Solution: Dependency Injection
Explore solutions to the dependency injection challenges.
We'll cover the following...
- Solutions
- Challenge 1: Add the Get package
- Challenge 2: Create the CartController class
- Challenge 3: Provide the CartController to the Get library dependency injector and display the number of items in the cart
- Challenge 4: Display the list of items in the cart and the cart total
- Challenge 5: Remove items in the cart when the user dismisses them
- Challenge 6: Add products to the shopping cart
- Final app
Solutions
Compare your solutions with the ones provided below.
name: ecommerce_appdescription: A new Flutter application.publish_to: 'none' # Remove this line if you wish to publish to pub.devversion: 1.0.0+1environment:sdk: ">=2.12.0 <3.0.0"dependencies:flutter:sdk: flutter# SOLUTION-1: Import the get dependencyget: ^4.6.5dev_dependencies:flutter_lints: ^1.0.4flutter:uses-material-design: true
Challenge 1: Add the Get package
In pubspec.yaml file, we import the Get package into your application for state management (line 13).
Challenge 2: Create the CartController class
In the lib/state/cart_controller.dart file, we create a state object class called CartController with a list of CartItem objects. The addItem() and removeItem() functions allow us to add and remove items to and from the list, respectively.
The class also has getters to get the total number of items in the cart and the total checkout price of the cart named itemCount and totalPrice, respectively.