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‎.gitignore

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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/.pnp
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.pnp.js
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# testing
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/coverage
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# production
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/build
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# misc
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.DS_Store
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.env.local
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.env.development.local
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.env.test.local
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.env.production.local
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*

‎.prettierrc

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{
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"semi": true,
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"trailingComma": "es5",
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"singleQuote": true,
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"printWidth": 70
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}

‎.travis.yml

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language: node_js
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node_js:
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- stable
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install:
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- npm install
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script:
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- npm test

‎README.md

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# react-range
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[![Build Status](https://travis-ci.org/the-road-to-learn-react/react-range.svg?branch=master)](https://travis-ci.org/the-road-to-learn-react/react-range) [![Slack](https://slack-the-road-to-learn-react.wieruch.com/badge.svg)](https://slack-the-road-to-learn-react.wieruch.com/) [![Greenkeeper badge](https://badges.greenkeeper.io/the-road-to-learn-react/react-range.svg)](https://greenkeeper.io/)
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Showcasing how a React Range Component could be implemented in React. [Read more about it.](https://www.robinwieruch.de/react-range/)
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[![Edit react-range](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/github/the-road-to-learn-react/react-range/tree/master/?fontsize=14)
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## Installation
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- `git clone git@github.com:the-road-to-learn-react/react-range.git`
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- cd react-range
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- npm install
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- npm start
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- visit `http://localhost:3000`

‎package-lock.json

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‎package.json

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{
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"name": "react-slider",
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"react": "^16.12.0",
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"react-dom": "^16.12.0",
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"react-scripts": "3.2.0",
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"styled-components": "^4.4.1"
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},
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"scripts": {
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"eject": "react-scripts eject"
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},
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"eslintConfig": {
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"extends": "react-app"
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},
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"browserslist": {
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"production": [
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">0.2%",
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"not dead",
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"not op_mini all"
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],
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"development": [
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"last 1 chrome version",
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"last 1 firefox version",
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"last 1 safari version"
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]
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}
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}

‎public/favicon.ico

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‎public/index.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<meta name="theme-color" content="#000000" />
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<meta
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name="description"
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content="Web site created using create-react-app"
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/>
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<link rel="apple-touch-icon" href="logo192.png" />
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<!--
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manifest.json provides metadata used when your web app is installed on a
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user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
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-->
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<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
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<!--
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Notice the use of %PUBLIC_URL% in the tags above.
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It will be replaced with the URL of the `public` folder during the build.
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Only files inside the `public` folder can be referenced from the HTML.
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Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
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work correctly both with client-side routing and a non-root public URL.
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Learn how to configure a non-root public URL by running `npm run build`.
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-->
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<title>React App</title>
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</head>
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<body>
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<noscript>You need to enable JavaScript to run this app.</noscript>
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<div id="root"></div>
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<!--
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This HTML file is a template.
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If you open it directly in the browser, you will see an empty page.
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You can add webfonts, meta tags, or analytics to this file.
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The build step will place the bundled scripts into the <body> tag.
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To begin the development, run `npm start` or `yarn start`.
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To create a production bundle, use `npm run build` or `yarn build`.
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-->
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</body>
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</html>

‎public/logo192.png

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‎public/logo512.png

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‎public/manifest.json

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{
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"short_name": "React App",
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"name": "Create React App Sample",
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"icons": [
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{
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"src": "favicon.ico",
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"sizes": "64x64 32x32 24x24 16x16",
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"type": "image/x-icon"
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},
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{
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"src": "logo192.png",
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"type": "image/png",
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"sizes": "192x192"
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},
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{
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"src": "logo512.png",
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"type": "image/png",
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"sizes": "512x512"
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}
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],
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"start_url": ".",
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"display": "standalone",
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"theme_color": "#000000",
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"background_color": "#ffffff"
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}

‎public/robots.txt

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# https://www.robotstxt.org/robotstxt.html
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User-agent: *

‎src/App.js

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import React from 'react';
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import styled from 'styled-components';
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const RangeHeader = styled.div`
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display: flex;
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justify-content: flex-end;
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`;
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const StyledRange = styled.div`
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border-radius: 3px;
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background: #dddddd;
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margin: 5px;
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height: 15px;
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`;
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const StyledThumb = styled.div`
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width: 10px;
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height: 25px;
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border-radius: 3px;
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position: relative;
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top: -5px;
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opacity: 0.5;
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background: #823eb7;
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cursor: pointer;
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`;
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const getPercentage = (current, max) => (100 * current) / max;
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const getValue = (percentage, max) => (max / 100) * percentage;
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const getLeft = percentage => `calc(${percentage}% - 5px)`;
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const Range = ({
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initial,
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max,
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formatFn = number => number.toFixed(0),
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onChange,
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}) => {
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const initialPercentage = getPercentage(initial, max);
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const rangeRef = React.useRef();
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const thumbRef = React.useRef();
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const currentRef = React.useRef();
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const diff = React.useRef();
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const handleMouseMove = event => {
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let newX =
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event.clientX -
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diff.current -
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rangeRef.current.getBoundingClientRect().left;
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const end =
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rangeRef.current.offsetWidth - thumbRef.current.offsetWidth;
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const start = 0;
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if (newX < start) {
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newX = 0;
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}
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if (newX > end) {
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newX = end;
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}
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const newPercentage = getPercentage(newX, end);
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const newValue = getValue(newPercentage, max);
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thumbRef.current.style.left = getLeft(newPercentage);
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currentRef.current.textContent = formatFn(newValue);
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onChange(newValue);
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};
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const handleMouseUp = () => {
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document.removeEventListener('mouseup', handleMouseUp);
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document.removeEventListener('mousemove', handleMouseMove);
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};
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const handleMouseDown = event => {
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diff.current =
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event.clientX - thumbRef.current.getBoundingClientRect().left;
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document.addEventListener('mousemove', handleMouseMove);
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document.addEventListener('mouseup', handleMouseUp);
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};
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return (
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<>
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<RangeHeader>
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<strong ref={currentRef}>{formatFn(initial)}</strong>
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&nbsp;/&nbsp;
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{max}
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</RangeHeader>
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<StyledRange ref={rangeRef}>
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<StyledThumb
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style={{ left: getLeft(initialPercentage) }}
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ref={thumbRef}
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onMouseDown={handleMouseDown}
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/>
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</StyledRange>
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</>
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);
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};
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const App = () => (
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<div>
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<Range
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initial={10}
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max={25}
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formatFn={number => number.toFixed(2)}
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onChange={value => console.log(value)}
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/>
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</div>
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);
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export default App;

‎src/App.test.js

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import React from 'react';
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import ReactDOM from 'react-dom';
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import App from './App';
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it('renders without crashing', () => {
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const div = document.createElement('div');
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ReactDOM.render(<App />, div);
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ReactDOM.unmountComponentAtNode(div);
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});

‎src/index.js

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import React from 'react';
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import ReactDOM from 'react-dom';
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import App from './App';
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import * as serviceWorker from './serviceWorker';
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ReactDOM.render(<App />, document.getElementById('root'));
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// If you want your app to work offline and load faster, you can change
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// unregister() to register() below. Note this comes with some pitfalls.
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// Learn more about service workers: https://bit.ly/CRA-PWA
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serviceWorker.unregister();

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