How to style this kind of Text Field - flutter

Question

I want to style this kind of TextField.
The main problem that I'm facing is to design the US$ part in leading the TextField. This is my code so far.
/// My Place Bid Text Field
Container(
decoration: BoxDecoration(
border: Border.all(color: Colors.grey),
borderRadius: BorderRadius.circular(4),
),
child: Row(
mainAxisSize: MainAxisSize.max,
children: [
SizedBox(
child: Container(
//width: mySize.width * 0.2,
//height: 50,
padding: const EdgeInsets.all(8),
decoration: BoxDecoration(
border: Border.all(color: Colors.grey),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(4),
bottomLeft: Radius.circular(4),
),
color: Colors.grey[200]),
child: Text(
"RS \u20B9",
style: TextStyle(fontSize: 24),
),
),
),
Expanded(
child: TextField(
decoration: InputDecoration(
border: InputBorder.none,
labelText: "Place Bid",
labelStyle: TextStyle(fontSize: 24)),
),
),
],
),
),
Which gives me output
I know this question is not that complicated, but I'm still relatively new to flutter so your help would be much appreciated.

Answer 1

#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Sample"),
),
body: Padding(
padding: EdgeInsets.all(10),
child: Container(
decoration: BoxDecoration(
border: Border.all(
color: Colors.grey[500],
),
borderRadius: BorderRadius.all(Radius.circular(8))),
width: double.infinity,
height: 50,
child: Row(
children: <Widget>[
Container(
padding: EdgeInsets.all(10),
color: Colors.grey.shade300,
height: 50,
child: Align(
alignment: Alignment.center,
child: Text(
"RS \u20B9",
style: TextStyle(
fontSize: 24, fontWeight: FontWeight.bold),
),
)),
SizedBox(
width: 10,
),
Expanded(
child: Container(
height: 50,
child: TextField(
decoration: InputDecoration(
border: InputBorder.none,
hintText: "Enter Bid",
labelStyle: TextStyle(fontSize: 24)),
)))
],
),
),
));
}
Output

Answer 2

You can use the prefixIcon to add a widget at the beginning of the textfield:
Container(
child: Row(
children: [
Expanded(
child: TextField(
decoration: InputDecoration(
prefixIcon: Padding(
padding: const EdgeInsetsDirectional.only(start: 2.0),
child: Container(
padding: const EdgeInsets.all(13),
decoration: BoxDecoration(
border: Border.all(color: Colors.grey),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(4),
bottomLeft: Radius.circular(4),
),
color: Colors.grey[200]),
child: Text(
"RS \u20B9",
style: TextStyle(fontSize: 24),
),
),
),
border: const OutlineInputBorder(),
labelText: 'Hint Text',
),
),
),
],
),
)
example:
https://dartpad.dev/a89aff20d67e2cb31da6a07ba7c17910

Answer 3

Based on your solution.
Notice the "IntrinsicHeight" widget. It makes all the children inside the child the same size (depending on the biggest one). The "Center" widget inside the prefix makes the Container go max height + center the text inside of it. Just make sure not to use IntrinsicHeight too much, since the docs state that it's a bit resource heavy.
Container(
width: double.infinity,
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(10.0),
border: Border.all(color: Colors.grey[200]),
),
child: IntrinsicHeight(
child: Row(
children: <Widget>[
Container(
padding: EdgeInsets.symmetric(horizontal: 10.0),
decoration: BoxDecoration(
color: Colors.grey[100],
border: Border(
right: BorderSide(color: Colors.grey[200]),
),
),
child: Center(
child: Text(
'RS \u20B9',
style: TextStyle(fontSize: 24),
),
),
),
Expanded(
child: TextField(
decoration: InputDecoration(
contentPadding: EdgeInsets.symmetric(horizontal: 20.0, vertical: 10.0),
border: InputBorder.none,
labelText: "Place Bid",
),
),
),
],
),
),
),
The second code is almost the same, except there's no label after typing the text inside the TextField.
Container(
margin: EdgeInsets.symmetric(horizontal: 20.0),
width: double.infinity,
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(10.0),
border: Border.all(color: Colors.grey[200]),
),
child: IntrinsicHeight(
child: Row(
children: <Widget>[
Container(
padding: EdgeInsets.symmetric(horizontal: 10.0),
decoration: BoxDecoration(
color: Colors.grey[100],
border: Border(
right: BorderSide(color: Colors.grey[200]),
),
),
child: Center(
child: Text(
'RS \u20B9',
style: TextStyle(fontSize: 24),
),
),
),
Expanded(
child: TextField(
decoration: InputDecoration(
contentPadding: EdgeInsets.symmetric(
horizontal: 20.0,
vertical: 20.0,
),
border: InputBorder.none,
hintText: "Place Bid",
),
),
),
],
),
),
),

Answer 4

Container(
decoration: BoxDecoration(
),
child: Row(
mainAxisSize: MainAxisSize.max,
children: [
SizedBox(
child: Container(
//width: mySize.width * 0.2,
//height: 50,
padding: const EdgeInsets.all(10),
decoration: BoxDecoration(
border:Border.all(color:Colors.grey),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(4),
bottomLeft:Radius.circular(4),
),
color: Colors.grey[200]),
child: Text(
"RS \u20B9",
style: TextStyle(fontSize: 24),
),
),
),
Expanded(
child: TextField(
decoration: InputDecoration(
border: new OutlineInputBorder(
borderRadius: BorderRadius.only(
topRight: Radius.circular(4),
bottomRight:
Radius.circular(4),
),
),
isDense: true,
labelText: "Place Bid",
labelStyle:
TextStyle(fontSize:24)),
),
),
],
),
),