A box with a specified size.

If given a child, this widget forces its child to have a specific width and/or height (assuming values are permitted by this widget's parent). If either the width or height is null, this widget will size itself to match the child's size in that dimension.

If not given a child, this widget will size itself to the given width and height, treating nulls as zero.

The new SizedBox.expand constructor can be used to make a SizedBox that sizes itself to fit the parent. It is equivalent to setting width and height to double.INFINITY.

Inheritance

Constructors

SizedBox({Key key, double width, double height, Widget child })

Creates a fixed size box. The width and height parameters can be null to indicate that the size of the box should not be constrained in the corresponding dimension.

const
SizedBox.expand({Key key, Widget child })

Creates a box that will become as large as its parent allows.

const
SizedBox.fromSize({Key key, Widget child, Size size })

Creates a box with the specified size.

Properties

height double

If non-null, requires the child to have exactly this height.

final
width double

If non-null, requires the child to have exactly this width.

final
child Widget

The widget below this widget in the tree.

final, inherited
hashCode int

The hash code for this object.

read-only, inherited
key Key

Controls how one widget replaces another widget in the tree.

final, inherited
runtimeType Type

A representation of the runtime type of the object.

read-only, inherited

Methods

createRenderObject(BuildContext context) RenderConstrainedBox

Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.

debugFillDescription(List<String> description) → void

Add additional information to the given description for use by toString.

toStringShort() String

A short, textual description of this widget.

updateRenderObject(BuildContext context, RenderConstrainedBox renderObject) → void

Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject.

createElement() SingleChildRenderObjectElement

RenderObjectWidgets always inflate to a RenderObjectElement subclass.

inherited
didUnmountRenderObject(RenderObject, renderObject) → void

A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.

@protected, inherited
noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited
toString() String

Returns a string representation of this object.

inherited

Operators

operator ==(other) bool

The equality operator.

inherited