KeyedSubtree class Null safety

A widget that builds its child.

Useful for attaching a key to an existing widget.

Inheritance

Constructors

KeyedSubtree({Key? key, required Widget child})
Creates a widget that builds its child.
const
KeyedSubtree.wrap(Widget child, int childIndex)
Creates a KeyedSubtree for child with a key that's based on the child's existing key or childIndex.
factory

Properties

child Widget
The widget below this widget in the tree.
final
hashCode int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
key Key?
Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

build(BuildContext context) Widget
Describes the part of the user interface represented by this widget.
override
createElement() StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
protected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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.
nonVirtual">@nonVirtualinherited

Static Methods

ensureUniqueKeysForList(List<Widget> items, {int baseIndex = 0}) List<Widget>
Wrap each item in a KeyedSubtree whose key is based on the item's existing key or the sum of its list index and baseIndex.