How to transfer textfield's label to top of prefix Icon instead of text

Issue

In flutter’s textField when we use prefixIcon and label, in focus mode label’s animation transfers to the top of the text (not to the top of the icon).
I don’t want to use prefix instead of prefixIcon because prefix hides when textField is not on focus mode. I need my prefix always visible.
Like these images from material designs text fields part:
enter image description here
enter image description here

Solution

Although there are some fix position value,
here is my implementation,

enter image description here

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      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> {
  FocusNode _focusNode = FocusNode();
  bool textEditHasFocus = false;
  @override
  void initState() {
    super.initState();
    _focusNode.addListener(() {
      setState(() {
        textEditHasFocus = _focusNode.hasFocus;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: _buildBody(),
      floatingActionButton: FloatingActionButton(
        onPressed: () {},
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }

  Widget _buildBody() {
    return Container(
      decoration: BoxDecoration(color: Colors.white),
      padding: new EdgeInsets.symmetric(
        vertical: 40.0,
        horizontal: 20,
      ),
      child: Stack(
        clipBehavior: Clip.none,
        children: <Widget>[
          Container(
            child: TextField(
              focusNode: _focusNode,
              decoration: InputDecoration(
                // hintText: textEditHasFocus ? '' : 'Label',
                // hintStyle: TextStyle(
                //   color: Colors.grey,
                // ),
                border: OutlineInputBorder(),
                focusedBorder: OutlineInputBorder(),
                contentPadding: EdgeInsets.only(left: 40),
              ),
            ),
          ),
          AnimatedPositioned(
            duration: Duration(milliseconds: 200),
            left: textEditHasFocus ? 10 : 40,
            top: textEditHasFocus ? -10 : 13,
            child: InkWell(
              onTap: () {
                _focusNode.requestFocus();
              },
              child: Container(
                padding: EdgeInsets.only(left: 3),
                color: Colors.white,
                child: Text('Label'),
              ),
            ),
          ),
          Positioned.fill(
            child: Align(
              alignment: Alignment.centerLeft,
              child: Container(
                padding: EdgeInsets.only(left: 10),
                color: Colors.transparent,
                child: Icon(Icons.favorite),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

Answered By – KuKu

Answer Checked By – Senaida (FlutterFixes Volunteer)

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