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@xeinebiu/react-mvvm

v2.0.7

Published

In software development, a view model is an architectural pattern that separates the presentation layer (UI) from the business logic layer.

Downloads

256

Readme

View Models and Separating Business Logic from UI

In software development, a view model is an architectural pattern that separates the presentation layer (UI) from the business logic layer.

Getting Started

Installation

npm i @xeinebiu/[email protected]

Creating a ViewModel

To create a new view model, extend the ViewModel class provided by this library:

import { createViewModel } from '@xeinebiu/react-mvvm';

const counterViewModel = createViewModel({ counter: 0 }, viewModel => ({
    increment: () =>
        viewModel.setState({ counter: viewModel.getState().counter + 1 }),
    decrement: () =>
        viewModel.setState({ counter: viewModel.getState().counter - 1 }),
}));

Using useSelector Hook

The useSelector hook allows you to subscribe to changes in the view model state and efficiently update your components:

import { useSelector } from '@xeinebiu/react-mvvm';

function CounterComponent() {
    const count = useSelector(counterViewModel, vm => vm.getState().count);

    return (
        <div>
            <p>Count: {count}</p>
            <button onClick={counterViewModel.increment}>Increment</button>
            <button onClick={counterViewModel.decrement}>Decrement</button>
        </div>
    );
}

In this example, the CounterComponent will automatically re-render whenever the count state in the CounterViewModel changes.

API

ViewModel

| Method | Description | |------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------| | constructor(initialState: T) | Creates a new instance of ViewModel with the provided initial state. | | getState(): T | Returns the current state of the ViewModel. | | setState(newState: Partial<T>): void | Updates the state of the ViewModel with the provided partial state object. | | subscribe(listener: Listener<T>): () => void | Subscribes a listener function to be called whenever the state of the ViewModel changes. Returns an unsubscribe function. | | dispose(): void | Clears all listeners and disposes of the ViewModel. |

useSelector

(viewModel: T, selector: (viewModel: T) => S): S

A hook that subscribes to changes in the ViewModel's state and efficiently updates the component when the selected state changes.

License

This library is licensed under the MIT License.