row widget is not a scrollable widget
2. Row widget cannot have a more widget than it can show in the available room and it consider as an error.

The row adjusts its size based on the child content. Therefore you can control the height of the row by controlling the height of the child widgets.

If you want to add space between child widget inside a row there are multiples ways to do that.

You Can simply add a SizedBox to add space between widgets.

Adding Spacer widget between the two widgets will also make a space between those widgets. It will take all the available space and align other widgets to the left corner and right corner

There is no direct property to set the background colour to Row widget. But you can wrap row inside a Container and add a background colour to the container

Row normally takes available space and we can control that by wrapping inside a Container or SizedBox widget. You can wrap the Row inside the Container and add width to the container. Then the Row will take the same width as a Container

If you added a widget which can’t fit into the current frame, it will show an error with the yellow strip by saying overflow. This happens because the row widget is not scrollable.

There are mainly two solutions for that.

1. If you need to show all items in a horizontal row you must use ListView instead of Row
2. If you want to move an item to next row you can use Wrap widget instead of row widget

The main axis of the Row widget is x-axis( horizontal way). There are multiple ways to align in the main axis.

Align all children to close to the start of the main Axis. This start position identify based on the text direction. If you set textDirection to TextDirection.rtl it will consider start position as right instead of left.

Align all children to end of the main axis. End position identifies base on textDirection.

Place space evenly between the children and also half of the space before and after the first and the last child

Place space evenly between the children as well as space before and after the first and last child

In the Row widget vertical direction consider as the cross axis. There are multiple properties available to align in Cross Axis.

This will place the children with their start edge align with the start of the cross axis. verticalDirection property can use to specify the direction whether from down to top or top to down

This will place the children to the end of the cross axis.

This will place the children to align their center to the middle of cross axis

Place children alone cross axis to match baseline. When you use baseline you has to set textBaseline property also.

I hope you get a better idea about row widget and how to use each property. If you have any question please comment down below

MobX has a pretty small API surface and tries to get out of your way as much as possible. Although minimal, there are few concepts youshould be familiar with. This guide is meant to be a crash course in MobX.

Required Packages

Make sure to have the following packages installed for working effectively with MobX and Flutter:

The main MobX package that includes Observables, Actions, and Reactions

Provides the Observer widget that auto-renders when the tracked observables change.

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A powerful code-generator that greatly improves the developer experience with MobX. It provides annotations like@observable, @computed, @action which hides all the boilerplate in a separately generated file, *.g.dart. Cdr to ai for mac os.

These packages should appear in your pubspec.yaml like below.

Declaring a Store class

Every store in MobX should be declared with the following boilerplate. This is probably the only boilerplate thatgets repeated. You could make this into a code-snippet in your IDE. Below, we are declaring a Todo store.

Note that the basename of the part-file must match the containing-file exactly! In the above case, the partfile 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:

Ya, it looks like a mouthful 🙃 but it does the job!

Adding @observable, @computed, @action

Observables are the reactive state of your store and Actions are semantic operations that mutate them. ComputedObservables are read-only properties that depend on other observables and auto-update when any of the dependentobservables change.

Reactive wrappers

MobX also comes with a set of wrapper-classes that add the reactive behavior. These include:

• ObservableList<T>
• ObservableSet<T>
• ObservableMap<K,V>
• ObservableFuture<T>
• ObservableStream<T>

Reactive Extensions

You can convert plain List, Map, Set, Future and Stream instances into an observable version with the asObservable() extension method.For example, in the code-snippet above, you could do:

Flutter Mainaxisalignment

Don't underestimate the @computed

Column Cheat Sheet Flutter

Although @computed looks like a simple, readonly observable, it can easily be your most powerful tool.By creating @computed properties that depend on other observables, you can dramatically simplify the UI code andeliminate most of the business logic inside your Widgets. It is most often used for hiding conditional logic andcalculating some derived information.

For example, rather than checking if some data is loaded successfully inside a Widget..

..you can create a @computed property called hasResults..

..and simplify your widget logic..

Cheat Sheet Fluttershy

..Since a @computed property is an observable, the Observer will automatically render when it changes!

Adding reactions

Reactions, as the name suggests, react to changes in observables. Without reactions, it would be a boring systemthat only produces changes in observables but nothing visible or useful ever happens because there are no reactions!

There are 3 types of reactions: autorun, reaction, when. Each reaction returns a ReactionDisposer, which when called will disposethe reaction. Disposing a reaction stops tracking the observables.

• autorun: Is a long-running reaction and starts tracking immediately.

• reaction: Is a long-running reaction and starts tracking only after the first change. It runs the effect whenany tracked observables change.

Flutter Cheat Sheet Pdf

Cheat Sheet Fluttering

• when: a reaction that waits for a condition to become true before running the effect. After running the effect,it automatically disposes. Thus when is a one-time only reaction!.