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October 17, 2022 20:56
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| import { Portal } from "@radix-ui/react-portal"; | |
| import clsx from "clsx"; | |
| import { useAtom } from "jotai"; | |
| import { atomWithMachine } from "jotai/xstate"; | |
| import { useRouter } from "next/router"; | |
| import { useEffect } from "react"; | |
| import { assign, createMachine } from "xstate"; | |
| import clamp from "lodash/clamp"; | |
| /** | |
| * This is all NProgress's nice defaults for how | |
| * quickly to increment the bar. | |
| */ | |
| function inc(n: number): number { | |
| let amount: number; | |
| if (n >= 0 && n < 0.2) { | |
| amount = 0.1; | |
| } else if (n >= 0.2 && n < 0.5) { | |
| amount = 0.04; | |
| } else if (n >= 0.5 && n < 0.8) { | |
| amount = 0.02; | |
| } else if (n >= 0.8 && n < 0.99) { | |
| amount = 0.005; | |
| } else { | |
| amount = 0; | |
| } | |
| n = clamp(n + amount, 0, 0.994); | |
| return n; | |
| } | |
| const progressMachine = createMachine<{ percent: number }>({ | |
| id: "router-progress", | |
| predictableActionArguments: true, | |
| schema: { | |
| context: {} as { percent: number }, | |
| events: {} as { type: "start" } | { type: "finish" } | { type: "tick" }, | |
| }, | |
| initial: "hidden", | |
| context: { | |
| percent: 0, | |
| }, | |
| states: { | |
| hidden: {}, | |
| visible: { | |
| invoke: { | |
| src: () => (cb) => { | |
| const interval = setInterval(() => { | |
| cb("tick"); | |
| }, 200); | |
| return () => { | |
| clearInterval(interval); | |
| }; | |
| }, | |
| }, | |
| on: { | |
| tick: { | |
| actions: assign({ | |
| percent: (context) => inc(context.percent), | |
| }), | |
| }, | |
| }, | |
| }, | |
| /** | |
| * Kind of a kludge. The intent here is to show the loading | |
| * bar go to 100%, then hide it after the transition. Doing this | |
| * in `finish` might be the right way. | |
| */ | |
| done: { | |
| after: { | |
| 200: { | |
| target: "hidden", | |
| }, | |
| }, | |
| }, | |
| }, | |
| on: { | |
| start: { | |
| target: "visible", | |
| actions: assign({ | |
| percent: 0, | |
| }), | |
| }, | |
| finish: { | |
| target: "done", | |
| actions: assign({ | |
| percent: 1, | |
| }), | |
| }, | |
| }, | |
| }); | |
| export const progressMachineAtom = atomWithMachine(() => progressMachine); | |
| export function RouterProgressBar() { | |
| const [machine, send] = useAtom(progressMachineAtom); | |
| const router = useRouter(); | |
| useEffect(() => { | |
| const sendStart = () => { | |
| send("start"); | |
| }; | |
| const sendFinish = () => { | |
| send("finish"); | |
| }; | |
| router.events.on("routeChangeStart", sendStart); | |
| router.events.on("routeChangeError", sendFinish); | |
| router.events.on("routeChangeComplete", sendFinish); | |
| return () => { | |
| router.events.off("routeChangeStart", sendStart); | |
| router.events.off("routeChangeError", sendFinish); | |
| router.events.off("routeChangeComplete", sendFinish); | |
| }; | |
| }, [router, send]); | |
| const show = machine.matches("visible") || machine.matches("done"); | |
| return ( | |
| <Portal> | |
| <div | |
| className={clsx( | |
| "fixed top-0 left-0 right-0", | |
| show ? "opacity-100" : "opacity-0" | |
| )} | |
| > | |
| {show ? ( | |
| <div | |
| className="bg-purple-300 dark:bg-purple-500 h-1 transition-all" | |
| style={{ | |
| width: `${(machine.context.percent * 100).toFixed(2)}%`, | |
| }} | |
| /> | |
| ) : null} | |
| </div> | |
| </Portal> | |
| ); | |
| } |
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