@uppy/dashboard/lib/components/Slide.js

Universal UI plugin for Uppy.

import classNames from 'classnames';
import { cloneElement, h, toChildArray, } from 'preact';
import { useEffect, useRef, useState } from 'preact/hooks';
const transitionName = 'uppy-transition-slideDownUp';
const duration = 250;
/**
 * Vertical slide transition.
 *
 * This can take a _single_ child component, which _must_ accept a `className` prop.
 *
 * Currently this is specific to the `uppy-transition-slideDownUp` transition,
 * but it should be simple to extend this for any type of single-element
 * transition by setting the CSS name and duration as props.
 */
function Slide({ children }) {
    const [cachedChildren, setCachedChildren] = useState(null);
    const [className, setClassName] = useState('');
    const enterTimeoutRef = useRef();
    const leaveTimeoutRef = useRef();
    const animationFrameRef = useRef();
    const handleEnterTransition = () => {
        setClassName(`${transitionName}-enter`);
        cancelAnimationFrame(animationFrameRef.current);
        clearTimeout(leaveTimeoutRef.current);
        leaveTimeoutRef.current = undefined;
        animationFrameRef.current = requestAnimationFrame(() => {
            setClassName(`${transitionName}-enter ${transitionName}-enter-active`);
            enterTimeoutRef.current = setTimeout(() => {
                setClassName('');
            }, duration);
        });
    };
    const handleLeaveTransition = () => {
        setClassName(`${transitionName}-leave`);
        cancelAnimationFrame(animationFrameRef.current);
        clearTimeout(enterTimeoutRef.current);
        enterTimeoutRef.current = undefined;
        animationFrameRef.current = requestAnimationFrame(() => {
            setClassName(`${transitionName}-leave ${transitionName}-leave-active`);
            leaveTimeoutRef.current = setTimeout(() => {
                setCachedChildren(null);
                setClassName('');
            }, duration);
        });
    };
    useEffect(() => {
        const child = toChildArray(children)[0];
        if (cachedChildren === child)
            return;
        if (child && !cachedChildren) {
            handleEnterTransition();
        }
        else if (cachedChildren && !child && !leaveTimeoutRef.current) {
            handleLeaveTransition();
        }
        setCachedChildren(child);
    }, [children, cachedChildren]); // Dependency array to trigger effect on children change
    useEffect(() => {
        return () => {
            clearTimeout(enterTimeoutRef.current);
            clearTimeout(leaveTimeoutRef.current);
            cancelAnimationFrame(animationFrameRef.current);
        };
    }, []); // Cleanup useEffect
    if (!cachedChildren)
        return null;
    return cloneElement(cachedChildren, {
        className: classNames(className, cachedChildren.props.className),
    });
}
export default Slide;