Sample GetX todo list.

getx_todo_list.dart

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

class SampleTodoDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      home: TodoPage(),
    );
  }
}

class TodoModel {
  String name;
  bool checked;
  bool isEdit = false;
  TodoModel(this.name, [this.checked = false]);
}

class TodoController extends GetxController {
  static TodoController get() {
    final gi = GetInstance();
    return gi.isRegistered<TodoController>()
        ? gi.find<TodoController>()
        : gi.put<TodoController>(TodoController());
  }

  final _list = <Rx<TodoModel>>[].obs;

  List<Rx<TodoModel>> get list => _list.value;

  void addItem() {
    final item = TodoModel('blah', false);
    _list.add(Rx<TodoModel>(item));
  }

  void editItem(Rx<TodoModel> model) {
    model.update((v) => v.isEdit = !v.isEdit);
    if (model.value.isEdit) Get.focusScope.unfocus();
  }

  void updateItemCheck(Rx<TodoModel> model, bool flag) {
    model.update((v) => v.checked = flag);
  }

  updateItemName(Rx<TodoModel> model, String str) {
    model.update((v) => v.name = str);
  }

  removeItem(Rx<TodoModel> model) {
    _list.remove(model);
  }
}

class TodoPage extends StatelessWidget {
  final controller = TodoController.get();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('todos'),
        actions: [
          IconButton(icon: Icon(Icons.add), onPressed: controller.addItem),
        ],
      ),
      body: Obx(() {
        final list = controller.list;
        if (list.isEmpty) {
          return Center(child: Text('list is empty'));
        }
        return ListView.builder(
          itemBuilder: (ctx, idx) => _buildItem(list[idx]),
          itemCount: list.length,
        );
      }),
    );
  }

  Widget _buildItem(Rx<TodoModel> rx) {
    return Obx(
      () {
        final model = rx.value;
        return ListTile(
          leading: Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              IconButton(
                icon: Icon(model.isEdit ? Icons.check : Icons.create),
                onPressed: () => controller.editItem(rx),
              ),
              if (!model.isEdit)
                IconButton(
                  icon: Icon(Icons.remove_circle),
                  onPressed: () => controller.removeItem(rx),
                ),
            ],
          ),
          title: !model.isEdit
              ? Text(model.name)
              : TextFormField(
                  initialValue: model.name,
                  autofocus: true,
                  enabled: model.isEdit,
                  onChanged: (str) => controller.updateItemName(rx, str),
                ),
          trailing: Checkbox(
            value: model.checked,
            onChanged: (flag) => controller.updateItemCheck(rx, flag),
          ),
        );
      },
    );
  }
}