flutter_firestore_tut

.\lib\scr\home.dart

//...
class _Home extends State<StatefulWidget> {
  //...
  void clickEdit(item) {
    _myUpdateContr.text = item['text'];
    showDialog(
        context: context,
        builder: (_) => SimpleDialog(
              title: Text('Edit text'),
              children: <Widget>[
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Row(
                    children: <Widget>[
                      Expanded(
                        child: TextField(
                          controller: _myUpdateContr,
                          decoration: InputDecoration(
                              border: InputBorder.none,
                              hintText: 'Enter new Text!'),
                        ),
                      ),
                      RaisedButton(
                        color: Colors.orange,
                        textColor: Colors.white,
                        splashColor: Colors.orangeAccent,
                        child: const Text('Update'),
                        onPressed: () {
                          clickUpdate(item);
                        },
                      ),
                    ],
                  ),
                ),
              ],
            ));
  }  
  //...
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      //...
    );
  }
}