我正在研究某些数据的CRUD功能，其中有一个数据列表，我们可以从中选择一个数据并进行更新。我的问题是我无法访问可以完成更新的小部件中的单个数据列表。我有相同的小部件，用于bot添加和更新数据。每当我选择“编辑”按钮时，“添加”小部件都应在文本格式字段中填充相应的数据。我是这项技术的新手，对这项工作有些困惑。 任何帮助表示赞赏。等待回应。
view page
build method
return Scaffold(
appBar: AppBar(
iconTheme: IconThemeData(
color: Theme.of(context).primaryColor,
),
backgroundColor: Theme.of(context).canvasColor,
titleSpacing: 0.0,
title: Text(
widget._member.firstName.substring(0, 1).toUpperCase() +
widget._member.firstName.substring(1) +
' ' +
widget._member.lastName.substring(0, 1).toUpperCase() +
widget._member.lastName.substring(1),
style: TextStyle(
fontSize: 16.0,
fontWeight: FontWeight.w800,
color: Theme.of(context).primaryColor),
textAlign: TextAlign.left,
),
),
body: ScopedModelDescendant(
builder: (BuildContext context, Widget child, MainModel model) {
return SingleChildScrollView(
child: Container(
padding: EdgeInsets.all(10.0),
child: Card(
color: Color(0xffF7F7F7),
child: Column(
children: <Widget>[
Container(
padding: EdgeInsets.all(10.0),
width: MediaQuery.of(context).size.width,
child: Form(
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.all(5.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Expanded(
child: Text(
_addNewNote ? 'Notes' : 'Add New Note',
style:
Theme.of(context).textTheme.body1,
),
),
Align(
child: FlatButton(
child: Text(
_addNewNote
? '+ Add New Note'
: 'Cancel',
style: TextStyle(
fontSize: 14.0,
color: Theme.of(context)
.primaryColor)),
onPressed: () {
setState(
() => _addNewNote = !_addNewNote);
},
),
)
],
),
),
Container(
child: _addNewNote
? _buildListNoteSection(model)
: _buildAddNewNoteSection(model, model.memberNotes)
),
],
),
),
),
buildListNoteSection
Widget _buildListNoteSection(MainModel model) {
return Container(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height * 0.3,
child: ListView.builder(
itemBuilder: (BuildContext context, int index) {
return _listMemberNote(model.memberNotes[index], model);
},
itemExtent: 200.0,
itemCount: model.memberNotes.length,
),
);
}
buildAddNewNoteSection
Widget _buildAddNewNoteSection(MainModel model, memberNote) {
return Form(
key: _formKey,
child: Column(
children: <Widget>[
TextFormField(
style: TextStyle(fontSize: 16.0),
decoration: InputDecoration(
labelText: 'Subject / Title',
contentPadding: EdgeInsets.all(10.0),
filled: true,
fillColor: Theme.of(context).canvasColor,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(10.0),
),
),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
borderSide: BorderSide(
color: Theme.of(context).canvasColor, width: 2.0),
),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
borderSide: BorderSide(
color: Theme.of(context).canvasColor, width: 2.0),
),
errorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
borderSide: BorderSide(color: Colors.red, width: 2.0),
),
focusedErrorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
borderSide: BorderSide(color: Colors.red, width: 2.0),
),
),
validator: (String value) {
if (value.isEmpty) {
return 'Title field is required';
}
},
onSaved: (String value) {
_noteTitle = value;
},
),
SizedBox(
height: 10.0,
),
TextFormField(
maxLines: 4,
style: TextStyle(fontSize: 16.0),
decoration: InputDecoration(
labelText: 'Note',
contentPadding: EdgeInsets.all(10.0),
filled: true,
fillColor: Theme.of(context).canvasColor,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(10.0),
),
),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
borderSide: BorderSide(
color: Theme.of(context).canvasColor, width: 2.0),
),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
borderSide: BorderSide(
color: Theme.of(context).canvasColor, width: 2.0),
),
errorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
borderSide: BorderSide(color: Colors.red, width: 2.0),
),
focusedErrorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
borderSide: BorderSide(color: Colors.red, width: 2.0),
),
),
validator: (String value) {
if (value.isEmpty) {
return 'Description field is required';
}
},
onSaved: (String value) {
_noteDescription = value;
},
),
SizedBox(
height: 10.0,
),
ScopedModelDescendant(
builder: (BuildContext context, Widget child, MainModel model) {
return ButtonTheme(
minWidth: 400.0,
height: 50.0,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(7.0)),
child: RaisedButton(
child: Text(
'Save',
style: Theme.of(context).textTheme.headline,
),
color: Theme.of(context).buttonColor,
textColor: Theme.of(context).canvasColor,
onPressed: () {
if (!_formKey.currentState.validate()) {
return;
}
_formKey.currentState.save();
MemberController.addMemberNote(widget._member.memberId,
_noteTitle, _noteDescription, model)
.then((value) {
if (value['success']) {
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text(''),
content: Text(value['message']),
actions: <Widget>[
FlatButton(
child: Text('Okay'),
onPressed: () {
setState(() => _addNewNote = !_addNewNote);
Navigator.of(context).pop();
MemberController.fetchMemberNoteList(model, widget._member.memberId.toString());
},
),
],
);
});
} else {
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text('An Error Occured!'),
content: Text(value['message']),
actions: <Widget>[
FlatButton(
child: Text('Okay'),
onPressed: () {
Navigator.of(context).pop();
},
),
],
);
});
}
});
},
),
);
},
)
],
),
);
}
我希望当我们单击编辑链接时，“添加”小部件应填充相应的数据并可以更新。