94 lines
2.1 KiB
JavaScript
94 lines
2.1 KiB
JavaScript
/**
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* Hide Header on scroll down
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*/
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import ScrollHelper from './utils/scroll-helper';
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const $searchInput = $('#search-input');
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const delta = ScrollHelper.getTopbarHeight();
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let didScroll;
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let lastScrollTop = 0;
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function hasScrolled() {
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let st = $(window).scrollTop();
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/* Make sure they scroll more than delta */
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if (Math.abs(lastScrollTop - st) <= delta) {
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return;
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}
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if (st > lastScrollTop) {
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/* Scroll down */
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ScrollHelper.hideTopbar();
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if ($searchInput.is(':focus')) {
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$searchInput.trigger('blur'); /* remove focus */
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}
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} else {
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/* Scroll up */
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// has not yet scrolled to the bottom of the screen, that is, there is still space for scrolling
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if (st + $(window).height() < $(document).height()) {
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if (ScrollHelper.hasScrollUpTask()) {
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return;
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}
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if (ScrollHelper.topbarLocked()) {
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// avoid redundant scroll up event from smooth scrolling
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ScrollHelper.unlockTopbar();
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} else {
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if (ScrollHelper.orientationLocked()) {
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// avoid device auto scroll up on orientation change
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ScrollHelper.unLockOrientation();
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} else {
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ScrollHelper.showTopbar();
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}
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}
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}
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}
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lastScrollTop = st;
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} // hasScrolled()
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function handleLandscape() {
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if ($(window).scrollTop() === 0) {
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return;
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}
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ScrollHelper.lockOrientation();
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ScrollHelper.hideTopbar();
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}
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export function switchTopbar() {
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const orientation = screen.orientation;
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if (orientation) {
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orientation.onchange = () => {
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const type = orientation.type;
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if (type === 'landscape-primary' || type === 'landscape-secondary') {
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handleLandscape();
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}
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};
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} else {
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// for the browsers that not support `window.screen.orientation` API
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$(window).on('orientationchange', () => {
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if ($(window).width() < $(window).height()) {
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// before rotating, it is still in portrait mode.
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handleLandscape();
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}
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});
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}
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$(window).on('scroll', () => {
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if (didScroll) {
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return;
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}
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didScroll = true;
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});
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setInterval(() => {
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if (didScroll) {
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hasScrolled();
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didScroll = false;
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}
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}, 250);
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}
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