Mercurial > hg > orthanc-stone

annotate Applications/StoneWebViewer/WebApplication/pdf-viewer.js @ 1871:7053b8a0aaec

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upgrade to year 2022
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:18:48 +0100
parents 3889ae96d2e9
children 07964689cb0b
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
1871
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Affero General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Affero General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Affero General Public License
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 **/
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21
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23
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24 /**
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25 * This source file is an adaptation for Vue.js of the sample code
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26 * "Previous/Next example" of PDF.js:
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27 * https://mozilla.github.io/pdf.js/examples/
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28 *
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29 * =======================================================================
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30 *
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31 * Original license of the sample code:
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32 *
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33 * Copyright 2014 Mozilla Foundation
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34 *
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35 * Licensed under the Apache License, Version 2.0 (the "License");
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36 * you may not use this file except in compliance with the License.
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37 * You may obtain a copy of the License at
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38 *
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39 * http://www.apache.org/licenses/LICENSE-2.0
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40 *
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41 * Unless required by applicable law or agreed to in writing, software
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42 * distributed under the License is distributed on an "AS IS" BASIS,
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43 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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44 * See the License for the specific language governing permissions and
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45 * limitations under the License.
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46 **/
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47
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48
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49 // Loaded via <script> tag, create shortcut to access PDF.js exports.
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50 var pdfjsLib = window['pdfjs-dist/build/pdf'];
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51
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52 // The workerSrc property shall be specified.
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53 pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdn.jsdelivr.net/npm/pdfjs-dist@2.5.207/build/pdf.worker.min.js';
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57 var ZOOM_FACTOR = 1.3;
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58 var FIT_MARGIN = 10; // Additional margin for width/height fitting, in order to avoid spurious scrollbars
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59
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60 Vue.component('pdf-viewer', {
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61 props: [ 'prefix' ],
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62 template: '#pdf-viewer',
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63 data: function() {
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64 return {
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65 container: null,
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66 canvas: null,
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67 ctx: null,
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68 pdf: null, // "pdf" must correspond to a "Uint8Array"
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69
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70 scale: 1,
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71 countPages: 0,
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72 currentPage: 0,
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73 pdfDoc: null,
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74 isRendering: false,
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75 pageNumPending: null
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76 }
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77 },
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78 mounted: function() {
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79 this.container = document.getElementById(this.prefix + '-container');
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80 this.canvas = document.getElementById(this.prefix + '-canvas');
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81 this.ctx = this.canvas.getContext('2d');
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82
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83 if (this.container === null ||
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84 this.canvas === null ||
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85 this.ctx === null) {
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86 alert('Bad viewer configuration');
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87 }
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88
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89 var that = this;
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90 this.container.addEventListener('wheel', function(event) {
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91 that.MouseWheel(event);
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92 });
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93 },
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94 methods: {
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95 NextPage: function() {
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96 if (this.pdfDoc !== null &&
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97 this.currentPage < this.pdfDoc.numPages) {
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98 this.QueueRenderPage(this.currentPage + 1);
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99 }
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100 },
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101 PreviousPage: function() {
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102 if (this.pdfDoc !== null &&
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103 this.currentPage > 1) {
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104 this.QueueRenderPage(this.currentPage - 1);
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105 }
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106 },
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107 FitWidth: function() {
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108 if (this.pdfDoc !== null) {
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109 var that = this;
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110 this.pdfDoc.getPage(this.currentPage).then(function(page) {
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111 // https://github.com/mozilla/pdf.js/issues/5628
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112 // https://stackoverflow.com/a/21064102/881731
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113 // https://stackoverflow.com/a/60008044/881731
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114 var scrollbarWidth = window.innerWidth - document.body.clientWidth + FIT_MARGIN;
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115 that.scale = (that.container.offsetWidth - scrollbarWidth) / page.getViewport({ scale: 1.0 }).width;
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116 that.QueueRenderPage(that.currentPage);
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117 });
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118 }
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119 },
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120 FitHeight: function() {
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121 if (this.pdfDoc !== null) {
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122 var that = this;
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123 this.pdfDoc.getPage(this.currentPage).then(function(page) {
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124 // The computation below assumes that "line-height: 0px" CSS
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125 // on the parent element of the canvas.
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126
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127 // https://github.com/mozilla/pdf.js/issues/5628
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128 var scrollbarHeight = window.innerHeight - document.body.clientHeight + FIT_MARGIN;
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129 that.scale = (that.container.offsetHeight - scrollbarHeight) / page.getViewport({ scale: 1.0 }).height;
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130 that.QueueRenderPage(that.currentPage);
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131 });
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132 }
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133 },
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134 ZoomIn: function() {
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135 this.scale *= ZOOM_FACTOR;
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136 this.QueueRenderPage(this.currentPage);
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137 },
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138 ZoomOut: function() {
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139 this.scale /= ZOOM_FACTOR;
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140 this.QueueRenderPage(this.currentPage);
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141 },
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142 LoadPdf: function(pdf) {
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143 if (!this.isRendering &&
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144 pdf.length > 0) {
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145 this.pdf = pdf;
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146 this.isRendering = true;
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147
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148 var that = this;
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149 pdfjsLib.getDocument(this.pdf).promise.then(function(pdfDoc_) {
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150 that.pdfDoc = pdfDoc_;
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151 that.currentPage = 1;
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152 that.countPages = pdfDoc_.numPages;
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153 that.scale = 1;
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154 that.isRendering = false;
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155 that.pageNumPending = null;
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156
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157 // Initial/first page rendering, after fitting the PDF to the available viewport
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158 that.FitHeight();
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159 });
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160 }
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161 },
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162 RenderPage: function(pageNum) {
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163 var that = this;
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164
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165 if (this.pdfDoc !== null &&
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166 pageNum >= 1 &&
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167 pageNum <= this.countPages) {
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168 this.isRendering = true;
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169 this.pdfDoc.getPage(pageNum).then(function(page) {
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170 var viewport = page.getViewport({scale: that.scale});
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171
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172 that.canvas.style['background-color'] = 'white'; // avoids flickering while the page changes
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173 that.canvas.height = viewport.height;
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174 that.canvas.width = viewport.width;
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175
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176 // Horizontal centering of the canvas. This requires CSS
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177 // "position: relative" on the canvas element.
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178 if (that.canvas.width < that.container.clientWidth) {
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179 that.canvas.style.left = Math.floor((that.container.clientWidth - viewport.width) / 2) + 'px';
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180 } else {
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181 that.canvas.style.left = '0px';
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182 }
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183
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184 // Render PDF page into canvas context
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185 var renderContext = {
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186 canvasContext: that.ctx,
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187 viewport: viewport
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188 };
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189
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190 var renderTask = page.render(renderContext);
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191
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192 // Wait for rendering to finish
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193 renderTask.promise.then(function() {
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194 that.isRendering = false;
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195 that.currentPage = pageNum;
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196 if (that.pageNumPending !== null) {
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197 // New page rendering is pending
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198 that.currentPage = that.pageNumPending;
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199 that.pageNumPending = null;
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200 that.RenderPage();
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201 }
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202 });
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203 });
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204 }
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205 },
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206 QueueRenderPage: function(pageNum) {
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207 if (this.isRendering) {
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208 this.pageNumPending = pageNum;
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209 } else {
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210 this.RenderPage(pageNum);
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211 }
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212 },
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213 MouseWheel: function(event) {
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214 if (event.ctrlKey) {
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215 if (event.deltaY < 0) {
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216 this.ZoomIn();
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217 event.preventDefault();
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218 } else if (event.deltaY > 0) {
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219 this.ZoomOut();
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220 event.preventDefault();
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221 }
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222 } else if (!event.shiftKey &&
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223 !event.altKey &&
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224 !event.metaKey) {
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225 // Is the vertical scrollbar hidden?
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226 // https://stackoverflow.com/a/4814526/881731
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227 if (this.container.scrollHeight <= this.container.clientHeight) {
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228 if (event.deltaY < 0) {
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229 this.PreviousPage();
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230 event.preventDefault();
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231 } else if (event.deltaY > 0) {
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232 this.NextPage();
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233 event.preventDefault();
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234 }
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235 }
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236 }
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237 }
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238 }
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239 });