Flutter 有没有办法将导航路线添加到颤振/省道列表中？

我不熟悉颤振/飞镖，但我尝试了几种方法将导航路线添加到指定给栅格视图的列表中。这可能不是最有效的方法，但却是我想到的第一件事。我想在卡片上加一个墨水池，让导航路线通过。除此之外，我能想到的唯一其他解决方案是创建一个在列表中迭代的OnTap函数。目前，导航列表选项给了我一个错误，即“未来对象不能分配给导航器的参数类型”，我得到这个错误是因为它是一个常量。但我尝试了其他一些方法，得到了类似的结果。我当前的配置有什么问题？是否有更好/更有效的解决方案

这是我的选择列表：

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final Navigator nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: Navigator.pushNamed(context, TestConfirmation.id)),
  const Choice(title: 'Seating Chart', icon: Icons.event_seat),
  const Choice(title: 'Random', icon: Icons.shuffle),
  const Choice(title: 'Group Maker', icon: Icons.group_add),
  const Choice(title: 'Noise Monitor', icon: Icons.hearing),
  const Choice(title: 'Assign Tasks', icon: Icons.assignment_ind),
  const Choice(title: 'Survey', icon: Icons.rate_review),
  const Choice(title: 'Permission Slips', icon: Icons.assignment),
  const Choice(title: 'Lesson Plans', icon: Icons.local_library),
  const Choice(title: 'Attendance', icon: Icons.schedule),
  const Choice(title: 'Gradebook', icon: Icons.insert_chart)
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          //onTap: choice.navigation,
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                      child: Icon(choice.icon,
                          size: 90.0, color: textStyle.color)),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final String nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: timer),
  const Choice(
      title: 'Seating Chart', icon: Icons.event_seat, nav: seatingChart),
  const Choice(title: 'Random', icon: Icons.shuffle, nav: randomPicker),
  const Choice(title: 'Group Maker', icon: Icons.group_add, nav: groupMaker),
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          onTap: () {
            Navigator.pushNamed(context, choice.nav);
          },
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child:
                        Icon(choice.icon, size: 90.0, color: textStyle.color),
                  ),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Router {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case assignTasks:
        return MaterialPageRoute(builder: (_) => AssignTasks());
      case attendance:
        return MaterialPageRoute(builder: (_) => Attendance());
      case gradeBook:
        return MaterialPageRoute(builder: (_) => GradeBook());
      case groupMaker:
        return MaterialPageRoute(builder: (_) => GroupMaker());
            default:
        return MaterialPageRoute(
            builder: (_) => Scaffold(
                  body: Center(
                      child: Text('No route defined for ${settings.name}')),
                ));
    }
  }
}

//Dynamic Routes for generating navigation
const String assignTasks = AssignTasks.id;
const String attendance = ProfileForm.id;
const String gradeBook = ClassProfile.id;
const String groupMaker = GroupMaker.id;

类选择{
常量选择（{this.title，this.icon，this.nav}）；
最后的字符串标题；
最终的Iconda图标；
最终导航仪导航；
}
常量列表选项=常量[
常量选项（标题：“计时器”，图标：Icons.Timer，导航：Navigator.pushNamed（上下文，TestConfirmation.id）），
常量选择（标题：“座位表”，图标：图标。事件座位），
常量选择（标题：“随机”，图标：图标。随机），
常量选择（标题：“组生成器”，图标：图标。组添加），
常量选择（标题：“噪音监视器”，图标：图标。听力），
常量选项（标题：“分配任务”，图标：Icons.assignment\u ind），
常数选择（标题：“调查”，图标：图标。费率审查），
const选项（标题：“权限单”，图标：Icons.assignment），
const选项（标题：“课程计划”，图标：Icons.local_library），
常数选择（标题：“出席”，图标：图标。时间表），
常量选项（标题：“成绩册”，图标：图标。插入图表）
];

这是我的名片：

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final Navigator nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: Navigator.pushNamed(context, TestConfirmation.id)),
  const Choice(title: 'Seating Chart', icon: Icons.event_seat),
  const Choice(title: 'Random', icon: Icons.shuffle),
  const Choice(title: 'Group Maker', icon: Icons.group_add),
  const Choice(title: 'Noise Monitor', icon: Icons.hearing),
  const Choice(title: 'Assign Tasks', icon: Icons.assignment_ind),
  const Choice(title: 'Survey', icon: Icons.rate_review),
  const Choice(title: 'Permission Slips', icon: Icons.assignment),
  const Choice(title: 'Lesson Plans', icon: Icons.local_library),
  const Choice(title: 'Attendance', icon: Icons.schedule),
  const Choice(title: 'Gradebook', icon: Icons.insert_chart)
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          //onTap: choice.navigation,
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                      child: Icon(choice.icon,
                          size: 90.0, color: textStyle.color)),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final String nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: timer),
  const Choice(
      title: 'Seating Chart', icon: Icons.event_seat, nav: seatingChart),
  const Choice(title: 'Random', icon: Icons.shuffle, nav: randomPicker),
  const Choice(title: 'Group Maker', icon: Icons.group_add, nav: groupMaker),
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          onTap: () {
            Navigator.pushNamed(context, choice.nav);
          },
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child:
                        Icon(choice.icon, size: 90.0, color: textStyle.color),
                  ),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Router {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case assignTasks:
        return MaterialPageRoute(builder: (_) => AssignTasks());
      case attendance:
        return MaterialPageRoute(builder: (_) => Attendance());
      case gradeBook:
        return MaterialPageRoute(builder: (_) => GradeBook());
      case groupMaker:
        return MaterialPageRoute(builder: (_) => GroupMaker());
            default:
        return MaterialPageRoute(
            builder: (_) => Scaffold(
                  body: Center(
                      child: Text('No route defined for ${settings.name}')),
                ));
    }
  }
}

//Dynamic Routes for generating navigation
const String assignTasks = AssignTasks.id;
const String attendance = ProfileForm.id;
const String gradeBook = ClassProfile.id;
const String groupMaker = GroupMaker.id;

class ChoiceCard扩展了无状态小部件{
const ChoiceCard（{Key-Key，this.choice}）：super（Key:Key）；
最终选择；
@凌驾
小部件构建（构建上下文）{
final TextStyle TextStyle=Theme.of（context）.textTheme.subhead；
回程卡(
颜色：颜色，白色，
孩子：InkWell(
//onTap:choice.navigation，
儿童：中心(
子：列(
mainAxisSize:mainAxisSize.min，
crossAxisAlignment:crossAxisAlignment.center，
儿童：[
扩大(
子：图标（choice.Icon，
尺寸：90.0，颜色：textStyle.color），
文本（choice.title，style:textStyle），
]),
),
));
}
}

我能够通过使用GeneratorOute并构建一个单独的route类来解决这个问题。我用更小的数据集发布解决方案，以防将来有人遇到类似的问题

选择类：

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final Navigator nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: Navigator.pushNamed(context, TestConfirmation.id)),
  const Choice(title: 'Seating Chart', icon: Icons.event_seat),
  const Choice(title: 'Random', icon: Icons.shuffle),
  const Choice(title: 'Group Maker', icon: Icons.group_add),
  const Choice(title: 'Noise Monitor', icon: Icons.hearing),
  const Choice(title: 'Assign Tasks', icon: Icons.assignment_ind),
  const Choice(title: 'Survey', icon: Icons.rate_review),
  const Choice(title: 'Permission Slips', icon: Icons.assignment),
  const Choice(title: 'Lesson Plans', icon: Icons.local_library),
  const Choice(title: 'Attendance', icon: Icons.schedule),
  const Choice(title: 'Gradebook', icon: Icons.insert_chart)
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          //onTap: choice.navigation,
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                      child: Icon(choice.icon,
                          size: 90.0, color: textStyle.color)),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final String nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: timer),
  const Choice(
      title: 'Seating Chart', icon: Icons.event_seat, nav: seatingChart),
  const Choice(title: 'Random', icon: Icons.shuffle, nav: randomPicker),
  const Choice(title: 'Group Maker', icon: Icons.group_add, nav: groupMaker),
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          onTap: () {
            Navigator.pushNamed(context, choice.nav);
          },
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child:
                        Icon(choice.icon, size: 90.0, color: textStyle.color),
                  ),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Router {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case assignTasks:
        return MaterialPageRoute(builder: (_) => AssignTasks());
      case attendance:
        return MaterialPageRoute(builder: (_) => Attendance());
      case gradeBook:
        return MaterialPageRoute(builder: (_) => GradeBook());
      case groupMaker:
        return MaterialPageRoute(builder: (_) => GroupMaker());
            default:
        return MaterialPageRoute(
            builder: (_) => Scaffold(
                  body: Center(
                      child: Text('No route defined for ${settings.name}')),
                ));
    }
  }
}

//Dynamic Routes for generating navigation
const String assignTasks = AssignTasks.id;
const String attendance = ProfileForm.id;
const String gradeBook = ClassProfile.id;
const String groupMaker = GroupMaker.id;

类选择{
常量选择（{this.title，this.icon，this.nav}）；
最后的字符串标题；
最终的Iconda图标；
最终字符串导航；
}
常量列表选项=常量[
常量选择（标题：“计时器”，图标：Icons.Timer，导航：Timer），
常数选择(
标题：“座位图”，图标：Icons.event_座位，导航：座位图），
常量选择（标题：“随机”，图标：Icons.shuffle，导航：randomPicker），
const选项（标题：“groupMaker”，图标：Icons.Group_add，导航：groupMaker），
];

选择卡片类：

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final Navigator nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: Navigator.pushNamed(context, TestConfirmation.id)),
  const Choice(title: 'Seating Chart', icon: Icons.event_seat),
  const Choice(title: 'Random', icon: Icons.shuffle),
  const Choice(title: 'Group Maker', icon: Icons.group_add),
  const Choice(title: 'Noise Monitor', icon: Icons.hearing),
  const Choice(title: 'Assign Tasks', icon: Icons.assignment_ind),
  const Choice(title: 'Survey', icon: Icons.rate_review),
  const Choice(title: 'Permission Slips', icon: Icons.assignment),
  const Choice(title: 'Lesson Plans', icon: Icons.local_library),
  const Choice(title: 'Attendance', icon: Icons.schedule),
  const Choice(title: 'Gradebook', icon: Icons.insert_chart)
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          //onTap: choice.navigation,
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                      child: Icon(choice.icon,
                          size: 90.0, color: textStyle.color)),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final String nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: timer),
  const Choice(
      title: 'Seating Chart', icon: Icons.event_seat, nav: seatingChart),
  const Choice(title: 'Random', icon: Icons.shuffle, nav: randomPicker),
  const Choice(title: 'Group Maker', icon: Icons.group_add, nav: groupMaker),
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          onTap: () {
            Navigator.pushNamed(context, choice.nav);
          },
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child:
                        Icon(choice.icon, size: 90.0, color: textStyle.color),
                  ),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Router {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case assignTasks:
        return MaterialPageRoute(builder: (_) => AssignTasks());
      case attendance:
        return MaterialPageRoute(builder: (_) => Attendance());
      case gradeBook:
        return MaterialPageRoute(builder: (_) => GradeBook());
      case groupMaker:
        return MaterialPageRoute(builder: (_) => GroupMaker());
            default:
        return MaterialPageRoute(
            builder: (_) => Scaffold(
                  body: Center(
                      child: Text('No route defined for ${settings.name}')),
                ));
    }
  }
}

//Dynamic Routes for generating navigation
const String assignTasks = AssignTasks.id;
const String attendance = ProfileForm.id;
const String gradeBook = ClassProfile.id;
const String groupMaker = GroupMaker.id;

class ChoiceCard扩展了无状态小部件{
const ChoiceCard（{Key-Key，this.choice}）：super（Key:Key）；
最终选择；
@凌驾
小部件构建（构建上下文）{
final TextStyle TextStyle=Theme.of（context）.textTheme.subhead；
回程卡(
颜色：颜色，白色，
孩子：InkWell(
onTap:（）{
Navigator.pushNamed（context，choice.nav）；
},
儿童：中心(
子：列(
mainAxisSize:mainAxisSize.min，
crossAxisAlignment:crossAxisAlignment.center，
儿童：[
扩大(
儿童：
图标（choice.Icon，大小：90.0，颜色：textStyle.color），
),
文本（choice.title，style:textStyle），
]),
),
));
}
}

路由器类别：

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final Navigator nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: Navigator.pushNamed(context, TestConfirmation.id)),
  const Choice(title: 'Seating Chart', icon: Icons.event_seat),
  const Choice(title: 'Random', icon: Icons.shuffle),
  const Choice(title: 'Group Maker', icon: Icons.group_add),
  const Choice(title: 'Noise Monitor', icon: Icons.hearing),
  const Choice(title: 'Assign Tasks', icon: Icons.assignment_ind),
  const Choice(title: 'Survey', icon: Icons.rate_review),
  const Choice(title: 'Permission Slips', icon: Icons.assignment),
  const Choice(title: 'Lesson Plans', icon: Icons.local_library),
  const Choice(title: 'Attendance', icon: Icons.schedule),
  const Choice(title: 'Gradebook', icon: Icons.insert_chart)
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          //onTap: choice.navigation,
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                      child: Icon(choice.icon,
                          size: 90.0, color: textStyle.color)),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final String nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: timer),
  const Choice(
      title: 'Seating Chart', icon: Icons.event_seat, nav: seatingChart),
  const Choice(title: 'Random', icon: Icons.shuffle, nav: randomPicker),
  const Choice(title: 'Group Maker', icon: Icons.group_add, nav: groupMaker),
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          onTap: () {
            Navigator.pushNamed(context, choice.nav);
          },
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child:
                        Icon(choice.icon, size: 90.0, color: textStyle.color),
                  ),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Router {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case assignTasks:
        return MaterialPageRoute(builder: (_) => AssignTasks());
      case attendance:
        return MaterialPageRoute(builder: (_) => Attendance());
      case gradeBook:
        return MaterialPageRoute(builder: (_) => GradeBook());
      case groupMaker:
        return MaterialPageRoute(builder: (_) => GroupMaker());
            default:
        return MaterialPageRoute(
            builder: (_) => Scaffold(
                  body: Center(
                      child: Text('No route defined for ${settings.name}')),
                ));
    }
  }
}

//Dynamic Routes for generating navigation
const String assignTasks = AssignTasks.id;
const String attendance = ProfileForm.id;
const String gradeBook = ClassProfile.id;
const String groupMaker = GroupMaker.id;

类路由器{
静态路由生成器输出（路由设置）{
开关（设置.名称）{
案例任务：
返回MaterialPackageRoute（生成器：（）=>AssignTasks（））；
个案出席人数：
返回MaterialPage路线（生成器：（）=>Attention（））；
个案成绩册：
返回MaterialPage路线（生成器：（）=>成绩册（））；
案例组制作人：
返回MaterialPackageRoute（生成器：（）=>GroupMaker（））；
违约：
返回物料路线(
建造商：（）=>脚手架(
正文：中(
子项：Text（'No route defined for${settings.name}'），
));
}
}
}
//生成导航的动态路线
常量字符串assignTasks=assignTasks.id；
const String attention=ProfileForm.id；
常量字符串成绩册=ClassProfile.id；
常量字符串groupMaker=groupMaker.id；

我能够通过使用GeneratorOute并构建一个单独的route类来解决这个问题。我用更小的数据集发布解决方案，以防将来有人遇到类似的问题

选择类：

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final Navigator nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: Navigator.pushNamed(context, TestConfirmation.id)),
  const Choice(title: 'Seating Chart', icon: Icons.event_seat),
  const Choice(title: 'Random', icon: Icons.shuffle),
  const Choice(title: 'Group Maker', icon: Icons.group_add),
  const Choice(title: 'Noise Monitor', icon: Icons.hearing),
  const Choice(title: 'Assign Tasks', icon: Icons.assignment_ind),
  const Choice(title: 'Survey', icon: Icons.rate_review),
  const Choice(title: 'Permission Slips', icon: Icons.assignment),
  const Choice(title: 'Lesson Plans', icon: Icons.local_library),
  const Choice(title: 'Attendance', icon: Icons.schedule),
  const Choice(title: 'Gradebook', icon: Icons.insert_chart)
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          //onTap: choice.navigation,
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                      child: Icon(choice.icon,
                          size: 90.0, color: textStyle.color)),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final String nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: timer),
  const Choice(
      title: 'Seating Chart', icon: Icons.event_seat, nav: seatingChart),
  const Choice(title: 'Random', icon: Icons.shuffle, nav: randomPicker),
  const Choice(title: 'Group Maker', icon: Icons.group_add, nav: groupMaker),
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          onTap: () {
            Navigator.pushNamed(context, choice.nav);
          },
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child:
                        Icon(choice.icon, size: 90.0, color: textStyle.color),
                  ),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Router {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case assignTasks:
        return MaterialPageRoute(builder: (_) => AssignTasks());
      case attendance:
        return MaterialPageRoute(builder: (_) => Attendance());
      case gradeBook:
        return MaterialPageRoute(builder: (_) => GradeBook());
      case groupMaker:
        return MaterialPageRoute(builder: (_) => GroupMaker());
            default:
        return MaterialPageRoute(
            builder: (_) => Scaffold(
                  body: Center(
                      child: Text('No route defined for ${settings.name}')),
                ));
    }
  }
}

//Dynamic Routes for generating navigation
const String assignTasks = AssignTasks.id;
const String attendance = ProfileForm.id;
const String gradeBook = ClassProfile.id;
const String groupMaker = GroupMaker.id;

类选择{
常量选择（{this.title，this.icon，this.nav}）；
最后的字符串标题；
最终的Iconda图标；
最终字符串导航；
}
常量列表选项=常量[
常量选择（标题：“计时器”，图标：Icons.Timer，导航：Timer），
常数选择(
标题：“座位图”，图标：Icons.event_座位，导航：座位图），
常量选择（标题：“随机”，图标：Icons.shuffle，导航：randomPicker），
const选项（标题：“groupMaker”，图标：Icons.Group_add，导航：groupMaker），
];

选择卡片类：

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final Navigator nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: Navigator.pushNamed(context, TestConfirmation.id)),
  const Choice(title: 'Seating Chart', icon: Icons.event_seat),
  const Choice(title: 'Random', icon: Icons.shuffle),
  const Choice(title: 'Group Maker', icon: Icons.group_add),
  const Choice(title: 'Noise Monitor', icon: Icons.hearing),
  const Choice(title: 'Assign Tasks', icon: Icons.assignment_ind),
  const Choice(title: 'Survey', icon: Icons.rate_review),
  const Choice(title: 'Permission Slips', icon: Icons.assignment),
  const Choice(title: 'Lesson Plans', icon: Icons.local_library),
  const Choice(title: 'Attendance', icon: Icons.schedule),
  const Choice(title: 'Gradebook', icon: Icons.insert_chart)
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          //onTap: choice.navigation,
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                      child: Icon(choice.icon,
                          size: 90.0, color: textStyle.color)),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Choice {
  const Choice({this.title, this.icon, this.nav});
  final String title;
  final IconData icon;
  final String nav;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Timer', icon: Icons.timer, nav: timer),
  const Choice(
      title: 'Seating Chart', icon: Icons.event_seat, nav: seatingChart),
  const Choice(title: 'Random', icon: Icons.shuffle, nav: randomPicker),
  const Choice(title: 'Group Maker', icon: Icons.group_add, nav: groupMaker),
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.subhead;
    return Card(
        color: Colors.white,
        child: InkWell(
          onTap: () {
            Navigator.pushNamed(context, choice.nav);
          },
          child: Center(
            child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child:
                        Icon(choice.icon, size: 90.0, color: textStyle.color),
                  ),
                  Text(choice.title, style: textStyle),
                ]),
          ),
        ));
  }
}

class Router {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case assignTasks:
        return MaterialPageRoute(builder: (_) => AssignTasks());
      case attendance:
        return MaterialPageRoute(builder: (_) => Attendance());
      case gradeBook:
        return MaterialPageRoute(builder: (_) => GradeBook());
      case groupMaker:
        return MaterialPageRoute(builder: (_) => GroupMaker());
            default:
        return MaterialPageRoute(
            builder: (_) => Scaffold(
                  body: Center(
                      child: Text('No route defined for ${settings.name}')),
                ));
    }
  }
}

//Dynamic Routes for generating navigation
const String assignTasks = AssignTasks.id;
const String attendance = ProfileForm.id;
const String gradeBook = ClassProfile.id;
const String groupMaker = GroupMaker.id;

类选择卡扩展