Created
February 19, 2019 17:42
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| import { useEffect, useState } from "react"; | |
| import usePaging from "./usePaging"; | |
| import useHover from "./useHover"; | |
| import useInterval from "./useInterval"; | |
| export default function useAutoPaging( | |
| totalPages: number, | |
| delay = 5000, | |
| defaultPage = 1 | |
| ) { | |
| let { currentPage, goForward, goBack, goTo } = usePaging( | |
| totalPages, | |
| defaultPage | |
| ); | |
| let [pageDelay, setPageDelay] = useState(delay); | |
| let [hoverRef, isHovered] = useHover(); | |
| // If the caller updates the delay prop, update state | |
| useEffect( | |
| () => { | |
| setPageDelay(delay); | |
| }, | |
| [delay] | |
| ); | |
| // Start by setting delay to the prop given by caller | |
| const start = () => setPageDelay(delay); | |
| // Stop by setting the delay to 0. | |
| const stop = () => setPageDelay(0); | |
| useEffect( | |
| () => { | |
| if (isHovered) stop(); | |
| else start(); | |
| }, | |
| [isHovered] | |
| ); | |
| // Call goForward (method from usePaging) every N milliseconds | |
| useInterval(goForward, pageDelay); | |
| // return the usePaging stuff, plus the ref that the caller can use to | |
| // decide which dom element should pause the paging on hover. | |
| return { | |
| currentPage, | |
| goForward, | |
| goBack, | |
| pauseRef: hoverRef as React.MutableRefObject<any>, | |
| goTo | |
| }; | |
| } |
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