Expanded class

A widget that expands a child of a Row, Column, or Flex so that the child fills the available space.

Using an Expanded widget makes a child of a Row, Column, or Flex expand to fill the available space along the main axis (e.g., horizontally for a Row or vertically for a Column). If multiple children are expanded, the available space is divided among them according to the flex factor.

An Expanded widget must be a descendant of a Row, Column, or Flex, and the path from the Expanded widget to its enclosing Row, Column, or Flex must contain only StatelessWidgets or StatefulWidgets (not other kinds of widgets, like RenderObjectWidgets).

{@tool dartpad} This example shows how to use an Expanded widget in a Column so that its middle child, a Container here, expands to fill the space.

This results in two thin blue boxes with a larger amber box in between.

** See code in examples/api/lib/widgets/basic/expanded.0.dart ** {@end-tool}

{@tool dartpad} This example shows how to use an Expanded widget in a Row with multiple children expanded, utilizing the flex factor to prioritize available space.

This results in a wide amber box, followed by a thin blue box, with a medium width amber box at the end.

** See code in examples/api/lib/widgets/basic/expanded.1.dart ** {@end-tool}

See also:

Inheritance

Constructors

Expanded.new({Key? key, int flex = 1, required Widget child})
Creates a widget that expands a child of a Row, Column, or Flex so that the child fills the available space along the flex widget's main axis.
const

Properties

child → Widget
The widget below this widget in the tree.
finalinherited
fit → FlexFit
How a flexible child is inscribed into the available space.
finalinherited
flex → int
The flex factor to use for this child.
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createRenderObject() → RenderObject<Flexible>
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited