packages/flutter/lib/src/material/checkbox_list_tile.dart - mirrors/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'package:flutter/widgets.dart';

 import 'checkbox.dart';
 import 'list_tile.dart';
 import 'theme.dart';
 import 'theme_data.dart';

 // Examples can assume:
 // void setState(VoidCallback fn) { }

 /// A [ListTile] with a [Checkbox]. In other words, a checkbox with a label.
 ///
 /// The entire list tile is interactive: tapping anywhere in the tile toggles
 /// the checkbox.
 ///
 /// The [value], [onChanged], [activeColor] and [checkColor] properties of this widget are
 /// identical to the similarly-named properties on the [Checkbox] 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, but the color used is that described by [activeColor], if any,
 /// defaulting to the accent color of the current [Theme]. No effort is made to
 /// coordinate the [selected] state and the [value] state; to have the list tile
 /// appear selected when the checkbox is checked, pass the same value to both.
 ///
 /// The checkbox is shown on the right by default in left-to-right languages
 /// (i.e. the trailing edge). This can be changed using [controlAffinity]. The
 /// [secondary] widget is placed on the opposite side. This maps to the
 /// [ListTile.leading] and [ListTile.trailing] properties of [ListTile].
 ///
 /// To show the [CheckboxListTile] as disabled, pass null as the [onChanged]
 /// callback.
 ///
 /// {@tool dartpad --template=stateful_widget_scaffold_center}
 ///
 /// ![CheckboxListTile sample](https://flutter.github.io/assets-for-api-docs/assets/material/checkbox_list_tile.png)
 ///
 /// This widget shows a checkbox that, when checked, slows down all animations
 /// (including the animation of the checkbox itself getting checked!).
 ///
 /// This sample requires that you also import 'package:flutter/scheduler.dart',
 /// so that you can reference [timeDilation].
 ///
 /// ```dart imports
 /// import 'package:flutter/scheduler.dart' show timeDilation;
 /// ```
 /// ```dart
 /// @override
 /// Widget build(BuildContext context) {
 ///   return CheckboxListTile(
 ///     title: const Text('Animate Slowly'),
 ///     value: timeDilation != 1.0,
 ///     onChanged: (bool value) {
 ///       setState(() { timeDilation = value ? 10.0 : 1.0; });
 ///     },
 ///     secondary: const Icon(Icons.hourglass_empty),
 ///   );
 /// }
 /// ```
 /// {@end-tool}
 ///
 /// ## Semantics in CheckboxListTile
 ///
 /// Since the entirety of the CheckboxListTile is interactive, it should represent
 /// itself as a single interactive entity.
 ///
 /// To do so, a CheckboxListTile 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, CheckboxListTile 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
 /// CheckboxListTile. [RichText] has an embedded gesture recognizer that
 /// requires its own [Semantics] node, which directly conflicts with
 /// CheckboxListTile'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.
 ///
 /// {@tool sample --template=stateful_widget_scaffold_center}
 ///
 /// ![Checkbox list tile semantics sample](https://flutter.github.io/assets-for-api-docs/assets/material/checkbox_list_tile_semantics.png)
 ///
 /// Here is an example of a custom labeled checkbox widget, called
 /// LinkedLabelCheckbox, that includes an interactive [RichText] widget that
 /// handles tap gestures.
 ///
 /// ```dart imports
 /// import 'package:flutter/gestures.dart';
 /// ```
 /// ```dart preamble
 /// class LinkedLabelCheckbox extends StatelessWidget {
 ///   const LinkedLabelCheckbox({
 ///     this.label,
 ///     this.padding,
 ///     this.value,
 ///     this.onChanged,
 ///   });
 ///
 ///   final String label;
 ///   final EdgeInsets padding;
 ///   final bool value;
 ///   final Function onChanged;
 ///
 ///   @override
 ///   Widget build(BuildContext context) {
 ///     return Padding(
 ///       padding: padding,
 ///       child: Row(
 ///         children: <Widget>[
 ///           Expanded(
 ///             child: RichText(
 ///               text: TextSpan(
 ///                 text: label,
 ///                 style: TextStyle(
 ///                   color: Colors.blueAccent,
 ///                   decoration: TextDecoration.underline,
 ///                 ),
 ///                 recognizer: TapGestureRecognizer()
 ///                   ..onTap = () {
 ///                   print('Label has been tapped.');
 ///                 },
 ///               ),
 ///             ),
 ///           ),
 ///           Checkbox(
 ///             value: value,
 ///             onChanged: (bool newValue) {
 ///               onChanged(newValue);
 ///             },
 ///           ),
 ///         ],
 ///       ),
 ///     );
 ///   }
 /// }
 /// ```
 /// ```dart
 /// bool _isSelected = false;
 ///
 /// @override
 /// Widget build(BuildContext context) {
 ///   return LinkedLabelCheckbox(
 ///     label: 'Linked, tappable label text',
 ///     padding: const EdgeInsets.symmetric(horizontal: 20.0),
 ///     value: _isSelected,
 ///     onChanged: (bool newValue) {
 ///       setState(() {
 ///         _isSelected = newValue;
 ///       });
 ///     },
 ///   );
 /// }
 /// ```
 /// {@end-tool}
 ///
 /// ## CheckboxListTile isn't exactly what I want
 ///
 /// If the way CheckboxListTile pads and positions its elements isn't quite
 /// what you're looking for, you can create custom labeled checkbox widgets by
 /// combining [Checkbox] with other widgets, such as [Text], [Padding] and
 /// [InkWell].
 ///
 /// {@tool dartpad --template=stateful_widget_scaffold_center}
 ///
 /// ![Custom checkbox list tile sample](https://flutter.github.io/assets-for-api-docs/assets/material/checkbox_list_tile_custom.png)
 ///
 /// Here is an example of a custom LabeledCheckbox widget, but you can easily
 /// make your own configurable widget.
 ///
 /// ```dart preamble
 /// class LabeledCheckbox extends StatelessWidget {
 ///   const LabeledCheckbox({
 ///     this.label,
 ///     this.padding,
 ///     this.value,
 ///     this.onChanged,
 ///   });
 ///
 ///   final String label;
 ///   final EdgeInsets padding;
 ///   final bool value;
 ///   final Function onChanged;
 ///
 ///   @override
 ///   Widget build(BuildContext context) {
 ///     return InkWell(
 ///       onTap: () {
 ///         onChanged(!value);
 ///       },
 ///       child: Padding(
 ///         padding: padding,
 ///         child: Row(
 ///           children: <Widget>[
 ///             Expanded(child: Text(label)),
 ///             Checkbox(
 ///               value: value,
 ///               onChanged: (bool newValue) {
 ///                 onChanged(newValue);
 ///               },
 ///             ),
 ///           ],
 ///         ),
 ///       ),
 ///     );
 ///   }
 /// }
 /// ```
 /// ```dart
 /// bool _isSelected = false;
 ///
 /// @override
 /// Widget build(BuildContext context) {
 ///   return LabeledCheckbox(
 ///     label: 'This is the label text',
 ///     padding: const EdgeInsets.symmetric(horizontal: 20.0),
 ///     value: _isSelected,
 ///     onChanged: (bool newValue) {
 ///       setState(() {
 ///         _isSelected = newValue;
 ///       });
 ///     },
 ///   );
 /// }
 /// ```
 /// {@end-tool}
 ///
 /// See also:
 ///
 ///  * [ListTileTheme], which can be used to affect the style of list tiles,
 ///    including checkbox list tiles.
 ///  * [RadioListTile], a similar widget for radio buttons.
 ///  * [SwitchListTile], a similar widget for switches.
 ///  * [ListTile] and [Checkbox], the widgets from which this widget is made.
 class CheckboxListTile extends StatelessWidget {
   /// Creates a combination of a list tile and a checkbox.
   ///
   /// The checkbox tile itself does not maintain any state. Instead, when the
   /// state of the checkbox changes, the widget calls the [onChanged] callback.
   /// Most widgets that use a checkbox will listen for the [onChanged] callback
   /// and rebuild the checkbox tile with a new [value] to update the visual
   /// appearance of the checkbox.
   ///
   /// The following arguments are required:
   ///
   /// * [value], which determines whether the checkbox is checked, and must not
   ///   be null.
   ///
   /// * [onChanged], which is called when the value of the checkbox should
   ///   change. It can be set to null to disable the checkbox.
   const CheckboxListTile({
     Key key,
     @required this.value,
     @required this.onChanged,
     this.activeColor,
     this.checkColor,
     this.title,
     this.subtitle,
     this.isThreeLine = false,
     this.dense,
     this.secondary,
     this.selected = false,
     this.controlAffinity = ListTileControlAffinity.platform,
   }) : assert(value != null),
        assert(isThreeLine != null),
        assert(!isThreeLine || subtitle != null),
        assert(selected != null),
        assert(controlAffinity != null),
        super(key: key);

   /// Whether this checkbox is checked.
   ///
   /// This property must not be null.
   final bool value;

   /// Called when the value of the checkbox should change.
   ///
   /// The checkbox passes the new value to the callback but does not actually
   /// change state until the parent widget rebuilds the checkbox tile with the
   /// new value.
   ///
   /// If null, the checkbox will be displayed as disabled.
   ///
   /// The callback provided to [onChanged] should update the state of the parent
   /// [StatefulWidget] using the [State.setState] method, so that the parent
   /// gets rebuilt; for example:
   ///
   /// ```dart
   /// CheckboxListTile(
   ///   value: _throwShotAway,
   ///   onChanged: (bool newValue) {
   ///     setState(() {
   ///       _throwShotAway = newValue;
   ///     });
   ///   },
   ///   title: Text('Throw away your shot'),
   /// )
   /// ```
   final ValueChanged<bool> onChanged;

   /// The color to use when this checkbox is checked.
   ///
   /// Defaults to accent color of the current [Theme].
   final Color activeColor;

   /// The color to use for the check icon when this checkbox is checked.
   ///
   /// Defaults to Color(0xFFFFFFFF).
   final Color checkColor;

   /// The primary content of the list tile.
   ///
   /// Typically a [Text] widget.
   final Widget title;

   /// Additional content displayed below the title.
   ///
   /// Typically a [Text] widget.
   final Widget subtitle;

   /// A widget to display on the opposite side of the tile from the checkbox.
   ///
   /// Typically an [Icon] widget.
   final Widget secondary;

   /// Whether this list tile is intended to display three lines of text.
   ///
   /// If false, the list tile is treated as having one line if the subtitle is
   /// null and treated as having two lines if the subtitle is non-null.
   final bool isThreeLine;

   /// Whether this list tile is part of a vertically dense list.
   ///
   /// If this property is null then its value is based on [ListTileTheme.dense].
   final bool dense;

   /// Whether to render icons and text in the [activeColor].
   ///
   /// No effort is made to automatically coordinate the [selected] state and the
   /// [value] state. To have the list tile appear selected when the checkbox is
   /// checked, pass the same value to both.
   ///
   /// Normally, this property is left to its default value, false.
   final bool selected;

   /// Where to place the control relative to the text.
   final ListTileControlAffinity controlAffinity;

   @override
   Widget build(BuildContext context) {
     final Widget control = Checkbox(
       value: value,
       onChanged: onChanged,
       activeColor: activeColor,
       checkColor: checkColor,
       materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
     );
     Widget leading, trailing;
     switch (controlAffinity) {
       case ListTileControlAffinity.leading:
         leading = control;
         trailing = secondary;
         break;
       case ListTileControlAffinity.trailing:
       case ListTileControlAffinity.platform:
         leading = secondary;
         trailing = control;
         break;
     }
     return MergeSemantics(
       child: ListTileTheme.merge(
         selectedColor: activeColor ?? Theme.of(context).accentColor,
         child: ListTile(
           leading: leading,
           title: title,
           subtitle: subtitle,
           trailing: trailing,
           isThreeLine: isThreeLine,
           dense: dense,
           enabled: onChanged != null,
           onTap: onChanged != null ? () { onChanged(!value); } : null,
           selected: selected,
         ),
       ),
     );
   }
 }
	// Copyright 2014 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'package:flutter/widgets.dart';

	import 'checkbox.dart';
	import 'list_tile.dart';
	import 'theme.dart';
	import 'theme_data.dart';

	// Examples can assume:
	// void setState(VoidCallback fn) { }

	/// A [ListTile] with a [Checkbox]. In other words, a checkbox with a label.
	///
	/// The entire list tile is interactive: tapping anywhere in the tile toggles
	/// the checkbox.
	///
	/// The [value], [onChanged], [activeColor] and [checkColor] properties of this widget are
	/// identical to the similarly-named properties on the [Checkbox] 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, but the color used is that described by [activeColor], if any,
	/// defaulting to the accent color of the current [Theme]. No effort is made to
	/// coordinate the [selected] state and the [value] state; to have the list tile
	/// appear selected when the checkbox is checked, pass the same value to both.
	///
	/// The checkbox is shown on the right by default in left-to-right languages
	/// (i.e. the trailing edge). This can be changed using [controlAffinity]. The
	/// [secondary] widget is placed on the opposite side. This maps to the
	/// [ListTile.leading] and [ListTile.trailing] properties of [ListTile].
	///
	/// To show the [CheckboxListTile] as disabled, pass null as the [onChanged]
	/// callback.
	///
	/// {@tool dartpad --template=stateful_widget_scaffold_center}
	///
	/// ![CheckboxListTile sample](https://flutter.github.io/assets-for-api-docs/assets/material/checkbox_list_tile.png)
	///
	/// This widget shows a checkbox that, when checked, slows down all animations
	/// (including the animation of the checkbox itself getting checked!).
	///
	/// This sample requires that you also import 'package:flutter/scheduler.dart',
	/// so that you can reference [timeDilation].
	///
	/// ```dart imports
	/// import 'package:flutter/scheduler.dart' show timeDilation;
	/// ```
	/// ```dart
	/// @override
	/// Widget build(BuildContext context) {
	/// return CheckboxListTile(
	/// title: const Text('Animate Slowly'),
	/// value: timeDilation != 1.0,
	/// onChanged: (bool value) {
	/// setState(() { timeDilation = value ? 10.0 : 1.0; });
	/// },
	/// secondary: const Icon(Icons.hourglass_empty),
	/// );
	/// }
	/// ```
	/// {@end-tool}
	///
	/// ## Semantics in CheckboxListTile
	///
	/// Since the entirety of the CheckboxListTile is interactive, it should represent
	/// itself as a single interactive entity.
	///
	/// To do so, a CheckboxListTile 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, CheckboxListTile 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
	/// CheckboxListTile. [RichText] has an embedded gesture recognizer that
	/// requires its own [Semantics] node, which directly conflicts with
	/// CheckboxListTile'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.
	///
	/// {@tool sample --template=stateful_widget_scaffold_center}
	///
	/// ![Checkbox list tile semantics sample](https://flutter.github.io/assets-for-api-docs/assets/material/checkbox_list_tile_semantics.png)
	///
	/// Here is an example of a custom labeled checkbox widget, called
	/// LinkedLabelCheckbox, that includes an interactive [RichText] widget that
	/// handles tap gestures.
	///
	/// ```dart imports
	/// import 'package:flutter/gestures.dart';
	/// ```
	/// ```dart preamble
	/// class LinkedLabelCheckbox extends StatelessWidget {
	/// const LinkedLabelCheckbox({
	/// this.label,
	/// this.padding,
	/// this.value,
	/// this.onChanged,
	/// });
	///
	/// final String label;
	/// final EdgeInsets padding;
	/// final bool value;
	/// final Function onChanged;
	///
	/// @override
	/// Widget build(BuildContext context) {
	/// return Padding(
	/// padding: padding,
	/// child: Row(
	/// children: <Widget>[
	/// Expanded(
	/// child: RichText(
	/// text: TextSpan(
	/// text: label,
	/// style: TextStyle(
	/// color: Colors.blueAccent,
	/// decoration: TextDecoration.underline,
	/// ),
	/// recognizer: TapGestureRecognizer()
	/// ..onTap = () {
	/// print('Label has been tapped.');
	/// },
	/// ),
	/// ),
	/// ),
	/// Checkbox(
	/// value: value,
	/// onChanged: (bool newValue) {
	/// onChanged(newValue);
	/// },
	/// ),
	/// ],
	/// ),
	/// );
	/// }
	/// }
	/// ```
	/// ```dart
	/// bool _isSelected = false;
	///
	/// @override
	/// Widget build(BuildContext context) {
	/// return LinkedLabelCheckbox(
	/// label: 'Linked, tappable label text',
	/// padding: const EdgeInsets.symmetric(horizontal: 20.0),
	/// value: _isSelected,
	/// onChanged: (bool newValue) {
	/// setState(() {
	/// _isSelected = newValue;
	/// });
	/// },
	/// );
	/// }
	/// ```
	/// {@end-tool}
	///
	/// ## CheckboxListTile isn't exactly what I want
	///
	/// If the way CheckboxListTile pads and positions its elements isn't quite
	/// what you're looking for, you can create custom labeled checkbox widgets by
	/// combining [Checkbox] with other widgets, such as [Text], [Padding] and
	/// [InkWell].
	///
	/// {@tool dartpad --template=stateful_widget_scaffold_center}
	///
	/// ![Custom checkbox list tile sample](https://flutter.github.io/assets-for-api-docs/assets/material/checkbox_list_tile_custom.png)
	///
	/// Here is an example of a custom LabeledCheckbox widget, but you can easily
	/// make your own configurable widget.
	///
	/// ```dart preamble
	/// class LabeledCheckbox extends StatelessWidget {
	/// const LabeledCheckbox({
	/// this.label,
	/// this.padding,
	/// this.value,
	/// this.onChanged,
	/// });
	///
	/// final String label;
	/// final EdgeInsets padding;
	/// final bool value;
	/// final Function onChanged;
	///
	/// @override
	/// Widget build(BuildContext context) {
	/// return InkWell(
	/// onTap: () {
	/// onChanged(!value);
	/// },
	/// child: Padding(
	/// padding: padding,
	/// child: Row(
	/// children: <Widget>[
	/// Expanded(child: Text(label)),
	/// Checkbox(
	/// value: value,
	/// onChanged: (bool newValue) {
	/// onChanged(newValue);
	/// },
	/// ),
	/// ],
	/// ),
	/// ),
	/// );
	/// }
	/// }
	/// ```
	/// ```dart
	/// bool _isSelected = false;
	///
	/// @override
	/// Widget build(BuildContext context) {
	/// return LabeledCheckbox(
	/// label: 'This is the label text',
	/// padding: const EdgeInsets.symmetric(horizontal: 20.0),
	/// value: _isSelected,
	/// onChanged: (bool newValue) {
	/// setState(() {
	/// _isSelected = newValue;
	/// });
	/// },
	/// );
	/// }
	/// ```
	/// {@end-tool}
	///
	/// See also:
	///
	/// * [ListTileTheme], which can be used to affect the style of list tiles,
	/// including checkbox list tiles.
	/// * [RadioListTile], a similar widget for radio buttons.
	/// * [SwitchListTile], a similar widget for switches.
	/// * [ListTile] and [Checkbox], the widgets from which this widget is made.
	class CheckboxListTile extends StatelessWidget {
	/// Creates a combination of a list tile and a checkbox.
	///
	/// The checkbox tile itself does not maintain any state. Instead, when the
	/// state of the checkbox changes, the widget calls the [onChanged] callback.
	/// Most widgets that use a checkbox will listen for the [onChanged] callback
	/// and rebuild the checkbox tile with a new [value] to update the visual
	/// appearance of the checkbox.
	///
	/// The following arguments are required:
	///
	/// * [value], which determines whether the checkbox is checked, and must not
	/// be null.
	///
	/// * [onChanged], which is called when the value of the checkbox should
	/// change. It can be set to null to disable the checkbox.
	const CheckboxListTile({
	Key key,
	@required this.value,
	@required this.onChanged,
	this.activeColor,
	this.checkColor,
	this.title,
	this.subtitle,
	this.isThreeLine = false,
	this.dense,
	this.secondary,
	this.selected = false,
	this.controlAffinity = ListTileControlAffinity.platform,
	}) : assert(value != null),
	assert(isThreeLine != null),
	assert(!isThreeLine \|\| subtitle != null),
	assert(selected != null),
	assert(controlAffinity != null),
	super(key: key);

	/// Whether this checkbox is checked.
	///
	/// This property must not be null.
	final bool value;

	/// Called when the value of the checkbox should change.
	///
	/// The checkbox passes the new value to the callback but does not actually
	/// change state until the parent widget rebuilds the checkbox tile with the
	/// new value.
	///
	/// If null, the checkbox will be displayed as disabled.
	///
	/// The callback provided to [onChanged] should update the state of the parent
	/// [StatefulWidget] using the [State.setState] method, so that the parent
	/// gets rebuilt; for example:
	///
	/// ```dart
	/// CheckboxListTile(
	/// value: _throwShotAway,
	/// onChanged: (bool newValue) {
	/// setState(() {
	/// _throwShotAway = newValue;
	/// });
	/// },
	/// title: Text('Throw away your shot'),
	/// )
	/// ```
	final ValueChanged<bool> onChanged;

	/// The color to use when this checkbox is checked.
	///
	/// Defaults to accent color of the current [Theme].
	final Color activeColor;

	/// The color to use for the check icon when this checkbox is checked.
	///
	/// Defaults to Color(0xFFFFFFFF).
	final Color checkColor;

	/// The primary content of the list tile.
	///
	/// Typically a [Text] widget.
	final Widget title;

	/// Additional content displayed below the title.
	///
	/// Typically a [Text] widget.
	final Widget subtitle;

	/// A widget to display on the opposite side of the tile from the checkbox.
	///
	/// Typically an [Icon] widget.
	final Widget secondary;

	/// Whether this list tile is intended to display three lines of text.
	///
	/// If false, the list tile is treated as having one line if the subtitle is
	/// null and treated as having two lines if the subtitle is non-null.
	final bool isThreeLine;

	/// Whether this list tile is part of a vertically dense list.
	///
	/// If this property is null then its value is based on [ListTileTheme.dense].
	final bool dense;

	/// Whether to render icons and text in the [activeColor].
	///
	/// No effort is made to automatically coordinate the [selected] state and the
	/// [value] state. To have the list tile appear selected when the checkbox is
	/// checked, pass the same value to both.
	///
	/// Normally, this property is left to its default value, false.
	final bool selected;

	/// Where to place the control relative to the text.
	final ListTileControlAffinity controlAffinity;

	@override
	Widget build(BuildContext context) {
	final Widget control = Checkbox(
	value: value,
	onChanged: onChanged,
	activeColor: activeColor,
	checkColor: checkColor,
	materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
	);
	Widget leading, trailing;
	switch (controlAffinity) {
	case ListTileControlAffinity.leading:
	leading = control;
	trailing = secondary;
	break;
	case ListTileControlAffinity.trailing:
	case ListTileControlAffinity.platform:
	leading = secondary;
	trailing = control;
	break;
	}
	return MergeSemantics(
	child: ListTileTheme.merge(
	selectedColor: activeColor ?? Theme.of(context).accentColor,
	child: ListTile(
	leading: leading,
	title: title,
	subtitle: subtitle,
	trailing: trailing,
	isThreeLine: isThreeLine,
	dense: dense,
	enabled: onChanged != null,
	onTap: onChanged != null ? () { onChanged(!value); } : null,
	selected: selected,
	),
	),
	);
	}
	}