Fetch Text from TextWidget flutter - flutter

Question

I am creating an weather app in which I am providing a location string to a TextField and fetch the text inside in it. I know I can do it if I use TextField widget every time, but I want to use code reusability and that's why I have created a different Widget called TextFieldWidget in which I am providing a hint variable, which returns the Text inside it. I don't know how to do return the text. This is my code.
import 'package:flutter/material.dart';
class TextFieldWidget extends StatefulWidget {
final String _hint;
TextFieldWidget(this._hint);
#override
_TextFieldWidgetState createState() => _TextFieldWidgetState();
}
class _TextFieldWidgetState extends State<TextFieldWidget> {
TextEditingController _textEditingController;
InputDecoration _inputdecoration;
#override
void initState() {
super.initState();
_textEditingController = TextEditingController();
_inputdecoration = InputDecoration(hintText: widget._hint,floatingLabelBehavior: FloatingLabelBehavior.always);
}
#override
Widget build(BuildContext context) {
return TextField(
autocorrect: true,
controller: _textEditingController,
keyboardType: TextInputType.text,
enableSuggestions: true,
decoration: _inputdecoration,
onSubmitted: (value){
// somehow return data
// I want to access this part..
},
);
}
}

Answer 1

1. You have to create one method inside calling class
void _setTextValue(String value) {
// Submitted text should appear here from value
}
TextFieldWidget(_setTextValue)
2. Use this inside TextFormField then
final Function _setValue;
TextFieldWidget(this._setValue);
3. Inside onSubmitted Call
widget._setValue(value);
Finally, you will get value inside calling class
Edited:
We can add callbacks in calling widgets itself with named parameters which is correct way of doing this
Example:
class _TextFieldWidgetState extends State<TextFieldWidget> {
TextEditingController _textEditingController;
InputDecoration _inputdecoration;
#override
void initState() {
super.initState();
_textEditingController = TextEditingController();
_inputdecoration = InputDecoration(hintText: 'UserName',floatingLabelBehavior: FloatingLabelBehavior.always);
}
#override
Widget build(BuildContext context) {
return TextField(
autocorrect: true,
controller: _textEditingController,
keyboardType: TextInputType.text,
enableSuggestions: true,
decoration: _inputdecoration,
onSubmitted: (value){
widget.getUserName(value);
// somehow return data
// I want to access this part..
},
);
}
}
Call above code like
TextFieldWidget(getUserName: (value) {
// Get the username here
print(value);
}),
Note: We can add as many as named parameter like this