ui: improve menu folding (#989)
* ui: improve menu folding Fold/unfold the menu bar just by the amount of scroll, not by its full width * refactor: use a variable for the menu bar height * Fix menu scroll jittering, remove hover folding smoothness Rewrite it to use `position:` `sticky` and `relative` instead of continuous programmatic position changes On-hover folding-unfolding transition removal is a side-effect
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Dylan DPC
GitHub
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@ -580,26 +580,60 @@ function playpen_text(playpen) {
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});
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})();
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(function autoHideMenu() {
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(function controllMenu() {
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var menu = document.getElementById('menu-bar');
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var previousScrollTop = document.scrollingElement.scrollTop;
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(function controllPosition() {
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var scrollTop = document.scrollingElement.scrollTop;
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var prevScrollTop = scrollTop;
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var minMenuY = -menu.clientHeight - 50;
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// When the script loads, the page can be at any scroll (e.g. if you reforesh it).
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menu.style.top = scrollTop + 'px';
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// Same as parseInt(menu.style.top.slice(0, -2), but faster
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var topCache = menu.style.top.slice(0, -2);
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menu.classList.remove('sticky');
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var stickyCache = false; // Same as menu.classList.contains('sticky'), but faster
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document.addEventListener('scroll', function () {
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if (menu.classList.contains('folded') && document.scrollingElement.scrollTop < previousScrollTop) {
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menu.classList.remove('folded');
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} else if (!menu.classList.contains('folded') && document.scrollingElement.scrollTop > previousScrollTop) {
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menu.classList.add('folded');
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scrollTop = Math.max(document.scrollingElement.scrollTop, 0);
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// `null` means that it doesn't need to be updated
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var nextSticky = null;
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var nextTop = null;
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var scrollDown = scrollTop > prevScrollTop;
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var menuPosAbsoluteY = topCache - scrollTop;
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if (scrollDown) {
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nextSticky = false;
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if (menuPosAbsoluteY > 0) {
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nextTop = prevScrollTop;
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}
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if (!menu.classList.contains('bordered') && document.scrollingElement.scrollTop > 0) {
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} else {
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if (menuPosAbsoluteY > 0) {
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nextSticky = true;
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} else if (menuPosAbsoluteY < minMenuY) {
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nextTop = prevScrollTop + minMenuY;
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}
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}
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if (nextSticky === true && stickyCache === false) {
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menu.classList.add('sticky');
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stickyCache = true;
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} else if (nextSticky === false && stickyCache === true) {
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menu.classList.remove('sticky');
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stickyCache = false;
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}
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if (nextTop !== null) {
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menu.style.top = nextTop + 'px';
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topCache = nextTop;
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}
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prevScrollTop = scrollTop;
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}, { passive: true });
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})();
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(function controllBorder() {
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menu.classList.remove('bordered');
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document.addEventListener('scroll', function () {
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if (menu.offsetTop === 0) {
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menu.classList.remove('bordered');
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} else {
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menu.classList.add('bordered');
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}
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if (menu.classList.contains('bordered') && document.scrollingElement.scrollTop === 0) {
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menu.classList.remove('bordered');
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}
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previousScrollTop = Math.max(document.scrollingElement.scrollTop, 0);
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}, { passive: true });
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})();
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})();
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@ -20,14 +20,13 @@ a > .hljs {
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/* Menu Bar */
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#menu-bar {
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position: -webkit-sticky;
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position: sticky;
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top: 0;
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#menu-bar,
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#menu-bar-hover-placeholder {
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z-index: 101;
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margin: auto calc(0px - var(--page-padding));
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}
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#menu-bar > #menu-bar-sticky-container {
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#menu-bar {
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position: relative;
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display: flex;
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flex-wrap: wrap;
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background-color: var(--bg);
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@ -35,10 +34,21 @@ a > .hljs {
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border-bottom-width: 1px;
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border-bottom-style: solid;
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}
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.js #menu-bar > #menu-bar-sticky-container {
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transition: transform 0.3s;
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#menu-bar.sticky,
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.js #menu-bar-hover-placeholder:hover + #menu-bar,
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.js #menu-bar:hover,
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.js.sidebar-visible #menu-bar {
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position: -webkit-sticky;
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position: sticky;
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top: 0 !important;
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}
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#menu-bar.bordered > #menu-bar-sticky-container {
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#menu-bar-hover-placeholder {
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position: sticky;
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position: -webkit-sticky;
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top: 0;
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height: var(--menu-bar-height);
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}
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#menu-bar.bordered {
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border-bottom-color: var(--table-border-color);
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}
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#menu-bar i, #menu-bar .icon-button {
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@ -72,10 +82,6 @@ a > .hljs {
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text-decoration: none;
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}
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html:not(.sidebar-visible) #menu-bar:not(:hover).folded > #menu-bar-sticky-container {
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transform: translateY(calc(-10px - var(--menu-bar-height)));
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}
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.left-buttons {
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display: flex;
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margin: 0 5px;
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@ -60,6 +60,7 @@ h4 a.header:target {
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.page {
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outline: 0;
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padding: 0 var(--page-padding);
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margin-top: calc(0px - var(--menu-bar-height)); /* Compensate for the #menu-bar-hover-placeholder */
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}
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.page-wrapper {
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box-sizing: border-box;
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@ -97,8 +97,8 @@
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<div class="page">
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{{> header}}
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<div id="menu-bar" class="menu-bar">
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<div id="menu-bar-sticky-container">
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<div id="menu-bar-hover-placeholder"></div>
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<div id="menu-bar" class="menu-bar sticky bordered">
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<div class="left-buttons">
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<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
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<i class="fa fa-bars"></i>
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@ -133,7 +133,6 @@
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{{/if}}
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</div>
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</div>
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</div>
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{{#if search_enabled}}
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<div id="search-wrapper" class="hidden">
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