110 lines
2.9 KiB
JavaScript
110 lines
2.9 KiB
JavaScript
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/**
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Safari doesn't support CSS `scroll-behavior: smooth`,
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so here is a compatible solution for all browser to smooth scrolling
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See: <https://css-tricks.com/snippets/jquery/smooth-scrolling/>
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Warning: It must be called after all `<a>` tags (e.g., the dynamic TOC) are ready.
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*/
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import ScrollHelper from './utils/scroll-helper';
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export function smoothScroll() {
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const $topbarTitle = $('#topbar-title');
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const REM = 16; // in pixels
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const ATTR_SCROLL_FOCUS = 'scroll-focus';
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const SCOPE = "a[href*='#']:not([href='#']):not([href='#0'])";
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$(SCOPE).on('click', function (event) {
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if (
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this.pathname.replace(/^\//, '') !== location.pathname.replace(/^\//, '')
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) {
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return;
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}
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if (location.hostname !== this.hostname) {
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return;
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}
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const hash = decodeURI(this.hash);
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let toFootnoteRef = RegExp(/^#fnref:/).test(hash);
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let toFootnote = toFootnoteRef ? false : RegExp(/^#fn:/).test(hash);
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let selector = '#' + $.escapeSelector(hash.substring(1));
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let $target = $(selector);
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let isMobileViews = $topbarTitle.is(':visible');
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let isPortrait = $(window).width() < $(window).height();
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if (typeof $target === 'undefined') {
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return;
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}
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event.preventDefault();
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if (history.pushState) {
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/* add hash to URL */
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history.pushState(null, null, hash);
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}
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let curOffset = $(window).scrollTop();
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let destOffset = ($target.offset().top -= REM / 2);
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if (destOffset < curOffset) {
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// scroll up
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ScrollHelper.hideTopbar();
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ScrollHelper.addScrollUpTask();
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if (isMobileViews && isPortrait) {
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destOffset -= ScrollHelper.getTopbarHeight();
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}
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} else {
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// scroll down
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if (isMobileViews && isPortrait) {
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destOffset -= ScrollHelper.getTopbarHeight();
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}
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}
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$('html').animate(
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{
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scrollTop: destOffset
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},
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500,
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() => {
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$target.trigger('focus');
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/* clean up old scroll mark */
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const $scroll_focus = $(`[${ATTR_SCROLL_FOCUS}=true]`);
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if ($scroll_focus.length) {
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$scroll_focus.attr(ATTR_SCROLL_FOCUS, 'false');
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}
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/* Clean :target links */
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const $target_links = $(':target');
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if ($target_links.length) {
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/* element that visited by the URL with hash */
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$target_links.attr(ATTR_SCROLL_FOCUS, 'false');
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}
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/* set scroll mark to footnotes */
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if (toFootnote || toFootnoteRef) {
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$target.attr(ATTR_SCROLL_FOCUS, 'true');
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}
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if ($target.is(':focus')) {
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/* Checking if the target was focused */
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return false;
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} else {
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$target.attr(
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'tabindex',
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'-1'
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); /* Adding tabindex for elements not focusable */
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$target.trigger('focus'); /* Set focus again */
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}
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if (ScrollHelper.hasScrollUpTask()) {
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ScrollHelper.popScrollUpTask();
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}
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}
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);
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}); /* click() */
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}
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