首先，我希望您在这个全球困难重重的时期一切顺利。我正在重构屏幕代码的一部分，并且对此感到困惑。
我有一个底部的模式表，我将其提取到一个单独的文件中，以使MapScreen UI代码简短明了，但是出了点问题。我得到的错误是BlocProvider.of() called with a context that does not contain a Bloc of type TrackingBloc.我必须在单独文件中声明BlocProvider的那些人吗？它不是通过context:context参数传递给窗口小部件吗？然后，我尝试添加它，但仍然收到错误。你能发现我在做什么错吗？
一如既往，非常感谢您的时间和帮助，尤其是在这个非常困难的时期。
UI模式底部表格：
showModalBottomSheet(
isScrollControlled: true,
context: context,
builder: (modal) {
// return AndroidTrackingSheet(routeName,
// isTracking, _textEditingController);
return Container(
color: Color(0xff757575),
child: SingleChildScrollView(
child: Container(
padding: EdgeInsets.only(
left: 20,
right: 20,
bottom: MediaQuery.of(modal)
.viewInsets
.bottom),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(
Radius.circular(20)),
),
child: Center(
child: Column(
// mainAxisAlignment:
// MainAxisAlignment.center,
crossAxisAlignment:
CrossAxisAlignment.stretch,
children: <Widget>[
SizedBox(
height: 10,
),
Text(
'Nuovo percorso',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 25,
color: Colors.orangeAccent,
fontWeight: FontWeight.w400,
),
),
SizedBox(
height: 10,
),
Text(
'Inserisci un nome per il tuo nuovo percorso, e scegli Inizia tracking. Quando sarai arrivato a destinazione premi di nuovo il bottone Tracking e scegli Fine tracking.',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 18,
color: Colors.black,
fontWeight: FontWeight.w400),
),
SizedBox(
height: 10,
),
TextField(
controller:
_textEditingController,
autofocus: true,
textAlign: TextAlign.center,
showCursor: true,
decoration: InputDecoration(
hintText: isTracking
? routeName
: 'nome percorso',
labelStyle: TextStyle(
fontSize: 18,
color: Colors.black,
fontWeight:
FontWeight.w100),
border: OutlineInputBorder(),
// focusColor:
// Colors.lightGreenAccent,
focusedBorder:
OutlineInputBorder(
borderSide: BorderSide(
color: Colors.orange,
width: 1,
),
),
),
),
SizedBox(
height: 10,
),
FlatButton(
color: Colors.orangeAccent,
child: Text(
isTracking
? "Fine tracking"
: 'Inizia tracking',
style: TextStyle(
fontSize: 18,
color: Colors.white),
),
onPressed: () {
print(
"Action 2 is been clicked");
routeName =
_textEditingController.text;
Navigator.pop(context);
isTracking = !isTracking;
BlocProvider.of<TrackingBloc>(
context)
.add(StartStopTracking());
},
),
SizedBox(
height: 10,
),
FlatButton(
color: Colors.redAccent,
child: Text(
'Cancella',
style: TextStyle(
fontSize: 18,
color: Colors.white),
),
onPressed: () {
Navigator.pop(context);
},
),
SizedBox(
height: 10,
),
],
),
),
),
),
);
});
单独的小部件模式表：
class AndroidTrackingSheet extends StatelessWidget {
TextEditingController _textEditingController;
bool isTracking;
String routeName;
AndroidTrackingSheet(
this.routeName, this.isTracking, this._textEditingController);
@override
Widget build(BuildContext context) {
return Container(
color: Color(0xff757575),
child: SingleChildScrollView(
child: Container(
padding: EdgeInsets.only(
left: 20,
right: 20,
bottom: MediaQuery.of(context).viewInsets.bottom),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(20)),
),
child: Center(
child: Column(
// mainAxisAlignment:
// MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
SizedBox(
height: 10,
),
Text(
'Nuovo percorso',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 25,
color: Colors.orangeAccent,
fontWeight: FontWeight.w400,
),
),
SizedBox(
height: 10,
),
Text(
'Inserisci un nome per il tuo nuovo percorso, e scegli Inizia tracking. Quando sarai arrivato a destinazione premi di nuovo il bottone Tracking e scegli Fine tracking.',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 18,
color: Colors.black,
fontWeight: FontWeight.w400),
),
SizedBox(
height: 10,
),
TextField(
controller: _textEditingController,
autofocus: true,
textAlign: TextAlign.center,
showCursor: true,
decoration: InputDecoration(
hintText: isTracking ? routeName : 'nome percorso',
labelStyle: TextStyle(
fontSize: 18,
color: Colors.black,
fontWeight: FontWeight.w100),
border: OutlineInputBorder(),
// focusColor:
// Colors.lightGreenAccent,
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(
color: Colors.orange,
width: 1,
),
),
),
),
SizedBox(
height: 10,
),
FlatButton(
color: Colors.orangeAccent,
child: Text(
isTracking ? "Fine tracking" : 'Inizia tracking',
style: TextStyle(fontSize: 18, color: Colors.white),
),
onPressed: () {
print("Action 2 is been clicked");
routeName = _textEditingController.text;
Navigator.pop(context);
isTracking = !isTracking;
BlocProvider.of<TrackingBloc>(context)
.add(StartStopTracking());
},
),
SizedBox(
height: 10,
),
FlatButton(
color: Colors.orangeAccent,
child: Text(
'Cancella',
style: TextStyle(fontSize: 18, color: Colors.white),
),
onPressed: () {
Navigator.pop(context);
},
),
SizedBox(
height: 10,
),
],
),
),
),
),
);
}
}
使用bloc提供程序分隔底页：
class AndroidTrackingBottomSheet extends StatelessWidget {
TextEditingController _textEditingController;
bool isTracking;
String routeName;
AndroidTrackingBottomSheet(
this.routeName, this.isTracking, this._textEditingController);
@override
Widget build(BuildContext context) {
return BlocProvider<TrackingBloc>(
create: (context) => TrackingBloc(),
child: Container(
color: Color(0xff757575),
child: SingleChildScrollView(
child: Container(
padding: EdgeInsets.only(
left: 20,
right: 20,
bottom: MediaQuery.of(context).viewInsets.bottom),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(20)),
),
child: Center(
child: Column(
// mainAxisAlignment:
// MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
SizedBox(
height: 10,
),
Text(
'Nuovo percorso',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 25,
color: Colors.orangeAccent,
fontWeight: FontWeight.w400,
),
),
SizedBox(
height: 10,
),
Text(
'Inserisci un nome per il tuo nuovo percorso, e scegli Inizia tracking. Quando sarai arrivato a destinazione premi di nuovo il bottone Tracking e scegli Fine tracking.',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 18,
color: Colors.black,
fontWeight: FontWeight.w400),
),
SizedBox(
height: 10,
),
TextField(
controller: _textEditingController,
autofocus: true,
textAlign: TextAlign.center,
showCursor: true,
decoration: InputDecoration(
hintText: isTracking ? routeName : 'nome percorso',
labelStyle: TextStyle(
fontSize: 18,
color: Colors.black,
fontWeight: FontWeight.w100),
border: OutlineInputBorder(),
// focusColor:
// Colors.lightGreenAccent,
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(
color: Colors.orange,
width: 1,
),
),
),
),
SizedBox(
height: 10,
),
FlatButton(
color: Colors.orangeAccent,
child: Text(
isTracking ? "Fine tracking" : 'Inizia tracking',
style: TextStyle(fontSize: 18, color: Colors.white),
),
onPressed: () {
print("Action 2 is been clicked");
routeName = _textEditingController.text;
Navigator.pop(context);
isTracking = !isTracking;
BlocProvider.of<TrackingBloc>(context)
.add(StartStopTracking());
},
),
SizedBox(
height: 10,
),
FlatButton(
color: Colors.orangeAccent,
child: Text(
'Cancella',
style: TextStyle(fontSize: 18, color: Colors.white),
),
onPressed: () {
Navigator.pop(context);
},
),
SizedBox(
height: 10,
),
],
),
),
),
),
),
);
}
}
答案 0 :(得分：0)
我终于发现，必须通过BlocProvider.value将Bloc提供给底层，而不是在小部件文件中，因此工作代码是：
showModalBottomSheet(
isScrollControlled: true,
context: context,
builder: (modal) {
return BlocProvider.value(
value: BlocProvider.of<TrackingBloc>(context),
child: AndroidTrackingBottomSheet(
widget.key,
routeName,
isTracking,
_textEditingController),
);