IntrinsicWidthModifier class

A widget that sizes its child to the child's maximum intrinsic width.

This class is useful, for example, when unlimited width is available and you would like a child that would otherwise attempt to expand infinitely to instead size itself to a more reasonable width.

The constraints that this widget passes to its child will adhere to the parent's constraints, so if the constraints are not large enough to satisfy the child's maximum intrinsic width, then the child will get less width than it otherwise would. Likewise, if the minimum width constraint is larger than the child's maximum intrinsic width, the child will be given more width than it otherwise would.

If stepWidth is non-null, the child's width will be snapped to a multiple of the stepWidth. Similarly, if stepHeight is non-null, the child's height will be snapped to a multiple of the stepHeight.

This class is relatively expensive, because it adds a speculative layout pass before the final layout phase. Avoid using it where possible. In the worst case, this widget can result in a layout that is O(N²) in the depth of the tree.

See also:

• Align, a widget that aligns its child within itself. This can be used to loosen the constraints passed to the RenderIntrinsicWidth, allowing the RenderIntrinsicWidth's child to be smaller than that of its parent.
• Row, which when used with CrossAxisAlignment.stretch can be used to loosen just the width constraints that are passed to the RenderIntrinsicWidth, allowing the RenderIntrinsicWidth's child's width to be smaller than that of its parent.
• The catalog of layout widgets.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• SingleChildStatelessModifier
• IntrinsicWidthModifier

Available extensions

• ModifierTransformer

Constructors

IntrinsicWidthModifier({Key? key, Widget? child, Key? modifierKey, double? stepWidth, double? stepHeight})

Creates a widget that sizes its child to the child's intrinsic width.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

modifierKey → Key?

The actual key of the widget, which Modifier wrapped

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

stepHeight → double?

If non-null, force the child's height to be a multiple of this value.

final

stepWidth → double?

If non-null, force the child's width to be a multiple of this value.

final

Methods

build(BuildContext context) → Widget

Describes the part of the user interface represented by this widget.

inherited

buildWithChild(BuildContext context, Widget? child) → Widget

A build method that receives an extra child parameter.

override

createElement() → SingleChildStatelessElement

Create a SingleChildStatelessElement

inherited

debugDescribeChildren() → List<DiagnosticsNode>

Returns a list of DiagnosticsNode objects describing this node's children.

inherited

debugFillProperties(DiagnosticPropertiesBuilder properties) → void

Add additional properties associated with the node.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode

Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.

inherited

toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String

A string representation of this object.

inherited

toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String

Returns a string representation of this node and its descendants.

inherited

toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String

Returns a one-line detailed description of the object.

inherited

toStringShort() → String

A short, textual description of this widget.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited