packages/flutter/lib/src/cupertino/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 'dart:async';

 import 'package:flutter/widgets.dart';

 import 'colors.dart';
 import 'icons.dart';
 import 'theme.dart';

 // These constants were eyeballed from iOS 14.4 Settings app for base, Notes for
 // notched without leading, and Reminders app for notched with leading.
 const double _kLeadingSize = 28.0;
 const double _kNotchedLeadingSize = 30.0;
 const double _kMinHeight = _kLeadingSize + 2 * 8.0;
 const double _kMinHeightWithSubtitle = _kLeadingSize + 2 * 10.0;
 const double _kNotchedMinHeight = _kNotchedLeadingSize + 2 * 12.0;
 const double _kNotchedMinHeightWithoutLeading = _kNotchedLeadingSize + 2 * 10.0;
 const EdgeInsetsDirectional _kPadding = EdgeInsetsDirectional.only(start: 20.0, end: 14.0);
 const EdgeInsetsDirectional _kPaddingWithSubtitle = EdgeInsetsDirectional.only(start: 20.0, end: 14.0);
 const EdgeInsets _kNotchedPadding = EdgeInsets.symmetric(horizontal: 14.0);
 const EdgeInsetsDirectional _kNotchedPaddingWithoutLeading = EdgeInsetsDirectional.fromSTEB(28.0, 10.0, 14.0, 10.0);
 const double _kLeadingToTitle = 16.0;
 const double _kNotchedLeadingToTitle = 12.0;
 const double _kNotchedTitleToSubtitle = 3.0;
 const double _kAdditionalInfoToTrailing = 6.0;
 const double _kNotchedTitleWithSubtitleFontSize = 16.0;
 const double _kSubtitleFontSize = 12.0;
 const double _kNotchedSubtitleFontSize = 14.0;

 enum _CupertinoListTileType { base, notched }

 /// An iOS-style list tile.
 ///
 /// The [CupertinoListTile] is a Cupertino equivalent of Material [ListTile].
 /// It comes in two forms, an old-fashioned edge-to-edge variant known from iOS
 /// Settings app and in a new, "Inset Grouped" form, known from either iOS Notes
 /// or Reminders app. The first is constructed using default constructor, and
 /// the latter using named constructor [CupertinoListTile.notched].
 ///
 /// The [title], [subtitle], and [additionalInfo] are usually [Text] widgets.
 /// They are all limited to one line so it is a responsibility of the caller to
 /// take care of text wrapping.
 ///
 /// The size of [leading] is by default constrained to match the iOS size,
 /// depending of the type of list tile. This can however be overridden by
 /// providing [leadingSize]. The [trailing] widget is not constrained and is
 /// therefore a responsibility of the caller to ensure reasonable size of the
 /// [trailing] widget.
 ///
 /// The background color of the tile can be set with [backgroundColor] for the
 /// state before tile was tapped and with [backgroundColorActivated] for the
 /// state after the tile was tapped. By default, both values are set to match
 /// the default iOS appearance.
 ///
 /// The [padding] and [leadingToTitle] are by default set to match iOS but can
 /// be overwritten if necessary.
 ///
 /// The [onTap] callback provides an option to react to taps anywhere inside the
 /// list tile. This can be used to navigate routes and according to iOS
 /// behavior it should not be used for example to toggle the [CupertinoSwitch]
 /// in the trailing widget.
 ///
 /// See also:
 ///
 ///  * [CupertinoListSection], an iOS-style list that is a typical container for
 ///    [CupertinoListTile].
 ///  * [ListTile], a Material Design list tile.
 class CupertinoListTile extends StatefulWidget {
   /// Creates an edge-to-edge iOS-style list tile like the tiles in iOS Settings
   /// app.
   ///
   /// The [title] parameter is required. It is used to convey the most important
   /// information of list tile. It is typically a [Text].
   ///
   /// The [subtitle] parameter is used to display additional information. It is
   /// placed below the [title].
   ///
   /// The [additionalInfo] parameter is used to display additional information.
   /// It is placed at the end of the tile, before the [trailing] if supplied.
   ///
   /// The [leading] parameter is typically an [Icon] or an [Image] and it comes
   /// at the start of the tile. If omitted in all list tiles, a `hasLeading` of
   /// enclosing [CupertinoListSection] should be set to `false` to ensure
   /// correct margin of divider between tiles.
   ///
   /// The [trailing] parameter is typically a [CupertinoListTileChevron], an
   /// [Icon], or a [CupertinoButton]. It is placed at the very end of the tile.
   ///
   /// The [onTap] parameter is used to provide an action that is called when the
   /// tile is tapped. It is mainly used for navigating to a new route. It should
   /// not be used to toggle a trailing [CupertinoSwitch] and similar use cases
   /// because when tile is tapped, it switches the background color and remains
   /// changed. This is according to iOS behavior.
   ///
   /// The [backgroundColor] provides a custom background color for the tile in
   /// a state before tapped. By default, it matches the theme's background color
   /// which is by default a [CupertinoColors.systemBackground].
   ///
   /// The [backgroundColorActivated] provides a custom background color for the
   /// tile after it was tapped. By default, it matches the theme's background
   /// color which is by default a [CupertinoColors.systemGrey4].
   ///
   /// The [padding] parameter sets the padding of the content inside the tile.
   /// It defaults to a value that matches the iOS look, depending on a type of
   /// [CupertinoListTile]. For native look, it should not be provided.
   ///
   /// The [leadingSize] constrains the width and height of the leading widget.
   /// By default, it is set to a value that matches the iOS look, depending on a
   /// type of [CupertinoListTile]. For native look, it should not be provided.
   ///
   /// The [leadingToTitle] specifies the horizontal space between [leading] and
   /// [title] widgets. By default, it is set to a value that matched the iOS
   /// look, depending on a type of [CupertinoListTile]. For native look, it
   /// should not be provided.
   const CupertinoListTile({
     super.key,
     required this.title,
     this.subtitle,
     this.additionalInfo,
     this.leading,
     this.trailing,
     this.onTap,
     this.backgroundColor,
     this.backgroundColorActivated,
     this.padding,
     this.leadingSize = _kLeadingSize,
     this.leadingToTitle = _kLeadingToTitle,
   }) : _type = _CupertinoListTileType.base;

   /// Creates a notched iOS-style list tile like the tiles in iOS Notes app or
   /// Reminders app.
   ///
   /// The [title] parameter is required. It is used to convey the most important
   /// information of list tile. It is typically a [Text].
   ///
   /// The [subtitle] parameter is used to display additional information. It is
   /// placed below the [title].
   ///
   /// The [additionalInfo] parameter is used to display additional information.
   /// It is placed at the end of the tile, before the [trailing] if supplied.
   ///
   /// The [leading] parameter is typically an [Icon] or an [Image] and it comes
   /// at the start of the tile. If omitted in all list tiles, a `hasLeading` of
   /// enclosing [CupertinoListSection] should be set to `false` to ensure
   /// correct margin of divider between tiles. For Notes-like tile appearance,
   /// the [leading] can be left `null`.
   ///
   /// The [trailing] parameter is typically a [CupertinoListTileChevron], an
   /// [Icon], or a [CupertinoButton]. It is placed at the very end of the tile.
   /// For Notes-like tile appearance, the [trailing] can be left `null`.
   ///
   /// The [onTap] parameter is used to provide an action that is called when the
   /// tile is tapped. It is mainly used for navigating to a new route. It should
   /// not be used to toggle a trailing [CupertinoSwitch] and similar use cases
   /// because when tile is tapped, it switches the background color and remains
   /// changed. This is according to iOS behavior.
   ///
   /// The [backgroundColor] provides a custom background color for the tile in
   /// a state before tapped. By default, it matches the theme's background color
   /// which is by default a [CupertinoColors.systemBackground].
   ///
   /// The [backgroundColorActivated] provides a custom background color for the
   /// tile after it was tapped. By default, it matches the theme's background
   /// color which is by default a [CupertinoColors.systemGrey4].
   ///
   /// The [padding] parameter sets the padding of the content inside the tile.
   /// It defaults to a value that matches the iOS look, depending on a type of
   /// [CupertinoListTile]. For native look, it should not be provided.
   ///
   /// The [leadingSize] constrains the width and height of the leading widget.
   /// By default, it is set to a value that matches the iOS look, depending on a
   /// type of [CupertinoListTile]. For native look, it should not be provided.
   ///
   /// The [leadingToTitle] specifies the horizontal space between [leading] and
   /// [title] widgets. By default, it is set to a value that matched the iOS
   /// look, depending on a type of [CupertinoListTile]. For native look, it
   /// should not be provided.
   const CupertinoListTile.notched({
     super.key,
     required this.title,
     this.subtitle,
     this.additionalInfo,
     this.leading,
     this.trailing,
     this.onTap,
     this.backgroundColor,
     this.backgroundColorActivated,
     this.padding,
     this.leadingSize = _kNotchedLeadingSize,
     this.leadingToTitle = _kNotchedLeadingToTitle,
   }) : _type = _CupertinoListTileType.notched;

   final _CupertinoListTileType _type;

   /// A [title] is used to convey the central information. Usually a [Text].
   final Widget title;

   /// A [subtitle] is used to display additional information. It is located
   /// below [title]. Usually a [Text] widget.
   final Widget? subtitle;

   /// Similar to [subtitle], an [additionalInfo] is used to display additional
   /// information. However, instead of being displayed below [title], it is
   /// displayed on the right, before [trailing]. Usually a [Text] widget.
   final Widget? additionalInfo;

   /// A widget displayed at the start of the [CupertinoListTile]. This is
   /// typically an `Icon` or an `Image`.
   final Widget? leading;

   /// A widget displayed at the end of the [CupertinoListTile]. This is usually
   /// a right chevron icon (e.g. `CupertinoListTileChevron`), or an `Icon`.
   final Widget? trailing;

   /// The [onTap] function is called when a user taps on [CupertinoListTile]. If
   /// left `null`, the [CupertinoListTile] will not react on taps. If this is a
   /// `Future<void> Function()`, then the [CupertinoListTile] remains activated
   /// until the returned future is awaited. This is according to iOS behavior.
   /// However, if this function is a `void Function()`, then the tile is active
   /// only for the duration of invocation.
   final FutureOr<void> Function()? onTap;

   /// The [backgroundColor] of the tile in normal state. Once the tile is
   /// tapped, the background color switches to [backgroundColorActivated]. It is
   /// set to match the iOS look by default.
   final Color? backgroundColor;

   /// The [backgroundColorActivated] is the background color of the tile after
   /// the tile was tapped. It is set to match the iOS look by default.
   final Color? backgroundColorActivated;

   /// Padding of the content inside [CupertinoListTile].
   final EdgeInsetsGeometry? padding;

   /// The [leadingSize] is used to constrain the width and height of [leading]
   /// widget.
   final double leadingSize;

   /// The horizontal space between [leading] widget and [title].
   final double leadingToTitle;

   @override
   State<CupertinoListTile> createState() => _CupertinoListTileState();
 }

 class _CupertinoListTileState extends State<CupertinoListTile> {
   bool _tapped = false;

   @override
   Widget build(BuildContext context) {
     final TextStyle titleTextStyle =
         widget._type == _CupertinoListTileType.base || widget.subtitle == null
             ? CupertinoTheme.of(context).textTheme.textStyle
             : CupertinoTheme.of(context).textTheme.textStyle.merge(
                   TextStyle(
                     fontWeight: FontWeight.w600,
                     fontSize: widget.leading == null ? _kNotchedTitleWithSubtitleFontSize : null,
                   ),
                 );

     final TextStyle subtitleTextStyle = widget._type == _CupertinoListTileType.base
         ? CupertinoTheme.of(context).textTheme.textStyle.merge(
               TextStyle(
                 fontSize: _kSubtitleFontSize,
                 color: CupertinoColors.secondaryLabel.resolveFrom(context),
               ),
             )
         : CupertinoTheme.of(context).textTheme.textStyle.merge(
               TextStyle(
                 fontSize: _kNotchedSubtitleFontSize,
                 color: CupertinoColors.secondaryLabel.resolveFrom(context),
               ),
             );

     final TextStyle? additionalInfoTextStyle = widget.additionalInfo != null
         ? CupertinoTheme.of(context).textTheme.textStyle.merge(
             TextStyle(color: CupertinoColors.secondaryLabel.resolveFrom(context)))
         : null;

     final Widget title = DefaultTextStyle(
       style: titleTextStyle,
       maxLines: 1,
       child: widget.title,
     );

     EdgeInsetsGeometry? padding = widget.padding;
     if (padding == null) {
       switch (widget._type) {
         case _CupertinoListTileType.base:
           padding = widget.subtitle == null ? _kPadding : _kPaddingWithSubtitle;
           break;
         case _CupertinoListTileType.notched:
           padding = widget.leading == null ? _kNotchedPaddingWithoutLeading : _kNotchedPadding;
           break;
       }
     }

     Widget? subtitle;
     if (widget.subtitle != null) {
       subtitle = DefaultTextStyle(
         style: subtitleTextStyle,
         maxLines: 1,
         child: widget.subtitle!,
       );
     }

     Widget? additionalInfo;
     if (widget.additionalInfo != null) {
       additionalInfo = DefaultTextStyle(
         style: additionalInfoTextStyle!,
         maxLines: 1,
         child: widget.additionalInfo!,
       );
     }

     // The color for default state tile is set to either what user provided or
     // null and it will resolve to the correct color provided by context. But if
     // the tile was tapped, it is set to what user provided or if null to the
     // default color that matched the iOS-style.
     Color? backgroundColor = widget.backgroundColor;
     if (_tapped) {
       backgroundColor = widget.backgroundColorActivated ?? CupertinoColors.systemGrey4.resolveFrom(context);
     }

     double minHeight;
     switch (widget._type) {
       case _CupertinoListTileType.base:
         minHeight = subtitle == null ? _kMinHeight : _kMinHeightWithSubtitle;
         break;
       case _CupertinoListTileType.notched:
         minHeight = widget.leading == null ? _kNotchedMinHeightWithoutLeading : _kNotchedMinHeight;
         break;
     }

     final Widget child = Container(
       constraints: BoxConstraints(minWidth: double.infinity, minHeight: minHeight),
       color: backgroundColor,
       child: Padding(
         padding: padding,
         child: Row(
           children: <Widget>[
             if (widget.leading != null) ...<Widget>[
               SizedBox(
                 width: widget.leadingSize,
                 height: widget.leadingSize,
                 child: Center(
                   child: widget.leading,
                 ),
               ),
               SizedBox(width: widget.leadingToTitle),
             ] else
               SizedBox(height: widget.leadingSize),
             Column(
               mainAxisAlignment: MainAxisAlignment.spaceBetween,
               crossAxisAlignment: CrossAxisAlignment.start,
               children: <Widget>[
                 title,
                 if (subtitle != null) ...<Widget>[
                   const SizedBox(height: _kNotchedTitleToSubtitle),
                   subtitle,
                 ],
               ],
             ),
             const Spacer(),
             if (additionalInfo != null) ...<Widget>[
               additionalInfo,
               if (widget.trailing != null)
                 const SizedBox(width: _kAdditionalInfoToTrailing),
             ],
             if (widget.trailing != null) widget.trailing!
           ],
         ),
       ),
     );

     if (widget.onTap == null) {
       return child;
     }

     return GestureDetector(
       onTapDown: (_) => setState(() { _tapped = true; }),
       onTapCancel: () => setState(() { _tapped = false; }),
       onTap: () async {
         await widget.onTap!();
         if (mounted) {
           setState(() { _tapped = false; });
         }
       },
       behavior: HitTestBehavior.opaque,
       child: child,
     );
   }
 }

 /// A typical iOS trailing widget used to denote that a `CupertinoListTile` is a
 /// button with an action.
 ///
 /// The [CupertinoListTileChevron] is meant as a convenience implementation of
 /// trailing right chevron.
 class CupertinoListTileChevron extends StatelessWidget {
   /// Creates a typical widget used to denote that a `CupertinoListTile` is a
   /// button with action.
   const CupertinoListTileChevron({super.key});

   @override
   Widget build(BuildContext context) {
     return Icon(
       CupertinoIcons.right_chevron,
       size: CupertinoTheme.of(context).textTheme.textStyle.fontSize,
       color: CupertinoColors.systemGrey2.resolveFrom(context),
     );
   }
 }
	// 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 'dart:async';

	import 'package:flutter/widgets.dart';

	import 'colors.dart';
	import 'icons.dart';
	import 'theme.dart';

	// These constants were eyeballed from iOS 14.4 Settings app for base, Notes for
	// notched without leading, and Reminders app for notched with leading.
	const double _kLeadingSize = 28.0;
	const double _kNotchedLeadingSize = 30.0;
	const double _kMinHeight = _kLeadingSize + 2 * 8.0;
	const double _kMinHeightWithSubtitle = _kLeadingSize + 2 * 10.0;
	const double _kNotchedMinHeight = _kNotchedLeadingSize + 2 * 12.0;
	const double _kNotchedMinHeightWithoutLeading = _kNotchedLeadingSize + 2 * 10.0;
	const EdgeInsetsDirectional _kPadding = EdgeInsetsDirectional.only(start: 20.0, end: 14.0);
	const EdgeInsetsDirectional _kPaddingWithSubtitle = EdgeInsetsDirectional.only(start: 20.0, end: 14.0);
	const EdgeInsets _kNotchedPadding = EdgeInsets.symmetric(horizontal: 14.0);
	const EdgeInsetsDirectional _kNotchedPaddingWithoutLeading = EdgeInsetsDirectional.fromSTEB(28.0, 10.0, 14.0, 10.0);
	const double _kLeadingToTitle = 16.0;
	const double _kNotchedLeadingToTitle = 12.0;
	const double _kNotchedTitleToSubtitle = 3.0;
	const double _kAdditionalInfoToTrailing = 6.0;
	const double _kNotchedTitleWithSubtitleFontSize = 16.0;
	const double _kSubtitleFontSize = 12.0;
	const double _kNotchedSubtitleFontSize = 14.0;

	enum _CupertinoListTileType { base, notched }

	/// An iOS-style list tile.
	///
	/// The [CupertinoListTile] is a Cupertino equivalent of Material [ListTile].
	/// It comes in two forms, an old-fashioned edge-to-edge variant known from iOS
	/// Settings app and in a new, "Inset Grouped" form, known from either iOS Notes
	/// or Reminders app. The first is constructed using default constructor, and
	/// the latter using named constructor [CupertinoListTile.notched].
	///
	/// The [title], [subtitle], and [additionalInfo] are usually [Text] widgets.
	/// They are all limited to one line so it is a responsibility of the caller to
	/// take care of text wrapping.
	///
	/// The size of [leading] is by default constrained to match the iOS size,
	/// depending of the type of list tile. This can however be overridden by
	/// providing [leadingSize]. The [trailing] widget is not constrained and is
	/// therefore a responsibility of the caller to ensure reasonable size of the
	/// [trailing] widget.
	///
	/// The background color of the tile can be set with [backgroundColor] for the
	/// state before tile was tapped and with [backgroundColorActivated] for the
	/// state after the tile was tapped. By default, both values are set to match
	/// the default iOS appearance.
	///
	/// The [padding] and [leadingToTitle] are by default set to match iOS but can
	/// be overwritten if necessary.
	///
	/// The [onTap] callback provides an option to react to taps anywhere inside the
	/// list tile. This can be used to navigate routes and according to iOS
	/// behavior it should not be used for example to toggle the [CupertinoSwitch]
	/// in the trailing widget.
	///
	/// See also:
	///
	/// * [CupertinoListSection], an iOS-style list that is a typical container for
	/// [CupertinoListTile].
	/// * [ListTile], a Material Design list tile.
	class CupertinoListTile extends StatefulWidget {
	/// Creates an edge-to-edge iOS-style list tile like the tiles in iOS Settings
	/// app.
	///
	/// The [title] parameter is required. It is used to convey the most important
	/// information of list tile. It is typically a [Text].
	///
	/// The [subtitle] parameter is used to display additional information. It is
	/// placed below the [title].
	///
	/// The [additionalInfo] parameter is used to display additional information.
	/// It is placed at the end of the tile, before the [trailing] if supplied.
	///
	/// The [leading] parameter is typically an [Icon] or an [Image] and it comes
	/// at the start of the tile. If omitted in all list tiles, a `hasLeading` of
	/// enclosing [CupertinoListSection] should be set to `false` to ensure
	/// correct margin of divider between tiles.
	///
	/// The [trailing] parameter is typically a [CupertinoListTileChevron], an
	/// [Icon], or a [CupertinoButton]. It is placed at the very end of the tile.
	///
	/// The [onTap] parameter is used to provide an action that is called when the
	/// tile is tapped. It is mainly used for navigating to a new route. It should
	/// not be used to toggle a trailing [CupertinoSwitch] and similar use cases
	/// because when tile is tapped, it switches the background color and remains
	/// changed. This is according to iOS behavior.
	///
	/// The [backgroundColor] provides a custom background color for the tile in
	/// a state before tapped. By default, it matches the theme's background color
	/// which is by default a [CupertinoColors.systemBackground].
	///
	/// The [backgroundColorActivated] provides a custom background color for the
	/// tile after it was tapped. By default, it matches the theme's background
	/// color which is by default a [CupertinoColors.systemGrey4].
	///
	/// The [padding] parameter sets the padding of the content inside the tile.
	/// It defaults to a value that matches the iOS look, depending on a type of
	/// [CupertinoListTile]. For native look, it should not be provided.
	///
	/// The [leadingSize] constrains the width and height of the leading widget.
	/// By default, it is set to a value that matches the iOS look, depending on a
	/// type of [CupertinoListTile]. For native look, it should not be provided.
	///
	/// The [leadingToTitle] specifies the horizontal space between [leading] and
	/// [title] widgets. By default, it is set to a value that matched the iOS
	/// look, depending on a type of [CupertinoListTile]. For native look, it
	/// should not be provided.
	const CupertinoListTile({
	super.key,
	required this.title,
	this.subtitle,
	this.additionalInfo,
	this.leading,
	this.trailing,
	this.onTap,
	this.backgroundColor,
	this.backgroundColorActivated,
	this.padding,
	this.leadingSize = _kLeadingSize,
	this.leadingToTitle = _kLeadingToTitle,
	}) : _type = _CupertinoListTileType.base;

	/// Creates a notched iOS-style list tile like the tiles in iOS Notes app or
	/// Reminders app.
	///
	/// The [title] parameter is required. It is used to convey the most important
	/// information of list tile. It is typically a [Text].
	///
	/// The [subtitle] parameter is used to display additional information. It is
	/// placed below the [title].
	///
	/// The [additionalInfo] parameter is used to display additional information.
	/// It is placed at the end of the tile, before the [trailing] if supplied.
	///
	/// The [leading] parameter is typically an [Icon] or an [Image] and it comes
	/// at the start of the tile. If omitted in all list tiles, a `hasLeading` of
	/// enclosing [CupertinoListSection] should be set to `false` to ensure
	/// correct margin of divider between tiles. For Notes-like tile appearance,
	/// the [leading] can be left `null`.
	///
	/// The [trailing] parameter is typically a [CupertinoListTileChevron], an
	/// [Icon], or a [CupertinoButton]. It is placed at the very end of the tile.
	/// For Notes-like tile appearance, the [trailing] can be left `null`.
	///
	/// The [onTap] parameter is used to provide an action that is called when the
	/// tile is tapped. It is mainly used for navigating to a new route. It should
	/// not be used to toggle a trailing [CupertinoSwitch] and similar use cases
	/// because when tile is tapped, it switches the background color and remains
	/// changed. This is according to iOS behavior.
	///
	/// The [backgroundColor] provides a custom background color for the tile in
	/// a state before tapped. By default, it matches the theme's background color
	/// which is by default a [CupertinoColors.systemBackground].
	///
	/// The [backgroundColorActivated] provides a custom background color for the
	/// tile after it was tapped. By default, it matches the theme's background
	/// color which is by default a [CupertinoColors.systemGrey4].
	///
	/// The [padding] parameter sets the padding of the content inside the tile.
	/// It defaults to a value that matches the iOS look, depending on a type of
	/// [CupertinoListTile]. For native look, it should not be provided.
	///
	/// The [leadingSize] constrains the width and height of the leading widget.
	/// By default, it is set to a value that matches the iOS look, depending on a
	/// type of [CupertinoListTile]. For native look, it should not be provided.
	///
	/// The [leadingToTitle] specifies the horizontal space between [leading] and
	/// [title] widgets. By default, it is set to a value that matched the iOS
	/// look, depending on a type of [CupertinoListTile]. For native look, it
	/// should not be provided.
	const CupertinoListTile.notched({
	super.key,
	required this.title,
	this.subtitle,
	this.additionalInfo,
	this.leading,
	this.trailing,
	this.onTap,
	this.backgroundColor,
	this.backgroundColorActivated,
	this.padding,
	this.leadingSize = _kNotchedLeadingSize,
	this.leadingToTitle = _kNotchedLeadingToTitle,
	}) : _type = _CupertinoListTileType.notched;

	final _CupertinoListTileType _type;

	/// A [title] is used to convey the central information. Usually a [Text].
	final Widget title;

	/// A [subtitle] is used to display additional information. It is located
	/// below [title]. Usually a [Text] widget.
	final Widget? subtitle;

	/// Similar to [subtitle], an [additionalInfo] is used to display additional
	/// information. However, instead of being displayed below [title], it is
	/// displayed on the right, before [trailing]. Usually a [Text] widget.
	final Widget? additionalInfo;

	/// A widget displayed at the start of the [CupertinoListTile]. This is
	/// typically an `Icon` or an `Image`.
	final Widget? leading;

	/// A widget displayed at the end of the [CupertinoListTile]. This is usually
	/// a right chevron icon (e.g. `CupertinoListTileChevron`), or an `Icon`.
	final Widget? trailing;

	/// The [onTap] function is called when a user taps on [CupertinoListTile]. If
	/// left `null`, the [CupertinoListTile] will not react on taps. If this is a
	/// `Future<void> Function()`, then the [CupertinoListTile] remains activated
	/// until the returned future is awaited. This is according to iOS behavior.
	/// However, if this function is a `void Function()`, then the tile is active
	/// only for the duration of invocation.
	final FutureOr<void> Function()? onTap;

	/// The [backgroundColor] of the tile in normal state. Once the tile is
	/// tapped, the background color switches to [backgroundColorActivated]. It is
	/// set to match the iOS look by default.
	final Color? backgroundColor;

	/// The [backgroundColorActivated] is the background color of the tile after
	/// the tile was tapped. It is set to match the iOS look by default.
	final Color? backgroundColorActivated;

	/// Padding of the content inside [CupertinoListTile].
	final EdgeInsetsGeometry? padding;

	/// The [leadingSize] is used to constrain the width and height of [leading]
	/// widget.
	final double leadingSize;

	/// The horizontal space between [leading] widget and [title].
	final double leadingToTitle;

	@override
	State<CupertinoListTile> createState() => _CupertinoListTileState();
	}

	class _CupertinoListTileState extends State<CupertinoListTile> {
	bool _tapped = false;

	@override
	Widget build(BuildContext context) {
	final TextStyle titleTextStyle =
	widget._type == _CupertinoListTileType.base \|\| widget.subtitle == null
	? CupertinoTheme.of(context).textTheme.textStyle
	: CupertinoTheme.of(context).textTheme.textStyle.merge(
	TextStyle(
	fontWeight: FontWeight.w600,
	fontSize: widget.leading == null ? _kNotchedTitleWithSubtitleFontSize : null,
	),
	);

	final TextStyle subtitleTextStyle = widget._type == _CupertinoListTileType.base
	? CupertinoTheme.of(context).textTheme.textStyle.merge(
	TextStyle(
	fontSize: _kSubtitleFontSize,
	color: CupertinoColors.secondaryLabel.resolveFrom(context),
	),
	)
	: CupertinoTheme.of(context).textTheme.textStyle.merge(
	TextStyle(
	fontSize: _kNotchedSubtitleFontSize,
	color: CupertinoColors.secondaryLabel.resolveFrom(context),
	),
	);

	final TextStyle? additionalInfoTextStyle = widget.additionalInfo != null
	? CupertinoTheme.of(context).textTheme.textStyle.merge(
	TextStyle(color: CupertinoColors.secondaryLabel.resolveFrom(context)))
	: null;

	final Widget title = DefaultTextStyle(
	style: titleTextStyle,
	maxLines: 1,
	child: widget.title,
	);

	EdgeInsetsGeometry? padding = widget.padding;
	if (padding == null) {
	switch (widget._type) {
	case _CupertinoListTileType.base:
	padding = widget.subtitle == null ? _kPadding : _kPaddingWithSubtitle;
	break;
	case _CupertinoListTileType.notched:
	padding = widget.leading == null ? _kNotchedPaddingWithoutLeading : _kNotchedPadding;
	break;
	}
	}

	Widget? subtitle;
	if (widget.subtitle != null) {
	subtitle = DefaultTextStyle(
	style: subtitleTextStyle,
	maxLines: 1,
	child: widget.subtitle!,
	);
	}

	Widget? additionalInfo;
	if (widget.additionalInfo != null) {
	additionalInfo = DefaultTextStyle(
	style: additionalInfoTextStyle!,
	maxLines: 1,
	child: widget.additionalInfo!,
	);
	}

	// The color for default state tile is set to either what user provided or
	// null and it will resolve to the correct color provided by context. But if
	// the tile was tapped, it is set to what user provided or if null to the
	// default color that matched the iOS-style.
	Color? backgroundColor = widget.backgroundColor;
	if (_tapped) {
	backgroundColor = widget.backgroundColorActivated ?? CupertinoColors.systemGrey4.resolveFrom(context);
	}

	double minHeight;
	switch (widget._type) {
	case _CupertinoListTileType.base:
	minHeight = subtitle == null ? _kMinHeight : _kMinHeightWithSubtitle;
	break;
	case _CupertinoListTileType.notched:
	minHeight = widget.leading == null ? _kNotchedMinHeightWithoutLeading : _kNotchedMinHeight;
	break;
	}

	final Widget child = Container(
	constraints: BoxConstraints(minWidth: double.infinity, minHeight: minHeight),
	color: backgroundColor,
	child: Padding(
	padding: padding,
	child: Row(
	children: <Widget>[
	if (widget.leading != null) ...<Widget>[
	SizedBox(
	width: widget.leadingSize,
	height: widget.leadingSize,
	child: Center(
	child: widget.leading,
	),
	),
	SizedBox(width: widget.leadingToTitle),
	] else
	SizedBox(height: widget.leadingSize),
	Column(
	mainAxisAlignment: MainAxisAlignment.spaceBetween,
	crossAxisAlignment: CrossAxisAlignment.start,
	children: <Widget>[
	title,
	if (subtitle != null) ...<Widget>[
	const SizedBox(height: _kNotchedTitleToSubtitle),
	subtitle,
	],
	],
	),
	const Spacer(),
	if (additionalInfo != null) ...<Widget>[
	additionalInfo,
	if (widget.trailing != null)
	const SizedBox(width: _kAdditionalInfoToTrailing),
	],
	if (widget.trailing != null) widget.trailing!
	],
	),
	),
	);

	if (widget.onTap == null) {
	return child;
	}

	return GestureDetector(
	onTapDown: (_) => setState(() { _tapped = true; }),
	onTapCancel: () => setState(() { _tapped = false; }),
	onTap: () async {
	await widget.onTap!();
	if (mounted) {
	setState(() { _tapped = false; });
	}
	},
	behavior: HitTestBehavior.opaque,
	child: child,
	);
	}
	}

	/// A typical iOS trailing widget used to denote that a `CupertinoListTile` is a
	/// button with an action.
	///
	/// The [CupertinoListTileChevron] is meant as a convenience implementation of
	/// trailing right chevron.
	class CupertinoListTileChevron extends StatelessWidget {
	/// Creates a typical widget used to denote that a `CupertinoListTile` is a
	/// button with action.
	const CupertinoListTileChevron({super.key});

	@override
	Widget build(BuildContext context) {
	return Icon(
	CupertinoIcons.right_chevron,
	size: CupertinoTheme.of(context).textTheme.textStyle.fontSize,
	color: CupertinoColors.systemGrey2.resolveFrom(context),
	);
	}
	}