const Clipboard = require("clipboard");
-const Code = require('../code');
+const Code = require('../libs/code');
let setupPageShow = window.setupPageShow = function (pageId) {
let $window = $(window);
let $sidebar = $("#sidebar .scroll-body");
let $bookTreeParent = $sidebar.parent();
+
// Check the page is scrollable and the content is taller than the tree
let pageScrollable = ($(document).height() > $window.height()) && ($sidebar.height() < $('.page-content').height());
+
// Get current tree's width and header height
let headerHeight = $("#header").height() + $(".toolbar").height();
let isFixed = $window.scrollTop() > headerHeight;
- // Function to fix the tree as a sidebar
+
+ // Fix the tree as a sidebar
function stickTree() {
$sidebar.width($bookTreeParent.width() + 15);
$sidebar.addClass("fixed");
isFixed = true;
}
- // Function to un-fix the tree back into position
+
+ // Un-fix the tree back into position
function unstickTree() {
$sidebar.css('width', 'auto');
$sidebar.removeClass("fixed");
isFixed = false;
}
+
// Checks if the tree stickiness state should change
function checkTreeStickiness(skipCheck) {
let shouldBeFixed = $window.scrollTop() > headerHeight;
if ('IntersectionObserver' in window &&
'IntersectionObserverEntry' in window &&
'intersectionRatio' in window.IntersectionObserverEntry.prototype) {
- $(document).ready(function () {
- // fetch all the headings.
- let headings = document.querySelector('.page-content').querySelectorAll('h1, h2, h3, h4, h5, h6');
- // if headings are present, add observers.
- if (headings.length > 0) {
- addNavObserver(headings);
- }
- });
+ addPageHighlighting();
}
- let $pageNav = null;
- function addNavObserver(headings) {
- // Setup the intersection observer.
- // margin top = -25px to trigger the threshold change before the heading
- // has completely left the viewport on the top.
- let intersectOpts = {
- rootMargin: '-25px 0px 0px 0px',
- threshold: 1.0
- }
- $pageNav = $('.sidebar-page-nav');
- let pageNavObserver = new IntersectionObserver(cbHeadingVisible, intersectOpts);
-
- // observe each heading
- for (let i = 0; i !== headings.length; ++i) {
- pageNavObserver.observe(headings[i]);
- }
- }
-
- function cbHeadingVisible(entries, observer) {
- let element = null;
- for (let i = 0; i !== entries.length; ++i) {
- let currentEntry = entries[i];
- // check if its currently visible and its distance from top of viewport is less than 100
- if (currentEntry.intersectionRatio <= 1 && currentEntry.boundingClientRect.y < 100) {
- element = currentEntry.target;
- } else {
- break;
+ function addPageHighlighting() {
+ let pageNav = document.querySelector('.sidebar-page-nav');
+
+ // fetch all the headings.
+ let headings = document.querySelector('.page-content').querySelectorAll('h1, h2, h3, h4, h5, h6');
+ // if headings are present, add observers.
+ if (headings.length > 0 && pageNav !== null) {
+ addNavObserver(headings);
+ }
+
+ function addNavObserver(headings) {
+ // Setup the intersection observer.
+ let intersectOpts = {
+ rootMargin: '0px 0px 0px 0px',
+ threshold: 1.0
+ };
+ let pageNavObserver = new IntersectionObserver(headingVisibilityChange, intersectOpts);
+
+ // observe each heading
+ for (let i = 0; i !== headings.length; ++i) {
+ pageNavObserver.observe(headings[i]);
+ }
+ }
+
+ function headingVisibilityChange(entries, observer) {
+ for (let i = 0; i < entries.length; i++) {
+ let currentEntry = entries[i];
+ let isVisible = (currentEntry.intersectionRatio === 1);
+ toggleAnchorHighlighting(currentEntry.target.id, isVisible);
+ }
+ }
+
+ function toggleAnchorHighlighting(elementId, shouldHighlight) {
+ let anchorsToHighlight = pageNav.querySelectorAll('a[href="#' + elementId + '"]');
+ for (let i = 0; i < anchorsToHighlight.length; i++) {
+ // Change below to use classList.toggle when IE support is dropped.
+ if (shouldHighlight) {
+ anchorsToHighlight[i].classList.add('current-heading');
+ } else {
+ anchorsToHighlight[i].classList.remove('current-heading');
+ }
}
}
- if (!element) {
- return;
- }
- let elementId = element.id;
- $pageNav.find('a').removeClass('current-heading');
- $pageNav.find('a[href="#' + elementId + '"]').addClass('current-heading');
}
-
};
module.exports = setupPageShow;
\ No newline at end of file