37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
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/**
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* A tool for smooth scrolling and topbar switcher
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*/
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const ScrollHelper = (function () {
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const $body = $("body");
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const ATTR_TOPBAR_VISIBLE = "topbar-visible";
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const topbarHeight = $("#topbar-wrapper").outerHeight();
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let scrollUpCount = 0; // the number of times the scroll up was triggered by ToC or anchor
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let topbarLocked = false;
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let orientationLocked = false;
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return {
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hideTopbar: () => $body.attr(ATTR_TOPBAR_VISIBLE, false),
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showTopbar: () => $body.attr(ATTR_TOPBAR_VISIBLE, true),
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// scroll up
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addScrollUpTask: () => {
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scrollUpCount += 1;
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if (!topbarLocked) { topbarLocked = true; }
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},
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popScrollUpTask: () => scrollUpCount -= 1,
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hasScrollUpTask: () => scrollUpCount > 0,
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topbarLocked: () => topbarLocked === true,
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unlockTopbar: () => topbarLocked = false,
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getTopbarHeight: () => topbarHeight,
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// orientation change
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orientationLocked: () => orientationLocked === true,
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lockOrientation: () => orientationLocked = true,
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unLockOrientation: () => orientationLocked = false
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};
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}());
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