Access data from custom widget created on different class in flutter - flutter

Question

I new to Flutter and i was trying to find a solution for the below issue for several hours. I have searched and every solution provided does not work form me.
I have page where one of the widgets is the autocomplete text input. I have created this autocomplete widget on different class. I have added this widget as StatefulBuilder within my main widget. it is working fine however, i am not able to access its value so I can store it with other fields.
My code look like
class ItemDetails extends StatefulWidget {
const ItemDetails({Key? key}) : super(key: key);
static const routeName = '/item_details';
#override
State<ItemDetails> createState() => _ItemDetails();
}
class _ItemDetails extends State<ItemDetails> {
late TextEditingController labelController;
late TextEditingController valueController;
late TextEditingController notesController;
bool _submitted = false;
late var args;
String _itemLabel2 = "";
// var labelAutoComp = LabelSugg();
#override
void initState() {
super.initState();
labelController = TextEditingController();
valueController = TextEditingController();
notesController = TextEditingController();
}
#override
void dispose() {
labelController.dispose();
valueController.dispose();
notesController.dispose();
// Hive.close();
super.dispose();
}
String? _labelErrorText(context) {
final text = labelController.value.text;
if (text.isEmpty) {
// return 'Can\'t be empty';
return AppLocalizations.of(context)!.noEmpty;
}
}
String? _valueErrorText(context) {
final text = valueController.value.text;
if (text.isEmpty) {
// return 'Can\'t be empty';
return AppLocalizations.of(context)!.noEmpty;
}
}
#override
Widget build(BuildContext context) {
try {
args = ModalRoute.of(context)!.settings.arguments as Map;
} on Exception catch (e) {
// print(e);
}
// print(args);
return Scaffold(
appBar: AppBar(
title: Text(args['title']),
),
body: Container(
padding: const EdgeInsets.all(20),
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.all(20),
child: Column(
// mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
LabelSugg(getLabelText: (String val) {
print(val);
_itemLabel2 = val;
}),
TextField(
autofocus: true,
decoration: InputDecoration(
labelText: AppLocalizations.of(context)!.label,
hintText: AppLocalizations.of(context)!.labelHint,
errorText:
_submitted ? _labelErrorText(context) : null,
),
controller: labelController,
onChanged: (_) => setState(() {}),
),
const SizedBox(height: 5),
TextField(
autofocus: false,
decoration: InputDecoration(
labelText: AppLocalizations.of(context)!.value,
hintText: AppLocalizations.of(context)!.valueHint,
errorText:
_submitted ? _valueErrorText(context) : null,
),
controller: valueController,
keyboardType: const TextInputType.numberWithOptions(
decimal: true, signed: false),
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.allow(
RegExp(r"[0-9.]")),
TextInputFormatter.withFunction(
(oldValue, newValue) {
try {
final text = newValue.text;
if (text.isNotEmpty) double.parse(text);
return newValue;
} catch (e) {}
return oldValue;
}),
], // Only numbers can be entered
onChanged: (_) => setState(() {}),
),
const SizedBox(height: 5),
TextField(
autofocus: true,
decoration: InputDecoration(
labelText: AppLocalizations.of(context)!.notes,
hintText: AppLocalizations.of(context)!.noteHint,
),
controller: notesController,
onChanged: (_) => setState(() {}),
),
]),
// ],
),
Expanded(
child: Align(
alignment: FractionalOffset.bottomCenter,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ElevatedButton.icon(
onPressed: () {
setState(() => _submitted = true);
if (_labelErrorText(context) == null &&
_valueErrorText(context) == null) {
//insert
var localLabel = labelController.value.text;
var _localValue = 0.0;
if (valueController.value.text != '') {
_localValue =
double.parse(valueController.value.text);
} else {
_localValue = 0.0;
}
var localNotes = notesController.value.text;
addItemToList(
localLabel, _localValue, localNotes);
Navigator.of(context).pop();
labelController.clear();
valueController.clear();
notesController.clear();
}
},
label: Text(AppLocalizations.of(context)!.add),
icon: const Icon(Icons.save, size: 18),
),
const SizedBox(width: 10),
ElevatedButton.icon(
onPressed: () => {Navigator.pop(context)},
label: Text(AppLocalizations.of(context)!.cancel),
icon: const Icon(Icons.cancel, size: 18),
),
],
)),
),
// )
],
)));
}
void addItemToList(String localLabel, double localValue, String localNotes) {
var _item = YearItems()..yearID = args['year'];
_item.itemLabel = localLabel;
_item.itemValue = localValue;
_item.itemNote = localNotes;
print(_itemLabel2);
final itemsBox = ItemsBoxes.getTransactions();
itemsBox.add(_item);
}
}
my labelAutoComp widget code look like
class LabelSugg extends StatefulWidget {
final ValueChanged<String> getLabelText;
const LabelSugg({Key? key, required this.getLabelText}) : super(key: key);
#override
State<LabelSugg> createState() => _LabelSugg();
}
class _LabelSugg extends State<LabelSugg> {
late TextEditingController fieldTextEditingController2;
#override
void initState() {
super.initState();
}
#override
void dispose() {
super.dispose();
}
getLabel() {
return widget.getLabelText(fieldTextEditingController2.text);
}
#override
Widget build(BuildContext context) {
List<LabelsAc> labelOptions = <LabelsAc>[
LabelsAc(label: AppLocalizations.of(context)!.labelClothes),
LabelsAc(label: AppLocalizations.of(context)!.labelFood),
LabelsAc(label: AppLocalizations.of(context)!.labelPerfumes),
LabelsAc(label: AppLocalizations.of(context)!.labelCapital),
];
return Autocomplete<LabelsAc>(
optionsBuilder: (TextEditingValue textEditingValue) {
return labelOptions
.where((LabelsAc _label) => _label.label
.toLowerCase()
.startsWith(textEditingValue.text.toLowerCase()))
.toList();
},
displayStringForOption: (LabelsAc option) => option.label,
fieldViewBuilder: (BuildContext context,
TextEditingController fieldTextEditingController,
// fieldTextEditingController,
FocusNode fieldFocusNode,
VoidCallback onFieldSubmitted) {
return TextField(
controller: fieldTextEditingController,
focusNode: fieldFocusNode,
style: const TextStyle(fontWeight: FontWeight.bold),
// onChanged: getLabel(),
onChanged: (String val) {
fieldTextEditingController2 = fieldTextEditingController;
getLabel();
});
},
onSelected: (LabelsAc selection) {
fieldTextEditingController2 =
TextEditingController(text: selection.label);
getLabel();
},
optionsViewBuilder: (BuildContext context,
AutocompleteOnSelected<LabelsAc> onSelected,
Iterable<LabelsAc> options) {
return Align(
alignment: Alignment.topLeft,
child: Material(
child: Container(
// width: 350,
// color: Colors.cyan,
child: ListView.builder(
padding: const EdgeInsets.all(10.0),
itemCount: options.length,
itemBuilder: (BuildContext context, int index) {
final LabelsAc option = options.elementAt(index);
return GestureDetector(
onTap: () {
onSelected(option);
},
child: ListTile(
title: Text(option.label,
style: const TextStyle(color: Colors.black)),
),
);
},
),
),
),
);
},
);
// ),
// );
}
}
class LabelsAc {
LabelsAc({required this.label});
String label;
}

Answer 1

first is redundant when you wrap your class that extend StatefullWidget with StatefullBuilder. LabelSugg is a component Widget. you can use it like other widget.
benefit to separate widget with StatefullWidget class is, we can update the value inside the class without re-build the current page. which is good for performance. that's why developer recomend to separete with class insted compared to make local method.
as you see, when you create LabelSugg extend StatefullWidget class , we will have _LabelSugg . underscore means that: all variable only accessible on current file.
thats why we can't call getLabel() or other variable from different file.
its used for handle the State in 'LabelSugg` widget.
now how to pass the value from LabelSugg is by created variable outside the state. here you are:
class LabelSugg extends StatefulWidget {
// use this to pass any changes when we use LabelSugg
final ValueChanged<String> getLabelText;
const LabelSugg({Key? key, required this.getLabelText}) : super(key: key);
#override
State<LabelSugg> createState() => _LabelSugg();
}
then we can call the onChaged inside _LabelSugg state. because its Statefull widget, we can acces by : widget.getLabelText()
class _LabelSugg extends State<LabelSugg> {
late TextEditingController fieldTextEditingController;
.....
getLabel() {
return widget.getLabelText(fieldTextEditingController.text);
}
then in other class we call LabelSugg like common widget
import 'package:../labelsug.dart';
class ItemDetails extends StatefulWidget {
.....
return Scaffold(
appBar: AppBar(
title: Text(args['title']),
),
body: Container(
padding: const EdgeInsets.all(20),
child: Column(
children: <Widget>[
// now use it like a widget
LabelSug(
getLabelText: (String val){
print(val);
}
:)