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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.PDFSinglePageViewer = void 0;
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28 |
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29 | var _base_viewer = require("./base_viewer.js");
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30 |
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31 | var _pdf = require("../pdf");
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32 |
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33 | class PDFSinglePageViewer extends _base_viewer.BaseViewer {
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34 | constructor(options) {
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35 | super(options);
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36 |
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37 | this.eventBus._on("pagesinit", evt => {
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38 | this._ensurePageViewVisible();
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39 | });
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40 | }
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41 |
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42 | get _setDocumentViewerElement() {
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43 | return (0, _pdf.shadow)(this, "_setDocumentViewerElement", this._shadowViewer);
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44 | }
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45 |
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46 | _resetView() {
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47 | super._resetView();
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48 |
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49 | this._previousPageNumber = 1;
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50 | this._shadowViewer = document.createDocumentFragment();
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51 | this._updateScrollDown = null;
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52 | }
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53 |
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54 | _ensurePageViewVisible() {
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55 | const pageView = this._pages[this._currentPageNumber - 1];
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56 | const previousPageView = this._pages[this._previousPageNumber - 1];
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57 | const viewerNodes = this.viewer.childNodes;
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58 |
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59 | switch (viewerNodes.length) {
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60 | case 0:
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61 | this.viewer.appendChild(pageView.div);
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62 | break;
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63 |
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64 | case 1:
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65 | if (viewerNodes[0] !== previousPageView.div) {
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66 | throw new Error("_ensurePageViewVisible: Unexpected previously visible page.");
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67 | }
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68 |
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69 | if (pageView === previousPageView) {
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70 | break;
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71 | }
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72 |
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73 | this._shadowViewer.appendChild(previousPageView.div);
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74 |
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75 | this.viewer.appendChild(pageView.div);
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76 | this.container.scrollTop = 0;
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77 | break;
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78 |
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79 | default:
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80 | throw new Error("_ensurePageViewVisible: Only one page should be visible at a time.");
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81 | }
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82 |
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83 | this._previousPageNumber = this._currentPageNumber;
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84 | }
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85 |
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86 | _scrollUpdate() {
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87 | if (this._updateScrollDown) {
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88 | this._updateScrollDown();
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89 | }
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90 |
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91 | super._scrollUpdate();
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92 | }
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93 |
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94 | _scrollIntoView({
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95 | pageDiv,
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96 | pageSpot = null,
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97 | pageNumber = null
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98 | }) {
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99 | if (pageNumber) {
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100 | this._setCurrentPageNumber(pageNumber);
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101 | }
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102 |
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103 | const scrolledDown = this._currentPageNumber >= this._previousPageNumber;
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104 |
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105 | this._ensurePageViewVisible();
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106 |
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107 | this.update();
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108 |
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109 | super._scrollIntoView({
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110 | pageDiv,
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111 | pageSpot,
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112 | pageNumber
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113 | });
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114 |
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115 | this._updateScrollDown = () => {
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116 | this.scroll.down = scrolledDown;
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117 | this._updateScrollDown = null;
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118 | };
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119 | }
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120 |
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121 | _getVisiblePages() {
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122 | return this._getCurrentVisiblePage();
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123 | }
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124 |
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125 | _updateHelper(visiblePages) {}
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126 |
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127 | get _isScrollModeHorizontal() {
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128 | return (0, _pdf.shadow)(this, "_isScrollModeHorizontal", false);
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129 | }
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130 |
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131 | _updateScrollMode() {}
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132 |
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133 | _updateSpreadMode() {}
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134 |
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135 | }
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136 |
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137 | exports.PDFSinglePageViewer = PDFSinglePageViewer; |
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