I'm starting to program now and I'm having trouble changing the value of an observable variable, I was wondering if you could help me as it has no syntax errors but still only takes the value assigned to the initializer

Variable call location

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:get/get_state_manager/src/rx_flutter/rx_obx_widget.dart';
import 'package:project001_app_waiter/config/custom_colors.dart';
import 'package:project001_app_waiter/pages/base/controller/main_base_controller.dart';
import 'package:project001_app_waiter/pages/kitchen/view/kitchen_screen.dart';
import 'package:project001_app_waiter/pages/requests/controller/requests_controller.dart';
import 'package:project001_app_waiter/pages/table/view/table_tab.dart';
import '../deliver/deliver_tab.dart';

class MainBaseScreen extends StatefulWidget {
  const MainBaseScreen({Key? key}) : super(key: key);

  @override
  State<MainBaseScreen> createState() => _MainBaseScreenState();
}

class _MainBaseScreenState extends State<MainBaseScreen> {
  int currentIndex = 0;
  final pageController = PageController();
  final requestController = RequestsController();
  final mainBaseController = MainBaseController();

  /*Widget _getNotificationIcon() {
    if (requestController.filterByKitchen(0).isEmpty) {
      return const Icon(Icons.room_service_outlined);
    } else {
      return Badge(
          badgeColor: Colors.red,
          badgeContent: const Text(
            '!',
            style: TextStyle(
              color: Colors.white,
              fontSize: 10,
            ),
          ),
          child: const Icon(Icons.room_service_outlined));
    }
  }*/

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageView(
        physics: const NeverScrollableScrollPhysics(),
        controller: pageController,
        children: [
          const TableTab(),
          const KitchenScreen(),
          const DeliverTab(),
          Container(color: Colors.blue),
        ],
      ),

      // Barra de navegação
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: currentIndex,
        // A seleção das 'paginas/icones' 0,1,2,3
        onTap: (index) {
          setState(() {
            currentIndex = index;
            pageController.animateToPage(
              index,
              duration: const Duration(milliseconds: 800),
              curve: Curves.ease,
            );
          });
        },
        type: BottomNavigationBarType.fixed,
        backgroundColor: CustomColors.customSwatchColor,
        selectedItemColor: Colors.white,
        unselectedItemColor: Colors.white.withAlpha(100),
        items: [
          const BottomNavigationBarItem(
            icon: Icon(Icons.table_bar_outlined),
            label: 'Mesas',
          ),
          const BottomNavigationBarItem(
            icon: Icon(Icons.kitchen_outlined),
            label: 'Cozinha',
          ),
          BottomNavigationBarItem(
            icon: Obx((){
              return mainBaseController.notification.value;
            }),
            label: 'Pedidos',
          ),
          const BottomNavigationBarItem(
            icon: Icon(Icons.person_outline),
            label: 'Perfil',
          ),
        ],
      ),
    );
  }
}

I'm putting a text as initial return to make it clear that it's not returning from the widget

Controller

import 'package:badges/badges.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import '../../requests/controller/requests_controller.dart';

class MainBaseController extends GetxController {

  final requestController = RequestsController();

  Rx<Widget> notification =  const Text('Não').obs;

  Widget _getNotificationIcon() {
    if (requestController.filterByKitchen(0).isEmpty) {
      return const Icon(Icons.room_service_outlined);
    } else {
      return Badge(
          badgeColor: Colors.red,
          badgeContent: const Text(
            '!',
            style: TextStyle(
              color: Colors.white,
              fontSize: 10,
            ),
          ),
          child: const Icon(Icons.room_service_outlined));
    }
  }

  Widget iconNot() => notification.value = _getNotificationIcon();

}

CodePudding user response：

class Controller extends GetxController{
  var count = 0.obs;
  increment() => count  ;
}

try with only value instead of widget

CodePudding user response：

First of all, your MainBaseScreen can be a Stateless widget, even better, it can be a GetView<MainBaseController> so you can access the MainBaseController using controller variable.

In the MainBaseController:

  RxString notification =  const 'Não'.obs;

In the MainBaseScreen:

BottomNavigationBarItem(
  icon: Obx(() => Text(controller.notification.value),
  label: 'Pedidos',
        ),