Flutter row width

Flutter Row Width

When working with rows in Flutter, the width of the row is determined by its children and the available space. Here are a few scenarios that explain how the row’s width is calculated.

1. Equal Width Distribution:

If you want the children of the row to have equal width distribution, you can use the Expanded widget on each child. The Expanded widget tells the row to give equal space to all its children.

  
  Row(
    children: [
      Expanded(
        child: Container(
          color: Colors.red,
          height: 100,
        ),
      ),
      Expanded(
        child: Container(
          color: Colors.blue,
          height: 100,
        ),
      ),
      Expanded(
        child: Container(
          color: Colors.green,
          height: 100,
        ),
      ),
    ],
  )
  
  

In this example, each Container widget inside the Row has an Expanded widget as its parent. This will distribute the available space equally among all the containers, resulting in each container having the same width.

2. Width Calculation using Constraints:

If the row has children with fixed widths, such as Text widgets, the Row will shrink or expand to accommodate the width of its children.

  
  Row(
    children: [
      Text('Hello'),
      Text('World'),
    ],
  )
  
  

In this example, the Row will calculate its width based on the widths of the two Text widgets. If the text is long, the row might overflow horizontally.

3. Width Calculation with Wrapped Content:

If the row’s children cannot fit within the available width, Flutter wraps the content. This means that the children will be placed on multiple lines.

  
  Row(
    children: [
      Container(
        color: Colors.red,
        height: 100,
      ),
      Container(
        color: Colors.blue,
        height: 100,
      ),
      Container(
        color: Colors.green,
        height: 100,
      ),
    ],
  )
  
  

In this example, if the width of the Row is insufficient to accommodate all the Container widgets, Flutter will wrap the containers to the next line until all the children are displayed.