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annotate client/digitallibrary/jquery/jquery.digilib.regions.js @ 832:e4133946a9ad jquery

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display regions as HTML for use in digilib element
author hertzhaft
date Tue, 01 Mar 2011 01:31:26 +0100
parents f0a5e4d2cba7
children 9fa078dcb493
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1 /** optional digilib regions plugin
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2
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3 markup a digilib image with rectangular regions
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4
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5 TODO:
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6 - store region in params/cookie, regarding zoom, mirror, rotation (like marks)
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7 - set regions programmatically
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8 - read regions from params/cookie and display
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9 - backlink mechanism
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10 - don't write to data.settings?
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11 */
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12
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13 (function($) {
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14 // the digilib object
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15 var digilib;
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16 // the data object passed by digilib
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17 var data;
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18 // the functions made available by digilib
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19 var fn;
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20 // affine geometry plugin
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21 var geom;
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22
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23 var FULL_AREA;
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24
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25 var ID_PREFIX = "digilib-region-";
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26
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27 var buttons = {
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28 addregion : {
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29 onclick : "defineRegion",
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30 tooltip : "define a region",
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31 icon : "addregion.png"
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32 },
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33 delregion : {
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34 onclick : "removeRegion",
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35 tooltip : "delete the last region",
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36 icon : "delregion.png"
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37 },
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38 regions : {
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39 onclick : "toggleRegions",
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40 tooltip : "show or hide regions",
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41 icon : "regions.png"
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42 },
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43 regionhtml : {
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44 onclick : "showRegionHTML",
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45 tooltip : "show information about regions",
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46 icon : "regioninfo.png"
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47 }
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48 };
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49
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50 var defaults = {
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51 // are regions shown?
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52 'isRegionVisible' : true,
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53 // are region numbers shown?
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54 'showRegionNumbers' : false,
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55 // is window with region HTML shown?
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56 'showRegionHTML' : false,
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57 // should digilib look for region content in the page?
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58 'includeRegionContent' : false,
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59 // turn any region into a clickable link to its detail view
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60 'autoRegionLinks' : false,
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61 // class name for content divs (must additionally be marked with class "keep")
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62 'regionContentSelector' : 'div.regioncontent',
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63 // buttonset of this plugin
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64 'regionSet' : ['regions', 'addregion', 'delregion', 'regionhtml', 'lessoptions'],
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65 // url param for regions
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66 'rg' : null,
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67 };
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68
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69 var actions = {
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70
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71 // define a region interactively with two clicked points
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72 "defineRegion" : function(data) {
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73 if (!data.settings.isRegionVisible) {
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74 alert("Please turn on regions visibility!");
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75 return;
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76 }
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77 var $elem = data.$elem;
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78 var $body = $('body');
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79 var bodyRect = geom.rectangle($body);
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80 var $scaler = data.$scaler;
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81 var scalerRect = geom.rectangle($scaler);
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82 var pt1, pt2;
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83 // overlay prevents other elements from reacting to mouse events
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84 var $overlay = $('<div class="digilib-overlay"/>');
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85 $body.append($overlay);
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86 bodyRect.adjustDiv($overlay);
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87 var $regionDiv = addRegionDiv(data, data.regions.length);
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88
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89 // mousedown handler: start sizing
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90 var regionStart = function (evt) {
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91 pt1 = geom.position(evt);
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92 // setup and show zoom div
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93 pt1.adjustDiv($regionDiv);
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94 $regionDiv.width(0).height(0);
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95 $regionDiv.show();
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96 // register mouse events
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97 $overlay.bind("mousemove.dlRegion", regionMove);
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98 $overlay.bind("mouseup.dlRegion", regionEnd);
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99 return false;
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100 };
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101
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102 // mousemove handler: size region
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103 var regionMove = function (evt) {
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104 pt2 = geom.position(evt);
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105 var rect = geom.rectangle(pt1, pt2);
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106 rect.clipTo(scalerRect);
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107 // update region
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108 rect.adjustDiv($regionDiv);
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109 return false;
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110 };
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111
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112 // mouseup handler: end sizing
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113 var regionEnd = function (evt) {
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114 pt2 = geom.position(evt);
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115 // assume a click and continue if the area is too small
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116 var clickRect = geom.rectangle(pt1, pt2);
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117 if (clickRect.getArea() <= 5) return false;
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118 // unregister mouse events and get rid of overlay
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119 $overlay.unbind("mousemove.dlRegion", regionMove);
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120 $overlay.unbind("mouseup.dlRegion", regionEnd);
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121 $overlay.remove();
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122 // clip region
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123 clickRect.clipTo(scalerRect);
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124 clickRect.adjustDiv($regionDiv);
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125 storeRegion(data, $regionDiv);
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126 // fn.redisplay(data);
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127 fn.highlightButtons(data, 'addregion', 0);
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128 redisplay(data);
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129 return false;
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130 };
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131
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132 // bind start zoom handler
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133 $overlay.one('mousedown.dlRegion', regionStart);
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134 fn.highlightButtons(data, 'addregion', 1);
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135 },
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136
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137 // remove the last added region
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138 "removeRegion" : function (data) {
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139 if (!data.settings.isRegionVisible) {
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140 alert("Please turn on regions visibility!");
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141 return;
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142 }
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143 var region = data.regions.pop();
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144 if (region == null) return;
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145 var $regionDiv = region.$div;
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146 $regionDiv.remove();
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147 redisplay(data);
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148 },
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149
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150 // show/hide regions
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151 "toggleRegions" : function (data) {
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152 var show = !data.settings.isRegionVisible;
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153 data.settings.isRegionVisible = show;
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154 fn.highlightButtons(data, 'regions', show);
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155 showRegionDivs(data, 1);
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156 },
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157
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158 // show/hide region HTML code
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159 "showRegionHTML" : function (data) {
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160 var show = !data.settings.showRegionHTML;
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161 data.settings.showRegionHTML = show;
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162 fn.highlightButtons(data, 'regionhtml', show);
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163 var $html = data.$htmlDiv;
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164 if (!show) {
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165 $html.fadeOut(function () {
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166 $html.contents().remove();
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167 });
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168 return;
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169 }
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170 // empty the div for HTML display
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171 $.each(data.regions, function(index, region) {
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172 var title = "area="
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173 + region.x + "/" + region.y + "/"
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174 + region.width + "/" + region.height;
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175 $html.append($('<div/>').text('<div class="keep regioncontent" title="' + title + '">'));
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176 $html.append($('<div/>').text('</div>'));
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177 });
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178 $html.fadeIn();
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179 }
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180 };
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181
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182 // store a region div
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183 var storeRegion = function (data, $regionDiv) {
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184 var regions = data.regions;
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185 var rect = geom.rectangle($regionDiv);
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186 var regionRect = data.imgTrafo.invtransform(rect);
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187 regionRect.$div = $regionDiv;
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188 regions.push(regionRect);
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189 console.debug("regions", data.regions, "regionRect", regionRect);
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190 };
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191
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192 // add a region to data.$elem
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193 var addRegionDiv = function (data, index) {
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194 var nr = index + 1; // we count regions from 1
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195 // create a digilib URL for this detail
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196 var regionUrl = getRegionUrl(data, index);
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197 var $regionDiv = $('<div class="region overlay" style="display:none"/>');
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198 $regionDiv.attr("id", ID_PREFIX + nr);
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199 data.$elem.append($regionDiv);
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200 if (data.settings.showRegionNumbers) {
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201 var $regionNr = $('<div class="regionnumber"/>');
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202 var $regionLink = $('<a/>');
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203 $regionLink.attr('href', regionUrl);
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204 $regionLink.text(nr);
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205 $regionNr.append($regionLink);
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206 $regionDiv.append($regionNr);
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207 }
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208 if (data.settings.autoRegionLinks) {
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209 $regionDiv.bind('click.dlRegion', function() {
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210 window.location = regionUrl;
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211 })
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212 }
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213 return $regionDiv;
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214 };
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215
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216 // add region content
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217 var addRegionContent = function (region, $elem) {
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218 var $regionDiv = region.$div;
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219 $regionDiv.append($elem);
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220 }
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221
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222 // create a region div from the data.regions collection
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223 var createRegionDiv = function (regions, index) {
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224 var region = regions[index];
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225 var $regionDiv = addRegionDiv(data, index);
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226 region.$div = $regionDiv;
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227 return $regionDiv;
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228 };
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229
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230 // create regions
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231 var createRegionDivs = function (data) {
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232 var regions = data.regions;
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233 $.each(regions, function(i) {
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234 createRegionDiv(regions, i);
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235 });
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236 };
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237
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238 // create regions from HTML
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239 var createRegionsFromHTML = function (data) {
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240 var regions = data.regions;
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241 var selector = data.settings.regionContentSelector;
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242 var $content = data.$elem.find(selector);
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243 console.debug("createRegionsFromHTML", $content);
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244 $content.each(function(index, elem) {
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245 var $div = $(elem);
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246 var title = $div.attr('title');
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247 var r = title.replace(/^area=/i, '');
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248 var pos = r.split("/", 4);
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249 var rect = geom.rectangle(pos[0], pos[1], pos[2], pos[3]);
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250 regions.push(rect);
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251 var $regionDiv = createRegionDiv(regions, index);
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252 $regionDiv.append($div);
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253 $div.show();
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254 });
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255 };
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256
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257 // show a region on top of the scaler image
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258 var showRegionDiv = function (data, index, anim) {
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259 if (!data.imgTrafo) return;
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260 var $elem = data.$elem;
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261 var regions = data.regions;
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262 if (index > regions.length) return;
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263 var region = regions[index]
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264 var $regionDiv = region.$div;
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265 if (!$regionDiv) {
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266 console.debug("showRegionDiv: region has no $div", region);
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267 // alert("showRegionDiv: region has no $div to show");
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268 return;
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269 }
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270 var regionRect = region.copy();
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271 var show = data.settings.isRegionVisible;
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272 if (show && data.zoomArea.overlapsRect(regionRect)) {
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273 regionRect.clipTo(data.zoomArea);
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274 var screenRect = data.imgTrafo.transform(regionRect);
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275 screenRect.adjustDiv($regionDiv);
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276 if (anim) {
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277 $regionDiv.fadeIn();
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278 } else{
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279 $regionDiv.show();
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280 }
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281 } else {
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282 if (anim) {
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283 $regionDiv.fadeOut();
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284 } else{
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285 $regionDiv.hide();
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286 }
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287 }
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288 };
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289
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290 // show regions
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291 var showRegionDivs = function (data, anim) {
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292 for (var i = 0; i < data.regions.length ; i++) {
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293 showRegionDiv(data, i, anim);
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294 }
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295 };
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296
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297 var unpackRegions = function (data) {
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298 // create regions from parameters
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299 var rg = data.settings.rg;
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300 if (rg == null) return;
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301 var regions = data.regions;
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302 var rs = rg.split(",");
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303 for (var i = 0; i < rs.length; i++) {
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304 var r = rs[i];
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305 var pos = r.split("/", 4);
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306 var rect = geom.rectangle(pos[0], pos[1], pos[2], pos[3]);
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307 regions.push(rect);
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308 }
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309 };
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310
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311 // pack regions array into a parameter string
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312 var packRegions = function (data) {
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313 var regions = data.regions;
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314 if (!regions.length) {
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315 data.settings.rg = null;
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316 return;
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317 }
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318 var rg = '';
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319 for (var i = 0; i < regions.length; i++) {
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320 region = regions[i];
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321 if (i) {
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322 rg += ',';
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323 }
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324 rg += [
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325 fn.cropFloatStr(region.x),
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326 fn.cropFloatStr(region.y),
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327 fn.cropFloatStr(region.width),
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328 fn.cropFloatStr(region.height)
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329 ].join('/');
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330 }
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331 data.settings.rg = rg;
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332 };
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333
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334 // reload display after a region has been added or removed
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335 var redisplay = function (data) {
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336 if (!data.settings.includeRegionContent) {
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337 packRegions(data);
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338 }
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339 fn.redisplay(data);
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340 };
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341
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342 // for turning region numbers/region divs into links to zoomed details
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343 var getRegionUrl = function (data, index) {
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344 var region = data.regions[index];
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345 var settings = data.settings;
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346 var params = {
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347 "fn" : settings.fn,
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348 "pn" : settings.pn
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349 };
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350 fn.packArea(params, region);
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351 fn.packMarks(params, data.marks);
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352 fn.packScalerFlags(params, data.scalerFlags);
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353 var paramNames = digilib.defaults.digilibParamNames;
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354 // build our own digilib URL without storing anything
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355 var queryString = fn.getParamString(params, paramNames, digilib.defaults);
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356 return settings.digilibBaseUrl + '?' + queryString;
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357 };
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358
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359 // event handler, reads region parameter and creates region divs
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360 var handleSetup = function (evt) {
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361 data = this;
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362 console.debug("regions: handleSetup", data.settings.rg);
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363 // regions with content are given in HTML divs
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364 if (data.settings.includeRegionContent) {
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365 createRegionsFromHTML(data);
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366 // regions are defined in the URL
818
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367 } else {
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368 unpackRegions(data);
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369 createRegionDivs(data);
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370 fn.highlightButtons(data, 'regionhtml', data.settings.showRegionHTML);
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371 }
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372 };
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373
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374 // event handler, sets buttons and shows regions
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375 var handleUpdate = function (evt) {
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376 data = this;
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377 fn.highlightButtons(data, 'regions' , data.settings.isRegionVisible);
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378 fn.highlightButtons(data, 'regionhtml' , data.settings.showRegionHTML);
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379 showRegionDivs(data);
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380 console.debug("regions: handleUpdate", data.settings.rg);
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381 };
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382
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383 // event handler, redisplays regions (e.g. in a new position)
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384 var handleRedisplay = function (evt) {
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385 data = this;
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386 showRegionDivs(data);
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387 console.debug("regions: handleRedisplay");
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388 };
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389
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390 // event handler
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391 var handleDragZoom = function (evt, zoomArea) {
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392 // console.debug("regions: handleDragZoom, zoomArea:", zoomArea);
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393 // data = this;
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394 };
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395
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396 // plugin installation called by digilib on plugin object.
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397 var install = function(plugin) {
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398 digilib = plugin;
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399 console.debug('installing regions plugin. digilib:', digilib);
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400 fn = digilib.fn;
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401 // import geometry classes
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402 geom = fn.geometry;
799
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403 FULL_AREA = geom.rectangle(0,0,1,1);
808
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404 // add defaults, actions, buttons
799
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405 $.extend(digilib.defaults, defaults);
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406 $.extend(digilib.actions, actions);
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407 $.extend(digilib.buttons, buttons);
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408 };
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409
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410 // plugin initialization
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411 var init = function (data) {
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412 console.debug('initialising regions plugin. data:', data);
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413 var $data = $(data);
823
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414 // regions array
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415 data.regions = [];
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416 // regions HTML div
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417 var $html = $('<div class="keep regionhtml"/>');
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418 data.$htmlDiv = $html;
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419 data.$elem.append($html);
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420 // no URL-defined regions, no buttons when regions are predefined in HTML
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421 if (!data.settings.includeRegionContent) {
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422 // add "rg" to digilibParamNames
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423 data.settings.digilibParamNames.push('rg');
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424 // additional buttons
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425 var buttonSettings = data.settings.buttonSettings.fullscreen;
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426 // configure buttons through digilib "regionSet" option
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427 var buttonSet = data.settings.regionSet || regionSet;
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428 // set regionSet to [] or '' for no buttons (when showing regions only)
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429 if (buttonSet.length && buttonSet.length > 0) {
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430 buttonSettings['regionSet'] = buttonSet;
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431 buttonSettings.buttonSets.push('regionSet');
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432 }
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433 }
799
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434 // install event handler
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435 $data.bind('setup', handleSetup);
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436 $data.bind('update', handleUpdate);
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437 $data.bind('redisplay', handleRedisplay);
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438 $data.bind('dragZoom', handleDragZoom);
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439 };
799
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440
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441 // plugin object with name and install/init methods
799
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442 // shared objects filled by digilib on registration
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443 var pluginProperties = {
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444 name : 'region',
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445 install : install,
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446 init : init,
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447 buttons : {},
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448 actions : {},
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449 fn : {},
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450 plugins : {}
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451 };
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452
792
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453 if ($.fn.digilib == null) {
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454 $.error("jquery.digilib.regions must be loaded after jquery.digilib!");
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455 } else {
799
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456 $.fn.digilib('plugin', pluginProperties);
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457 }
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458 })(jQuery);