TextField Cursor Position Flutter WEB - flutter

Question

What this code does is print the position of the cursor in the text when you click on it.
TextEditingController controller = TextEditingController();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
widget.title,
),
),
body: TextField(
controller: controller,
keyboardType: TextInputType.multiline,
maxLines: null,
onTap: () {
int pos = controller.selection.start;
print(
"Position: $pos",
);
},
),
);
}
But the problem is that this is for web so I need it to say the position of the cursor whenever it moves not only when I tap on it.
I mean if you move the cursor with the keyboard it should also print the position.
I already tried with GestureDetector and Focus and nothing. Any idea what I can use?
UPDATE:
The solution I found was the following and it works perfectly, for what I need:
TextEditingController controller = TextEditingController();
int cursorPosition = 0;
#override
void initState() {
controller.addListener(() {
setState(() {
cursorPosition = controller.selection.base.offset;
print("cursorPosition: $cursorPosition");
});
});
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
widget.title,
),
),
body: TextField(
controller: controller,
keyboardType: TextInputType.multiline,
maxLines: null,
),
);
}
Full Code:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
TextEditingController controller = TextEditingController();
int cursorPosition = 0;
#override
void initState() {
controller.addListener(() {
setState(() {
cursorPosition = controller.selection.base.offset;
print("cursorPosition: $cursorPosition");
});
});
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
widget.title,
),
),
body: TextField(
controller: controller,
keyboardType: TextInputType.multiline,
maxLines: null,
),
);
}
}

Answer 1

The solution I found was the following and it works perfectly, for what I need:
TextEditingController controller = TextEditingController();
int cursorPosition = 0;
#override
void initState() {
controller.addListener(() {
setState(() {
cursorPosition = controller.selection.base.offset;
print("cursorPosition: $cursorPosition");
});
});
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
widget.title,
),
),
body: TextField(
controller: controller,
keyboardType: TextInputType.multiline,
maxLines: null,
),
);
}
Full Code:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
TextEditingController controller = TextEditingController();
int cursorPosition = 0;
#override
void initState() {
controller.addListener(() {
setState(() {
cursorPosition = controller.selection.base.offset;
print("cursorPosition: $cursorPosition");
});
});
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
widget.title,
),
),
body: TextField(
controller: controller,
keyboardType: TextInputType.multiline,
maxLines: null,
),
);
}
}

Answer 2

onChanged: (value) {
int pos = controller.selection.start;
print(
"Position: $pos",
);
},