kopia lustrzana https://gitlab.com/soapbox-pub/soapbox
100 wiersze
2.8 KiB
TypeScript
100 wiersze
2.8 KiB
TypeScript
import clsx from 'clsx';
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import throttle from 'lodash/throttle';
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import React, { useState, useEffect, useCallback } from 'react';
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import { useIntl, MessageDescriptor } from 'react-intl';
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import Icon from 'soapbox/components/icon';
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import { Text } from 'soapbox/components/ui';
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import { useSettings } from 'soapbox/hooks';
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interface IScrollTopButton {
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/** Callback when clicked, and also when scrolled to the top. */
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onClick: () => void
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/** Number of unread items. */
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count: number
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/** Message to display in the button (should contain a `{count}` value). */
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message: MessageDescriptor
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/** Distance from the top of the screen (scrolling down) before the button appears. */
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threshold?: number
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/** Distance from the top of the screen (scrolling up) before the action is triggered. */
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autoloadThreshold?: number
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}
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/** Floating new post counter above timelines, clicked to scroll to top. */
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const ScrollTopButton: React.FC<IScrollTopButton> = ({
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onClick,
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count,
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message,
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threshold = 400,
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autoloadThreshold = 50,
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}) => {
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const intl = useIntl();
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const settings = useSettings();
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const [scrolled, setScrolled] = useState<boolean>(false);
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const autoload = settings.get('autoloadTimelines') === true;
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const visible = count > 0 && scrolled;
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const classes = clsx('fixed left-1/2 top-20 z-50 -translate-x-1/2', {
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'hidden': !visible,
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});
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const getScrollTop = (): number => {
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return (document.scrollingElement || document.documentElement).scrollTop;
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};
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const maybeUnload = () => {
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if (autoload && getScrollTop() <= autoloadThreshold) {
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onClick();
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}
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};
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const handleScroll = useCallback(throttle(() => {
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maybeUnload();
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if (getScrollTop() > threshold) {
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setScrolled(true);
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} else {
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setScrolled(false);
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}
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}, 150, { trailing: true }), [autoload, threshold, autoloadThreshold, onClick]);
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const scrollUp = () => {
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window.scrollTo({ top: 0 });
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};
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const handleClick: React.MouseEventHandler = () => {
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setTimeout(scrollUp, 10);
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onClick();
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};
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useEffect(() => {
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window.addEventListener('scroll', handleScroll);
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return () => {
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window.removeEventListener('scroll', handleScroll);
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};
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}, [onClick]);
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useEffect(() => {
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maybeUnload();
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}, [count]);
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return (
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<div className={classes}>
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<a className='flex cursor-pointer items-center space-x-1.5 whitespace-nowrap rounded-full bg-primary-600 px-4 py-2 text-white transition-transform hover:scale-105 hover:bg-primary-700 active:scale-100' onClick={handleClick}>
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<Icon src={require('@tabler/icons/arrow-bar-to-up.svg')} />
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{(count > 0) && (
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<Text theme='inherit' size='sm'>
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{intl.formatMessage(message, { count })}
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</Text>
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)}
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</a>
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</div>
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);
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};
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export default ScrollTopButton;
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