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113 lines
4.1 KiB
113 lines
4.1 KiB
/* (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
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*
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* All Rights Reserved. See copyright.txt for details and a complete list of authors.
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* Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
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*
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* $Id$
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*
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* Include file for wikiplugin_mediaplayer.php
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*
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*/
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(function ($) {
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$('.mediaplayerDataUrl').each(function (index, element) {
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var pdfDoc = null,
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pageNum = 1,
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pageRendering = false,
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pageNumPending = null,
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scale = 1,
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mediaplayerId = this.id.replace('mediaplayer-pdf-', ''),
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canvas = $('#mediaplayer-pdf-canvas-' + mediaplayerId).get(0),
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ctx = canvas.getContext('2d'),
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url = this.value;
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$('#mediaplayer-pdf-prev-' + mediaplayerId).get(0).addEventListener('click', function () {
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onPrevPage(pdfDoc, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending);
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}, false);
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$('#mediaplayer-pdf-next-' + mediaplayerId).get(0).addEventListener('click', function () {
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onNextPage(pdfDoc, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending);
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}, false);
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pdfjsLib.getDocument(url).then(function (pdfDoc_) {
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pdfDoc = pdfDoc_;
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$('#mediaplayer-pdf-page-count-' + mediaplayerId).get(0).textContent = pdfDoc.numPages;
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// Initial/first page rendering
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renderPage(pdfDoc, pageNum, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending);
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});
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});
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/**
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* Get page info from document, resize canvas accordingly, and render page.
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* @param num Page number.
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*/
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function renderPage(pdfDoc, num, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending) {
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pageRendering = true;
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// Using promise to fetch the page
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pdfDoc.getPage(num).then(function (page) {
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var viewport = page.getViewport(scale);
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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// Render PDF page into canvas context
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var renderContext = {
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canvasContext: ctx,
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viewport: viewport
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};
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var renderTask = page.render(renderContext);
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// Wait for rendering to finish
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renderTask.promise.then(function () {
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pageRendering = false;
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if (pageNumPending !== null) {
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// New page rendering is pending
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renderPage(pdfDoc, pageNumPending, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending);
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pageNumPending = null;
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}
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});
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});
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// Update page counters
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$('#mediaplayer-pdf-page-num-' + mediaplayerId).get(0).textContent = num;
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}
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/**
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* If another page rendering in progress, waits until the rendering is
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* finised. Otherwise, executes rendering immediately.
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*/
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function queueRenderPage(pdfDoc, num, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending) {
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if (pageRendering) {
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pageNumPending = num;
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} else {
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renderPage(pdfDoc, num, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending);
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}
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}
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/**
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* Displays previous page.
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*/
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function onPrevPage(pdfDoc, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending) {
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var pageNum = $('#mediaplayer-pdf-page-num-' + mediaplayerId).text();
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if (pageNum <= 1) {
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return;
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}
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pageNum--;
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queueRenderPage(pdfDoc, pageNum, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending);
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}
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/**
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* Displays next page.
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*/
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function onNextPage(pdfDoc, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending) {
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var pageNum = $('#mediaplayer-pdf-page-num-' + mediaplayerId).text();
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if (pdfDoc) {
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if (pageNum >= pdfDoc.numPages) {
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return;
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}
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pageNum++;
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queueRenderPage(pdfDoc, pageNum, mediaplayerId, scale, canvas, ctx, pageRendering, pageNumPending);
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}
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}
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})($);
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