Yury Delendik
9 years ago
8 changed files with 213 additions and 118 deletions
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/* Copyright 2016 Mozilla Foundation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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'use strict'; |
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(function (root, factory) { |
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if (typeof define === 'function' && define.amd) { |
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define('pdfjs-web/firefox_print_service', ['exports', 'pdfjs-web/ui_utils', |
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'pdfjs-web/app', 'pdfjs-web/pdfjs'], factory); |
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} else if (typeof exports !== 'undefined') { |
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factory(exports, require('./ui_utils.js'), require('./app.js'), |
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require('./pdfjs.js')); |
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} else { |
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factory((root.pdfjsWebFirefoxPrintService = {}), root.pdfjsWebUIUtils, |
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root.pdfjsWebApp, root.pdfjsWebPDFJS); |
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} |
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}(this, function (exports, uiUtils, app, pdfjsLib) { |
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var CSS_UNITS = uiUtils.CSS_UNITS; |
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var PDFPrintServiceFactory = app.PDFPrintServiceFactory; |
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// Creates a placeholder with div and canvas with right size for the page.
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function composePage(pdfDocument, pageNumber, size, printContainer) { |
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var canvas = document.createElement('canvas'); |
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// The size of the canvas in pixels for printing.
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var PRINT_RESOLUTION = 150; |
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var PRINT_UNITS = PRINT_RESOLUTION / 72.0; |
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canvas.width = Math.floor(size.width * PRINT_UNITS); |
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canvas.height = Math.floor(size.height * PRINT_UNITS); |
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// The physical size of the canvas as specified by the PDF document.
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canvas.style.width = Math.floor(size.width * CSS_UNITS) + 'px'; |
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canvas.style.height = Math.floor(size.height * CSS_UNITS) + 'px'; |
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var canvasWrapper = document.createElement('div'); |
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canvasWrapper.appendChild(canvas); |
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printContainer.appendChild(canvasWrapper); |
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canvas.mozPrintCallback = function(obj) { |
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// Printing/rendering the page.
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var ctx = obj.context; |
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ctx.save(); |
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ctx.fillStyle = 'rgb(255, 255, 255)'; |
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ctx.fillRect(0, 0, canvas.width, canvas.height); |
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ctx.restore(); |
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pdfDocument.getPage(pageNumber).then(function (pdfPage) { |
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var renderContext = { |
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canvasContext: ctx, |
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transform: [PRINT_UNITS, 0, 0, PRINT_UNITS, 0, 0], |
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viewport: pdfPage.getViewport(1), |
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intent: 'print' |
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}; |
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return pdfPage.render(renderContext).promise; |
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}).then(function() { |
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// Tell the printEngine that rendering this canvas/page has finished.
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obj.done(); |
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}, function(error) { |
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console.error(error); |
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// Tell the printEngine that rendering this canvas/page has failed.
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// This will make the print process stop.
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if ('abort' in obj) { |
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obj.abort(); |
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} else { |
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obj.done(); |
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} |
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}); |
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}; |
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} |
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function FirefoxPrintService(pdfDocument, pagesOverview, printContainer) { |
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this.pdfDocument = pdfDocument; |
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this.pagesOverview = pagesOverview; |
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this.printContainer = printContainer; |
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this.pageStyleSheet = null; |
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} |
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FirefoxPrintService.prototype = { |
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layout: function () { |
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var pdfDocument = this.pdfDocument; |
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var printContainer = this.printContainer; |
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var body = document.querySelector('body'); |
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body.setAttribute('data-pdfjsprinting', true); |
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var hasEqualPageSizes = this.pagesOverview.every(function (size) { |
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return size.width === this.pagesOverview[0].width && |
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size.height === this.pagesOverview[0].height; |
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}, this); |
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if (!hasEqualPageSizes) { |
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console.warn('Not all pages have the same size. The printed ' + |
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'result may be incorrect!'); |
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} |
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// Insert a @page + size rule to make sure that the page size is correctly
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// set. Note that we assume that all pages have the same size, because
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// variable-size pages are not supported yet (e.g. in Chrome & Firefox).
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// TODO(robwu): Use named pages when size calculation bugs get resolved
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// (e.g. https://crbug.com/355116) AND when support for named pages is
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// added (http://www.w3.org/TR/css3-page/#using-named-pages).
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// In browsers where @page + size is not supported (such as Firefox,
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// https://bugzil.la/851441), the next stylesheet will be ignored and the
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// user has to select the correct paper size in the UI if wanted.
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this.pageStyleSheet = document.createElement('style'); |
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var pageSize = this.pagesOverview[0]; |
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this.pageStyleSheet.textContent = |
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// "size:<width> <height>" is what we need. But also add "A4" because
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// Firefox incorrectly reports support for the other value.
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'@supports ((size:A4) and (size:1pt 1pt)) {' + |
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'@page { size: ' + pageSize.width + 'pt ' + pageSize.height + 'pt;}' + |
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'}'; |
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body.appendChild(this.pageStyleSheet); |
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for (var i = 0, ii = this.pagesOverview.length; i < ii; ++i) { |
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composePage(pdfDocument, i + 1, this.pagesOverview[i], printContainer); |
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} |
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}, |
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destroy: function () { |
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this.printContainer.textContent = ''; |
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if (this.pageStyleSheet && this.pageStyleSheet.parentNode) { |
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this.pageStyleSheet.parentNode.removeChild(this.pageStyleSheet); |
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this.pageStyleSheet = null; |
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} |
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} |
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}; |
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PDFPrintServiceFactory.instance = { |
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get supportsPrinting() { |
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var canvas = document.createElement('canvas'); |
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var value = 'mozPrintCallback' in canvas; |
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return pdfjsLib.shadow(this, 'supportsPrinting', value); |
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}, |
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createPrintService: function (pdfDocument, pagesOverview, printContainer) { |
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return new FirefoxPrintService(pdfDocument, pagesOverview, |
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printContainer); |
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} |
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}; |
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exports.FirefoxPrintService = FirefoxPrintService; |
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})); |
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