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