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1 (function () {
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2 var url = window.location,
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3 body = document.body,
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4 slides = document.querySelectorAll('div.slide'),
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5 progress = document.querySelector('div.progress div'),
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6 slideList = [],
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7 l = slides.length,
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8 i;
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9
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10 for (i = 0; i < l; i++) {
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11 slideList.push(slides[i].id);
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12 }
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13
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14 function getTransform() {
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15 var denominator = Math.max(
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16 body.clientWidth / window.innerWidth,
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17 body.clientHeight / window.innerHeight
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18 );
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19
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20 return 'scale(' + (1 / denominator) + ')';
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21 }
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22
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23 function applyTransform(transform) {
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24 body.style.MozTransform = transform;
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25 body.style.WebkitTransform = transform;
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26 body.style.OTransform = transform;
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27 body.style.msTransform = transform;
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28 body.style.transform = transform;
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29 }
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30
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31 function enterSingleSlideMode() {
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32 body.className = 'full';
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33 applyTransform(getTransform());
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34 }
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35
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36 function enterSlideListMode() {
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37 body.className = 'list';
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38 applyTransform('none');
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39 }
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40
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41 function getCurrentSlideNumber() {
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42 return slideList.indexOf(url.hash.substr(1));
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43 }
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44
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45 function scrollToCurrentSlide() {
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46 var current_slide = document.getElementById(slideList[getCurrentSlideNumber()]);
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47
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48 if (null != current_slide) {
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49 window.scrollTo(0, current_slide.offsetTop);
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50 }
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51 }
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52
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53 function isSlideListMode() {
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54 return 'full' !== url.search.substr(1);
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55 }
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56
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57 function normalizeSlideNumber(slide_number) {
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58 if (0 > slide_number) {
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59 return slideList.length - 1;
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60 } else if (slideList.length <= slide_number) {
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61 return 0;
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62 } else {
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63 return slide_number;
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64 }
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65 }
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66
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67 function updateProgress(slide_number) {
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68 if (!progress) return;
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69 progress.style.width = (100 / (slideList.length - 1) * normalizeSlideNumber(slide_number)).toFixed(2) + '%';
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70 }
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71
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72 function getSlideHashByNumber(slide_number) {
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73 return '#' + slideList[normalizeSlideNumber(slide_number)];
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74 }
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75
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76 function goToSlide(slide_number) {
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77 url.hash = getSlideHashByNumber(slide_number);
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78
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79 if (!isSlideListMode()) {
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80 updateProgress(slide_number);
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81 }
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82 }
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83
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84 window.addEventListener('DOMContentLoaded', function () {
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85 if (!isSlideListMode()) {
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86 // "?full" is present without slide hash so we should display first
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87 // slide
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88 if ( -1 === getCurrentSlideNumber() ) {
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89 history.replaceState(null, null, url.pathname + '?full' + getSlideHashByNumber( 0 ) );
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90 }
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91
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92 enterSingleSlideMode();
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93 updateProgress(getCurrentSlideNumber());
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94 }
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95 }, false);
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96
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97 window.addEventListener('popstate', function (e) {
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98 if (isSlideListMode()) {
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99 enterSlideListMode();
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100 scrollToCurrentSlide();
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101 } else {
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102 enterSingleSlideMode();
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103 }
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104 }, false);
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105
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106 window.addEventListener('resize', function (e) {
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107 if (!isSlideListMode()) {
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108 applyTransform(getTransform());
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109 }
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110 }, false);
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111
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112 document.addEventListener('keydown', function (e) {
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113 if (e.altKey || e.ctrlKey || e.metaKey) return;
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114
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115 var current_slide_number = getCurrentSlideNumber();
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116
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117 switch (e.which) {
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118 case 9: // Tab = +1; Shift + Tab = -1
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119 if (isSlideListMode()) {
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120 e.preventDefault();
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121
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122 current_slide_number += e.shiftKey ? -1 : 1;
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123 url.hash = getSlideHashByNumber(current_slide_number);
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124 }
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125 break;
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126
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127 case 13: // Enter
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128 if (isSlideListMode()) {
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129 e.preventDefault();
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130
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131 history.pushState(null, null, url.pathname + '?full' + getSlideHashByNumber(current_slide_number));
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132 enterSingleSlideMode();
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133
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134 updateProgress(current_slide_number);
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135 }
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136 break;
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137
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138 case 27: // Esc
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139 if (!isSlideListMode()) {
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140 e.preventDefault();
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141
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142 history.pushState(null, null, url.pathname + getSlideHashByNumber(current_slide_number));
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143 enterSlideListMode();
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144 scrollToCurrentSlide();
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145 }
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146 break;
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147
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148 case 33: // PgUp
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149 case 38: // Up
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150 case 37: // Left
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151 case 72: // h
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152 case 75: // k
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153 e.preventDefault();
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154
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155 current_slide_number--;
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156 goToSlide(current_slide_number);
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157 break;
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158
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159 case 34: // PgDown
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160 case 40: // Down
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161 case 39: // Right
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162 case 76: // l
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163 case 74: // j
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164 e.preventDefault();
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165
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166 current_slide_number++;
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167 goToSlide(current_slide_number);
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168 break;
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169
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170 case 36: // Home
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171 e.preventDefault();
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172
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173 current_slide_number = 0;
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174 goToSlide(current_slide_number);
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175 break;
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176
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177 case 35: // End
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178 e.preventDefault();
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179
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180 current_slide_number = slideList.length - 1;
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181 goToSlide(current_slide_number);
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182 break;
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183
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184 case 32: // Space = +1; Shift + Space = -1
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185 e.preventDefault();
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186
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187 current_slide_number += e.shiftKey ? -1 : 1;
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188 goToSlide(current_slide_number);
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189 break;
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190
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191 default:
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192 // Behave as usual
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193 }
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194 }, false);
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195
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196 document.addEventListener('click', function (e) {
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197 if (
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198 'SECTION' === e.target.nodeName &&
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199 -1 !== e.target.parentNode.parentNode.className.indexOf('slide') &&
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200 isSlideListMode()
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201 ) {
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202 e.preventDefault();
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203
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204 // NOTE: we should update hash to get things work properly
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205 url.hash = '#' + e.target.parentNode.parentNode.id;
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206 history.replaceState(null, null, url.pathname + '?full#' + e.target.parentNode.parentNode.id);
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207 enterSingleSlideMode();
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208
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209 updateProgress(getCurrentSlideNumber());
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210 }
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211 }, false);
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212
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213 }());
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