cd48f05597
Also, cleans up variable definitions slightly in the `FirefoxPrintService.layout` method.
114 lines
3.6 KiB
JavaScript
114 lines
3.6 KiB
JavaScript
/* 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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import { AppOptions } from './app_options';
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import { CSS_UNITS } from './ui_utils';
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import { PDFPrintServiceFactory } from './app';
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import { shadow } from 'pdfjs-lib';
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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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let canvas = document.createElement('canvas');
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// The size of the canvas in pixels for printing.
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const PRINT_RESOLUTION = AppOptions.get('printResolution') || 150;
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const 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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let 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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let 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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let 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({ scale: 1, rotation: size.rotation, }),
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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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}
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FirefoxPrintService.prototype = {
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layout() {
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const { pdfDocument, pagesOverview, printContainer, } = this;
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const body = document.querySelector('body');
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body.setAttribute('data-pdfjsprinting', true);
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for (let i = 0, ii = pagesOverview.length; i < ii; ++i) {
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composePage(pdfDocument, i + 1, pagesOverview[i], printContainer);
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}
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},
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destroy() {
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this.printContainer.textContent = '';
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const body = document.querySelector('body');
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body.removeAttribute('data-pdfjsprinting');
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},
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};
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PDFPrintServiceFactory.instance = {
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get supportsPrinting() {
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let canvas = document.createElement('canvas');
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let value = 'mozPrintCallback' in canvas;
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return shadow(this, 'supportsPrinting', value);
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},
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createPrintService(pdfDocument, pagesOverview, printContainer) {
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return new FirefoxPrintService(pdfDocument, pagesOverview, printContainer);
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},
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};
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export {
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FirefoxPrintService,
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};
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