How to Use Expanded in a SingleChildScrollView ?

• General

Expanded Widget is a Widget that expands a child of a Row Widget, Column Widget, or Flex so that the child fills the available space. So now in this article, We will learn about How to Use Expanded in a SingleChildScrollView?

Flutter offers a rich set of widgets for building flexible user interfaces, and the combination of “Expanded” and “SingleChildScrollView” can be a powerful tool in your toolkit. The “Expanded” widget allows a child widget to occupy the remaining available space within its parent, while the “SingleChildScrollView” enables scrolling when the content exceeds the visible area.

In our latest blog post, we’ll guide you through the ins and outs of using the “Expanded” widget in conjunction with a “SingleChildScrollView” in Flutter. If you’ve ever encountered the need to create a scrolling layout with flexible content that adapts to different screen sizes, this blog post is for you. We’ll walk you step by step on how to effectively utilize the “Expanded” widget within a “SingleChildScrollView” to create dynamic and responsive UIs. Get ready to master the art of designing scrollable layouts with expandable content in Flutter and enhance the user experience of your app.

Use of Expanded in a SingleChildScrollView?

When Column Widget is inside a view that is scrollable, the column is trying to shrink-wrap its content but since you used Expanded as a child of the column it is working opposite to the column trying to shrink-wrap its children. This is causing this error because these two directives are completely opposite to each other.

Users can also try the Layout Builder Class below Code Snippet.

LayoutBuilder(
  builder: (context, constraint) {
    return SingleChildScrollView(
      child: ConstrainedBox(
        constraints: BoxConstraints(minHeight: constraint.maxHeight),
        child: IntrinsicHeight(
          child: Column(
            children: <Widget>[
              Text("Header"),
              Expanded(
                child: Container(
                  color: Colors.red,
                ),
              ),
              Text("Footer"),
            ],
          ),
        ),
      ),
    );
  },
)

User can also give a try to CustomScrollView Widget Code Snippet will look like a below:

CustomScrollView(
  slivers: [
    SliverFillRemaining(
      hasScrollBody: false,
      child: Column(
        children: <Widget>[
          const Text('Header'),
          Expanded(child: Container(color: Colors.red)),
          const Text('Footer'),
        ],
      ),
    ),
  ],
)

User can Simply Wrap a SingleChildScrollView in a Center or Align Widget like the below:

Align(
    alignment: Alignment.topCenter,
    child: SingleChildScrollView(
      child: Column(
        children: <Widget>[
          ...
        ]
      }
    }
  }

or

Center(
  child: SingleChildScrollView(
    child: Column(
      children: <Widget>[
        ...
      ]
    }
  }
}

Conclusion:

In this article, we have been through How to Use Expanded Widget in a SingleChildScrollView Widget?

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Written by Abhishek Dhanani

Abhishek Dhanani, a skilled software developer with 3+ years of experience, masters Dart, JavaScript, TypeScript, and frameworks like Flutter and NodeJS. Proficient in MySQL, Firebase, and cloud platforms AWS and GCP, he delivers innovative digital solutions.