SwitchListTile class Null safety

A ListTile with a Switch. In other words, a switch with a label.

The entire list tile is interactive: tapping anywhere in the tile toggles the switch. Tapping and dragging the Switch also triggers the onChanged callback.

To ensure that onChanged correctly triggers, the state passed into value must be properly managed. This is typically done by invoking State.setState in onChanged to toggle the state value.

The value, onChanged, activeColor, activeThumbImage, and inactiveThumbImage properties of this widget are identical to the similarly-named properties on the Switch widget.

The title, subtitle, isThreeLine, and dense properties are like those of the same name on ListTile.

The selected property on this widget is similar to the ListTile.selected property. This tile's activeColor is used for the selected item's text color, or the theme's ThemeData.toggleableActiveColor if activeColor is null.

This widget does not coordinate the selected state and the value; to have the list tile appear selected when the switch button is on, use the same value for both.

The switch is shown on the right by default in left-to-right languages (i.e. in the ListTile.trailing slot) which can be changed using controlAffinity. The secondary widget is placed in the ListTile.leading slot.

This widget requires a Material widget ancestor in the tree to paint itself on, which is typically provided by the app's Scaffold. The tileColor, and selectedTileColor are not painted by the SwitchListTile itself but by the Material widget ancestor. In this case, one can wrap a Material widget around the SwitchListTile, e.g.:

Container(
  color: Colors.green,
  child: Material(
    child: SwitchListTile(
      tileColor: Colors.red,
      title: const Text('SwitchListTile with red background'),
      value: true,
      onChanged:(bool? value) { },
    ),
  ),
)

Performance considerations when wrapping SwitchListTile with Material

Wrapping a large number of SwitchListTiles individually with Materials is expensive. Consider only wrapping the SwitchListTiles that require it or include a common Material ancestor where possible.

To show the SwitchListTile as disabled, pass null as the onChanged callback.

This widget shows a switch that, when toggled, changes the state of a bool member field called _lights.

To create a local project with this code sample, run:
flutter create --sample=material.SwitchListTile.2 mysample

Semantics in SwitchListTile

Since the entirety of the SwitchListTile is interactive, it should represent itself as a single interactive entity.

To do so, a SwitchListTile widget wraps its children with a MergeSemantics widget. MergeSemantics will attempt to merge its descendant Semantics nodes into one node in the semantics tree. Therefore, SwitchListTile will throw an error if any of its children requires its own Semantics node.

For example, you cannot nest a RichText widget as a descendant of SwitchListTile. RichText has an embedded gesture recognizer that requires its own Semantics node, which directly conflicts with SwitchListTile's desire to merge all its descendants' semantic nodes into one. Therefore, it may be necessary to create a custom radio tile widget to accommodate similar use cases.

Here is an example of a custom labeled radio widget, called LinkedLabelRadio, that includes an interactive RichText widget that handles tap gestures.

To create a local project with this code sample, run:
flutter create --sample=material.SwitchListTile.3 mysample

SwitchListTile isn't exactly what I want

If the way SwitchListTile pads and positions its elements isn't quite what you're looking for, you can create custom labeled switch widgets by combining Switch with other widgets, such as Text, Padding and InkWell.

Here is an example of a custom LabeledSwitch widget, but you can easily make your own configurable widget.

To create a local project with this code sample, run:
flutter create --sample=material.SwitchListTile.4 mysample

Constructors

SwitchListTile({Key? key, required bool value, required ValueChanged<bool>? onChanged, Color? tileColor, Color? activeColor, Color? activeTrackColor, Color? inactiveThumbColor, Color? inactiveTrackColor, ImageProvider<Object>? activeThumbImage, ImageProvider<Object>? inactiveThumbImage, Widget? title, Widget? subtitle, bool isThreeLine = false, bool? dense, EdgeInsetsGeometry? contentPadding, Widget? secondary, bool selected = false, bool autofocus = false, ListTileControlAffinity controlAffinity = ListTileControlAffinity.platform, ShapeBorder? shape, Color? selectedTileColor, VisualDensity? visualDensity, FocusNode? focusNode, bool? enableFeedback, Color? hoverColor}): Creates a combination of a list tile and a switch.
const
SwitchListTile.adaptive({Key? key, required bool value, required ValueChanged<bool>? onChanged, Color? tileColor, Color? activeColor, Color? activeTrackColor, Color? inactiveThumbColor, Color? inactiveTrackColor, ImageProvider<Object>? activeThumbImage, ImageProvider<Object>? inactiveThumbImage, Widget? title, Widget? subtitle, bool isThreeLine = false, bool? dense, EdgeInsetsGeometry? contentPadding, Widget? secondary, bool selected = false, bool autofocus = false, ListTileControlAffinity controlAffinity = ListTileControlAffinity.platform, ShapeBorder? shape, Color? selectedTileColor, VisualDensity? visualDensity, FocusNode? focusNode, bool? enableFeedback, Color? hoverColor}): Creates a Material ListTile with an adaptive Switch, following Material design's Cross-platform guidelines.
const

Properties

activeColor → Color?: The color to use when this switch is on.
final
activeThumbImage → ImageProvider<Object>?: An image to use on the thumb of this switch when the switch is on.
final
activeTrackColor → Color?: The color to use on the track when this switch is on.
final
autofocus → bool: True if this widget will be selected as the initial focus when no other node in its scope is currently focused.
final
contentPadding → EdgeInsetsGeometry?: The tile's internal padding.
final
controlAffinity → ListTileControlAffinity: Defines the position of control and secondary, relative to text.
final
dense → bool?: Whether this list tile is part of a vertically dense list.
final
enableFeedback → bool?: Whether detected gestures should provide acoustic and/or haptic feedback.
final
focusNode → FocusNode?: An optional focus node to use as the focus node for this widget.
final
hashCode → int: The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
hoverColor → Color?: The color for the tile's Material when a pointer is hovering over it.
final
inactiveThumbColor → Color?: The color to use on the thumb when this switch is off.
final
inactiveThumbImage → ImageProvider<Object>?: An image to use on the thumb of this switch when the switch is off.
final
inactiveTrackColor → Color?: The color to use on the track when this switch is off.
final
isThreeLine → bool: Whether this list tile is intended to display three lines of text.
final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
onChanged → ValueChanged<bool>?: Called when the user toggles the switch on or off.
final
runtimeType → Type: A representation of the runtime type of the object.
read-onlyinherited
secondary → Widget?: A widget to display on the opposite side of the tile from the switch.
final
selected → bool: Whether to render icons and text in the activeColor.
final
selectedTileColor → Color?: If non-null, defines the background color when SwitchListTile.selected is true.
final
shape → ShapeBorder?: Defines the tile's InkWell.customBorder and Ink.decoration shape.
final
subtitle → Widget?: Additional content displayed below the title.
final
tileColor → Color?: Defines the background color of ListTile when selected is false.
final
title → Widget?: The primary content of the list tile.
final
value → bool: Whether this switch is checked.
final
visualDensity → VisualDensity?: Defines how compact the list tile's layout will be.
final

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

Flutter
material
SwitchListTile class