FilterChip class Null safety

A Material Design filter chip.

Filter chips use tags or descriptive words as a way to filter content.

Filter chips are a good alternative to Checkbox or Switch widgets. Unlike these alternatives, filter chips allow for clearly delineated and exposed options in a compact area.

Requires one of its ancestors to be a Material widget.

class ActorFilterEntry {
  const ActorFilterEntry(, this.initials);
  final String name;
  final String initials;

class CastFilter extends StatefulWidget {
  const CastFilter({super.key});

  State createState() => CastFilterState();

class CastFilterState extends State<CastFilter> {
  final List<ActorFilterEntry> _cast = <ActorFilterEntry>[
    const ActorFilterEntry('Aaron Burr', 'AB'),
    const ActorFilterEntry('Alexander Hamilton', 'AH'),
    const ActorFilterEntry('Eliza Hamilton', 'EH'),
    const ActorFilterEntry('James Madison', 'JM'),
  final List<String> _filters = <String>[];

  Iterable<Widget> get actorWidgets {
    return actor) {
      return Padding(
        padding: const EdgeInsets.all(4.0),
        child: FilterChip(
          avatar: CircleAvatar(child: Text(actor.initials)),
          label: Text(,
          selected: _filters.contains(,
          onSelected: (bool value) {
            setState(() {
              if (value) {
              } else {
                _filters.removeWhere((String name) {
                  return name ==;

  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
          children: actorWidgets.toList(),
        Text('Look for: ${_filters.join(', ')}'),

Material Design 3

FilterChip can be used for multiple select Filter chip from Material Design 3. If ThemeData.useMaterial3 is true, then FilterChip will be styled to match the Material Design 3 specification for Filter chips. Use ChoiceChip for single select Filter chips.

See also:

  • Chip, a chip that displays information and can be deleted.
  • InputChip, a chip that represents a complex piece of information, such as an entity (person, place, or thing) or conversational text, in a compact form.
  • ChoiceChip, allows a single selection from a set of options. Choice chips contain related descriptive text or categories.
  • ActionChip, represents an action related to primary content.
  • CircleAvatar, which shows images or initials of people.
  • Wrap, A widget that displays its children in multiple horizontal or vertical runs.
Implemented types


FilterChip({Key? key, Widget? avatar, required Widget label, TextStyle? labelStyle, EdgeInsetsGeometry? labelPadding, bool selected = false, required ValueChanged<bool>? onSelected, double? pressElevation, Color? disabledColor, Color? selectedColor, String? tooltip, BorderSide? side, OutlinedBorder? shape, Clip clipBehavior = Clip.none, FocusNode? focusNode, bool autofocus = false, Color? backgroundColor, EdgeInsetsGeometry? padding, VisualDensity? visualDensity, MaterialTapTargetSize? materialTapTargetSize, double? elevation, Color? shadowColor, Color? surfaceTintColor, IconThemeData? iconTheme, Color? selectedShadowColor, bool? showCheckmark, Color? checkmarkColor, ShapeBorder avatarBorder = const CircleBorder()})
Create a chip that acts like a checkbox.


autofocus bool
True if this widget will be selected as the initial focus when no other node in its scope is currently focused.
avatar Widget?
A widget to display prior to the chip's label.
avatarBorder ShapeBorder
The shape of the translucent highlight painted over the avatar when the selected property is true.
backgroundColor Color?
Color to be used for the unselected, enabled chip's background.
checkmarkColor Color?
Color of the chip's check mark when a check mark is visible.
clipBehavior Clip
The content will be clipped (or not) according to this option.
disabledColor Color?
The color used for the chip's background to indicate that it is not enabled.
elevation double?
Elevation to be applied on the chip relative to its parent.
focusNode FocusNode?
An optional focus node to use as the focus node for this widget.
hashCode int
The hash code for this object.
@nonVirtual, read-only, inherited
iconTheme IconThemeData?
Theme used for all icons in the chip.
isEnabled bool
Whether or not this chip is enabled for input.
read-only, override
key Key?
Controls how one widget replaces another widget in the tree.
final, inherited
label Widget
The primary content of the chip.
labelPadding EdgeInsetsGeometry?
The padding around the label widget.
labelStyle TextStyle?
The style to be applied to the chip's label.
materialTapTargetSize MaterialTapTargetSize?
Configures the minimum size of the tap target.
onSelected ValueChanged<bool>?
Called when the chip should change between selected and de-selected states.
padding EdgeInsetsGeometry?
The padding between the contents of the chip and the outside shape.
pressElevation double?
Elevation to be applied on the chip relative to its parent during the press motion.
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
selected bool
Whether or not this chip is selected.
selectedColor Color?
Color to be used for the chip's background, indicating that it is selected.
selectedShadowColor Color?
Color of the chip's shadow when the elevation is greater than 0 and the chip is selected.
shadowColor Color?
Color of the chip's shadow when the elevation is greater than 0.
shape OutlinedBorder?
The OutlinedBorder to draw around the chip.
showCheckmark bool?
Whether or not to show a check mark when SelectableChipAttributes.selected is true.
side BorderSide?
The color and weight of the chip's outline.
surfaceTintColor Color?
Color of the chip's surface tint overlay when its elevation is greater than 0.
tooltip String?
Tooltip string to be used for the body area (where the label and avatar are) of the chip.
visualDensity VisualDensity?
Defines how compact the chip's layout will be.


build(BuildContext context) Widget
Describes the part of the user interface represented by this widget.
createElement() StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
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.
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.


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