SizeChangedLayoutNotifierModifier class

A widget that automatically dispatches a SizeChangedLayoutNotification when the layout dimensions of its child change.

The notification is not sent for the initial layout (since the size doesn't change in that case, it's just established).

To listen for the notification dispatched by this widget, use a NotificationListener<SizeChangedLayoutNotification>.

The Material class listens for LayoutChangedNotifications, including SizeChangedLayoutNotifications, to repaint InkResponse and InkWell ink effects. When a widget is likely to change size, wrapping it in a SizeChangedLayoutNotifier will cause the ink effects to correctly repaint when the child changes size.

See also:

• Notification, the base class for notifications that bubble through the widget tree.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• SingleChildStatelessModifier
• SizeChangedLayoutNotifierModifier

Available extensions

• ModifierTransformer

Constructors

SizeChangedLayoutNotifierModifier({Key? key, Widget? child, Key? modifierKey})

Creates a SizeChangedLayoutNotifier that dispatches layout changed notifications when child changes layout size.

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

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

modified() → Modifier

Available on Widget, provided by the ModifierTransformer extension

Transform normal widget to Modifier

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, int wrapWidth = 65}) → 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