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files_reader: more PDF changes, working outline,progress report, starting experiment with preloading next page(s)
This commit is contained in:
frankdelange
parent
c62859820d
commit
15a382edbf
17 changed files with 890 additions and 177 deletions
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@ -1,115 +1,192 @@
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PDFJS.reader.TocController = function(toc) {
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var book = this.book;
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PDFJS.reader.TocController = function() {
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var $list = $("#tocView"),
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docfrag = document.createDocumentFragment();
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var reader = this,
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book = this.book,
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settings = reader.settings,
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toc = document.getElementById("toc"),
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tovView = document.getElementById("tocView"),
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$toc_populate = $("#toc_populate"),
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timeout;
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var currentChapter = false;
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var isVisible = function (element) {
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var generateTocItems = function(toc, level) {
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var container = document.createElement("ul");
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var viewport = element.getBoundingClientRect(),
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visible,
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offset = settings.preloadOffset;
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if(!level) level = 1;
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visible = (
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viewport.top >= (0 - offset)
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&& viewport.left >= (0 - offset)
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&& viewport.right < (window.innerWidth + offset)
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&& viewport.bottom < (window.innerHeight + offset)
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);
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toc.forEach(function(chapter) {
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var listitem = document.createElement("li"),
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link = document.createElement("a");
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toggle = document.createElement("a");
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var subitems;
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listitem.id = "toc-"+chapter.id;
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listitem.classList.add('list_item');
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link.textContent = chapter.label;
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link.href = chapter.href;
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link.classList.add('toc_link');
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listitem.appendChild(link);
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if(chapter.subitems.length > 0) {
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level++;
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subitems = generateTocItems(chapter.subitems, level);
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toggle.classList.add('toc_toggle');
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listitem.insertBefore(toggle, link);
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listitem.appendChild(subitems);
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}
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container.appendChild(listitem);
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});
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return container;
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return visible;
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};
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var lazyLoad = function () {
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var elements = toc.querySelectorAll('img[data-pagenum]'),
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pagenum,
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count;
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for (var i = 0; i < elements.length; i++) {
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if (isVisible(elements[i])) {
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pagenum = elements[i].getAttribute("data-pagenum");
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elements[i].removeAttribute("data-pagenum");
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reader.getThumb(pagenum, true);
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count++;
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}
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}
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if (!elements.length || count === elements.length ) {
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removeLazyLoader(tocView);
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}
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};
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var lazyLoader = function () {
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timeout = setTimeout( function () {
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lazyLoad();
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}, settings.lazyDelay);
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};
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var addLazyLoader = function (_element) {
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var element = _element || window;
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element.addEventListener("scroll", lazyLoader, false);
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element.addEventListener("load", lazyLoader, false);
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};
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var removeLazyLoader = function (_element) {
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var element = _element || window;
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element.removeEventListener("scroll", lazyLoader);
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element.removeEventListener("load", lazyLoader);
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};
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var tocCreate = function (no_pages, width, height, populate) {
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var canvas = document.createElement("canvas"),
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ctx = canvas.getContext("2d"),
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aspect,
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imgsrc,
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preloadcount,
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scale,
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timeout;
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aspect = parseFloat(width / height);
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// create small placeholder image
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canvas.width = 10;
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canvas.height = parseInt(canvas.width / aspect);
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placeholder_width = reader.settings.thumbnailWidth;
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placeholder_height = parseInt(reader.settings.thumbnailWidth / aspect);
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// fill with transparent black, style in CSS
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ctx.fillStyle = "rgba(0, 0, 0, 0)";
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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imgsrc = canvas.toDataURL();
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for(var i = 0; i < no_pages; i++) {
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var item = document.createElement('li'),
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placeholder = new Image(),
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label = document.createElement('span'),
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page_label = reader.pageLabels[i + 1];
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item.setAttribute("id", "page_" + parseInt(i + 1));
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placeholder.src = imgsrc;
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placeholder.style.width = reader.settings.thumbnailWidth;
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placeholder.style.height = parseInt(reader.settings.thumbnailWidth / aspect);
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placeholder.classList.add("placeholder");
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label.innerHTML = page_label || (i + 1).toString();
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label.classList.add("page_label");
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//label.style.left = width;
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item.appendChild(placeholder);
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item.appendChild(label);
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toc.appendChild(item);
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if (populate) {
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reader.getThumb(i + 1, true);
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} else {
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placeholder.setAttribute("data-pagenum", parseInt(i + 1));
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}
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}
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if (!populate) {
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// preload first screenfull of thumbnails
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scale = parseFloat(settings.thumbnailWidth / width);
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preloadcount = parseInt(window.innerHeight / placeholder_height) + 2;
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if (preloadcount > settings.numPages)
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preloadcount = numPages;
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var _timeout = setTimeout(function () {
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for (var i = 1; i <= preloadcount; i++) {
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reader.getThumb(i, true);
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}
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}, settings.initialLazyDelay);
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}
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};
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var tocInsert = function (image, page, replace) {
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var placeholder = toc.children[page - 1].firstChild;
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if (replace === true) {
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placeholder.parentNode.replaceChild(image, placeholder);
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}
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toc.children[page - 1].addEventListener('click', function (e) {
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reader.queuePage(page);
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});
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};
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var tocPopulate = function () {
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var i = 0;
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while (i < reader.settings.numPages) {
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reader.getThumb(i, true);
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i++;
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}
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reader.thumbnails = true;
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$toc_populate.addClass("hide");
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remove_lazy_loader();
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};
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if (!settings.thumbnails) {
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addLazyLoader(tocView);
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}
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reader.book.getPage(1).then(function(page) {
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var width,
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height,
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viewport,
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page_rotation,
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rotation;
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page_rotation = page.rotate;
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rotation = (page_rotation + reader.settings.rotation) % 360;
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viewport = page.getViewport(1, rotation);
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width = viewport.width;
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height = viewport.height;
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tocCreate(settings.numPages, width, height, settings.thumbnails);
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});
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var onShow = function() {
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$list.addClass('open');
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tocView.classList.add('open');
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};
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var onHide = function() {
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$list.removeClass('open');
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tocView.classList.remove('open');
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};
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var chapterChange = function(e) {
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var id = e.id,
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$item = $list.find("#toc-"+id),
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$current = $list.find(".currentChapter"),
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$open = $list.find('.openChapter');
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if($item.length){
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if($item != $current && $item.has(currentChapter).length > 0) {
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$current.removeClass("currentChapter");
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}
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$item.addClass("currentChapter");
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// $open.removeClass("openChapter");
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$item.parents('li').addClass("openChapter");
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}
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};
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book.on('renderer:chapterDisplayed', chapterChange);
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var tocitems = generateTocItems(toc);
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docfrag.appendChild(tocitems);
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$list.append(docfrag);
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$list.find(".toc_link").on("click", function(event){
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var url = this.getAttribute('href');
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event.preventDefault();
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//-- Provide the Book with the url to show
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// The Url must be found in the books manifest
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book.goto(url);
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$list.find(".currentChapter")
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.addClass("openChapter")
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.removeClass("currentChapter");
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$(this).parent('li').addClass("currentChapter");
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});
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$list.find(".toc_toggle").on("click", function(event){
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var $el = $(this).parent('li'),
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open = $el.hasClass("openChapter");
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event.preventDefault();
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if(open){
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$el.removeClass("openChapter");
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} else {
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$el.addClass("openChapter");
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}
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});
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return {
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"show" : onShow,
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"hide" : onHide
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"hide" : onHide,
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"tocInsert": tocInsert,
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"totPopulate": tocPopulate
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};
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};
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