In this blog post, we’re going to tackle an essential concept when working with rows in Flutter—the
flex property. This guide aims to break down the basics and complexities of using
Why Flex Matters
First off, why should you even care about the
flex property? The answer is simple. The
flex property allows you to distribute available space among child widgets dynamically, giving you greater control over your layouts. This property is your key to responsive design.
Basic Usage of Flex in Row
Let’s start with a straightforward example to show how
flex works with a
Row( children: [ Expanded( flex: 1, child: Container(color: Colors.red), ), Expanded( flex: 2, child: Container(color: Colors.green), ), ], )
In this example, we use the
Expanded widget to wrap around
Container widgets. The
flex property is set to
1 for the first
2 for the second one. This means that the second
Container will take up twice the space compared to the first one.
Advanced Flex Example
Now that you’ve got the basics down, let’s check a slightly more complex example.
Row( children: [ Flexible( flex: 1, child: Container(color: Colors.blue), ), const Spacer(flex: 1), Flexible( flex: 2, child: Container(color: Colors.yellow), ), ], )
Here, we use both
Spacer widgets in the row. While
Flexible allows the child to take up available space,
Spacer acts as an empty space that can also be adjusted using
In this example, the
Spacer with a
1 pushes the containers apart, while the containers themselves adjust their widths based on their
flex property in a Flutter
Row offers an array of possibilities for controlling space distribution among child widgets. Whether you are a beginner or an advanced Flutter developer, understanding how to effectively use
flex can significantly up your layout game.