From 15a382edbfe777dcd84c5bef7c661d910d92daff Mon Sep 17 00:00:00 2001
From: frankdelange <github-f@unternet.org>
Date: Tue, 28 Mar 2017 10:46:00 +0200
Subject: [PATCH] files_reader: more PDF changes, working outline,progress
 report, starting experiment with preloading next page(s)

---
 files_reader/.TODO.swp                        | Bin 0 -> 12288 bytes
 files_reader/TODO                             |   5 +-
 files_reader/templates/.pdfreader.php.swp     | Bin 0 -> 36864 bytes
 files_reader/templates/pdfreader.php          |  23 +-
 files_reader/vendor/pdfjs/.pdf.reader.js.swp  | Bin 0 -> 53248 bytes
 .../controllers/.outline_controller.js.swp    | Bin 0 -> 20480 bytes
 .../controllers/.progress_controller.js.swp   | Bin 0 -> 12288 bytes
 .../pdfjs/controllers/controls_controller.js  |  67 +++-
 .../pdfjs/controllers/outline_controller.js   | 164 ++++++++
 .../pdfjs/controllers/progress_controller.js  |  57 +++
 .../pdfjs/controllers/reader_controller.js    |   4 +-
 .../pdfjs/controllers/sidebar_controller.js   |   4 +-
 .../pdfjs/controllers/toc_controller.js       | 273 ++++++++-----
 files_reader/vendor/pdfjs/css/.main.css.swp   | Bin 0 -> 24576 bytes
 files_reader/vendor/pdfjs/css/main.css        |  54 +++
 files_reader/vendor/pdfjs/css/sidebar.css     |  39 +-
 files_reader/vendor/pdfjs/pdf.reader.js       | 377 +++++++++++++++---
 17 files changed, 890 insertions(+), 177 deletions(-)
 create mode 100644 files_reader/.TODO.swp
 create mode 100644 files_reader/templates/.pdfreader.php.swp
 create mode 100644 files_reader/vendor/pdfjs/.pdf.reader.js.swp
 create mode 100644 files_reader/vendor/pdfjs/controllers/.outline_controller.js.swp
 create mode 100644 files_reader/vendor/pdfjs/controllers/.progress_controller.js.swp
 create mode 100644 files_reader/vendor/pdfjs/controllers/outline_controller.js
 create mode 100644 files_reader/vendor/pdfjs/controllers/progress_controller.js
 create mode 100644 files_reader/vendor/pdfjs/css/.main.css.swp

diff --git a/files_reader/.TODO.swp b/files_reader/.TODO.swp
new file mode 100644
index 0000000000000000000000000000000000000000..cc6ba4cc16a8dabecbb2def234f273d75a191990
GIT binary patch
literal 12288
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D_N90R

literal 0
HcmV?d00001

diff --git a/files_reader/TODO b/files_reader/TODO
index b60fa73..51e72ed 100644
--- a/files_reader/TODO
+++ b/files_reader/TODO
@@ -1,11 +1,10 @@
- - index
  - search
  - bookmarks
  - annotations
  - settings
 
  - rtl and ltr
- - switch spread-page-width by key combo
 
  - test canvas size restriction
- - toggle zoom via keyboard
+
+ - add preload/postload of X pages around current position (optional), store resulting rendered pages in off-screen canvas?
diff --git a/files_reader/templates/.pdfreader.php.swp b/files_reader/templates/.pdfreader.php.swp
new file mode 100644
index 0000000000000000000000000000000000000000..c20a12cf260f5292d0a18d96957eb58661ffe059
GIT binary patch
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HcmV?d00001

diff --git a/files_reader/templates/pdfreader.php b/files_reader/templates/pdfreader.php
index f211454..2ae4298 100644
--- a/files_reader/templates/pdfreader.php
+++ b/files_reader/templates/pdfreader.php
@@ -48,11 +48,14 @@
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/sindresorhus/screenfull.js')) ?>?v=<?php p($version) ?>"> </script>
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/lib/pdf.js')) ?>?v=<?php p($version) ?>"> </script>
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/pdf.reader.js')) ?>?v=<?php p($version) ?>"> </script>
+		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/controllers/progress_controller.js')) ?>?v=<?php p($version) ?>"> </script>
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/controllers/textlayer_controller.js')) ?>?v=<?php p($version) ?>"> </script>
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/controllers/reader_controller.js')) ?>?v=<?php p($version) ?>"> </script>
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/controllers/sidebar_controller.js')) ?>?v=<?php p($version) ?>"> </script>
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/controllers/settings_controller.js')) ?>?v=<?php p($version) ?>"> </script>
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/controllers/controls_controller.js')) ?>?v=<?php p($version) ?>"> </script>
+		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/controllers/toc_controller.js')) ?>?v=<?php p($version) ?>"> </script>
+		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/controllers/outline_controller.js')) ?>?v=<?php p($version) ?>"> </script>
         <?php if ($idevice): ?>
         <link rel="stylesheet" href="<?php p($urlGenerator->linkTo('files_reader', 'vendor/pdfjs/css/idevice.css')) ?>?v=<?php p($version) ?>">
 		<script type="text/javascript" nonce="<?php p($nonce) ?>" src="<?php p($urlGenerator->linkTo('files_reader', 'vendor/bgrins/spectrum.js')) ?>?v=<?php p($version) ?>"> </script>
@@ -64,23 +67,41 @@
     <body>
         <div id="outerContainer">
 
+            <!-- progress -->
+
+            <div id="progress" class="hide">
+                <span class="progress"><span class="bar"></span></span>
+                <br>
+                <div class="message"><span class="message-icons"><span id="download_icon" class="icon-cloud_download"></span></span> <span class="message-text"></span></div>
+            </div>
+
+            <!-- /progress -->
+
             <!-- sidebar -->
 
             <div id="sidebar" class="sidebar">
                 <div id="panels" class="panels">
                     <div class="pull-left">
-                        <button id="show-Toc" class="show_view icon-format_list_numbered open" title="Table of Contents" data-view="Toc"></button>
+                        <button id="show-Toc" class="show_view icon-dns open" title="Table of Contents" data-view="Toc"></button>
+                        <button id="show-Outline" class="show_view icon-format_list_numbered" title="Outline" data-view="Outline"></button>
                         <button id="show-Bookmarks" class="show_view icon-turned_in" title="Bookmarks" data-view="Bookmarks"></button>
                         <button id="show-Search" class="show_view icon-search" title="Search" data-view="Search"></button>
                         <button id="show-Notes" class="show_view icon-comment" title="Notes" data-view="Notes"></button>
                         <button id="show-Settings" class="show_view icon-settings" title="Settings" data-view="Settings"></button>
                     </div>
                     <div class="pull-right">
+                        <button id="toc_populate" title="generate thumbnails" class="icon-sync" style="display:none"></button>
                         <button id="hide-Sidebar" class="close_sidebar icon-arrow-left2" title="Close sidebar"></button>
                     </div>
                 </div>
                 <div id="views">
                     <div id="tocView" class="toc-view view open">
+                        <ul id="toc">
+                        </ul>
+                    </div>
+                     <div id="outlineView" class="outline-view view">
+                        <ul id="outline" class="outline">
+                        </ul>
                     </div>
                     <div id="bookmarksView" class="bookmarks-view view">
                         <ul id="bookmarks" class="bookmarks">
diff --git a/files_reader/vendor/pdfjs/.pdf.reader.js.swp b/files_reader/vendor/pdfjs/.pdf.reader.js.swp
new file mode 100644
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diff --git a/files_reader/vendor/pdfjs/controllers/.outline_controller.js.swp b/files_reader/vendor/pdfjs/controllers/.outline_controller.js.swp
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diff --git a/files_reader/vendor/pdfjs/controllers/.progress_controller.js.swp b/files_reader/vendor/pdfjs/controllers/.progress_controller.js.swp
new file mode 100644
index 0000000000000000000000000000000000000000..b64e592e51a71857f7a8ea1d1341e3b0a7b35719
GIT binary patch
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diff --git a/files_reader/vendor/pdfjs/controllers/controls_controller.js b/files_reader/vendor/pdfjs/controllers/controls_controller.js
index 1bfe9c4..71a1d88 100644
--- a/files_reader/vendor/pdfjs/controllers/controls_controller.js
+++ b/files_reader/vendor/pdfjs/controllers/controls_controller.js
@@ -23,7 +23,8 @@ PDFJS.reader.ControlsController = function(book) {
         $rotate_option = $(".rotate_option"),
         $rotate_left = $("#rotate_left"),
         $rotate_right = $("#rotate_right"),
-        $page_num = $("#page_num");
+        $page_num = $("#page_num"),
+        $total_pages = $("#total_pages");
 
     if (reader.isMobile() === true) {
         $titlebar.addClass("background_visible");
@@ -136,6 +137,19 @@ PDFJS.reader.ControlsController = function(book) {
         $zoom_options.css("opacity", "");
     });
 
+    var setZoomIcon = function(zoom) {
+        $zoom_icon[0].className="";
+        var $current_zoom_option = $zoom_options.find("[data-value='" + zoom + "']");
+        if ($current_zoom_option.data("class")) {
+            $zoom_icon.addClass($current_zoom_option.data("class"));
+        } else {
+            $zoom_icon[0].textContent = $current_zoom_option.data("text");
+        }
+    };
+
+    setZoomIcon(settings.zoomLevel);
+
+    /*
     $zoom_icon[0].className="";
     var $current_zoom_option = $zoom_options.find("[data-value='" + settings.zoomLevel + "']");
     if ($current_zoom_option.data("class")) {
@@ -143,6 +157,7 @@ PDFJS.reader.ControlsController = function(book) {
     } else {
         $zoom_icon[0].textContent = $current_zoom_option.data("text");
     }
+    */
 
     $zoom_option.on("click", function () {
         var $this = $(this);
@@ -158,8 +173,12 @@ PDFJS.reader.ControlsController = function(book) {
     });
 
     // rotate
-    $rotate_icon[0].className = "";
-    $rotate_icon[0].className = "icon-rotate_" + settings.rotation;
+    var setRotateIcon = function (rotation) {
+        $rotate_icon[0].className = "";
+        $rotate_icon[0].className = "icon-rotate_" + rotation;
+    };
+
+    setRotateIcon(settings.rotation);
 
     $rotate_icon.on("click", function () {
         var offset = $(this).offset();
@@ -238,6 +257,42 @@ PDFJS.reader.ControlsController = function(book) {
         $page_num[0].addEventListener("keydown", enterPageNum, false);
     });
 
+    var setPageCount = function (_numPages) {
+
+        var numPages = _numPages || reader.settings.numPages;
+
+        $total_pages[0].textContent = parseInt(numPages).toString();
+    };
+
+    var setCurrentPage = function (_page) {
+
+        var page = _page || reader.settings.currentPage,
+            zoom = reader.settings.zoomLevel,
+            oddPageRight = reader.settings.oddPageRight,
+            total_pages = reader.settings.numPages,
+            text;
+
+        if (zoom === "spread") {
+             if (oddPageRight === true) {
+                 page -= page % 2;
+             } else {
+                 page -= (page + 1) % 2;
+             }
+        }
+
+        if (page >= 0 && page <= total_pages) {
+            if (page === total_pages) {
+                text = reader.getPageLabel(page);
+            } else if (page === 0) {
+                text = reader.getPageLabel(page + 1);
+            } else {
+                text = reader.getPageLabel(page) + "-" + reader.getPageLabel(page + 1);
+            }
+        }
+
+        $page_num[0].textContent = text;
+    };
+
 
     /*
     book.on('renderer:locationChanged', function(cfi){
@@ -273,6 +328,10 @@ PDFJS.reader.ControlsController = function(book) {
     return {
         "show": show,
         "hide": hide,
-        "toggle": toggle
+        "toggle": toggle,
+        "setZoomIcon": setZoomIcon,
+        "setRotateIcon": setRotateIcon,
+        "setCurrentPage": setCurrentPage,
+        "setPageCount": setPageCount
     };
 };
diff --git a/files_reader/vendor/pdfjs/controllers/outline_controller.js b/files_reader/vendor/pdfjs/controllers/outline_controller.js
new file mode 100644
index 0000000..229c9a8
--- /dev/null
+++ b/files_reader/vendor/pdfjs/controllers/outline_controller.js
@@ -0,0 +1,164 @@
+PDFJS.reader.OutlineController = function(_outline) {
+
+	var reader = this,
+        book = this.book,
+        outline = _outline || [];
+
+	var outlineView = document.getElementById("outlineView"),
+        $list = $("#outlineView"),
+        baseUrl = location.href.split('#')[0],
+        lastToggleIsShow;
+
+    var DEFAULT_TITLE = '\u2013';
+
+    var bindLink = function (element, item) {
+
+		var destination = item.dest;
+
+		if (item.url) {
+
+			PDFJS.addLinkAttributes (element, {
+				url: item.url,
+				target: (item.newWindow
+					? PDFJS.LinkTarget.BLANK
+					: undefined),
+			});
+
+			return;
+		} else {
+
+			element.href = getDestinationHash(destination);
+			element.onclick = function () {
+				if (destination) {
+					reader.navigateTo(destination);
+				}
+				
+				return false;
+			};
+		}
+	};
+
+	var setStyles = function (element, item) {
+	
+        var styleStr = "";
+
+        if (item.bold) {
+            styleStr += 'font-weight: bold;';
+        }
+
+        if (item.italic) {
+            styleStr += 'font-style: italic;';
+        }
+
+        if (styleStr) {
+            element.setAttribute('style', styleStr);
+        }
+    };
+
+	var getDestinationHash = function (destination) {
+
+		var url = baseUrl || "",
+			str;
+
+		if (typeof destination === 'string') {
+
+			url += "#"
+				+ (parseInt(destination) === destination)
+					? "nameddest="
+					: ""
+				+ escape(destination);
+
+		} else if (destination instanceof Array) {
+
+			url += "#"
+				+ escape(JSON.stringify(destination));
+		}
+
+		return url;
+	};
+
+    var generateOutlineItems = function (outline, level) {
+
+        var container = document.createElement("ul");
+
+        if(!level) level = 1;
+
+        outline.forEach(function (chapter) {
+            var listitem = document.createElement("li"),
+                link = document.createElement("a"),
+                toggle = document.createElement("a"),
+                subitems;
+
+            listitem.id = "outline-"+chapter.dest;
+            listitem.classList.add('list_item');
+
+            link.textContent = PDFJS.removeNullCharacters(chapter.title) || DEFAULT_TITLE;
+            bindLink(link, chapter);
+            setStyles(link, chapter);
+            link.classList.add('outline_link');
+
+            listitem.appendChild(link);
+
+            if(chapter.items.length > 0) {
+                level++;
+                subitems = generateOutlineItems(chapter.items, level);
+                toggle.classList.add('outline_toggle');
+                listitem.insertBefore(toggle, link);
+                listitem.appendChild(subitems);
+            }
+
+            container.appendChild(listitem);
+        });
+
+        return container;
+    }
+
+
+    console.log(outline);
+
+	var onShow = function() {
+        outlineView.classList.add('open');
+	};
+
+	var onHide = function() {
+        outlineView.classList.remove('open');
+	};
+
+	$list.append(generateOutlineItems(outline));
+
+    /*
+	$list.find(".outline_link").on("click", function(event){
+			var url = this.getAttribute('href');
+
+			event.preventDefault();
+
+			//-- Provide the Book with the url to show
+			//   The Url must be found in the books manifest
+			book.goto(url);
+
+			$list.find(".currentChapter")
+					.addClass("openChapter")
+					.removeClass("currentChapter");
+
+			$(this).parent('li').addClass("currentChapter");
+
+	});
+    */
+
+	$list.find(".outline_toggle").on("click", function(event){
+			var $el = $(this).parent('li'),
+					open = $el.hasClass("openChapter");
+
+			event.preventDefault();
+			if(open){
+				$el.removeClass("openChapter");
+			} else {
+				$el.addClass("openChapter");
+			}
+	});
+
+	return {
+		"show" : onShow,
+		"hide" : onHide
+	};
+};
diff --git a/files_reader/vendor/pdfjs/controllers/progress_controller.js b/files_reader/vendor/pdfjs/controllers/progress_controller.js
new file mode 100644
index 0000000..7ce3d4e
--- /dev/null
+++ b/files_reader/vendor/pdfjs/controllers/progress_controller.js
@@ -0,0 +1,57 @@
+PDFJS.reader.ProgressController = function() {
+    var reader = this,
+        settings = reader.settings,
+        percentage = 0;
+
+    var $progress = $("#progress"),
+        $bar = $(".bar"),
+        $download_icon = $("#download_icon"),
+        $message = $(".message-text");
+
+    var show = function () {
+        $progress.removeClass("hide");
+    };
+
+    var hide = function () {
+        $progress.addClass("hide");
+    };
+
+    var setSize = function (size) {
+        settings.fileSize = size;
+    };
+
+    var setProgress = function (progress) {
+
+        if (percentage < 1)
+            $download_icon.addClass("active");
+
+        percentage = Math.floor((progress.loaded / progress.total) * 100);
+        $bar.css("width", percentage + "%");
+
+        if (percentage === 100)
+            $download_icon.removeClass("active").addClass("ok");
+    };
+
+    var reset = function() {
+        $bar.css("width", 0);
+    };
+
+    var setMessage = function (text, category, state) {
+
+        var $category_icon = $("#" + category + "_icon");
+
+        $message.text(text);
+
+        $category_icon[0].classList.remove("ok", "active", "error");
+        $category_icon.addClass(state);
+    };
+
+
+    return {
+        "show": show,
+        "hide": hide,
+        "setSize": setSize,
+        "setProgress": setProgress,
+        "setMessage": setMessage
+    };
+};
diff --git a/files_reader/vendor/pdfjs/controllers/reader_controller.js b/files_reader/vendor/pdfjs/controllers/reader_controller.js
index 1a2a2f4..b2ab5a7 100644
--- a/files_reader/vendor/pdfjs/controllers/reader_controller.js
+++ b/files_reader/vendor/pdfjs/controllers/reader_controller.js
@@ -119,8 +119,8 @@ PDFJS.reader.ReaderController = function(book) {
             case 'rotateRight':
                 $rotate_right.click();
                 break;
-            case 'toggleZoom':
-                // TODO
+            case 'cycleZoom':
+                reader.cycleZoom();
                 break;
             default:
                 console.log("unsupported keyCode: " + e.keyCode);
diff --git a/files_reader/vendor/pdfjs/controllers/sidebar_controller.js b/files_reader/vendor/pdfjs/controllers/sidebar_controller.js
index 292a523..439851c 100644
--- a/files_reader/vendor/pdfjs/controllers/sidebar_controller.js
+++ b/files_reader/vendor/pdfjs/controllers/sidebar_controller.js
@@ -6,7 +6,7 @@ PDFJS.reader.SidebarController = function(book) {
         $panels = $("#panels"),
         $views = $("#views"),
         $close = $("#hide-Sidebar");
-    $slider = $("#slider");
+        $slider = $("#slider");
 
     var activePanel = "Toc";
 
@@ -62,6 +62,8 @@ PDFJS.reader.SidebarController = function(book) {
         e.preventDefault();
     });
 
+    $sidebar.css("width", "calc(" + parseInt(settings.thumbnailWidth) + "px + 2em)");
+
     return {
         'show' : show,
         'hide' : hide,
diff --git a/files_reader/vendor/pdfjs/controllers/toc_controller.js b/files_reader/vendor/pdfjs/controllers/toc_controller.js
index b46e70f..8d8c0b0 100644
--- a/files_reader/vendor/pdfjs/controllers/toc_controller.js
+++ b/files_reader/vendor/pdfjs/controllers/toc_controller.js
@@ -1,115 +1,192 @@
-PDFJS.reader.TocController = function(toc) {
-	var book = this.book;
+PDFJS.reader.TocController = function() {
 
-	var $list = $("#tocView"),
-			docfrag = document.createDocumentFragment();
+    var reader = this,
+	    book = this.book,
+        settings = reader.settings,
+        toc = document.getElementById("toc"),
+        tovView = document.getElementById("tocView"),
+        $toc_populate = $("#toc_populate"),
+        timeout;
 
-	var currentChapter = false;
+    var isVisible = function (element) {
 
-	var generateTocItems = function(toc, level) {
-		var container = document.createElement("ul");
+		var viewport = element.getBoundingClientRect(),
+			visible,
+            offset = settings.preloadOffset;
 
-		if(!level) level = 1;
+		visible = (
+			viewport.top  >= (0 - offset)
+				&& viewport.left >= (0 - offset)
+				&& viewport.right < (window.innerWidth + offset)
+				&& viewport.bottom < (window.innerHeight + offset)
+		);
 
-		toc.forEach(function(chapter) {
-			var listitem = document.createElement("li"),
-					link = document.createElement("a");
-					toggle = document.createElement("a");
-
-			var subitems;
-
-			listitem.id = "toc-"+chapter.id;
-			listitem.classList.add('list_item');
-
-			link.textContent = chapter.label;
-			link.href = chapter.href;
-
-			link.classList.add('toc_link');
-
-			listitem.appendChild(link);
-
-			if(chapter.subitems.length > 0) {
-				level++;
-				subitems = generateTocItems(chapter.subitems, level);
-				toggle.classList.add('toc_toggle');
-
-				listitem.insertBefore(toggle, link);
-				listitem.appendChild(subitems);
-			}
-
-
-			container.appendChild(listitem);
-
-		});
-
-		return container;
+        return visible;
 	};
 
+	var lazyLoad = function () {
+
+		var elements = toc.querySelectorAll('img[data-pagenum]'),
+			pagenum,
+            count;
+
+		for (var i = 0; i < elements.length; i++) {
+			if (isVisible(elements[i])) {
+				pagenum = elements[i].getAttribute("data-pagenum");
+				elements[i].removeAttribute("data-pagenum");
+				reader.getThumb(pagenum, true);
+                count++;
+			}
+		}
+
+        if (!elements.length || count === elements.length ) {
+            removeLazyLoader(tocView);
+        }
+	};
+
+    var lazyLoader = function () {
+        timeout = setTimeout( function () {
+            lazyLoad();
+        }, settings.lazyDelay);
+    };
+
+    var addLazyLoader = function (_element) {
+
+        var element = _element || window;
+
+        element.addEventListener("scroll", lazyLoader, false);
+        element.addEventListener("load", lazyLoader, false);
+    };
+
+    var removeLazyLoader = function (_element) {
+
+        var element = _element || window;
+
+        element.removeEventListener("scroll", lazyLoader);
+        element.removeEventListener("load", lazyLoader);
+    };
+
+    var tocCreate = function (no_pages, width, height, populate) {
+        
+        var canvas = document.createElement("canvas"),
+            ctx = canvas.getContext("2d"),
+            aspect,
+            imgsrc,
+            preloadcount,
+            scale,
+            timeout;
+
+        aspect = parseFloat(width / height);
+
+        // create small placeholder image
+        canvas.width = 10;
+        canvas.height = parseInt(canvas.width / aspect);
+
+        placeholder_width = reader.settings.thumbnailWidth;
+        placeholder_height = parseInt(reader.settings.thumbnailWidth / aspect);
+
+        // fill with transparent black, style in CSS
+        ctx.fillStyle = "rgba(0, 0, 0, 0)";
+        ctx.fillRect(0, 0, canvas.width, canvas.height);
+        imgsrc = canvas.toDataURL();
+
+        for(var i = 0; i < no_pages; i++) {
+            var item = document.createElement('li'),
+                placeholder = new Image(),
+                label = document.createElement('span'),
+                page_label = reader.pageLabels[i + 1];
+
+            item.setAttribute("id", "page_" + parseInt(i + 1));
+            placeholder.src = imgsrc;
+            placeholder.style.width = reader.settings.thumbnailWidth;
+            placeholder.style.height = parseInt(reader.settings.thumbnailWidth / aspect);
+            placeholder.classList.add("placeholder");
+            label.innerHTML = page_label || (i + 1).toString();
+            label.classList.add("page_label");
+            //label.style.left = width;
+            item.appendChild(placeholder);
+            item.appendChild(label);
+            toc.appendChild(item);
+            if (populate) {
+                reader.getThumb(i + 1, true);
+            } else {
+                placeholder.setAttribute("data-pagenum", parseInt(i + 1));
+            }
+        }
+
+        if (!populate) {
+
+            // preload first screenfull of thumbnails
+            scale = parseFloat(settings.thumbnailWidth / width);
+            preloadcount = parseInt(window.innerHeight / placeholder_height) + 2;
+            if (preloadcount > settings.numPages)
+                preloadcount = numPages;
+
+            var _timeout = setTimeout(function () {
+                for (var i = 1; i <= preloadcount; i++) {
+                    reader.getThumb(i, true);
+                }
+            }, settings.initialLazyDelay);
+        }
+    };
+
+    var tocInsert = function (image, page, replace) {
+        var placeholder = toc.children[page - 1].firstChild;
+        if (replace === true) {
+            placeholder.parentNode.replaceChild(image, placeholder);
+        }
+
+        toc.children[page - 1].addEventListener('click', function (e) {
+            reader.queuePage(page);
+        });
+    };
+
+    var tocPopulate = function () {
+        var i = 0;
+        while (i < reader.settings.numPages) {
+            reader.getThumb(i, true);
+            i++;
+        }
+
+        reader.thumbnails = true;
+        $toc_populate.addClass("hide");
+		remove_lazy_loader();
+    };
+
+    if (!settings.thumbnails) {
+        addLazyLoader(tocView);
+    }
+
+    reader.book.getPage(1).then(function(page) {
+        var width,
+            height,
+            viewport,
+            page_rotation,
+            rotation;
+
+        page_rotation = page.rotate;
+        rotation = (page_rotation + reader.settings.rotation) % 360;
+
+        viewport = page.getViewport(1, rotation);
+
+        width = viewport.width;
+        height = viewport.height;
+
+        tocCreate(settings.numPages, width, height, settings.thumbnails);
+    });
+
 	var onShow = function() {
-        $list.addClass('open');
+        tocView.classList.add('open');
 	};
 
 	var onHide = function() {
-        $list.removeClass('open');
+        tocView.classList.remove('open');
 	};
 
-	var chapterChange = function(e) {
-		var id = e.id,
-				$item = $list.find("#toc-"+id),
-				$current = $list.find(".currentChapter"),
-				$open = $list.find('.openChapter');
-
-		if($item.length){
-
-			if($item != $current && $item.has(currentChapter).length > 0) {
-				$current.removeClass("currentChapter");
-			}
-
-			$item.addClass("currentChapter");
-
-			// $open.removeClass("openChapter");
-			$item.parents('li').addClass("openChapter");
-		}
-	};
-
-	book.on('renderer:chapterDisplayed', chapterChange);
-
-	var tocitems = generateTocItems(toc);
-
-	docfrag.appendChild(tocitems);
-
-	$list.append(docfrag);
-	$list.find(".toc_link").on("click", function(event){
-			var url = this.getAttribute('href');
-
-			event.preventDefault();
-
-			//-- Provide the Book with the url to show
-			//   The Url must be found in the books manifest
-			book.goto(url);
-
-			$list.find(".currentChapter")
-					.addClass("openChapter")
-					.removeClass("currentChapter");
-
-			$(this).parent('li').addClass("currentChapter");
-
-	});
-
-	$list.find(".toc_toggle").on("click", function(event){
-			var $el = $(this).parent('li'),
-					open = $el.hasClass("openChapter");
-
-			event.preventDefault();
-			if(open){
-				$el.removeClass("openChapter");
-			} else {
-				$el.addClass("openChapter");
-			}
-	});
-
 	return {
 		"show" : onShow,
-		"hide" : onHide
+		"hide" : onHide,
+        "tocInsert": tocInsert,
+        "totPopulate": tocPopulate
 	};
 };
diff --git a/files_reader/vendor/pdfjs/css/.main.css.swp b/files_reader/vendor/pdfjs/css/.main.css.swp
new file mode 100644
index 0000000000000000000000000000000000000000..500883336e19765589cc8636ebfd9ec8ad9d8f62
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diff --git a/files_reader/vendor/pdfjs/css/main.css b/files_reader/vendor/pdfjs/css/main.css
index 5be07dc..f3311ce 100644
--- a/files_reader/vendor/pdfjs/css/main.css
+++ b/files_reader/vendor/pdfjs/css/main.css
@@ -210,6 +210,7 @@ body {
     display: flex;
     align-items: center;
     justify-content: center;
+    overflow: hidden;
 }
 
 #viewer canvas {
@@ -336,6 +337,59 @@ body {
     opacity: 0 !important;
 }
 
+/* progressbar (loading/unarchiving) */
+
+#progress {
+	position: fixed;
+	z-index: 10;
+	width: 100%;
+}
+
+.progress, .bar {
+    width: 100%;
+    height: 0.3em;
+    margin: 0;
+    padding: 0;
+    display: inline-block;
+}
+.progress {
+    border: none;
+}
+.bar {
+    width: 0;
+    background-color: red;
+    box-shadow: 0px 1px 3px rgba(0,0,0,.6);
+}
+
+.message {
+    margin: 3em;
+}
+
+.message-icons {
+    font-size: 3em;
+    color: lightgrey;
+    vertical-align: middle;
+}
+.message-text {
+    font-size: 1.5em;
+    color: black;
+}
+
+.active {
+    color:black;
+}
+
+.ok {
+    color:green;
+}
+
+.error {
+    color:red;
+}
+
+/* END progressbar */
+
+
 @media only screen and (max-width: 1040px) {
 /*
   #viewer{
diff --git a/files_reader/vendor/pdfjs/css/sidebar.css b/files_reader/vendor/pdfjs/css/sidebar.css
index 2fad6c0..5b43d7f 100644
--- a/files_reader/vendor/pdfjs/css/sidebar.css
+++ b/files_reader/vendor/pdfjs/css/sidebar.css
@@ -9,7 +9,7 @@
   background: #6b6b6b;
   position: fixed;
   top: 0;
-  min-width: 25em;
+  min-width: 17em;
   height: 100%;
   overflow: hidden;
   display: none;
@@ -231,7 +231,28 @@ legend {
 /* END panels */
 
 /* TOC (and search, and bookmarks) */
-.toc_toggle {
+.thumbnail {
+	margin: 1em;
+}
+
+#toc li,
+#outline li{
+	position: relative;
+    display: inline-block;
+    /* max-width: calc(100% - 2em); */
+}
+
+.page_label {
+	position: absolute;
+	background-color: white;
+	box-shadow: 1px 1px 10px rgba(0,0,0,0.5);
+	border-radius: 3px;
+	padding: 0.2em;
+    top: 1em;
+    right: 1em;
+}
+
+.outline_toggle {
   display: inline-block;
   width: 14px;
   cursor: pointer;
@@ -240,23 +261,23 @@ legend {
   user-select: none;
 }
 
-.toc_toggle:before {
+.outline_toggle:before {
   content: '▸';
   color: #fff;
   margin-right: -4px;
 }
 
-.currentChapter > .toc_toggle:before,
-.openChapter > .toc_toggle:before {
+.currentChapter > .outline_toggle:before,
+.openChapter > .outline_toggle:before {
   content: '▾';
 }
 
-#toc-populate.open {
+#outline-populate.open {
     display: inline-block !important;
     background-color: #4e4e4e;
 }
 
-.toc-view li,
+.outline-view li,
 .bookmarks-view li,
 .search-view li {
 	margin: 1em;
@@ -264,11 +285,11 @@ legend {
 	list-style: none;
 }
 
-.toc-view li {
+.outline-view li {
 	text-transform: capitalize;
 }
 
-.toc-vew.hidden {
+.outline-vew.hidden {
   display: none;
 }
 
diff --git a/files_reader/vendor/pdfjs/pdf.reader.js b/files_reader/vendor/pdfjs/pdf.reader.js
index 8d37bba..dafade0 100644
--- a/files_reader/vendor/pdfjs/pdf.reader.js
+++ b/files_reader/vendor/pdfjs/pdf.reader.js
@@ -17,11 +17,16 @@ PDFJS.Reader = function(bookPath, _options) {
 
     var reader = this,
         book,
+        loader,
         $viewer = $("#viewer"),
         search = window.location.search;
 
-    var TEXT_RENDER_DELAY = 200,  // ms
-        PAGE_RENDER_DELAY = 200,  // ms
+    var TEXT_RENDER_DELAY = 200,    // ms
+        PAGE_RENDER_DELAY = 200,    // ms
+        LAZY_DELAY = 200,           // ms
+        INITIAL_LAZY_DELAY = 2000,  // ms
+        PRELOAD_OFFSET = 500,       // px
+        THUMBNAIL_WIDTH = 200,      // px
         MAX_CANVAS_PIXELS = 5242880,
         CSS_UNITS = 96.0 / 72.0,
         MIN_SCALE = 0.25,
@@ -42,6 +47,11 @@ PDFJS.Reader = function(bookPath, _options) {
         oddPageRight: true, // when true, odd pages render on the right side
         zoomLevel: window.outerWidth > window.outerHeight ? "spread" : "fit_page",  // spread, fit_page, fit_width, percentage
         rotation: 0,    // 0 || 90 || 180 || 270 
+        thumbnails: false,  // true || false, show thumbnails (visual index)
+        thumbnailWidth: THUMBNAIL_WIDTH,
+        lazyDelay: LAZY_DELAY,     // ms, delay before lazyloader loads image
+        initialLazyDelay: INITIAL_LAZY_DELAY,  // ms, delay before preloading images for lazyloader
+        preloadOffset: PRELOAD_OFFSET,  // px, preload thumbs when they are within this distance from viewport
         history: true,
         keyboard: {
             32: 'next',         // space
@@ -55,7 +65,7 @@ PDFJS.Reader = function(bookPath, _options) {
             66: 'bookmark',     // b
             76: 'rotateLeft',   // l
             82: 'rotateRight',  // r
-            90: 'toggleZoom',   // z
+            90: 'cycleZoom',    // z
             83: 'toggleSidebar',// s
             84: 'toggleTitlebar',   // t
             68: 'toggleDay',    // d
@@ -75,7 +85,7 @@ PDFJS.Reader = function(bookPath, _options) {
 
     // used for annotations and bookmarks
     this.Annotation = function (type, anchor, body, id) {
-        this.id = id || EPUBJS.core.uuid();
+        this.id = id || PDFJS.core.uuid();
         this.type = type;
         this.date = Date.now();
         this.edited = this.date;
@@ -96,6 +106,9 @@ PDFJS.Reader = function(bookPath, _options) {
             canvas: document.getElementById("left"),
             ctx: document.getElementById("left").getContext('2d'),
             textdiv: document.getElementById("text_left"),
+            cache_canvas: null,
+            cache_ctx: null,
+            cache_textdiv: null,
             textLayer: null,
             renderTask: null,
             oscanvas: null,
@@ -106,6 +119,9 @@ PDFJS.Reader = function(bookPath, _options) {
             canvas: document.getElementById("right"),
             ctx: document.getElementById("right").getContext('2d'),
             textdiv: document.getElementById("text_right"),
+            cache_canvas: null,
+            cache_ctx: null,
+            cache_textdiv: null,
             textLayer: null,
             renderTask: null,
             oscanvas: null,
@@ -118,6 +134,19 @@ PDFJS.Reader = function(bookPath, _options) {
 
     this.renderQueue = false;
 
+    // define which zoom states to cycle through in cycleZoom
+    this.zoomCycle = {
+        'spread':   'fit_page',
+        'fit_page': 'fit_width',
+        'fit_width':'spread'
+    };
+
+    this.thumbs = [];
+
+    this.pageLabels = [];
+
+    this.pageRefs = {};
+
     // Overide options with search parameters
     if(search) {
         parameters = search.slice(1).split("&");
@@ -142,53 +171,193 @@ PDFJS.Reader = function(bookPath, _options) {
     this.MIN_SCALE = MIN_SCALE;
     this.MAX_SCALE = MAX_SCALE;
 
- 	PDFJS.getDocument(reader.settings.bookPath).then(function(_book) {
-		reader.book = book = _book;
-        console.log(book);
-        reader.settings.numPages = reader.book.numPages;
-        document.getElementById('total_pages').textContent = reader.settings.numPages;
-        if(reader.settings.session.cursor !== {}) {
-            reader.settings.currentPage = parseInt(reader.settings.session.cursor.anchor);
+    reader.ProgressController = PDFJS.reader.ProgressController.call(reader);
+
+    loadingTask = PDFJS.getDocument(reader.settings.bookPath);
+
+    reader.ProgressController.show();
+    reader.ProgressController.setMessage("Loading " + reader.settings.session.title, "download", "active");
+
+    loadingTask.onProgress = function getDocumentProgress(progress) {
+        reader.ProgressController.setProgress(progress);
+    };
+
+    loadingTask.then(
+
+        function(_book) {
+            reader.book = book = _book;
+            console.log(book);
+            reader.settings.numPages = reader.book.numPages;
+            document.getElementById('total_pages').textContent = reader.settings.numPages;
+            if(!$.isEmptyObject(reader.settings.session.cursor)) {
+                console.log("setting cursor:", reader.settings.session.cursor);
+                reader.settings.currentPage = parseInt(reader.settings.session.cursor.anchor);
+            }
+
+            // set labels
+            reader.book.getPageLabels().then(function (labels) {
+                if (labels) {
+                    for (var i = 0; i < labels.length; i++) {
+                        if (labels[i] !== (i + 1).toString()) {
+                            reader.pageLabels[i + 1] = labels[i];
+                        }
+                    }
+                }
+            });
+
+            reader.ReaderController = PDFJS.reader.ReaderController.call(reader, book);
+            reader.SettingsController = PDFJS.reader.SettingsController.call(reader, book);
+            reader.ControlsController = PDFJS.reader.ControlsController.call(reader, book);
+            reader.SidebarController = PDFJS.reader.SidebarController.call(reader, book);
+
+            reader.queuePage(reader.settings.currentPage);
+            reader.ReaderController.hideLoader();
+            reader.ProgressController.hide();
+
+            reader.book.getOutline().then(function (outline) {
+                reader.OutlineController = PDFJS.reader.OutlineController.call(reader, outline);
+            }); 
+            reader.book.getMetadata().then(function (metadata) {
+                console.log("metadata", metadata);
+                reader.settings.pdfMetadata = metadata;
+            });
+            reader.book.getAttachments().then(function (attachments) {
+                console.log("attachments", attachments);
+            });
+
+            // BookmarksController depends on NotesController so load NotesController first
+            //reader.NotesController = PDFJS.reader.NotesController.call(reader, book);
+            //reader.BookmarksController = PDFJS.reader.BookmarksController.call(reader, book);
+            //reader.SearchController = PDFJS.reader.SearchController.call(reader, book);
+            //reader.MetaController = PDFJS.reader.MetaController.call(reader, meta);
+            reader.TocController = PDFJS.reader.TocController.call(reader, book);
+        },
+        function getDocumentError(exception) {
+            var message = exception && exception.message;
+            var errormsg = "An error occurred while loading the PDF";
+            if (exception instanceof PDFJS.InvalidPDFException) {
+                                errormsg = "Invalid or corrupted PDF file";
+                            } else if (exception instanceof PDFJS.MissingPDFException) {
+                                errormsg = "Missing PDF file";
+                            } else if (exception instanceof PDFJS.UnexpectedResponseException) {
+                                errormsg = "Unexpected server response";
+                            }
+
+            console.log("Reader: ", errormsg);
+            reader.ProgressController.setMessage(errormsg, "download", "error");
         }
-
-		reader.ReaderController = PDFJS.reader.ReaderController.call(reader, book);
-		reader.SettingsController = PDFJS.reader.SettingsController.call(reader, book);
-		reader.ControlsController = PDFJS.reader.ControlsController.call(reader, book);
-		reader.SidebarController = PDFJS.reader.SidebarController.call(reader, book);
-		// BookmarksController depends on NotesController so load NotesController first
-		//reader.NotesController = PDFJS.reader.NotesController.call(reader, book);
-		//reader.BookmarksController = PDFJS.reader.BookmarksController.call(reader, book);
-		//reader.SearchController = PDFJS.reader.SearchController.call(reader, book);
-		//reader.MetaController = EPUBJS.reader.MetaController.call(reader, meta);
-		//reader.TocController = EPUBJS.reader.TocController.call(reader, toc);
-	    //reader.TextLayerController = PDFJS.reader.TextLayerController();	
-
-        //reader.queuePage(reader.settings.currentPage);
-        console.log(reader.settings);
-        var startPage = (reader.settings.zoomLevel === "spread" && reader.settings.oddPageRight) ? 0 : 1;
-        reader.queuePage(startPage);
-		reader.ReaderController.hideLoader();
-    });
+    );
 
 	return this;
 };
 
+PDFJS.Reader.prototype.getThumb = function (pageNum, insert) {
+
+    var reader = this,
+        thumb,
+        scale,
+        initial_viewport,
+        viewport,
+        canvas,
+        ctx,
+        page_aspect,
+        page_width,
+        page_height,
+        page_rotation,
+        rotation,
+        outputscale,
+        transform,
+        renderContext,
+        renderTask;
+
+    reader.book.getPage(parseInt(pageNum)).then(function(page) {
+        page_rotation = page.rotate;
+        rotation = (page_rotation + reader.settings.rotation) % 360;
+        initial_viewport = page.getViewport(1, rotation);
+        canvas = document.createElement("canvas");
+        ctx = canvas.getContext("2d");
+        outputscale = reader.getOutputScale(ctx);
+        if (outputscale < 1)
+            outputscale = 1;    // ignore browser zoom
+        page_width = initial_viewport.width;
+        page_height = initial_viewport.height;
+        page_aspect = parseFloat(page_width / page_height);
+        scale = parseFloat(reader.settings.thumbnailWidth / page_width);
+        canvas.width = parseInt(reader.settings.thumbnailWidth * outputscale);
+        canvas.height = parseInt(canvas.width / page_aspect);
+
+        viewport = initial_viewport.clone({scale: scale, rotation: rotation});
+
+        //ctx.scale(outputscale, outputscale);
+        transform = (outputscale === 1)
+            ? null
+            : [outputscale, 0, 0, outputscale, 0, 0];
+
+        console.log("thumbs, canvas w*h " + canvas.width + "*" + canvas.height);
+
+        renderContext = {
+            canvasContext: ctx,
+            viewport: viewport,
+            transform: transform
+        };
+
+        renderTask = page.render(renderContext);
+
+        renderTask.promise.then(
+            function pdfPageRenderCallback () {
+                thumb = new Image();
+                thumb.id = "thumb_" + pageNum;
+                thumb.className = "thumbnail";
+                thumb.src = canvas.toDataURL();
+                canvas.width = canvas.height = 0;
+                delete canvas;
+                if (insert) {
+                    reader.TocController.tocInsert(thumb, pageNum, true);
+                } else {
+                    reader.thumbs[pageNum] = thumb;
+                }
+            },
+            function pdfPageRenderError (error) {
+                console.log("pdfPageRenderError in getThumb: " + error);
+            }
+        );
+    });
+};
+
 PDFJS.Reader.prototype.setZoom = function(zoom) {
     
     var reader = this,
         page = reader.settings.currentPage;
 
     reader.settings.zoomLevel = zoom;
+    reader.ControlsController.setZoomIcon(zoom);
     reader.queuePage(page);
 };
 
+PDFJS.Reader.prototype.cycleZoom = function() {
+
+    var reader = this,
+        zoom = reader.settings.zoomLevel,
+        nextzoom,
+        page = reader.settings.currentPage;
+
+    nextzoom = reader.zoomCycle[zoom];
+
+    if (nextzoom !== undefined) {
+        reader.setZoom(nextzoom);
+    }
+};
+
 PDFJS.Reader.prototype.setRotation = function (rotation) {
 
     var reader = this,
         page = reader.settings.currentPage;
 
-    reader.settings.rotation = rotation;
-    reader.queuePage(page);
+    if (rotation % 90 === 0) {
+        reader.settings.rotation = rotation;
+        reader.ControlsController.setRotateIcon(rotation);
+        reader.queuePage(page);
+    }
 };
 
 PDFJS.Reader.prototype.cancelRender = function (index) {
@@ -209,11 +378,10 @@ PDFJS.Reader.prototype.cancelRender = function (index) {
     }
 };
 
-PDFJS.Reader.prototype.renderPage = function(pageNum) {
+PDFJS.Reader.prototype.renderPage = function(pageNum, cache_result) {
 
     var reader = this,
-        $viewer = $("#viewer"),
-        $page_num = document.getElementById('page_num');
+        $viewer = $("#viewer");
 
     var index,
     	canvas,     // actual canvas
@@ -343,7 +511,7 @@ PDFJS.Reader.prototype.renderPage = function(pageNum) {
                         canvas.width = reader.roundToDivide(parseInt(canvas.height * document_aspect), fraction[0]);
                     } else {
                         scale = scale_width;
-                        canvas.width = reader.roundToDivide(max_view_width * outputscale, fraction[0])
+                        canvas.width = reader.roundToDivide(max_view_width * outputscale, fraction[0]);
                         canvas.height = reader.roundToDivide(parseInt(canvas.width / document_aspect), fraction[0]);
                     }
 
@@ -359,7 +527,7 @@ PDFJS.Reader.prototype.renderPage = function(pageNum) {
                         canvas.width = reader.roundToDivide(parseInt(canvas.height * document_aspect), fraction[0]);
                     } else {
                         scale = scale_width;
-                        canvas.width = reader.roundToDivide(max_view_width * outputscale, fraction[0])
+                        canvas.width = reader.roundToDivide(max_view_width * outputscale, fraction[0]);
                         canvas.height = reader.roundToDivide(parseInt(canvas.width / document_aspect), fraction[0]);
                     }
 
@@ -369,7 +537,7 @@ PDFJS.Reader.prototype.renderPage = function(pageNum) {
 
                     $viewer.removeClass("flex");
                     scale = parseFloat(reader.settings.zoomLevel * reader.CSS_UNITS);
-                    canvas.width = reader.roundToDivide(parseInt(page_width * scale * outputscale), fraction[0]); ;
+                    canvas.width = reader.roundToDivide(parseInt(page_width * scale * outputscale), fraction[0]);
                     canvas.height = reader.roundToDivide(parseInt(page_height * scale * outputscale), fraction[0]);
                     break;
             }
@@ -486,21 +654,15 @@ PDFJS.Reader.prototype.renderPage = function(pageNum) {
             canvas.style.width = reader.roundToDivide(max_view_width, fraction[1]) + 'px';
             canvas.style.height = reader.roundToDivide(max_view_height, fraction[1]) + 'px';
         }
-        // resizing clears canvas so this is not needed...
-        //ctx.clearRect(0, 0, canvas.width, canvas.height);
     }
 };
 
 PDFJS.Reader.prototype.queuePage = function(page) {
     
-	//var pageShift = (this.settings.zoomLevel === "spread") ? 2 : 1;
-    //
     var reader = this,
         zoom = reader.settings.zoomLevel,
         oddPageRight = reader.settings.oddPageRight,
-        pageShift,
-        $page_num = document.getElementById('page_num'),
-        text;
+        pageShift;
 
     if (zoom === "spread") {
         pageShift = 2;
@@ -512,26 +674,14 @@ PDFJS.Reader.prototype.queuePage = function(page) {
 
         console.log("page: " + page);
 
-        if (page >= 0 && page <= reader.settings.numPages) {
-            if (page === reader.settings.numPages) {
-                text = page.toString();
-            } else if (page === 0) {
-                text = "1";
-            } else {
-                text = page.toString() + "-" + parseInt(page+1).toString();
-            }
-
-            $page_num.textContent = text;
-        }
-
     } else {
         pageShift = 1;
-        if (page >= 1 && page <= reader.settings.numPages)
-            $page_num.textContent = page.toString();
     }
 
     reader.settings.currentPage = page;
 
+    reader.ControlsController.setCurrentPage(page);
+
     if (typeof reader.renderQueue === 'number') {
         window.clearTimeout(reader.renderQueue);
         reader.renderQueue = false;
@@ -674,3 +824,112 @@ PDFJS.Reader.prototype.isMobile = function () {
 
     return isMobile;
 };
+
+PDFJS.Reader.prototype.getPageLabel = function (page) {
+
+    var reader = this;
+
+    if (reader.pageLabels[parseInt(page)] !== undefined) {
+        return reader.pageLabels[parseInt(page)].toString();
+    } else {
+        return page.toString();
+    }
+};
+
+PDFJS.Reader.prototype.navigateTo = function (destination) {
+
+    var reader = this,
+        destString = "",
+        destinationPromise,
+        goToDestination;
+
+    goToDestination = function (destRef) {
+
+        var pageNumber;
+
+        if (destRef instanceof Object) {
+
+            pageNumber = reader.cachedPageNum(destRef);
+        } else if ((destRef | 0) === destRef) { // Integer
+            pageNumber = destRef + 1;
+        } else {
+            console.error('PDFJS.Reader.navigateTo: "' + destRef
+                + '" is not a valid destination reference.');
+
+            return;
+        }
+
+        if (pageNumber) {
+
+            if (pageNumber < 1 || pageNumber > reader.settings.numPages) {
+                console.error('PDFJS.Reader.navigateTo: "' + pageNumber
+                    + '" is a non-existent page number.');
+
+                return;
+            }
+
+            reader.queuePage(pageNumber);
+
+        } else {
+            
+            reader.book.getPageIndex(destRef).then(function (pageIndex) {
+
+                reader.cachePageRef(pageIndex + 1, destRef);
+                goToDestination(destRef);
+            }).catch(function () {
+                console.error('PDFJS.Reader.navigateTo: "' + destRef
+                    + '" is not a valid page reference.');
+
+                return;
+            });
+        }
+    };
+
+    if (typeof destination === 'string') {
+
+        destString = destination;
+        destinationPromise = reader.book.getDestination(destination);
+
+    } else {
+
+        destinationPromise = Promise.resolve(destination);
+
+    }
+
+    destinationPromise.then(function (_destination) {
+
+        destination = _destination;
+
+        if (!(destination instanceof Array)) {
+
+            console.error('PDFJS.Reader.navigateTo: "' + destination
+                + '" is not a valid destination array.');
+
+            return;
+        }
+
+        goToDestination(destination[0]);
+
+    });
+};
+
+PDFJS.Reader.prototype.pageRefStr = function (pageRef) {
+
+    return pageRef.num + ' ' + pageRef.gen + ' R';
+};
+
+PDFJS.Reader.prototype.cachePageRef = function (pageNum, pageRef) {
+
+    var reader = this,
+        refStr;
+
+    reader.pageRefs[reader.pageRefStr(pageRef)] = pageNum;
+};
+
+PDFJS.Reader.prototype.cachedPageNum = function (pageRef) {
+
+    var reader = this;
+
+    return (reader.pageRefs[reader.pageRefStr(pageRef)])
+        || null;
+};