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21 |
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22 | "use strict";
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23 |
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24 | Object.defineProperty(exports, "__esModule", {
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25 | value: true
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26 | });
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27 | exports.PDFRenderingQueue = void 0;
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28 |
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29 | var _pdf = require("../pdf");
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30 |
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31 | var _ui_utils = require("./ui_utils.js");
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32 |
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33 | const CLEANUP_TIMEOUT = 30000;
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34 |
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35 | class PDFRenderingQueue {
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36 | constructor() {
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37 | this.pdfViewer = null;
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38 | this.pdfThumbnailViewer = null;
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39 | this.onIdle = null;
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40 | this.highestPriorityPage = null;
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41 | this.idleTimeout = null;
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42 | this.printing = false;
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43 | this.isThumbnailViewEnabled = false;
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44 | }
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45 |
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46 | setViewer(pdfViewer) {
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47 | this.pdfViewer = pdfViewer;
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48 | }
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49 |
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50 | setThumbnailViewer(pdfThumbnailViewer) {
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51 | this.pdfThumbnailViewer = pdfThumbnailViewer;
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52 | }
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53 |
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54 | isHighestPriority(view) {
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55 | return this.highestPriorityPage === view.renderingId;
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56 | }
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57 |
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58 | hasViewer() {
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59 | return !!this.pdfViewer;
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60 | }
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61 |
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62 | renderHighestPriority(currentlyVisiblePages) {
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63 | if (this.idleTimeout) {
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64 | clearTimeout(this.idleTimeout);
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65 | this.idleTimeout = null;
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66 | }
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67 |
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68 | if (this.pdfViewer.forceRendering(currentlyVisiblePages)) {
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69 | return;
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70 | }
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71 |
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72 | if (this.isThumbnailViewEnabled && this.pdfThumbnailViewer?.forceRendering()) {
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73 | return;
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74 | }
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75 |
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76 | if (this.printing) {
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77 | return;
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78 | }
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79 |
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80 | if (this.onIdle) {
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81 | this.idleTimeout = setTimeout(this.onIdle.bind(this), CLEANUP_TIMEOUT);
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82 | }
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83 | }
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84 |
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85 | getHighestPriority(visible, views, scrolledDown, preRenderExtra = false) {
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86 | const visibleViews = visible.views,
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87 | numVisible = visibleViews.length;
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88 |
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89 | if (numVisible === 0) {
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90 | return null;
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91 | }
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92 |
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93 | for (let i = 0; i < numVisible; i++) {
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94 | const view = visibleViews[i].view;
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95 |
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96 | if (!this.isViewFinished(view)) {
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97 | return view;
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98 | }
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99 | }
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100 |
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101 | const firstId = visible.first.id,
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102 | lastId = visible.last.id;
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103 |
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104 | if (lastId - firstId + 1 > numVisible) {
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105 | const visibleIds = visible.ids;
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106 |
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107 | for (let i = 1, ii = lastId - firstId; i < ii; i++) {
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108 | const holeId = scrolledDown ? firstId + i : lastId - i;
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109 |
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110 | if (visibleIds.has(holeId)) {
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111 | continue;
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112 | }
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113 |
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114 | const holeView = views[holeId - 1];
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115 |
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116 | if (!this.isViewFinished(holeView)) {
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117 | return holeView;
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118 | }
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119 | }
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120 | }
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121 |
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122 | let preRenderIndex = scrolledDown ? lastId : firstId - 2;
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123 | let preRenderView = views[preRenderIndex];
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124 |
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125 | if (preRenderView && !this.isViewFinished(preRenderView)) {
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126 | return preRenderView;
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127 | }
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128 |
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129 | if (preRenderExtra) {
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130 | preRenderIndex += scrolledDown ? 1 : -1;
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131 | preRenderView = views[preRenderIndex];
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132 |
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133 | if (preRenderView && !this.isViewFinished(preRenderView)) {
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134 | return preRenderView;
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135 | }
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136 | }
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137 |
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138 | return null;
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139 | }
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140 |
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141 | isViewFinished(view) {
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142 | return view.renderingState === _ui_utils.RenderingStates.FINISHED;
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143 | }
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144 |
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145 | renderView(view) {
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146 | switch (view.renderingState) {
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147 | case _ui_utils.RenderingStates.FINISHED:
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148 | return false;
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149 |
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150 | case _ui_utils.RenderingStates.PAUSED:
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151 | this.highestPriorityPage = view.renderingId;
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152 | view.resume();
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153 | break;
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154 |
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155 | case _ui_utils.RenderingStates.RUNNING:
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156 | this.highestPriorityPage = view.renderingId;
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157 | break;
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158 |
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159 | case _ui_utils.RenderingStates.INITIAL:
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160 | this.highestPriorityPage = view.renderingId;
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161 | view.draw().finally(() => {
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162 | this.renderHighestPriority();
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163 | }).catch(reason => {
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164 | if (reason instanceof _pdf.RenderingCancelledException) {
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165 | return;
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166 | }
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167 |
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168 | console.error(`renderView: "${reason}"`);
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169 | });
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170 | break;
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171 | }
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172 |
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173 | return true;
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174 | }
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175 |
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176 | }
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177 |
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178 | exports.PDFRenderingQueue = PDFRenderingQueue; |
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