BookStack Code Mirror - bookstack/blob - resources/assets/js/components/page-display.js

   1 import Clipboard from "clipboard/dist/clipboard.min";
   2 import Code from "../services/code";
   3
   4 class PageDisplay {
   5
   6     constructor(elem) {
   7         this.elem = elem;
   8         this.pageId = elem.getAttribute('page-display');
   9
  10         Code.highlight();
  11         this.setupPointer();
  12         this.setupStickySidebar();
  13         this.setupNavHighlighting();
  14
  15         // Check the hash on load
  16         if (window.location.hash) {
  17             let text = window.location.hash.replace(/\%20/g, ' ').substr(1);
  18             this.goToText(text);
  19         }
  20
  21         // Sidebar page nav click event
  22         $('.sidebar-page-nav').on('click', 'a', event => {
  23             this.goToText(event.target.getAttribute('href').substr(1));
  24         });
  25     }
  26
  27     goToText(text) {
  28         let idElem = document.getElementById(text);
  29         $('.page-content [data-highlighted]').attr('data-highlighted', '').css('background-color', '');
  30         if (idElem !== null) {
  31             window.scrollAndHighlight(idElem);
  32         } else {
  33             $('.page-content').find(':contains("' + text + '")').smoothScrollTo();
  34         }
  35     }
  36
  37     setupPointer() {
  38         if (document.getElementById('pointer') === null) return;
  39         // Set up pointer
  40         let $pointer = $('#pointer').detach();
  41         let pointerShowing = false;
  42         let $pointerInner = $pointer.children('div.pointer').first();
  43         let isSelection = false;
  44         let pointerModeLink = true;
  45         let pointerSectionId = '';
  46
  47         // Select all contents on input click
  48         $pointer.on('click', 'input', event => {
  49             $(this).select();
  50             event.stopPropagation();
  51         });
  52
  53         $pointer.on('click focus', event => {
  54             event.stopPropagation();
  55         });
  56
  57         // Pointer mode toggle
  58         $pointer.on('click', 'span.icon', event => {
  59             event.stopPropagation();
  60             let $icon = $(event.currentTarget);
  61             pointerModeLink = !pointerModeLink;
  62             $icon.find('[data-icon="include"]').toggle(!pointerModeLink);
  63             $icon.find('[data-icon="link"]').toggle(pointerModeLink);
  64             updatePointerContent();
  65         });
  66
  67         // Set up clipboard
  68         let clipboard = new Clipboard($pointer[0].querySelector('button'));
  69
  70         // Hide pointer when clicking away
  71         $(document.body).find('*').on('click focus', event => {
  72             if (!pointerShowing || isSelection) return;
  73             $pointer.detach();
  74             pointerShowing = false;
  75         });
  76
  77         let updatePointerContent = ($elem) => {
  78             let inputText = pointerModeLink ? window.baseUrl(`/link/${this.pageId}#${pointerSectionId}`) : `{{@${this.pageId}#${pointerSectionId}}}`;
  79             if (pointerModeLink && inputText.indexOf('http') !== 0) inputText = window.location.protocol + "//" + window.location.host + inputText;
  80
  81             $pointer.find('input').val(inputText);
  82
  83             // update anchor if present
  84             const $editAnchor = $pointer.find('#pointer-edit');
  85             if ($editAnchor.length !== 0 && $elem) {
  86                 const editHref = $editAnchor.data('editHref');
  87                 const element = $elem[0];
  88                 const elementId = element.id;
  89
  90                 // get the first 50 characters.
  91                 let queryContent = element.textContent && element.textContent.substring(0, 50);
  92                 $editAnchor[0].href = `${editHref}?content-id=${elementId}&content-text=${encodeURIComponent(queryContent)}`;
  93             }
  94         };
  95
  96         // Show pointer when selecting a single block of tagged content
  97         $('.page-content [id^="bkmrk"]').on('mouseup keyup', function (e) {
  98             e.stopPropagation();
  99             let selection = window.getSelection();
 100             if (selection.toString().length === 0) return;
 101
 102             // Show pointer and set link
 103             let $elem = $(this);
 104             pointerSectionId = $elem.attr('id');
 105             updatePointerContent($elem);
 106
 107             $elem.before($pointer);
 108             $pointer.show();
 109             pointerShowing = true;
 110
 111             // Set pointer to sit near mouse-up position
 112             let pointerLeftOffset = (e.pageX - $elem.offset().left - ($pointerInner.width() / 2));
 113             if (pointerLeftOffset < 0) pointerLeftOffset = 0;
 114             let pointerLeftOffsetPercent = (pointerLeftOffset / $elem.width()) * 100;
 115             $pointerInner.css('left', pointerLeftOffsetPercent + '%');
 116
 117             isSelection = true;
 118             setTimeout(() => {
 119                 isSelection = false;
 120             }, 100);
 121         });
 122     }
 123
 124     setupStickySidebar() {
 125         // Make the sidebar stick in view on scroll
 126         let $window = $(window);
 127         let $sidebar = $("#sidebar .scroll-body");
 128         let $bookTreeParent = $sidebar.parent();
 129
 130         // Check the page is scrollable and the content is taller than the tree
 131         let pageScrollable = ($(document).height() > ($window.height() + 40)) && ($sidebar.height() < $('.page-content').height());
 132
 133         // Get current tree's width and header height
 134         let headerHeight = $("#header").height() + $(".toolbar").height();
 135         let isFixed = $window.scrollTop() > headerHeight;
 136
 137         // Fix the tree as a sidebar
 138         function stickTree() {
 139             $sidebar.width($bookTreeParent.width() - 32);
 140             $sidebar.addClass("fixed");
 141             isFixed = true;
 142         }
 143
 144         // Un-fix the tree back into position
 145         function unstickTree() {
 146             $sidebar.css('width', 'auto');
 147             $sidebar.removeClass("fixed");
 148             isFixed = false;
 149         }
 150
 151         // Checks if the tree stickiness state should change
 152         function checkTreeStickiness(skipCheck) {
 153             let shouldBeFixed = $window.scrollTop() > headerHeight;
 154             if (shouldBeFixed && (!isFixed || skipCheck)) {
 155                 stickTree();
 156             } else if (!shouldBeFixed && (isFixed || skipCheck)) {
 157                 unstickTree();
 158             }
 159         }
 160         // The event ran when the window scrolls
 161         function windowScrollEvent() {
 162             checkTreeStickiness(false);
 163         }
 164
 165         // If the page is scrollable and the window is wide enough listen to scroll events
 166         // and evaluate tree stickiness.
 167         if (pageScrollable && $window.width() > 1000) {
 168             $window.on('scroll', windowScrollEvent);
 169             checkTreeStickiness(true);
 170         }
 171
 172         // Handle window resizing and switch between desktop/mobile views
 173         $window.on('resize', event => {
 174             if (pageScrollable && $window.width() > 1000) {
 175                 $window.on('scroll', windowScrollEvent);
 176                 checkTreeStickiness(true);
 177             } else {
 178                 $window.off('scroll', windowScrollEvent);
 179                 unstickTree();
 180             }
 181         });
 182     }
 183
 184     setupNavHighlighting() {
 185         // Check if support is present for IntersectionObserver
 186         if (!'IntersectionObserver' in window ||
 187             !'IntersectionObserverEntry' in window ||
 188             !'intersectionRatio' in window.IntersectionObserverEntry.prototype) {
 189             return;
 190         }
 191
 192         let pageNav = document.querySelector('.sidebar-page-nav');
 193
 194         // fetch all the headings.
 195         let headings = document.querySelector('.page-content').querySelectorAll('h1, h2, h3, h4, h5, h6');
 196         // if headings are present, add observers.
 197         if (headings.length > 0 && pageNav !== null) {
 198             addNavObserver(headings);
 199         }
 200
 201         function addNavObserver(headings) {
 202             // Setup the intersection observer.
 203             let intersectOpts = {
 204                 rootMargin: '0px 0px 0px 0px',
 205                 threshold: 1.0
 206             };
 207             let pageNavObserver = new IntersectionObserver(headingVisibilityChange, intersectOpts);
 208
 209             // observe each heading
 210             for (let i = 0; i !== headings.length; ++i) {
 211                 pageNavObserver.observe(headings[i]);
 212             }
 213         }
 214
 215         function headingVisibilityChange(entries, observer) {
 216             for (let entry of entries) {
 217                 let isVisible = (entry.intersectionRatio === 1);
 218                 toggleAnchorHighlighting(entry.target.id, isVisible);
 219             }
 220         }
 221
 222         function toggleAnchorHighlighting(elementId, shouldHighlight) {
 223             let anchorsToHighlight = pageNav.querySelectorAll('a[href="#' + elementId + '"]');
 224             for (let i = 0; i < anchorsToHighlight.length; i++) {
 225                 // Change below to use classList.toggle when IE support is dropped.
 226                 if (shouldHighlight) {
 227                     anchorsToHighlight[i].classList.add('current-heading');
 228                 } else {
 229                     anchorsToHighlight[i].classList.remove('current-heading');
 230                 }
 231             }
 232         }
 233     }
 234 }
 235
 236 export default PageDisplay;