annotate jquery.zoom.js @ 6:42076db43d42 draft

Fixed auto resizing plus various other minor bugs
author saskia-hiltemann
date Mon, 16 Nov 2015 08:56:22 -0500
parents ac5f9272033b
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1 /*!
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2 Zoom v1.7.13 - 2014-04-29
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3 Enlarge images on click or mouseover.
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4 (c) 2014 Jack Moore - http://www.jacklmoore.com/zoom
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5 license: http://www.opensource.org/licenses/mit-license.php
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6 */
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7 (function ($) {
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8 var defaults = {
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9 url: false,
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10 callback: false,
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11 target: false,
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12 duration: 120,
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13 on: 'mouseover', // other options: grab, click, toggle
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14 touch: true, // enables a touch fallback
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15 onZoomIn: false,
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16 onZoomOut: false,
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17 magnify: 1
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18 };
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19
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20 // Core Zoom Logic, independent of event listeners.
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21 $.zoom = function(target, source, img, magnify) {
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22 var targetHeight,
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23 targetWidth,
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24 sourceHeight,
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25 sourceWidth,
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26 xRatio,
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27 yRatio,
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28 offset,
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29 position = $(target).css('position'),
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30 $source = $(source);
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31
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32 // The parent element needs positioning so that the zoomed element can be correctly positioned within.
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33 target.style.position = /(absolute|fixed)/.test(position) ? position : 'relative';
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34 target.style.overflow = 'hidden';
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35
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36 img.style.width = img.style.height = '';
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37
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38 $(img)
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39 .addClass('zoomImg')
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40 .css({
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41 position: 'absolute',
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42 top: 0,
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43 left: 0,
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44 opacity: 0,
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45 width: img.width * magnify,
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46 height: img.height * magnify,
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47 border: 'none',
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48 maxWidth: 'none',
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49 maxHeight: 'none'
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50 })
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51 .appendTo(target);
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52
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53 return {
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54 init: function() {
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55 targetWidth = $(target).outerWidth();
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56 targetHeight = $(target).outerHeight();
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57
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58 if (source === target) {
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59 sourceWidth = targetWidth;
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60 sourceHeight = targetHeight;
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61 } else {
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62 sourceWidth = $source.outerWidth();
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63 sourceHeight = $source.outerHeight();
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64 }
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65
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66 xRatio = (img.width - targetWidth) / sourceWidth;
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67 yRatio = (img.height - targetHeight) / sourceHeight;
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68
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69 offset = $source.offset();
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70 },
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71 move: function (e) {
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72 var left = (e.pageX - offset.left),
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73 top = (e.pageY - offset.top);
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74
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75 top = Math.max(Math.min(top, sourceHeight), 0);
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76 left = Math.max(Math.min(left, sourceWidth), 0);
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77
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78 img.style.left = (left * -xRatio) + 'px';
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79 img.style.top = (top * -yRatio) + 'px';
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80 }
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81 };
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82 };
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83
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84 $.fn.zoom = function (options) {
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85 return this.each(function () {
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86 var
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87 settings = $.extend({}, defaults, options || {}),
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88 //target will display the zoomed image
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89 target = settings.target || this,
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90 //source will provide zoom location info (thumbnail)
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91 source = this,
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92 $source = $(source),
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93 img = document.createElement('img'),
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94 $img = $(img),
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95 mousemove = 'mousemove.zoom',
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96 clicked = false,
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97 touched = false,
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98 $urlElement;
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99
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100 // If a url wasn't specified, look for an image element.
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101 if (!settings.url) {
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102 $urlElement = $source.find('img');
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103 if ($urlElement[0]) {
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104 settings.url = $urlElement.data('src') || $urlElement.attr('src');
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105 }
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106 if (!settings.url) {
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107 return;
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108 }
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109 }
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110
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111 (function(){
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112 var position = target.style.position;
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113 var overflow = target.style.overflow;
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114
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115 $source.one('zoom.destroy', function(){
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116 $source.off(".zoom");
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117 target.style.position = position;
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118 target.style.overflow = overflow;
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119 $img.remove();
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120 });
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121
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122 }());
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123
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124 img.onload = function () {
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125 var zoom = $.zoom(target, source, img, settings.magnify);
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126
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127 function start(e) {
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128 zoom.init();
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129 zoom.move(e);
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130
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131 // Skip the fade-in for IE8 and lower since it chokes on fading-in
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132 // and changing position based on mousemovement at the same time.
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133 $img.stop()
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134 .fadeTo($.support.opacity ? settings.duration : 0, 1, $.isFunction(settings.onZoomIn) ? settings.onZoomIn.call(img) : false);
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135 }
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136
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137 function stop() {
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138 $img.stop()
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139 .fadeTo(settings.duration, 0, $.isFunction(settings.onZoomOut) ? settings.onZoomOut.call(img) : false);
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140 }
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141
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142 // Mouse events
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143 if (settings.on === 'grab') {
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144 $source
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145 .on('mousedown.zoom',
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146 function (e) {
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147 if (e.which === 1) {
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148 $(document).one('mouseup.zoom',
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149 function () {
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150 stop();
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151
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152 $(document).off(mousemove, zoom.move);
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153 }
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154 );
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155
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156 start(e);
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157
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158 $(document).on(mousemove, zoom.move);
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159
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160 e.preventDefault();
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161 }
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162 }
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163 );
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164 } else if (settings.on === 'click') {
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165 $source.on('click.zoom',
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166 function (e) {
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167 if (clicked) {
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168 // bubble the event up to the document to trigger the unbind.
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169 return;
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170 } else {
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171 clicked = true;
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172 start(e);
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173 $(document).on(mousemove, zoom.move);
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174 $(document).one('click.zoom',
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175 function () {
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176 stop();
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177 clicked = false;
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178 $(document).off(mousemove, zoom.move);
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179 }
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180 );
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181 return false;
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182 }
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183 }
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184 );
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185 } else if (settings.on === 'toggle') {
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186 $source.on('click.zoom',
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187 function (e) {
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188 if (clicked) {
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189 stop();
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190 } else {
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191 start(e);
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192 }
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193 clicked = !clicked;
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194 }
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195 );
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196 } else if (settings.on === 'mouseover') {
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197 zoom.init(); // Preemptively call init because IE7 will fire the mousemove handler before the hover handler.
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198
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199 $source
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200 .on('mouseenter.zoom', start)
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201 .on('mouseleave.zoom', stop)
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202 .on(mousemove, zoom.move);
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203 }
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204
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205 // Touch fallback
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206 if (settings.touch) {
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207 $source
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208 .on('touchstart.zoom', function (e) {
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209 e.preventDefault();
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210 if (touched) {
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211 touched = false;
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212 stop();
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213 } else {
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214 touched = true;
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215 start( e.originalEvent.touches[0] || e.originalEvent.changedTouches[0] );
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216 }
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217 })
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218 .on('touchmove.zoom', function (e) {
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219 e.preventDefault();
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220 zoom.move( e.originalEvent.touches[0] || e.originalEvent.changedTouches[0] );
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221 });
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222 }
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223
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224 if ($.isFunction(settings.callback)) {
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225 settings.callback.call(img);
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226 }
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227 };
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228
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229 img.src = settings.url;
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230 });
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231 };
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232
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233 $.fn.zoom.defaults = defaults;
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234 }(window.jQuery));