IndexedStack class Null safety

A Stack that shows a single child from a list of children.

The displayed child is the one with the given index. The stack is always as big as the largest child.

If value is null, then nothing is displayed.

This example shows a IndexedStack widget being used to lay out one card at a time from a series of cards, each keeping their respective states.
To create a local project with this code sample, run:
flutter create --sample=widgets.IndexedStack.1 mysample

See also:



IndexedStack({Key? key, AlignmentGeometry alignment = AlignmentDirectional.topStart, TextDirection? textDirection, StackFit sizing = StackFit.loose, int? index = 0, List<Widget> children = const <Widget>[]})
Creates a Stack widget that paints a single child.


alignment AlignmentGeometry
How to align the non-positioned and partially-positioned children in the stack.
final, inherited
children List<Widget>
The widgets below this widget in the tree.
final, inherited
clipBehavior Clip
The content will be clipped (or not) according to this option.
final, inherited
fit StackFit
How to size the non-positioned children in the stack.
final, inherited
hashCode int
The hash code for this object.
@nonVirtual, read-only, inherited
index int?
The index of the child to show.
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
textDirection TextDirection?
The text direction with which to resolve alignment.
final, inherited


createElement() MultiChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
createRenderObject(BuildContext context) RenderIndexedStack
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
didUnmountRenderObject(covariant 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.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
toString({DiagnosticLevel minLevel =}) String
A string representation of this object.
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants.
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object.
toStringShort() String
A short, textual description of this widget.
updateRenderObject(BuildContext context, covariant RenderIndexedStack 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.


operator ==(Object other) bool
The equality operator.
@nonVirtual, inherited