TodoListApp flutter

TodoListApp.dart

import 'dart:math';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

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

// DTO
class TodoTask {
  final String name;
  final DateTime dateCreatedAt = DateTime.now();
  final String description =
      "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen";

  static int randomWidth() => 500 + Random().nextInt(600 - 500);

  static String imageUrl() {
    var random = randomWidth();
    print("Width = $random");
    return "https://source.unsplash.com/random/${random}x200";
  }

  TodoTask(this.name);
}
// Random image url: https://source.unsplash.com/random/600x400

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'TODO',
      home: TasksListPage(),
    );
  }
}

class TasksListPage extends StatefulWidget {
  @override
  _TasksListPageState createState() => _TasksListPageState();
}

class _TasksListPageState extends State<TasksListPage> {
  List<TodoTask> todoList = [
    TodoTask("Buy milk"),
  ];

  final taskNameController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Todo List"),
      ),
      body: Column(
        children: [
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextField(
              decoration:
                  InputDecoration.collapsed(hintText: "Enter task name"),
              controller: taskNameController,
              onSubmitted: (value) => onAddNewTaskClicked(),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(16.0),
            child: buildListView(),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: onAddNewTaskClicked,
        child: Text("Add"),
      ),
    );
  }

  void onAddNewTaskClicked() {
    setState(() => todoList.add(TodoTask(taskNameController.text)));

    taskNameController.clear();
  }

  // Tasks list
  Widget buildListView() {
    final List<Widget> listOfWidgetConvertedFromTodoTasks =
        todoList.map((TodoTask todoTask) {
      return buildListItem(todoTask);
    }).toList();

    return Container(
      height: 300,
      child: ListView(children: listOfWidgetConvertedFromTodoTasks),
    );
  }

  // Todo list item
  Widget buildListItem(TodoTask todoTask) => Card(
        child: Column(children: [
          Image.network(TodoTask.imageUrl()),
          Padding(
            padding: const EdgeInsets.all(16),
            child: Text("Task: ${todoTask.name}"),
          )
        ]),
      );
}