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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.TextLayerBuilder = 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 | const EXPAND_DIVS_TIMEOUT = 300;
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32 |
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33 | class TextLayerBuilder {
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34 | constructor({
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35 | textLayerDiv,
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36 | eventBus,
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37 | pageIndex,
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38 | viewport,
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39 | highlighter = null,
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40 | enhanceTextSelection = false
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41 | }) {
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42 | this.textLayerDiv = textLayerDiv;
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43 | this.eventBus = eventBus;
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44 | this.textContent = null;
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45 | this.textContentItemsStr = [];
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46 | this.textContentStream = null;
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47 | this.renderingDone = false;
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48 | this.pageNumber = pageIndex + 1;
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49 | this.viewport = viewport;
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50 | this.textDivs = [];
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51 | this.textLayerRenderTask = null;
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52 | this.highlighter = highlighter;
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53 | this.enhanceTextSelection = enhanceTextSelection;
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54 |
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55 | this._bindMouse();
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56 | }
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57 |
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58 | _finishRendering() {
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59 | this.renderingDone = true;
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60 |
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61 | if (!this.enhanceTextSelection) {
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62 | const endOfContent = document.createElement("div");
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63 | endOfContent.className = "endOfContent";
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64 | this.textLayerDiv.append(endOfContent);
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65 | }
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66 |
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67 | this.eventBus.dispatch("textlayerrendered", {
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68 | source: this,
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69 | pageNumber: this.pageNumber,
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70 | numTextDivs: this.textDivs.length
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71 | });
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72 | }
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73 |
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74 | render(timeout = 0) {
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75 | if (!(this.textContent || this.textContentStream) || this.renderingDone) {
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76 | return;
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77 | }
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78 |
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79 | this.cancel();
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80 | this.textDivs.length = 0;
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81 | this.highlighter?.setTextMapping(this.textDivs, this.textContentItemsStr);
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82 | const textLayerFrag = document.createDocumentFragment();
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83 | this.textLayerRenderTask = (0, _pdf.renderTextLayer)({
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84 | textContent: this.textContent,
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85 | textContentStream: this.textContentStream,
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86 | container: textLayerFrag,
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87 | viewport: this.viewport,
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88 | textDivs: this.textDivs,
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89 | textContentItemsStr: this.textContentItemsStr,
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90 | timeout,
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91 | enhanceTextSelection: this.enhanceTextSelection
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92 | });
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93 | this.textLayerRenderTask.promise.then(() => {
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94 | this.textLayerDiv.append(textLayerFrag);
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95 |
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96 | this._finishRendering();
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97 |
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98 | this.highlighter?.enable();
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99 | }, function (reason) {});
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100 | }
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101 |
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102 | cancel() {
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103 | if (this.textLayerRenderTask) {
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104 | this.textLayerRenderTask.cancel();
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105 | this.textLayerRenderTask = null;
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106 | }
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107 |
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108 | this.highlighter?.disable();
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109 | }
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110 |
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111 | setTextContentStream(readableStream) {
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112 | this.cancel();
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113 | this.textContentStream = readableStream;
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114 | }
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115 |
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116 | setTextContent(textContent) {
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117 | this.cancel();
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118 | this.textContent = textContent;
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119 | }
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120 |
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121 | _bindMouse() {
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122 | const div = this.textLayerDiv;
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123 | let expandDivsTimer = null;
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124 | div.addEventListener("mousedown", evt => {
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125 | if (this.enhanceTextSelection && this.textLayerRenderTask) {
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126 | this.textLayerRenderTask.expandTextDivs(true);
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127 |
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128 | if (expandDivsTimer) {
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129 | clearTimeout(expandDivsTimer);
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130 | expandDivsTimer = null;
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131 | }
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132 |
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133 | return;
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134 | }
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135 |
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136 | const end = div.querySelector(".endOfContent");
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137 |
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138 | if (!end) {
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139 | return;
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140 | }
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141 |
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142 | let adjustTop = evt.target !== div;
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143 | adjustTop = adjustTop && window.getComputedStyle(end).getPropertyValue("-moz-user-select") !== "none";
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144 |
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145 | if (adjustTop) {
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146 | const divBounds = div.getBoundingClientRect();
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147 | const r = Math.max(0, (evt.pageY - divBounds.top) / divBounds.height);
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148 | end.style.top = (r * 100).toFixed(2) + "%";
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149 | }
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150 |
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151 | end.classList.add("active");
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152 | });
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153 | div.addEventListener("mouseup", () => {
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154 | if (this.enhanceTextSelection && this.textLayerRenderTask) {
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155 | expandDivsTimer = setTimeout(() => {
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156 | if (this.textLayerRenderTask) {
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157 | this.textLayerRenderTask.expandTextDivs(false);
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158 | }
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159 |
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160 | expandDivsTimer = null;
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161 | }, EXPAND_DIVS_TIMEOUT);
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162 | return;
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163 | }
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164 |
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165 | const end = div.querySelector(".endOfContent");
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166 |
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167 | if (!end) {
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168 | return;
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169 | }
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170 |
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171 | end.style.top = "";
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172 | end.classList.remove("active");
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173 | });
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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.TextLayerBuilder = TextLayerBuilder; |
\ | No newline at end of file |