UniqueKey test

main.dart

import 'package:flutter/material.dart';

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

class SomeObject {
  final String title;

  const SomeObject(this.title);
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  static const uniqueObjects = [
    SomeObject('1'),
    SomeObject('2'),
    SomeObject('3'),
    SomeObject('4'),
  ];

  static final initialObjectsForView = [
    uniqueObjects[0],
    uniqueObjects[1],
    uniqueObjects[1],
    uniqueObjects[2],
    uniqueObjects[2],
    uniqueObjects[2],
    uniqueObjects[3],
    uniqueObjects[3],
    uniqueObjects[3],
    uniqueObjects[3],
  ];

  late final Map<Key, SomeObject> mapObjectsForView = {
    for (final obj in initialObjectsForView) UniqueKey(): obj,
  };

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(title: const Text('Some objects')),
        body: Center(
          child: Column(
            children: [
              for (final MapEntry(:key, :value) in mapObjectsForView.entries)
                ElevatedButton(
                  key: key,
                  onPressed: () {
                    setState(() {
                      mapObjectsForView.remove(key);
                    });
                  },
                  child: Text('${value.title} @ ${key.hashCode}'),
                )
            ],
          ),
        ),
      ),
    );
  }
}