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annotate geotemco/lib/simile/ajax/scripts/graphics.js @ 0:b12c99b7c3f0

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commit for previous development
author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Mon, 19 Jan 2015 17:13:49 +0100
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1 /**
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2 * @fileOverview Graphics utility functions and constants
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3 * @name SimileAjax.Graphics
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4 */
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5
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6 SimileAjax.Graphics = new Object();
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7
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8 /**
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9 * A boolean value indicating whether PNG translucency is supported on the
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10 * user's browser or not.
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11 *
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12 * @type Boolean
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13 */
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14 SimileAjax.Graphics.pngIsTranslucent = (!SimileAjax.Platform.browser.isIE) || (SimileAjax.Platform.browser.majorVersion > 6);
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15 if (!SimileAjax.Graphics.pngIsTranslucent) {
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16 SimileAjax.includeCssFile(document, SimileAjax.urlPrefix + "styles/graphics-ie6.css");
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17 }
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18
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19 /*==================================================
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20 * Opacity, translucency
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21 *==================================================
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22 */
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23 SimileAjax.Graphics._createTranslucentImage1 = function(url, verticalAlign) {
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24 var elmt = document.createElement("img");
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25 elmt.setAttribute("src", url);
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26 if (verticalAlign != null) {
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27 elmt.style.verticalAlign = verticalAlign;
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28 }
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29 return elmt;
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30 };
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31 SimileAjax.Graphics._createTranslucentImage2 = function(url, verticalAlign) {
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32 var elmt = document.createElement("img");
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33 elmt.style.width = "1px"; // just so that IE will calculate the size property
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34 elmt.style.height = "1px";
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35 elmt.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + url +"', sizingMethod='image')";
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36 elmt.style.verticalAlign = (verticalAlign != null) ? verticalAlign : "middle";
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37 return elmt;
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38 };
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39
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40 /**
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41 * Creates a DOM element for an <code>img</code> tag using the URL given. This
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42 * is a convenience method that automatically includes the necessary CSS to
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43 * allow for translucency, even on IE.
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44 *
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45 * @function
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46 * @param {String} url the URL to the image
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47 * @param {String} verticalAlign the CSS value for the image's vertical-align
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48 * @return {Element} a DOM element containing the <code>img</code> tag
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49 */
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50 SimileAjax.Graphics.createTranslucentImage = SimileAjax.Graphics.pngIsTranslucent ?
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51 SimileAjax.Graphics._createTranslucentImage1 :
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52 SimileAjax.Graphics._createTranslucentImage2;
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53
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54 SimileAjax.Graphics._createTranslucentImageHTML1 = function(url, verticalAlign) {
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55 return "<img src=\"" + url + "\"" +
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56 (verticalAlign != null ? " style=\"vertical-align: " + verticalAlign + ";\"" : "") +
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57 " />";
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58 };
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59 SimileAjax.Graphics._createTranslucentImageHTML2 = function(url, verticalAlign) {
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60 var style =
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61 "width: 1px; height: 1px; " +
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62 "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + url +"', sizingMethod='image');" +
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63 (verticalAlign != null ? " vertical-align: " + verticalAlign + ";" : "");
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64
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65 return "<img src='" + url + "' style=\"" + style + "\" />";
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66 };
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67
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68 /**
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69 * Creates an HTML string for an <code>img</code> tag using the URL given.
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70 * This is a convenience method that automatically includes the necessary CSS
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71 * to allow for translucency, even on IE.
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72 *
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73 * @function
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74 * @param {String} url the URL to the image
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75 * @param {String} verticalAlign the CSS value for the image's vertical-align
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76 * @return {String} a string containing the <code>img</code> tag
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77 */
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78 SimileAjax.Graphics.createTranslucentImageHTML = SimileAjax.Graphics.pngIsTranslucent ?
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79 SimileAjax.Graphics._createTranslucentImageHTML1 :
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80 SimileAjax.Graphics._createTranslucentImageHTML2;
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81
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82 /**
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83 * Sets the opacity on the given DOM element.
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84 *
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85 * @param {Element} elmt the DOM element to set the opacity on
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86 * @param {Number} opacity an integer from 0 to 100 specifying the opacity
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87 */
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88 SimileAjax.Graphics.setOpacity = function(elmt, opacity) {
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89 if (SimileAjax.Platform.browser.isIE) {
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90 elmt.style.filter = "progid:DXImageTransform.Microsoft.Alpha(Style=0,Opacity=" + opacity + ")";
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91 } else {
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92 var o = (opacity / 100).toString();
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93 elmt.style.opacity = o;
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94 elmt.style.MozOpacity = o;
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95 }
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96 };
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97
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98 /*==================================================
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99 * Bubble
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100 *==================================================
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101 */
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102
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103 SimileAjax.Graphics.bubbleConfig = {
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104 containerCSSClass: "simileAjax-bubble-container",
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105 innerContainerCSSClass: "simileAjax-bubble-innerContainer",
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106 contentContainerCSSClass: "simileAjax-bubble-contentContainer",
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107
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108 borderGraphicSize: 50,
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109 borderGraphicCSSClassPrefix: "simileAjax-bubble-border-",
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110
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111 arrowGraphicTargetOffset: 33, // from tip of arrow to the side of the graphic that touches the content of the bubble
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112 arrowGraphicLength: 100, // dimension of arrow graphic along the direction that the arrow points
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113 arrowGraphicWidth: 49, // dimension of arrow graphic perpendicular to the direction that the arrow points
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114 arrowGraphicCSSClassPrefix: "simileAjax-bubble-arrow-",
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115
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116 closeGraphicCSSClass: "simileAjax-bubble-close",
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117
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118 extraPadding: 20
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119 };
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120
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121 /**
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122 * Creates a nice, rounded bubble popup with the given content in a div,
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123 * page coordinates and a suggested width. The bubble will point to the
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124 * location on the page as described by pageX and pageY. All measurements
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125 * should be given in pixels.
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126 *
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127 * @param {Element} the content div
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128 * @param {Number} pageX the x coordinate of the point to point to
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129 * @param {Number} pageY the y coordinate of the point to point to
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130 * @param {Number} contentWidth a suggested width of the content
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131 * @param {String} orientation a string ("top", "bottom", "left", or "right")
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132 * that describes the orientation of the arrow on the bubble
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133 * @param {Number} maxHeight. Add a scrollbar div if bubble would be too tall.
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134 * Default of 0 or null means no maximum
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135 */
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136 SimileAjax.Graphics.createBubbleForContentAndPoint = function(
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137 div, pageX, pageY, contentWidth, orientation, maxHeight) {
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138 if (typeof contentWidth != "number") {
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139 contentWidth = 300;
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140 }
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141 if (typeof maxHeight != "number") {
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142 maxHeight = 0;
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143 }
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144
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145 div.style.position = "absolute";
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146 div.style.left = "-5000px";
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147 div.style.top = "0px";
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148 div.style.width = contentWidth + "px";
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149 document.body.appendChild(div);
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150
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151 window.setTimeout(function() {
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152 var width = div.scrollWidth + 10;
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153 var height = div.scrollHeight + 10;
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154 var scrollDivW = 0; // width of the possible inner container when we want vertical scrolling
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155 if (maxHeight > 0 && height > maxHeight) {
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156 height = maxHeight;
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157 scrollDivW = width - 25;
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158 }
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159
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160 var bubble = SimileAjax.Graphics.createBubbleForPoint(pageX, pageY, width, height, orientation);
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161
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162 document.body.removeChild(div);
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163 div.style.position = "static";
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164 div.style.left = "";
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165 div.style.top = "";
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166
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167 // create a scroll div if needed
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168 if (scrollDivW > 0) {
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169 var scrollDiv = document.createElement("div");
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170 div.style.width = "";
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171 scrollDiv.style.width = scrollDivW + "px";
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172 scrollDiv.appendChild(div);
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173 bubble.content.appendChild(scrollDiv);
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174 } else {
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175 div.style.width = width + "px";
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176 bubble.content.appendChild(div);
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177 }
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178 }, 200);
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179 };
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180
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181 /**
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182 * Creates a nice, rounded bubble popup with the given page coordinates and
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183 * content dimensions. The bubble will point to the location on the page
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184 * as described by pageX and pageY. All measurements should be given in
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185 * pixels.
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186 *
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187 * @param {Number} pageX the x coordinate of the point to point to
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188 * @param {Number} pageY the y coordinate of the point to point to
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189 * @param {Number} contentWidth the width of the content box in the bubble
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190 * @param {Number} contentHeight the height of the content box in the bubble
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191 * @param {String} orientation a string ("top", "bottom", "left", or "right")
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192 * that describes the orientation of the arrow on the bubble
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193 * @return {Element} a DOM element for the newly created bubble
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194 */
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195 SimileAjax.Graphics.createBubbleForPoint = function(pageX, pageY, contentWidth, contentHeight, orientation) {
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196 contentWidth = parseInt(contentWidth, 10); // harden against bad input bugs
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197 contentHeight = parseInt(contentHeight, 10); // getting numbers-as-strings
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198
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199 var bubbleConfig = SimileAjax.Graphics.bubbleConfig;
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200 var pngTransparencyClassSuffix =
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201 SimileAjax.Graphics.pngIsTranslucent ? "pngTranslucent" : "pngNotTranslucent";
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202
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203 var bubbleWidth = contentWidth + 2 * bubbleConfig.borderGraphicSize;
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204 var bubbleHeight = contentHeight + 2 * bubbleConfig.borderGraphicSize;
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205
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206 var generatePngSensitiveClass = function(className) {
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207 return className + " " + className + "-" + pngTransparencyClassSuffix;
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208 };
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209
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210 /*
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211 * Render container divs
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212 */
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213 var div = document.createElement("div");
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214 div.className = generatePngSensitiveClass(bubbleConfig.containerCSSClass);
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215 div.style.width = contentWidth + "px";
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216 div.style.height = contentHeight + "px";
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217
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218 var divInnerContainer = document.createElement("div");
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219 divInnerContainer.className = generatePngSensitiveClass(bubbleConfig.innerContainerCSSClass);
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220 div.appendChild(divInnerContainer);
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221
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222 /*
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223 * Create layer for bubble
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224 */
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225 var close = function() {
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226 if (!bubble._closed) {
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227 document.body.removeChild(bubble._div);
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228 bubble._doc = null;
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229 bubble._div = null;
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230 bubble._content = null;
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231 bubble._closed = true;
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232 }
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233 }
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234 var bubble = { _closed: false };
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235 var layer = SimileAjax.WindowManager.pushLayer(close, true, div);
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236 bubble._div = div;
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237 bubble.close = function() { SimileAjax.WindowManager.popLayer(layer); }
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238
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239 /*
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240 * Render border graphics
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241 */
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242 var createBorder = function(classNameSuffix) {
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243 var divBorderGraphic = document.createElement("div");
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244 divBorderGraphic.className = generatePngSensitiveClass(bubbleConfig.borderGraphicCSSClassPrefix + classNameSuffix);
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245 divInnerContainer.appendChild(divBorderGraphic);
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246 };
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247 createBorder("top-left");
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248 createBorder("top-right");
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249 createBorder("bottom-left");
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250 createBorder("bottom-right");
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251 createBorder("left");
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252 createBorder("right");
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253 createBorder("top");
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254 createBorder("bottom");
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255
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256 /*
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257 * Render content
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258 */
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259 var divContentContainer = document.createElement("div");
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260 divContentContainer.className = generatePngSensitiveClass(bubbleConfig.contentContainerCSSClass);
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261 divInnerContainer.appendChild(divContentContainer);
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262 bubble.content = divContentContainer;
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263
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264 /*
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265 * Render close button
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266 */
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267 var divClose = document.createElement("div");
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268 divClose.className = generatePngSensitiveClass(bubbleConfig.closeGraphicCSSClass);
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269 divInnerContainer.appendChild(divClose);
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270 SimileAjax.WindowManager.registerEventWithObject(divClose, "click", bubble, "close");
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271
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272 (function() {
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273 var dims = SimileAjax.Graphics.getWindowDimensions();
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274 var docWidth = dims.w;
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275 var docHeight = dims.h;
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276
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277 var halfArrowGraphicWidth = Math.ceil(bubbleConfig.arrowGraphicWidth / 2);
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278
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279 var createArrow = function(classNameSuffix) {
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280 var divArrowGraphic = document.createElement("div");
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281 divArrowGraphic.className = generatePngSensitiveClass(bubbleConfig.arrowGraphicCSSClassPrefix + "point-" + classNameSuffix);
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282 divInnerContainer.appendChild(divArrowGraphic);
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283 return divArrowGraphic;
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284 };
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285
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286 if (pageX - halfArrowGraphicWidth - bubbleConfig.borderGraphicSize - bubbleConfig.extraPadding > 0 &&
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287 pageX + halfArrowGraphicWidth + bubbleConfig.borderGraphicSize + bubbleConfig.extraPadding < docWidth) {
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288
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289 /*
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290 * Bubble can be positioned above or below the target point.
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291 */
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292
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293 var left = pageX - Math.round(contentWidth / 2);
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294 left = pageX < (docWidth / 2) ?
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295 Math.max(left, bubbleConfig.extraPadding + bubbleConfig.borderGraphicSize) :
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296 Math.min(left, docWidth - bubbleConfig.extraPadding - bubbleConfig.borderGraphicSize - contentWidth);
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297
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298 if ((orientation && orientation == "top") ||
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299 (!orientation &&
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300 (pageY
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301 - bubbleConfig.arrowGraphicTargetOffset
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302 - contentHeight
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303 - bubbleConfig.borderGraphicSize
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304 - bubbleConfig.extraPadding > 0))) {
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305
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306 /*
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307 * Position bubble above the target point.
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308 */
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309
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310 var divArrow = createArrow("down");
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311 divArrow.style.left = (pageX - halfArrowGraphicWidth - left) + "px";
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312
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313 div.style.left = left + "px";
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314 div.style.top = (pageY - bubbleConfig.arrowGraphicTargetOffset - contentHeight) + "px";
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315
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316 return;
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317 } else if ((orientation && orientation == "bottom") ||
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318 (!orientation &&
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319 (pageY
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320 + bubbleConfig.arrowGraphicTargetOffset
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321 + contentHeight
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322 + bubbleConfig.borderGraphicSize
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323 + bubbleConfig.extraPadding < docHeight))) {
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324
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325 /*
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326 * Position bubble below the target point.
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327 */
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328
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329 var divArrow = createArrow("up");
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330 divArrow.style.left = (pageX - halfArrowGraphicWidth - left) + "px";
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331
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332 div.style.left = left + "px";
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333 div.style.top = (pageY + bubbleConfig.arrowGraphicTargetOffset) + "px";
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334
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335 return;
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336 }
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337 }
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338
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339 var top = pageY - Math.round(contentHeight / 2);
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340 top = pageY < (docHeight / 2) ?
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341 Math.max(top, bubbleConfig.extraPadding + bubbleConfig.borderGraphicSize) :
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342 Math.min(top, docHeight - bubbleConfig.extraPadding - bubbleConfig.borderGraphicSize - contentHeight);
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343
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344 if ((orientation && orientation == "left") ||
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345 (!orientation &&
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346 (pageX
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347 - bubbleConfig.arrowGraphicTargetOffset
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348 - contentWidth
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349 - bubbleConfig.borderGraphicSize
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350 - bubbleConfig.extraPadding > 0))) {
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351
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352 /*
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353 * Position bubble left of the target point.
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354 */
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355
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356 var divArrow = createArrow("right");
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357 divArrow.style.top = (pageY - halfArrowGraphicWidth - top) + "px";
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358
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359 div.style.top = top + "px";
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360 div.style.left = (pageX - bubbleConfig.arrowGraphicTargetOffset - contentWidth) + "px";
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361 } else {
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362
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363 /*
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364 * Position bubble right of the target point, as the last resort.
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365 */
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366
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367 var divArrow = createArrow("left");
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368 divArrow.style.top = (pageY - halfArrowGraphicWidth - top) + "px";
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369
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370 div.style.top = top + "px";
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371 div.style.left = (pageX + bubbleConfig.arrowGraphicTargetOffset) + "px";
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372 }
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373 })();
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374
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375 document.body.appendChild(div);
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376
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377 return bubble;
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378 };
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379
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380 SimileAjax.Graphics.getWindowDimensions = function() {
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381 if (typeof window.innerHeight == 'number') {
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382 return { w:window.innerWidth, h:window.innerHeight }; // Non-IE
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383 } else if (document.documentElement && document.documentElement.clientHeight) {
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384 return { // IE6+, in "standards compliant mode"
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385 w:document.documentElement.clientWidth,
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386 h:document.documentElement.clientHeight
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387 };
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388 } else if (document.body && document.body.clientHeight) {
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389 return { // IE 4 compatible
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390 w:document.body.clientWidth,
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391 h:document.body.clientHeight
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392 };
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393 }
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394 };
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395
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396
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397 /**
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398 * Creates a floating, rounded message bubble in the center of the window for
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399 * displaying modal information, e.g. "Loading..."
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400 *
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401 * @param {Document} doc the root document for the page to render on
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402 * @param {Object} an object with two properties, contentDiv and containerDiv,
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403 * consisting of the newly created DOM elements
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404 */
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405 SimileAjax.Graphics.createMessageBubble = function(doc) {
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406 var containerDiv = doc.createElement("div");
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407 if (SimileAjax.Graphics.pngIsTranslucent) {
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408 var topDiv = doc.createElement("div");
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409 topDiv.style.height = "33px";
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410 topDiv.style.background = "url(" + SimileAjax.urlPrefix + "images/message-top-left.png) top left no-repeat";
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411 topDiv.style.paddingLeft = "44px";
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412 containerDiv.appendChild(topDiv);
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413
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414 var topRightDiv = doc.createElement("div");
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415 topRightDiv.style.height = "33px";
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416 topRightDiv.style.background = "url(" + SimileAjax.urlPrefix + "images/message-top-right.png) top right no-repeat";
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417 topDiv.appendChild(topRightDiv);
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418
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419 var middleDiv = doc.createElement("div");
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420 middleDiv.style.background = "url(" + SimileAjax.urlPrefix + "images/message-left.png) top left repeat-y";
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421 middleDiv.style.paddingLeft = "44px";
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422 containerDiv.appendChild(middleDiv);
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423
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424 var middleRightDiv = doc.createElement("div");
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425 middleRightDiv.style.background = "url(" + SimileAjax.urlPrefix + "images/message-right.png) top right repeat-y";
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426 middleRightDiv.style.paddingRight = "44px";
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427 middleDiv.appendChild(middleRightDiv);
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428
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429 var contentDiv = doc.createElement("div");
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430 middleRightDiv.appendChild(contentDiv);
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431
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432 var bottomDiv = doc.createElement("div");
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433 bottomDiv.style.height = "55px";
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434 bottomDiv.style.background = "url(" + SimileAjax.urlPrefix + "images/message-bottom-left.png) bottom left no-repeat";
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435 bottomDiv.style.paddingLeft = "44px";
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436 containerDiv.appendChild(bottomDiv);
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437
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438 var bottomRightDiv = doc.createElement("div");
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439 bottomRightDiv.style.height = "55px";
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440 bottomRightDiv.style.background = "url(" + SimileAjax.urlPrefix + "images/message-bottom-right.png) bottom right no-repeat";
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441 bottomDiv.appendChild(bottomRightDiv);
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442 } else {
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443 containerDiv.style.border = "2px solid #7777AA";
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444 containerDiv.style.padding = "20px";
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445 containerDiv.style.background = "white";
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446 SimileAjax.Graphics.setOpacity(containerDiv, 90);
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447
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448 var contentDiv = doc.createElement("div");
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449 containerDiv.appendChild(contentDiv);
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450 }
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451
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452 return {
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453 containerDiv: containerDiv,
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454 contentDiv: contentDiv
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455 };
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456 };
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457
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458 /*==================================================
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459 * Animation
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460 *==================================================
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461 */
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462
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463 /**
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464 * Creates an animation for a function, and an interval of values. The word
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465 * "animation" here is used in the sense of repeatedly calling a function with
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466 * a current value from within an interval, and a delta value.
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467 *
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468 * @param {Function} f a function to be called every 50 milliseconds throughout
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469 * the animation duration, of the form f(current, delta), where current is
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470 * the current value within the range and delta is the current change.
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471 * @param {Number} from a starting value
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472 * @param {Number} to an ending value
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473 * @param {Number} duration the duration of the animation in milliseconds
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474 * @param {Function} [cont] an optional function that is called at the end of
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475 * the animation, i.e. a continuation.
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476 * @return {SimileAjax.Graphics._Animation} a new animation object
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477 */
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478 SimileAjax.Graphics.createAnimation = function(f, from, to, duration, cont) {
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479 return new SimileAjax.Graphics._Animation(f, from, to, duration, cont);
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480 };
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481
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482 SimileAjax.Graphics._Animation = function(f, from, to, duration, cont) {
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483 this.f = f;
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484 this.cont = (typeof cont == "function") ? cont : function() {};
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485
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486 this.from = from;
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487 this.to = to;
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488 this.current = from;
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489
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490 this.duration = duration;
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491 this.start = new Date().getTime();
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492 this.timePassed = 0;
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493 };
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494
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diff changeset
495 /**
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496 * Runs this animation.
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497 */
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498 SimileAjax.Graphics._Animation.prototype.run = function() {
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499 var a = this;
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500 window.setTimeout(function() { a.step(); }, 50);
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diff changeset
501 };
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diff changeset
502
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diff changeset
503 /**
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diff changeset
504 * Increments this animation by one step, and then continues the animation with
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505 * <code>run()</code>.
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506 */
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507 SimileAjax.Graphics._Animation.prototype.step = function() {
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508 this.timePassed += 50;
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509
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510 var timePassedFraction = this.timePassed / this.duration;
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511 var parameterFraction = -Math.cos(timePassedFraction * Math.PI) / 2 + 0.5;
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512 var current = parameterFraction * (this.to - this.from) + this.from;
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513
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514 try {
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515 this.f(current, current - this.current);
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516 } catch (e) {
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517 }
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518 this.current = current;
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519
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520 if (this.timePassed < this.duration) {
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521 this.run();
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522 } else {
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523 this.f(this.to, 0);
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524 this["cont"]();
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525 }
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526 };
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diff changeset
527
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diff changeset
528 /*==================================================
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529 * CopyPasteButton
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530 *
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531 * Adapted from http://spaces.live.com/editorial/rayozzie/demo/liveclip/liveclipsample/techPreview.html.
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diff changeset
532 *==================================================
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533 */
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534
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diff changeset
535 /**
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diff changeset
536 * Creates a button and textarea for displaying structured data and copying it
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537 * to the clipboard. The data is dynamically generated by the given
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538 * createDataFunction parameter.
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539 *
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540 * @param {String} image an image URL to use as the background for the
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diff changeset
541 * generated box
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542 * @param {Number} width the width in pixels of the generated box
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543 * @param {Number} height the height in pixels of the generated box
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544 * @param {Function} createDataFunction a function that is called with no
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545 * arguments to generate the structured data
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546 * @return a new DOM element
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547 */
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548 SimileAjax.Graphics.createStructuredDataCopyButton = function(image, width, height, createDataFunction) {
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549 var div = document.createElement("div");
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550 div.style.position = "relative";
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551 div.style.display = "inline";
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552 div.style.width = width + "px";
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553 div.style.height = height + "px";
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554 div.style.overflow = "hidden";
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555 div.style.margin = "2px";
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556
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557 if (SimileAjax.Graphics.pngIsTranslucent) {
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diff changeset
558 div.style.background = "url(" + image + ") no-repeat";
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diff changeset
559 } else {
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560 div.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + image +"', sizingMethod='image')";
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561 }
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562
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563 var style;
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564 if (SimileAjax.Platform.browser.isIE) {
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565 style = "filter:alpha(opacity=0)";
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566 } else {
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567 style = "opacity: 0";
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568 }
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569 div.innerHTML = "<textarea rows='1' autocomplete='off' value='none' style='" + style + "' />";
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570
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571 var textarea = div.firstChild;
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572 textarea.style.width = width + "px";
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573 textarea.style.height = height + "px";
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574 textarea.onmousedown = function(evt) {
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575 evt = (evt) ? evt : ((event) ? event : null);
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576 if (evt.button == 2) {
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577 textarea.value = createDataFunction();
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578 textarea.select();
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579 }
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580 };
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581
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582 return div;
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583 };
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584
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585 /*==================================================
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586 * getWidthHeight
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587 *==================================================
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588 */
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589 SimileAjax.Graphics.getWidthHeight = function(el) {
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590 // RETURNS hash {width: w, height: h} in pixels
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591
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592 var w, h;
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593 // offsetWidth rounds on FF, so doesn't work for us.
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594 // See https://bugzilla.mozilla.org/show_bug.cgi?id=458617
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595 if (el.getBoundingClientRect == null) {
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596 // use offsetWidth
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597 w = el.offsetWidth;
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598 h = el.offsetHeight;
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599 } else {
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600 // use getBoundingClientRect
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601 var rect = el.getBoundingClientRect();
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602 w = Math.ceil(rect.right - rect.left);
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603 h = Math.ceil(rect.bottom - rect.top);
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604 }
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605 return {
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606 width: w,
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607 height: h
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608 };
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609 };
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610
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611
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612 /*==================================================
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613 * FontRenderingContext
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614 *==================================================
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615 */
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616 SimileAjax.Graphics.getFontRenderingContext = function(elmt, width) {
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617 return new SimileAjax.Graphics._FontRenderingContext(elmt, width);
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618 };
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619
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620 SimileAjax.Graphics._FontRenderingContext = function(elmt, width) {
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621 this._elmt = elmt;
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622 this._elmt.style.visibility = "hidden";
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623 if (typeof width == "string") {
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624 this._elmt.style.width = width;
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625 } else if (typeof width == "number") {
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626 this._elmt.style.width = width + "px";
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627 }
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628 };
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629
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630 SimileAjax.Graphics._FontRenderingContext.prototype.dispose = function() {
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631 this._elmt = null;
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632 };
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633
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634 SimileAjax.Graphics._FontRenderingContext.prototype.update = function() {
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635 this._elmt.innerHTML = "A";
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636 this._lineHeight = this._elmt.offsetHeight;
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637 };
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638
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639 SimileAjax.Graphics._FontRenderingContext.prototype.computeSize = function(text, className) {
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640 // className arg is optional
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641 var el = this._elmt;
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642 el.innerHTML = text;
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643 el.className = className === undefined ? '' : className;
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644 var wh = SimileAjax.Graphics.getWidthHeight(el);
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645 el.className = ''; // reset for the next guy
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646
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647 return wh;
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648 };
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649
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650 SimileAjax.Graphics._FontRenderingContext.prototype.getLineHeight = function() {
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651 return this._lineHeight;
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652 };
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653