65 lines
1.3 KiB
JavaScript
65 lines
1.3 KiB
JavaScript
/**
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* A tool for smooth scrolling and topbar switcher
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*/
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const ATTR_TOPBAR_VISIBLE = 'data-topbar-visible';
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const $body = $('body');
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const $topbarWrapper = $('#topbar-wrapper');
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export default class ScrollHelper {
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static scrollUpCount = 0; // the number of times the scroll up was triggered by ToC or anchor
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static topbarIsLocked = false;
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static orientationIsLocked = false;
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static hideTopbar() {
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$body.attr(ATTR_TOPBAR_VISIBLE, 'false');
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}
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static showTopbar() {
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$body.attr(ATTR_TOPBAR_VISIBLE, 'true');
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}
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// scroll up
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static addScrollUpTask() {
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ScrollHelper.scrollUpCount += 1;
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if (!ScrollHelper.topbarIsLocked) {
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ScrollHelper.topbarIsLocked = true;
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}
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}
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static popScrollUpTask() {
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ScrollHelper.scrollUpCount -= 1;
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}
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static hasScrollUpTask() {
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return ScrollHelper.scrollUpCount > 0;
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}
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static topbarLocked() {
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return ScrollHelper.topbarIsLocked === true;
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}
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static unlockTopbar() {
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ScrollHelper.topbarIsLocked = false;
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}
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static getTopbarHeight() {
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return $topbarWrapper.outerHeight();
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}
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// orientation change
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static orientationLocked() {
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return ScrollHelper.orientationIsLocked === true;
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}
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static lockOrientation() {
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ScrollHelper.orientationIsLocked = true;
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}
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static unLockOrientation() {
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ScrollHelper.orientationIsLocked = false;
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}
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}
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