Todo App

A simple todo app built with Flutter that demonstrates the usage of the provider package for state management. The app also utilizes shared preferences for persisting the todo list.

Overview

The Todo App allows users to create a list of todos and mark them as completed. It showcases the basic features of the provider package, including listening to changes, accessing state without listening, and selecting specific parts of the state. The app also uses shared preferences to persist the todo list so that it can be loaded between app sessions.

Features

Add new todos to the list.
Toggle the completion status of todos.

Screenshots

Dependencies

Flutter
provider
shared_preferences

Getting Started

Clone the repository:

git clone https://github.com/your-username/todo-app.git

Navigate to the project directory:
```
cd todo-app
```
Install the dependencies:
```
flutter pub get
```
Run the app:
```
flutter run
```

Usage of `provider` and Shared Preferences

The provider package is used for managing the state of the todo list in this app, while shared preferences is used for persisting the todo list between app sessions.

Provider Setup

The TodoListProvider is set up as the provider for managing the state of the todo list.
It extends ChangeNotifier and provides methods to add a todo, toggle todo completion, and complete all todos.
It exposes getters for accessing the list of todos, total number of todos, and total number of completed todos.

Shared Preferences Integration

The TodoListProvider uses shared preferences to persist the todo list.
When the app starts, the loadTodos method is called to retrieve the persisted todo list from shared preferences.
When a todo is added or its completion status is toggled, the saveTodos method is called to update the persisted todo list in shared preferences.

TodoListScreen

The TodoListScreen is the main screen of the app.
It includes an AppBar, an input field for adding new todos, the todo list, the todo count, and a button to complete all todos.

Adding a Todo

When the user taps the "Add" button, the _addTodo method is called.
It retrieves the TodoListProvider using Provider.of and adds a new todo to the list.

TodoList

The TodoList widget displays the list of todos.
It uses context.watch to listen to changes on TodoListProvider.
The list view is built using ListView.builder, and each todo is displayed as a ListTile with a checkbox for marking it as completed.

TodoCount

The TodoCount widget displays the total number of todos and the total number of completed todos.
It utilizes context.select to select the relevant values from TodoListProvider without rebuilding when other parts of the state change.

Completing All Todos

The "Complete All" button in the TodoListScreen triggers the completeAllTodos method.
It retrieves the TodoListProvider using context.read and calls the completeAllTodos method to mark all todos as completed.
The TodoListProvider internally updates the state and triggers a rebuild of the relevant widgets.

Persistence with Shared Preferences

The app uses the shared_preferences package to persist the todo list.
The TodoListProvider utilizes shared preferences to load and save the todo list.
When the app starts, the loadTodos method retrieves the persisted todo list from shared preferences and updates the provider's state.
When a todo is added or its completion status is toggled, the saveTodos method is called to update the persisted todo list in shared preferences.

mike123789-dev/todo_provider