Updated

Signed-off-by: Avior <github@avior.me>

src/Loader/index.tsx

@@ -0,0 +1,97 @@
+import { Router } from 'next/router'
+import React from 'react'
+import { buildClassName } from '../Util'
+import css from './Loader.module.styl'
+
+interface Props {
+	/**
+	 * The new Percentage (if you calculate it yourself)
+	 */
+	percent?: number
+
+	/**
+	 * Auto random loader
+	 */
+	auto?: {
+		/**
+		 * the minimum and maximum interval between two increment
+		 */
+		interval: [number, number]
+		/**
+		 * the minimum and maximum incrementation (MUST be an integer)
+		 */
+		increment: [number, number]
+	}
+}
+
+interface State {
+	percent?: number
+}
+
+/**
+ * Display a simple loading animation at the top of the page
+ *
+ * @version 1.0.0
+ */
+export default class Loader extends React.Component<Props, State> {
+
+	public state: State = {}
+
+	private interval?: NodeJS.Timeout
+
+	public componentDidMount() {
+		if (this.props.auto) {
+			Router.events.on('routeChangeComplete', this.routeChangeComplete)
+			Router.events.on('routeChangeStart', this.routeChangeStart)
+		}
+	}
+
+	public componentWillUnmount() {
+		if (this.props.auto) {
+			Router.events.off('routeChangeComplete', this.routeChangeComplete)
+			Router.events.off('routeChangeStart', this.routeChangeStart)
+		}
+	}
+
+	public render = () => (
+		<div className={buildClassName(css.div, [css.hide, (this.props.percent || this.state.percent) === 100])}>
+			<div style={{width: (this.props.percent || this.state.percent) ? `${(this.props.percent || this.state.percent)}%` : 0}}></div>
+		</div>
+	)
+
+	private routeChangeComplete = () => {
+		if (this.interval) {
+			clearTimeout(this.interval)
+			this.interval = undefined
+		}
+		this.setState({percent: 100})
+	}
+
+	private routeChangeStart = () => {
+		if (this.interval) {
+			clearTimeout(this.interval)
+		}
+		this.setState({percent: 0}, () => {
+			if (!this.props.auto) {return}
+			this.interval = setTimeout(this.timeoutFn, this.randomInt(this.props.auto.interval[0], this.props.auto.interval[1]))
+		})
+	}
+
+	private timeoutFn = () => {
+		if (!this.props.auto) {return}
+		const p = this.state.percent || 0
+		this.setState({
+			percent: Math.min(
+				99,
+				p >= 80 ? p + Math.random() : p + this.randomInt(this.props.auto.increment[0], this.props.auto.increment[1])
+			)
+		})
+		this.interval = setTimeout(this.timeoutFn, this.randomInt(this.props.auto.interval[0], this.props.auto.interval[1]))
+	}
+
+	private randomInt(min = 0, max = 10) {
+		min = Math.ceil(min)
+		max = Math.floor(max)
+		return Math.floor(Math.random() * (max - min + 1)) + min
+	}
+}