Bindings

all_controller_binding.dart

import 'package:flutter_getx/home_controller.dart';
import 'package:flutter_getx/my_controller.dart';
import 'package:get/get.dart';
class AllControllerBinding implements Bindings {
  @override
  void dependencies() {
    Get.lazyPut<MyController>(() => MyController());
    Get.lazyPut<HomeController>(() => HomeController());
  }
}

home.dart

import 'package:flutter/material.dart';
import 'package:flutter_getx/home_controller.dart';
import 'package:flutter_getx/main.dart';
import 'package:get/get.dart';

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Home"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Obx(() => Text(
              'The value is ${Get.find<HomeController>().count}',
              style: TextStyle(fontSize: 25),
            )),
            RaisedButton(
              child: Text("Increment"),
              onPressed: () {
                Get.find<HomeController>().increment();
              },
            ),
            SizedBox(
              height: 10,
            ),
            RaisedButton(
              child: Text("Back"),
              onPressed: () {
                Get.back();
              },
            )
          ],
        ),
      ),
    );
  }
}

home_controller.dart

import 'package:get/get.dart';
class HomeController extends GetxController {
  var count=0.obs;
  void increment() {
    count++;
  }

}

home_controller_binding.dart

import 'package:flutter_getx/home_controller.dart';
import 'package:get/get.dart';
class HomeControllerBinding implements Bindings {
  @override
  void dependencies() {
    Get.lazyPut<HomeController>(() => HomeController());
  }
}

main.dart

import 'package:flutter/material.dart';
import 'package:flutter_getx/all_controller_binding.dart';
import 'package:flutter_getx/home.dart';
import 'package:flutter_getx/home_controller_binding.dart';
import 'package:flutter_getx/my_controller.dart';
import 'package:flutter_getx/myapp_controller_binding.dart';
import 'package:flutter_getx/service.dart';
import 'package:get/get.dart';

void main() {
  //MyAppControllerBinding().dependencies();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return GetMaterialApp(
      // initialBinding: AllControllerBinding(),
      title: "Binding",

      // If binding applied at route level

      //   GetPage(
      //     name: '/home',
      //     page: () => Home(),
      //     binding: HomeControllerBinding(),
      //   ),
      // ],

      //Binding Builder(If we dont want to use separate binding class)
      // getPages: [
      //   GetPage(
      //     name: '/home',
      //     page: () => Home(),
      //     binding: BindingsBuilder(() => {
      //           Get.lazyPut<HomeControllerBinding>(
      //               () => HomeControllerBinding())
      //         }),
      //   ),
      // ],
      home: Scaffold(
        appBar: AppBar(title: Text("Binding")),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              Obx(() => Text(
                    'The value is ${Get.find<MyController>().count}',
                    style: TextStyle(fontSize: 25),
                  )),
              RaisedButton(
                child: Text("Increment"),
                onPressed: () {
                  Get.find<MyController>().increment();
                },
              ),
              SizedBox(
                height: 10,
              ),
              RaisedButton(
                child: Text("Home"),
                onPressed: () {
                  // Get.to(Home());

                  //For named route
                  //Get.toNamed("/home");

                  //for normal routes
                  Get.to(Home(), binding: HomeControllerBinding());
                },
              )
            ],
          ),
        ),
      ),
    );
  }
}
// Smart Management
//GetX provides  SmartManagement that lets us configure how dependencies
// behave in terms of memory management.
// GetMaterialApp {
// smartManagement: SmartManagement.full // or .keepFactory or .onlyBuilder
// }
// Full Mode
// ===========
// Everything gets disposed as soon as the route is removed from navigation stack,
//     unless declared permanent.

// SmartManagement.keepFactory
//================================
// Just like SmartManagement.full, it will remove it's dependencies when '
// 'it's not being used anymore. However, it will keep their factory,
// which means it will recreate the dependency if you need that instance again.


// SmartManagement.onlyBuilders
//================================
// With this option, only controllers started in init: or loaded into a Binding 
// with Get.lazyPut() will be disposed.
//
// If you use Get.put() or Get.putAsync() or any other approach, 
//     SmartManagement will not have permissions to exclude this dependency.

my_controller.dart

import 'package:get/get.dart';


class MyController extends GetxController {
  var count=0.obs;
  void increment() {
    count++;
  }

}

myapp_controller_binding.dart

import 'package:flutter_getx/my_controller.dart';
import 'package:get/get.dart';
class MyAppControllerBinding implements Bindings {
  @override
  void dependencies() {
    Get.lazyPut<MyController>(() => MyController());
  }
}