やりたいこと
TableCalenderというFlutterのライブラリとFirestoreを使ってカレンダーの画面を作成しています。
selectedEventを設定してしている箇所で、selectedEventに値を代入してから_buildEventList()を設定したいのですが、先に_buildEventList()は呼ばれてしまうので空の状態になってしまいます。
何か良い解決策はありますでしょうか?よろしくお願い致します。
コード
Dart
1final _firestore = Firestore.instance; 2FirebaseUser loggedInUser; 3 4// Example holidays 5final Map<DateTime, List> _holidays = { 6 DateTime(2019, 1, 1): ['New Year\'s Day'], 7 DateTime(2019, 1, 6): ['Epiphany'], 8 DateTime(2019, 2, 14): ['Valentine\'s Day'], 9 DateTime(2019, 4, 21): ['Easter Sunday'], 10 DateTime(2019, 4, 22): ['Easter Monday'], 11}; 12 13class CalenderScreen extends StatefulWidget { 14 15 _CalenderScreenState createState() => _CalenderScreenState(); 16} 17 18class _CalenderScreenState extends State<CalenderScreen> 19 with TickerProviderStateMixin { 20 DateTime _selectedDay; 21 Map<DateTime, List> _events = {}; 22 Map<DateTime, List> _visibleEvents; 23 Map<DateTime, List> _visibleHolidays; 24 List _selectedEvents; 25 AnimationController _controller; 26 final _auth = FirebaseAuth.instance; 27 Widget streamBuilder; 28 Widget buildEvents; 29 30 31 void initState() { 32 print("calender"); 33 super.initState(); 34 getCurrentUser(); 35 _selectedDay = DateTime.now(); 36 _selectedEvents = _events[_selectedDay] ?? []; 37 _visibleEvents = _events; 38 _visibleHolidays = _holidays; 39 40 _controller = AnimationController( 41 vsync: this, 42 duration: const Duration(milliseconds: 400), 43 ); 44 45 _controller.forward(); 46 } 47 48 void getCurrentUser() async { 49 try { 50 final user = await _auth.currentUser(); 51 if (user != null) { 52 loggedInUser = user; 53 setStreamBuilder(); 54 } 55 } catch (e) { 56 print(e); 57 } 58 } 59 60 void setStreamBuilder() { 61 setState(() { 62 streamBuilder = StreamBuilder<QuerySnapshot>( 63 stream: _firestore 64 .collection('users') 65 .document(loggedInUser.uid) 66 .collection('history') 67 .snapshots(), 68 builder: (context, snapshot) { 69 if (snapshot.data == null) 70 return Center(child: CircularProgressIndicator()); 71 final historys = snapshot.data.documents; 72 _events = {}; 73 for (var history in historys) { 74 DateTime timeStamp = history.data['date'].toDate(); 75 DateTime currentDate = 76 DateTime(timeStamp.year, timeStamp.month, timeStamp.day); 77 if (_events.containsKey(currentDate)) { 78 _events[currentDate].add(history); 79 } else { 80 _events[currentDate] = [history]; 81 } 82 } 83 print(_events); 84 DateTime now = DateTime.now(); 85 _selectedDay = DateTime(now.year, now.month, now.day); 86 //ここでselectedEventを設定して_selectedEventsを使ってから_buildEventList()を設定したいのですが、先に_buildEventList()は呼ばれてしまうのでからの状態になってしまいます。 87 _selectedEvents = _events[_selectedDay] ?? []; 88 _visibleEvents = _events; 89 return _buildTableCalendar(); 90 }, 91 ); 92 }); 93 } 94 95 void _onDaySelected(DateTime day, List events) { 96 setState(() { 97 _selectedDay = day; 98 _selectedEvents = events; 99 }); 100 } 101 102 void _onVisibleDaysChanged( 103 DateTime first, DateTime last, CalendarFormat format) { 104 setState(() { 105 _visibleEvents = Map.fromEntries( 106 _events.entries.where( 107 (entry) => 108 entry.key.isAfter(first.subtract(const Duration(days: 1))) && 109 entry.key.isBefore(last.add(const Duration(days: 1))), 110 ), 111 ); 112 113 _visibleHolidays = Map.fromEntries( 114 _holidays.entries.where( 115 (entry) => 116 entry.key.isAfter(first.subtract(const Duration(days: 1))) && 117 entry.key.isBefore(last.add(const Duration(days: 1))), 118 ), 119 ); 120 }); 121 } 122 123 124 Widget build(BuildContext context) { 125 return Scaffold( 126 backgroundColor: Color(0xFF232D3D), 127 body: Column( 128 mainAxisSize: MainAxisSize.max, 129 children: <Widget>[ 130 streamBuilder != null 131 ? streamBuilder 132 : Center( 133 child: CircularProgressIndicator(), 134 ), 135 const SizedBox(height: 8.0), 136 _buildEventList() 137 ], 138 ), 139 floatingActionButton: FloatingPenButton(), 140 ); 141 } 142 143 Widget _buildTableCalendar() { 144 return TableCalendar( 145 ~~ 146 ); 147 } 148 149 Widget _buildEventList() { 150 print("bulid event"); 151 return Expanded( 152 child: ListView( 153 children: _selectedEvents 154 .map( 155 (event) => HistoryCard( 156 history: HistoryData( 157 ~~ 158 ), 159 ) 160 .toList(), 161 ), 162 ); 163 } 164} 165
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