tsacdop-podcast-app-android/lib/podcasts/podcastmanage.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:provider/provider.dart';
import 'package:tsacdop/class/podcast_group.dart';
import 'package:tsacdop/podcasts/podcastgroup.dart';
import 'package:tsacdop/podcasts/podcastlist.dart';
import 'package:tsacdop/util/pageroute.dart';

class PodcastManage extends StatefulWidget {
  @override
  _PodcastManageState createState() => _PodcastManageState();
}

class _PodcastManageState extends State<PodcastManage> {
  Decoration getIndicator() {
    return const UnderlineTabIndicator(
        borderSide: BorderSide(color: Colors.red, width: 0),
        insets: EdgeInsets.only(
          top: 10.0,
        ));
  }

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: SystemUiOverlayStyle(
        statusBarIconBrightness: Theme.of(context).accentColorBrightness,
        systemNavigationBarColor: Theme.of(context).primaryColor,
        statusBarColor: Theme.of(context).primaryColor,
      ),
      child: SafeArea(
        child: Scaffold(
          appBar: AppBar(
            centerTitle: true,
            title: Text('Groups'),
            actions: <Widget>[
              IconButton(
                  onPressed: () => showDialog(
                      context: context,
                      builder: (BuildContext context) => AddGroup()),
                  icon: Icon(Icons.add)),
              OrderMenu(),
            ],
          ),
          body: Consumer<GroupList>(builder: (_, groupList, __) {
            bool _isLoading = groupList.isLoading;
            List<PodcastGroup> _groups = groupList.groups;
            return _isLoading
                ? Center()
                : DefaultTabController(
                    length: _groups.length,
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.start,
                      mainAxisSize: MainAxisSize.min,
                      children: <Widget>[
                        Container(
                          height: 50,
                          padding: EdgeInsets.symmetric(horizontal: 10.0),
                          alignment: Alignment.centerLeft,
                          child: TabBar(
                            // labelColor: Colors.black,
                            //  unselectedLabelColor: Colors.grey[500],
                            labelPadding: EdgeInsets.all(5.0),
                            indicator: getIndicator(),
                            isScrollable: true,
                            tabs: _groups.map<Tab>((group) {
                              return Tab(
                                child: Container(
                                    height: 30.0,
                                    padding:
                                        EdgeInsets.symmetric(horizontal: 10.0),
                                    alignment: Alignment.center,
                                    decoration: BoxDecoration(
                                      color: Theme.of(context).brightness ==
                                              Brightness.light
                                          ? Theme.of(context).primaryColorDark
                                          : Colors.grey[800],
                                      borderRadius:
                                          BorderRadius.all(Radius.circular(15)),
                                    ),
                                    child: Text(
                                      group.name,
                                    )),
                              );
                            }).toList(),
                          ),
                        ),
                        Expanded(
                          child: Container(
                            child: TabBarView(
                              children: _groups.map<Widget>((group) {
                                return Container(
                                    key: ObjectKey(group),
                                    child: PodcastGroupList(group: group));
                              }).toList(),
                            ),
                          ),
                        )
                      ],
                    ));
          }),
        ),
      ),
    );
  }
}

class OrderMenu extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return PopupMenuButton(
      elevation: 3,
      tooltip: 'Menu',
      itemBuilder: (context) => [
        PopupMenuItem(
          value: 1,
          child: Text('All Podcasts'),
        ),
        PopupMenuItem(
          value: 2,
          child: Text('New group'),
        )
      ],
      onSelected: (value) {
        if (value == 1) {
          Navigator.push(context, ScaleRoute(page: PodcastList()));
        }
        if (value == 2) {
          showDialog(
              context: context, builder: (BuildContext context) => AddGroup());
        }
      },
    );
  }
}

class AddGroup extends StatefulWidget {
  @override
  _AddGroupState createState() => _AddGroupState();
}

class _AddGroupState extends State<AddGroup> {
  TextEditingController _controller;
  String _newGroup;
  int _error;

  @override
  void initState() {
    super.initState();
    _error = 0;
    _controller = TextEditingController();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    var groupList = Provider.of<GroupList>(context);
    List list = groupList.groups.map((e) => e.name).toList();
    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: SystemUiOverlayStyle(
        systemNavigationBarColor: Colors.black.withOpacity(0.5),
        statusBarColor: Colors.red,
      ),
      child: AlertDialog(
        elevation: 1,
        contentPadding: EdgeInsets.symmetric(horizontal: 20),
        titlePadding: EdgeInsets.only(top: 20, left: 20, right: 20, bottom: 20),
        actionsPadding: EdgeInsets.all(0),
        actions: <Widget>[
          FlatButton(
            onPressed: () => Navigator.of(context).pop(),
            child: Text(
              'CANCEL',
              style: TextStyle(color: Colors.grey[600]),
            ),
          ),
          FlatButton(
            onPressed: () async {
              if (list.contains(_newGroup)) {
                setState(() => _error = 1);
              } else {
                groupList.addGroup(PodcastGroup(_newGroup));
                Navigator.of(context).pop();
              }
            },
            child: Text('DONE'),
          )
        ],
        title: Text('Create new group'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            TextField(
              decoration: InputDecoration(
                contentPadding: EdgeInsets.symmetric(horizontal: 10),
                hintText: 'New Group',
                hintStyle: TextStyle(fontSize: 18),
                filled: true,
                focusedBorder: UnderlineInputBorder(
                  borderSide: BorderSide(color: Colors.blue, width: 2.0),
                ),
                enabledBorder: UnderlineInputBorder(
                  borderSide: BorderSide(color: Colors.blue, width: 2.0),
                ),
              ),
              cursorRadius: Radius.circular(2),
              autofocus: true,
              maxLines: 1,
              controller: _controller,
              onChanged: (value) {
                _newGroup = value;
              },
            ),
            Container(
              alignment: Alignment.centerLeft,
              child: (_error == 1)
                  ? Text(
                      'Group existed',
                      style: TextStyle(color: Colors.red[400]),
                    )
                  : Center(),
            ),
          ],
        ),
      ),
    );
  }
}