Enum with extensions in Flutter

- Andrés Cruz

En español
Enum with extensions in Flutter

An enumerated data type (also known as "enumeration" or "enum") is a data type that consists of a set of possible values, which are clearly enumerated in the type declaration. Instead of representing a value (such as an integer), it is represented by an array of key/value values. Enumerated types are a useful way of doing constant sorts in your application.

In this article, we discuss how we can extend the functionality of our Enum using extension methods.

Let's create Enum

enum BottomTabEnum {
  home,
  video,
  shop,
  profile,
}

The Enum we created above is for the bottom tabs of our application. We use this Enum for our bottom navigation bar. We have 4 tabs in our app. We will now add more purpose to this Enum using extension methods.

extension BottomTabsExt on BottomTabsEnum {
  String get title {
    switch (this) {
      case BottomTabsEnum.home:
        return 'Home';
      case BottomTabsEnum.video:
        return 'Explore';
      case BottomTabsEnum.shop:
        return 'Shop';
      case BottomTabsEnum.profile:
        return 'Profile';
    }
  }
  String get iconAssetLocation {
    switch (this) {
      case BottomTabsEnum.home:
        return Assets.imagesChefCooking;
      case BottomTabsEnum.video:
        return Assets.imagesVideoCamera;
      case BottomTabsEnum.shop:
        return Assets.imagesOnlinePayment;
      case BottomTabsEnum.profile:
        return Assets.imagesWomanUsingPhone;
    }
  }
  Color get bgColor {
    switch (this) {
      case BottomTabsEnum.home:
        return const Color(0xFFEDC35D);
      case BottomTabsEnum.video:
        return const Color(0xFFF59273);
      case BottomTabsEnum.shop:
        return const Color(0xFFE1EFEE);
      case BottomTabsEnum.profile:
        return const Color(0xFFF2BBBB);
    }
  }
  onClicked() {
    switch (this) {
      case BottomTabsEnum.home:
        ///Handle onClick
        break;
      case BottomTabsEnum.video:
        ///Handle onClick
        break;
      case BottomTabsEnum.shop:
        ///Handle onClick
        break;
      case BottomTabsEnum.profile:
        ///Handle onClick
        break;
    }
  }
}

We have created different extension methods for our Enum. This will simplify our code greatly.

Let's use our Enums in an app in Flutter

    ///To get the title
    Text(BottomTabsEnum.video.title);
    ///To get the icon asset location
    Image.asset(
      BottomTabsEnum.home.iconAssetLocation,
      width: 18,
      height: 18,
    );
    ///To get the bg color
    Text(
      'Cool extension',
      style: TextStyle(
        color: BottomTabsEnum.profile.bgColor,
        fontSize: 14,
        height: 1,
        fontWeight: FontWeight.w600,
      ),
    );
    ///To perform click action
    GestureDetector(
      onTap: () {
        BottomTabsEnum.home.onClicked();
      },
      child: child,
    );

With the example above, you can see that there are endless possibilities. We can assign more functions to our Enum constants without creating additional classes.

https://arkapp.medium.com/supercharge-enum-with-extensions-in-flutter-abf8fdf706fe

Andrés Cruz

Desarrollo con Laravel, Django, Flask, CodeIgniter, HTML5, CSS3, MySQL, JavaScript, Vue, Android, iOS, Flutter

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