flutter_adaptive_scaffold 0.3.0

Widgets to easily build adaptive layouts, including navigation elements.

example/lib/main.dart

// Copyright 2013 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/material.dart';
import 'package:flutter_adaptive_scaffold/flutter_adaptive_scaffold.dart';

/// A more functional demo of the usage of the adaptive layout helper widgets.
/// Specifically, it is built using an [AdaptiveLayout] and uses static helpers
/// from [AdaptiveScaffold].
///
/// Modeled off of the example on the Material 3 page regarding adaptive layouts.
/// For a more clear cut example usage, please look at adaptive_layout_demo.dart
/// or adaptive_scaffold_demo.dart

void main() {
  runApp(const MyApp());
}

/// The main application widget for this example.
class MyApp extends StatelessWidget {
  /// Creates a const main application widget.
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Adaptive Layout Demo',
      routes: <String, Widget Function(BuildContext)>{
        _ExtractRouteArguments.routeName: (_) => const _ExtractRouteArguments()
      },
      theme: ThemeData(
        primarySwatch: Colors.deepPurple,
      ),
      home: const MyHomePage(),
    );
  }
}

/// Creates an example mail page using [AdaptiveLayout].
class MyHomePage extends StatefulWidget {
  /// Creates a const [MyHomePage].
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with TickerProviderStateMixin, ChangeNotifier {
  // A listener used for the controllers to reanimate the staggered animation of
  // the navigation elements.
  ValueNotifier<bool?> showGridView = ValueNotifier<bool?>(false);

  // Override the application's directionality.
  TextDirection directionalityOverride = TextDirection.ltr;

  // The index of the selected mail card.
  int? selected;

  void selectCard(int? index) {
    setState(() {
      selected = index;
    });
  }

  // The index of the navigation screen. Only impacts body/secondaryBody
  int _navigationIndex = 0;

  // The controllers used for the staggered animation of the navigation elements.
  late AnimationController _inboxIconSlideController;
  late AnimationController _articleIconSlideController;
  late AnimationController _chatIconSlideController;
  late AnimationController _videoIconSlideController;

  @override
  void initState() {
    showGridView.addListener(() {
      Navigator.popUntil(
          context, (Route<dynamic> route) => route.settings.name == '/');
      _inboxIconSlideController
        ..reset()
        ..forward();
      _articleIconSlideController
        ..reset()
        ..forward();
      _chatIconSlideController
        ..reset()
        ..forward();
      _videoIconSlideController
        ..reset()
        ..forward();
    });
    _inboxIconSlideController = AnimationController(
      duration: const Duration(milliseconds: 100),
      vsync: this,
    )..forward();
    _articleIconSlideController = AnimationController(
      duration: const Duration(milliseconds: 120),
      vsync: this,
    )..forward();
    _chatIconSlideController = AnimationController(
      duration: const Duration(milliseconds: 140),
      vsync: this,
    )..forward();
    _videoIconSlideController = AnimationController(
      duration: const Duration(milliseconds: 160),
      vsync: this,
    )..forward();
    super.initState();
  }

  @override
  void dispose() {
    _inboxIconSlideController.dispose();
    _articleIconSlideController.dispose();
    _chatIconSlideController.dispose();
    _videoIconSlideController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final Widget trailingNavRail = Expanded(
      child: Column(
        children: <Widget>[
          const Divider(color: Colors.white, thickness: 1.5),
          const SizedBox(height: 10),
          Row(children: <Widget>[
            const SizedBox(width: 22),
            Text('Folders',
                style: TextStyle(fontSize: 13, color: Colors.grey[700]))
          ]),
          const SizedBox(height: 22),
          Row(
            children: <Widget>[
              const SizedBox(width: 16),
              IconButton(
                onPressed: () {},
                icon: const Icon(Icons.folder_copy_outlined),
                iconSize: 21,
              ),
              const SizedBox(width: 21),
              const Text('Freelance', overflow: TextOverflow.ellipsis),
            ],
          ),
          const SizedBox(height: 16),
          Row(
            children: <Widget>[
              const SizedBox(width: 16),
              IconButton(
                onPressed: () {},
                icon: const Icon(Icons.folder_copy_outlined),
                iconSize: 21,
              ),
              const SizedBox(width: 21),
              const Text('Mortgage', overflow: TextOverflow.ellipsis),
            ],
          ),
          const SizedBox(height: 16),
          Row(
            children: <Widget>[
              const SizedBox(width: 16),
              IconButton(
                onPressed: () {},
                icon: const Icon(Icons.folder_copy_outlined),
                iconSize: 21,
              ),
              const SizedBox(width: 21),
              const Flexible(
                  child: Text('Taxes', overflow: TextOverflow.ellipsis))
            ],
          ),
          const SizedBox(height: 16),
          Row(
            children: <Widget>[
              const SizedBox(width: 16),
              IconButton(
                onPressed: () {},
                icon: const Icon(Icons.folder_copy_outlined),
                iconSize: 21,
              ),
              const SizedBox(width: 21),
              const Flexible(
                  child: Text('Receipts', overflow: TextOverflow.ellipsis))
            ],
          ),
          Expanded(
            child: Align(
              alignment: Alignment.bottomCenter,
              child: SwitchListTile.adaptive(
                title: const Text(
                  'Directionality',
                  style: TextStyle(fontSize: 12),
                ),
                subtitle: Text(
                  directionalityOverride == TextDirection.ltr ? 'LTR' : 'RTL',
                ),
                value: directionalityOverride == TextDirection.ltr,
                onChanged: (bool value) {
                  setState(() {
                    if (value) {
                      directionalityOverride = TextDirection.ltr;
                    } else {
                      directionalityOverride = TextDirection.rtl;
                    }
                  });
                },
              ),
            ),
          ),
        ],
      ),
    );

    // These are the destinations used within the AdaptiveScaffold navigation
    // builders.
    const List<NavigationDestination> destinations = <NavigationDestination>[
      NavigationDestination(
        label: 'Inbox',
        icon: Icon(Icons.inbox),
      ),
      NavigationDestination(
        label: 'Articles',
        icon: Icon(Icons.article_outlined),
      ),
      NavigationDestination(
        label: 'Chat',
        icon: Icon(Icons.chat_bubble_outline),
      ),
      NavigationDestination(
        label: 'Video',
        icon: Icon(Icons.video_call_outlined),
      )
    ];

    // Updating the listener value.
    showGridView.value = Breakpoints.mediumAndUp.isActive(context);

    return Directionality(
      textDirection: directionalityOverride,
      child: Scaffold(
        backgroundColor: const Color.fromARGB(255, 234, 227, 241),
        // Usage of AdaptiveLayout suite begins here. AdaptiveLayout takes
        // LayoutSlots for its variety of screen slots.
        body: AdaptiveLayout(
          // Each SlotLayout has a config which maps Breakpoints to
          // SlotLayoutConfigs.
          primaryNavigation: SlotLayout(
            config: <Breakpoint, SlotLayoutConfig?>{
              // The breakpoint used here is from the Breakpoints class but custom
              // Breakpoints can be defined by extending the Breakpoint class
              Breakpoints.medium: SlotLayout.from(
                // Every SlotLayoutConfig takes a key and a builder. The builder
                // is to save memory that would be spent on initialization.
                key: const Key('primaryNavigation'),
                builder: (_) {
                  return AdaptiveScaffold.standardNavigationRail(
                    // Usually it would be easier to use a builder from
                    // AdaptiveScaffold for these types of navigation but this
                    // navigation has custom staggered item animations.
                    onDestinationSelected: (int index) {
                      setState(() {
                        _navigationIndex = index;
                      });
                    },
                    selectedIndex: _navigationIndex,
                    leading: ScaleTransition(
                      scale: _articleIconSlideController,
                      child: const _MediumComposeIcon(),
                    ),
                    backgroundColor: const Color.fromARGB(0, 255, 255, 255),
                    destinations: <NavigationRailDestination>[
                      slideInNavigationItem(
                        begin: -1,
                        controller: _inboxIconSlideController,
                        icon: Icons.inbox,
                        label: 'Inbox',
                      ),
                      slideInNavigationItem(
                        begin: -2,
                        controller: _articleIconSlideController,
                        icon: Icons.article_outlined,
                        label: 'Articles',
                      ),
                      slideInNavigationItem(
                        begin: -3,
                        controller: _chatIconSlideController,
                        icon: Icons.chat_bubble_outline,
                        label: 'Chat',
                      ),
                      slideInNavigationItem(
                        begin: -4,
                        controller: _videoIconSlideController,
                        icon: Icons.video_call_outlined,
                        label: 'Video',
                      )
                    ],
                  );
                },
              ),
              Breakpoints.mediumLarge: SlotLayout.from(
                key: const Key('MediumLarge primaryNavigation'),
                // The AdaptiveScaffold builder here greatly simplifies
                // navigational elements.
                builder: (_) => AdaptiveScaffold.standardNavigationRail(
                  leading: const _LargeComposeIcon(),
                  onDestinationSelected: (int index) {
                    setState(() {
                      _navigationIndex = index;
                    });
                  },
                  selectedIndex: _navigationIndex,
                  trailing: trailingNavRail,
                  extended: true,
                  destinations:
                      destinations.map((NavigationDestination destination) {
                    return AdaptiveScaffold.toRailDestination(destination);
                  }).toList(),
                ),
              ),
              Breakpoints.large: SlotLayout.from(
                key: const Key('Large primaryNavigation'),
                // The AdaptiveScaffold builder here greatly simplifies
                // navigational elements.
                builder: (_) => AdaptiveScaffold.standardNavigationRail(
                  leading: const _LargeComposeIcon(),
                  onDestinationSelected: (int index) {
                    setState(() {
                      _navigationIndex = index;
                    });
                  },
                  selectedIndex: _navigationIndex,
                  trailing: trailingNavRail,
                  extended: true,
                  destinations:
                      destinations.map((NavigationDestination destination) {
                    return AdaptiveScaffold.toRailDestination(destination);
                  }).toList(),
                ),
              ),
              Breakpoints.extraLarge: SlotLayout.from(
                key: const Key('ExtraLarge primaryNavigation'),
                // The AdaptiveScaffold builder here greatly simplifies
                // navigational elements.
                builder: (_) => AdaptiveScaffold.standardNavigationRail(
                  leading: const _LargeComposeIcon(),
                  onDestinationSelected: (int index) {
                    setState(() {
                      _navigationIndex = index;
                    });
                  },
                  selectedIndex: _navigationIndex,
                  trailing: trailingNavRail,
                  extended: true,
                  destinations:
                      destinations.map((NavigationDestination destination) {
                    return AdaptiveScaffold.toRailDestination(destination);
                  }).toList(),
                ),
              ),
            },
          ),
          body: SlotLayout(
            config: <Breakpoint, SlotLayoutConfig?>{
              Breakpoints.standard: SlotLayout.from(
                key: const Key('body'),
                // The conditional here is for navigation screens. The first
                // screen shows the main screen and every other screen shows
                //  ExamplePage.
                builder: (_) => (_navigationIndex == 0)
                    ? Padding(
                        padding: const EdgeInsets.fromLTRB(0, 32, 0, 0),
                        child: _ItemList(
                          selected: selected,
                          items: _allItems,
                          selectCard: selectCard,
                        ),
                      )
                    : const _ExamplePage(),
              ),
            },
          ),
          secondaryBody: _navigationIndex == 0
              ? SlotLayout(
                  config: <Breakpoint, SlotLayoutConfig?>{
                    Breakpoints.mediumAndUp: SlotLayout.from(
                      // This overrides the default behavior of the secondaryBody
                      // disappearing as it is animating out.
                      outAnimation: AdaptiveScaffold.stayOnScreen,
                      key: const Key('Secondary Body'),
                      builder: (_) => SafeArea(
                        child: _DetailTile(item: _allItems[selected ?? 0]),
                      ),
                    )
                  },
                )
              : null,
          bottomNavigation: SlotLayout(
            config: <Breakpoint, SlotLayoutConfig?>{
              Breakpoints.small: SlotLayout.from(
                key: const Key('bottomNavigation'),
                // You can define inAnimations or outAnimations to override the
                // default offset transition.
                outAnimation: AdaptiveScaffold.topToBottom,
                builder: (_) => AdaptiveScaffold.standardBottomNavigationBar(
                  destinations: destinations,
                ),
              )
            },
          ),
        ),
      ),
    );
  }

  NavigationRailDestination slideInNavigationItem({
    required double begin,
    required AnimationController controller,
    required IconData icon,
    required String label,
  }) {
    return NavigationRailDestination(
      icon: SlideTransition(
        position: Tween<Offset>(
          begin: Offset(begin, 0),
          end: Offset.zero,
        ).animate(
          CurvedAnimation(parent: controller, curve: Curves.easeInOutCubic),
        ),
        child: Icon(icon),
      ),
      label: Text(label),
    );
  }
}

class _SmallComposeIcon extends StatelessWidget {
  const _SmallComposeIcon();

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        color: const Color.fromARGB(255, 254, 215, 227),
        borderRadius: const BorderRadius.all(Radius.circular(15)),
        boxShadow: <BoxShadow>[
          BoxShadow(
            color: Colors.grey.withOpacity(0.5),
            spreadRadius: 1,
            blurRadius: 2,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      width: 50,
      height: 50,
      child: const Icon(Icons.edit_outlined),
    );
  }
}

class _MediumComposeIcon extends StatelessWidget {
  const _MediumComposeIcon();

  @override
  Widget build(BuildContext context) {
    return Column(children: <Widget>[
      Container(
        padding: const EdgeInsets.fromLTRB(0, 10, 0, 18),
        child: const Icon(Icons.menu),
      ),
      const _SmallComposeIcon(),
    ]);
  }
}

class _LargeComposeIcon extends StatelessWidget {
  const _LargeComposeIcon();

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(8.0, 5, 0, 12),
      child: Column(children: <Widget>[
        Container(
          padding: const EdgeInsets.fromLTRB(6, 0, 0, 0),
          child: const Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: <Widget>[
              Text(
                'REPLY',
                style: TextStyle(color: Colors.deepPurple, fontSize: 15),
              ),
              Icon(Icons.menu_open, size: 22)
            ],
          ),
        ),
        const SizedBox(height: 10),
        Container(
          alignment: Alignment.centerLeft,
          decoration: BoxDecoration(
            color: const Color.fromARGB(255, 255, 225, 231),
            borderRadius: const BorderRadius.all(Radius.circular(15)),
            boxShadow: Breakpoints.mediumAndUp.isActive(context)
                ? null
                : <BoxShadow>[
                    BoxShadow(
                      color: Colors.grey.withOpacity(0.5),
                      spreadRadius: 1,
                      blurRadius: 2,
                      offset: const Offset(0, 2),
                    ),
                  ],
          ),
          width: 200,
          height: 50,
          child: const Padding(
            padding: EdgeInsets.fromLTRB(16.0, 0, 0, 0),
            child: Row(
              children: <Widget>[
                Icon(Icons.edit_outlined),
                SizedBox(width: 20),
                Center(child: Text('Compose')),
              ],
            ),
          ),
        )
      ]),
    );
  }
}

typedef _CardSelectedCallback = void Function(int?);

// ItemList creates the list of cards and the search bar.
class _ItemList extends StatelessWidget {
  const _ItemList({
    required this.items,
    required this.selectCard,
    required this.selected,
  });

  final List<_Item> items;
  final int? selected;
  final _CardSelectedCallback selectCard;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color.fromARGB(0, 0, 0, 0),
      floatingActionButton: Breakpoints.mediumAndUp.isActive(context)
          ? null
          : const _SmallComposeIcon(),
      body: Column(
        children: <Widget>[
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextField(
              decoration: InputDecoration(
                prefixIcon: const Padding(
                  padding: EdgeInsets.fromLTRB(20, 0, 20, 0),
                  child: Icon(Icons.search),
                ),
                suffixIcon: Padding(
                  padding: const EdgeInsets.fromLTRB(20, 0, 20, 0),
                  child: CircleAvatar(
                    radius: 18,
                    child: Image.asset(
                      'images/plum.png',
                      width: 100,
                      height: 100,
                      fit: BoxFit.cover,
                    ),
                  ),
                ),
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(30.0),
                  borderSide: BorderSide.none,
                ),
                filled: true,
                contentPadding: const EdgeInsets.all(25),
                hintStyle:
                    const TextStyle(color: Color.fromARGB(255, 135, 129, 138)),
                hintText: 'Search replies',
                fillColor: Colors.white,
              ),
            ),
          ),
          Expanded(
            child: ListView.builder(
              itemCount: items.length,
              itemBuilder: (BuildContext context, int index) => _ItemListTile(
                item: items[index],
                email: items[index].emails![0],
                selectCard: selectCard,
                selected: selected,
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _ItemListTile extends StatelessWidget {
  const _ItemListTile({
    required this.item,
    required this.email,
    required this.selectCard,
    required this.selected,
  });

  final _Item item;
  final _Email email;
  final int? selected;
  final _CardSelectedCallback selectCard;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        // The behavior of opening a detail view is different on small screens
        // than large screens.
        // Small screens open a modal with the detail view while large screens
        // simply show the details on the secondaryBody.
        selectCard(_allItems.indexOf(item));
        if (!Breakpoints.mediumAndUp.isActive(context)) {
          Navigator.of(context).pushNamed(_ExtractRouteArguments.routeName,
              arguments: _ScreenArguments(item: item, selectCard: selectCard));
        } else {
          selectCard(_allItems.indexOf(item));
        }
      },
      child: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Container(
          decoration: BoxDecoration(
            color: selected == _allItems.indexOf(item)
                ? const Color.fromARGB(255, 234, 222, 255)
                : const Color.fromARGB(255, 243, 237, 247),
            borderRadius: const BorderRadius.all(Radius.circular(10)),
          ),
          child: Padding(
            padding: const EdgeInsets.all(16.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                ListTile(
                  contentPadding: EdgeInsets.zero,
                  leading: CircleAvatar(
                    radius: 18,
                    child: Image.asset(
                      email.image,
                      width: 100,
                      height: 100,
                      fit: BoxFit.cover,
                    ),
                  ),
                  title: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      Text(
                        email.sender,
                        style: Theme.of(context).textTheme.bodyLarge,
                        softWrap: false,
                        overflow: TextOverflow.clip,
                      ),
                      const SizedBox(height: 3),
                      Text(
                        '${email.time} ago',
                        style: Theme.of(context).textTheme.bodySmall,
                        softWrap: false,
                        overflow: TextOverflow.clip,
                      ),
                    ],
                  ),
                  trailing: Container(
                    padding: const EdgeInsets.all(8.0),
                    decoration: const BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.all(Radius.circular(50)),
                    ),
                    child: Icon(Icons.star_outline, color: Colors.grey[500]),
                  ),
                ),
                const SizedBox(height: 13),
                Text(item.title,
                    style: Theme.of(context).textTheme.titleMedium),
                const SizedBox(height: 9),
                Text(email.body.replaceRange(116, email.body.length, '...'),
                    style: Theme.of(context).textTheme.bodyLarge),
                const SizedBox(height: 9),
                SizedBox(
                  width: MediaQuery.of(context).size.width,
                  child: (email.bodyImage != '')
                      ? Image.asset(email.bodyImage)
                      : Container(),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class _DetailTile extends StatelessWidget {
  const _DetailTile({required this.item});

  final _Item item;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: SizedBox(
        height: MediaQuery.of(context).size.height,
        child: Container(
          decoration: const BoxDecoration(
            color: Color.fromARGB(255, 245, 241, 248),
            borderRadius: BorderRadius.all(Radius.circular(10)),
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.fromLTRB(16, 16, 16, 0),
                child: Column(
                  children: <Widget>[
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: <Widget>[
                        Expanded(
                          child: Container(
                            padding: const EdgeInsets.fromLTRB(5, 0, 5, 0),
                            child: Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              children: <Widget>[
                                Text(
                                  item.title,
                                  style: Theme.of(context).textTheme.titleLarge,
                                ),
                                const SizedBox(height: 7),
                                Text(
                                  '${item.emails!.length} Messages',
                                  style: Theme.of(context).textTheme.labelSmall,
                                )
                              ],
                            ),
                          ),
                        ),
                        Container(
                          padding: const EdgeInsets.fromLTRB(5, 0, 5, 0),
                          child: Row(
                            children: <Widget>[
                              Container(
                                padding: const EdgeInsets.all(8.0),
                                decoration: const BoxDecoration(
                                  color: Colors.white,
                                  borderRadius:
                                      BorderRadius.all(Radius.circular(15)),
                                ),
                                child: Icon(
                                  Icons.restore_from_trash,
                                  color: Colors.grey[600],
                                ),
                              ),
                              const SizedBox(width: 15),
                              Container(
                                padding: const EdgeInsets.all(8.0),
                                decoration: const BoxDecoration(
                                  color: Colors.white,
                                  borderRadius:
                                      BorderRadius.all(Radius.circular(15)),
                                ),
                                child: Icon(Icons.more_vert,
                                    color: Colors.grey[600]),
                              )
                            ],
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 20),
                  ],
                ),
              ),
              Expanded(
                child: ListView.builder(
                  itemCount: item.emails!.length,
                  itemBuilder: (BuildContext context, int index) {
                    final _Email thisEmail = item.emails![index];
                    return _EmailTile(
                      sender: thisEmail.sender,
                      time: thisEmail.time,
                      senderIcon: thisEmail.image,
                      recipients: thisEmail.recipients,
                      body: thisEmail.body,
                      bodyImage: thisEmail.bodyImage,
                    );
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class _EmailTile extends StatelessWidget {
  const _EmailTile({
    required this.sender,
    required this.time,
    required this.senderIcon,
    required this.recipients,
    required this.body,
    required this.bodyImage,
  });

  final String sender;
  final String time;
  final String senderIcon;
  final String recipients;
  final String body;
  final String bodyImage;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(0, 4, 0, 4),
      child: Container(
        decoration: const BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.all(Radius.circular(10)),
        ),
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Row(
                children: <Widget>[
                  CircleAvatar(
                    radius: 18,
                    child: Image.asset(
                      senderIcon,
                      width: 100,
                      height: 100,
                      fit: BoxFit.cover,
                    ),
                  ),
                  const SizedBox(width: 8),
                  Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      Text(sender,
                          style:
                              TextStyle(color: Colors.grey[850], fontSize: 13)),
                      const SizedBox(height: 3),
                      Text('$time ago',
                          style: Theme.of(context).textTheme.bodySmall),
                    ],
                  ),
                  const Spacer(),
                  Container(
                    padding: const EdgeInsets.all(8.0),
                    decoration: const BoxDecoration(
                      color: Color.fromARGB(255, 245, 241, 248),
                      borderRadius: BorderRadius.all(Radius.circular(50)),
                    ),
                    child: Icon(Icons.star_outline, color: Colors.grey[500]),
                  ),
                ],
              ),
              if (recipients != '')
                Column(children: <Widget>[
                  const SizedBox(height: 15),
                  Text('To $recipients',
                      style: TextStyle(color: Colors.grey[500], fontSize: 12)),
                ])
              else
                Container(),
              const SizedBox(height: 15),
              Text(body,
                  style: TextStyle(
                      color: Colors.grey[700], height: 1.35, fontSize: 14.5)),
              const SizedBox(height: 9),
              SizedBox(
                  width: MediaQuery.of(context).size.width,
                  child:
                      (bodyImage != '') ? Image.asset(bodyImage) : Container()),
              const SizedBox(height: 10),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: <Widget>[
                  SizedBox(
                    width: 126,
                    child: OutlinedButton(
                      onPressed: () {},
                      style: ButtonStyle(
                        shape: WidgetStateProperty.all(
                          RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(30.0)),
                        ),
                        backgroundColor: WidgetStateProperty.all<Color>(
                          const Color.fromARGB(255, 245, 241, 248),
                        ),
                        side: WidgetStateProperty.all(
                          const BorderSide(
                              width: 0.0, color: Colors.transparent),
                        ),
                      ),
                      child: Text('Reply',
                          style:
                              TextStyle(color: Colors.grey[700], fontSize: 12)),
                    ),
                  ),
                  SizedBox(
                    width: 126,
                    child: OutlinedButton(
                      onPressed: () {},
                      style: ButtonStyle(
                        shape: WidgetStateProperty.all(
                          RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(30.0)),
                        ),
                        backgroundColor: WidgetStateProperty.all<Color>(
                          const Color.fromARGB(255, 245, 241, 248),
                        ),
                        side: WidgetStateProperty.all(
                          const BorderSide(
                              width: 0.0, color: Colors.transparent),
                        ),
                      ),
                      child: Text(
                        'Reply all',
                        style: TextStyle(color: Colors.grey[700], fontSize: 12),
                      ),
                    ),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}

// The ScreenArguments used to pass arguments to the RouteDetailView as a named
// route.
class _ScreenArguments {
  _ScreenArguments({
    required this.item,
    required this.selectCard,
  });

  final _Item item;
  final _CardSelectedCallback selectCard;
}

class _ExtractRouteArguments extends StatelessWidget {
  const _ExtractRouteArguments();

  static const String routeName = '/detailView';

  @override
  Widget build(BuildContext context) {
    final _ScreenArguments args =
        ModalRoute.of(context)!.settings.arguments! as _ScreenArguments;

    return _RouteDetailView(item: args.item, selectCard: args.selectCard);
  }
}

class _RouteDetailView extends StatelessWidget {
  const _RouteDetailView({
    required this.item,
    required this.selectCard,
  });

  final _Item item;
  final _CardSelectedCallback selectCard;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: <Widget>[
          Align(
            alignment: Alignment.topLeft,
            child: TextButton(
              onPressed: () {
                Navigator.popUntil(context,
                    (Route<dynamic> route) => route.settings.name == '/');
                selectCard(null);
              },
              child: const Icon(Icons.arrow_back),
            ),
          ),
          Expanded(child: _DetailTile(item: item)),
        ],
      ),
    );
  }
}

class _ExamplePage extends StatelessWidget {
  const _ExamplePage();

  @override
  Widget build(BuildContext context) {
    return Container(color: Colors.grey);
  }
}

class _Item {
  const _Item({
    required this.title,
    required this.emails,
  });

  final String title;
  final List<_Email>? emails;
}

class _Email {
  const _Email({
    required this.sender,
    required this.recipients,
    required this.image,
    required this.time,
    required this.body,
    required this.bodyImage,
  });

  final String sender;
  final String recipients;
  final String image;
  final String time;
  final String body;
  final String bodyImage;
}

/// List of items, each representing a thread of emails which will populate
/// the different layouts.
const List<_Item> _allItems = <_Item>[
  _Item(
    title: 'Dinner Club',
    emails: <_Email>[
      _Email(
        sender: 'So Duri',
        recipients: 'me, Ziad and Lily',
        image: 'images/strawberry.png',
        time: '20 min',
        body:
            'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer nec gravida tellus, vel scelerisque nisi. Mauris egestas, augue nec dictum tempus, diam sapien luctus odio, a posuere sem neque at nulla. Vivamus pulvinar nisi et dapibus dapibus. Donec euismod pellentesque ultrices. Vivamus quis condimentum metus, in venenatis lorem. Proin suscipit tincidunt eleifend. Praesent a nisi ac ipsum sodales gravida.',
        bodyImage: '',
      ),
      _Email(
          sender: 'Me',
          recipients: 'me, Ziad, and Lily',
          image: 'images/plum.png',
          time: '4 min',
          body:
              'Donec non mollis nulla, in varius mi. Ut id lorem eget felis lobortis tincidunt. Curabitur facilisis ex vitae tristique efficitur. Aenean eget augue finibus, tempor eros vitae, tempor neque. In sed pellentesque elit. Donec lacus lacus, malesuada in tincidunt sit amet, condimentum vel enim. Cras dapibus erat quis nisl hendrerit, vel pretium turpis condimentum. ',
          bodyImage: ''),
      _Email(
          sender: 'Ziad Aouad',
          recipients: 'me, Ziad and Lily',
          image: 'images/mushroom.png',
          time: '2 min',
          body:
              'Duis sit amet nibh a diam placerat aliquam nec ac mi. Aenean hendrerit efficitur tellus, non pharetra eros posuere sit amet. Maecenas interdum lacinia eleifend. Nam efficitur tellus et dolor vestibulum, non dictum quam iaculis. Aenean id nulla ut erat placerat feugiat. Mauris in quam metus. Aliquam erat volutpat.',
          bodyImage: ''),
    ],
  ),
  _Item(
    title: '7 Best Yoga Poses',
    emails: <_Email>[
      _Email(
        sender: 'Elaine Howley',
        time: '2 hours',
        body:
            'Curabitur tincidunt purus at vulputate mattis. Nam lectus urna, varius eget quam in, ultricies ultrices libero. Curabitur rutrum ultricies varius. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec vulputate auctor est, non semper velit eleifend sit amet.',
        image: 'images/potato.png',
        bodyImage: 'images/avocado.png',
        recipients: '',
      ),
    ],
  ),
  _Item(
    title: 'A Programming Language',
    emails: <_Email>[
      _Email(
        sender: 'Laney Mansell',
        time: '10 min',
        body:
            'Cras egestas ultricies elit, vitae interdum lorem aliquam et. Donec quis arcu a quam tempor rutrum vitae in lectus. Nullam elit nunc, lacinia sed luctus non, mollis id nulla. Morbi luctus turpis sapien, id molestie ante maximus vel. Vivamus sagittis consequat nisl nec placerat.',
        image: 'images/habanero.png',
        bodyImage: '',
        recipients: '',
      ),
    ],
  ),
];