flutter-todos/lib/widgets/edit_dialog.dart

import 'package:flutter/material.dart';
import 'package:todo_list/i10n/localization_intl.dart';

class EditDialog extends StatelessWidget {
  final VoidCallback onSure;
  final String title;
  final String hintText;
  final String initialValue;
  final ValueChanged<String> onValueChanged;
  final TextStyle cancelTextStyle;
  final TextStyle sureTextStyle;

  const EditDialog({
    Key key,
    this.onSure,
    this.title,
    this.hintText,
    this.initialValue, this.onValueChanged, this.cancelTextStyle, this.sureTextStyle,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(title ?? ""),
      content: Form(
        autovalidate: true,
        child: TextFormField(
          initialValue: initialValue ?? "",
          validator: (text){
            if(onValueChanged != null)
            onValueChanged(text);
          },
          decoration: InputDecoration(
            hintText: hintText ?? "",
          ),
        ),
      ),
      actions: <Widget>[
        FlatButton(
          onPressed: () {
            Navigator.of(context).pop();
          },
          child: Text(
            DemoLocalizations.of(context).cancel,
            style:cancelTextStyle ?? TextStyle(color: Colors.redAccent),
          ),
        ),
        FlatButton(
          onPressed: (){
            if(onSure != null) onSure();
            Navigator.pop(context);

          },
          child: Text(DemoLocalizations.of(context).ok,
              style:sureTextStyle ?? TextStyle(color: Colors.black)),
        ),
      ],
    );
  }
}