Mercurial > hg > digilib

annotate client/digitallibrary/jquery/jquery.digilib.regions.js @ 845:a2b90ad772a0 jquery

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why not use coords attribute for coords?
author hertzhaft
date Mon, 07 Mar 2011 09:54:36 +0100
parents 8aa2891583f1
children a43810d16ee5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 how to display regions correctly in embedded mode?
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7 */
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8
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9 (function($) {
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10 // the digilib object
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11 var digilib;
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12 // the data object passed by digilib
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13 var data;
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14 // the functions made available by digilib
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15 var fn;
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16 // affine geometry plugin
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17 var geom;
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18
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19 var FULL_AREA;
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20
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21 var ID_PREFIX = "digilib-region-";
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22
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23 var buttons = {
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24 addregion : {
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25 onclick : "defineRegion",
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26 tooltip : "define a region",
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27 icon : "addregion.png"
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28 },
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29 delregion : {
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30 onclick : "removeRegion",
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31 tooltip : "delete the last region",
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32 icon : "delregion.png"
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33 },
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34 regions : {
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35 onclick : "toggleRegions",
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36 tooltip : "show or hide regions",
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37 icon : "regions.png"
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38 },
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39 regionhtml : {
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40 onclick : "showRegionHTML",
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41 tooltip : "show information about regions",
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42 icon : "regioninfo.png"
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43 }
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44 };
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45
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46 var defaults = {
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47 // are regions shown?
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48 'isRegionVisible' : true,
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49 // are region numbers shown?
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50 'showRegionNumbers' : false,
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51 // is window with region HTML shown?
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52 'showRegionHTML' : false,
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53 // is there region content in the page?
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54 'hasRegionContent' : false,
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55 // turn any region into a clickable link to its detail view
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56 'autoRegionLinks' : false,
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57 // class name for content divs (must additionally be marked with class "keep")
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58 'regionContentSelector' : 'div.regioncontent',
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59 // buttonset of this plugin
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60 'regionSet' : ['regions', 'addregion', 'delregion', 'regionhtml', 'lessoptions'],
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61 // url param for regions
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62 'rg' : null
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63 };
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64
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65 var actions = {
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66
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67 // define a region interactively with two clicked points
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68 "defineRegion" : function(data) {
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69 if (!data.settings.isRegionVisible) {
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70 alert("Please turn on regions visibility!");
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71 return;
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72 }
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73 var $elem = data.$elem;
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74 var $body = $('body');
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75 var bodyRect = geom.rectangle($body);
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76 var $scaler = data.$scaler;
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77 var scalerRect = geom.rectangle($scaler);
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78 var pt1, pt2;
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79 // overlay prevents other elements from reacting to mouse events
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80 var $overlay = $('<div class="digilib-overlay"/>');
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81 $body.append($overlay);
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82 bodyRect.adjustDiv($overlay);
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83 var $regionDiv = addRegionDiv(data, data.regions.length);
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84
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85 // mousedown handler: start sizing
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86 var regionStart = function (evt) {
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87 pt1 = geom.position(evt);
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88 // setup and show zoom div
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89 pt1.adjustDiv($regionDiv);
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90 $regionDiv.width(0).height(0);
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91 $regionDiv.show();
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92 // register mouse events
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93 $overlay.bind("mousemove.dlRegion", regionMove);
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94 $overlay.bind("mouseup.dlRegion", regionEnd);
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95 return false;
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96 };
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97
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98 // mousemove handler: size region
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99 var regionMove = function (evt) {
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100 pt2 = geom.position(evt);
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101 var rect = geom.rectangle(pt1, pt2);
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102 rect.clipTo(scalerRect);
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103 // update region
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104 rect.adjustDiv($regionDiv);
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105 return false;
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106 };
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107
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108 // mouseup handler: end sizing
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109 var regionEnd = function (evt) {
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110 pt2 = geom.position(evt);
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111 // assume a click and continue if the area is too small
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112 var clickRect = geom.rectangle(pt1, pt2);
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113 if (clickRect.getArea() <= 5) return false;
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114 // unregister mouse events and get rid of overlay
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115 $overlay.unbind("mousemove.dlRegion", regionMove);
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116 $overlay.unbind("mouseup.dlRegion", regionEnd);
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117 $overlay.remove();
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118 // clip region
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119 clickRect.clipTo(scalerRect);
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120 clickRect.adjustDiv($regionDiv);
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121 storeRegion(data, $regionDiv);
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122 // fn.redisplay(data);
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123 fn.highlightButtons(data, 'addregion', 0);
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124 redisplay(data);
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125 return false;
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126 };
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127
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128 // bind start zoom handler
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129 $overlay.one('mousedown.dlRegion', regionStart);
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130 fn.highlightButtons(data, 'addregion', 1);
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131 },
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132
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133 // remove the last added region
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134 "removeRegion" : function (data) {
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135 if (!data.settings.isRegionVisible) {
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136 alert("Please turn on regions visibility!");
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137 return;
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138 }
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139 var region = data.regions.pop();
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140 if (region == null) return;
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141 var $regionDiv = region.$div;
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142 $regionDiv.remove();
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143 redisplay(data);
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144 },
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145
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146 // show/hide regions
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147 "toggleRegions" : function (data) {
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148 var show = !data.settings.isRegionVisible;
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149 data.settings.isRegionVisible = show;
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150 fn.highlightButtons(data, 'regions', show);
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151 renderRegions(data, 1);
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152 },
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153
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154 // show/hide region HTML code
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155 "showRegionHTML" : function (data) {
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156 var show = !data.settings.showRegionHTML;
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157 data.settings.showRegionHTML = show;
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158 fn.highlightButtons(data, 'regionhtml', show);
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159 var $html = data.$htmlDiv;
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160 if (!show) {
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161 $html.fadeOut(function () {
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162 $html.contents().remove();
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163 });
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164 return;
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165 }
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166 // empty the div for HTML display
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167 $html.append($('<div/>').text('<div class="keep regioncontent">'));
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168 $.each(data.regions, function(index, region) {
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169 var area = "area:"
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170 + region.x + "/" + region.y + "/"
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171 + region.width + "/" + region.height;
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172 $html.append($('<div/>').text('<a href="" rel="' + area + '">'));
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173 $html.append($('<div/>').text('</a>'));
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174 });
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175 $html.append($('<div/>').text('</div>'));
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176 $html.fadeIn();
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177 },
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178
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179 "redraw" : function (data) {
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180 renderRegions(data);
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181 }
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182 };
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183
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184 // store a region div
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185 var storeRegion = function (data, $regionDiv) {
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186 var regions = data.regions;
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187 var rect = geom.rectangle($regionDiv);
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188 var regionRect = data.imgTrafo.invtransform(rect);
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189 regionRect.$div = $regionDiv;
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190 regions.push(regionRect);
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191 console.debug("regions", data.regions, "regionRect", regionRect);
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192 };
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193
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194 // add a region to data.$elem
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195 var addRegionDiv = function (data, index, url) {
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196 var nr = index + 1; // we count regions from 1
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197 // create a digilib URL for this detail
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198 url = url || getRegionUrl(data, index);
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199 var $regionDiv = $('<div class="region overlay" style="display:none"/>');
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200 $regionDiv.attr("id", ID_PREFIX + nr);
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201 data.$elem.append($regionDiv);
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202 if (data.settings.showRegionNumbers) {
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203 var $regionLink = $('<a class="regionnumber"/>');
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204 $regionLink.attr('href', url);
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205 $regionLink.text(nr);
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206 $regionDiv.append($regionLink);
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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 = url;
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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 // create a region div from the data.regions array
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217 var createRegionDiv = function (regions, index, url) {
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218 var $regionDiv = addRegionDiv(data, index, url);
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219 var region = regions[index];
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220 region.$div = $regionDiv;
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221 return $regionDiv;
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222 };
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223
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224 // create regions from URL parameters
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225 var createRegionsFromURL = function (data) {
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226 unpackRegions(data);
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227 var regions = data.regions;
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228 $.each(regions, function(i) {
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229 createRegionDiv(regions, i);
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230 });
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231 };
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232
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233 // create regions from HTML
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234 var createRegionsFromHTML = function (data) {
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235 var regions = data.regions;
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236 var selector = data.settings.regionContentSelector;
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237 // regions are defined in "a" tags
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238 var $content = data.$elem.contents(selector).contents('a');
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239 console.debug("createRegionsFromHTML. elems: ", $content);
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240 $content.each(function(index, a) {
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241 var $a = $(a);
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242 // the "coords" attribute contains the region coords (0..1)
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243 var coords = $a.attr('coords');
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244 var pos = coords.split(",", 4);
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245 var rect = geom.rectangle(pos[0], pos[1], pos[2], pos[3]);
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246 regions.push(rect);
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247 // create the div
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248 var href = $a.attr('href');
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249 var $regionDiv = createRegionDiv(regions, index, href);
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250 var $contents = $a.contents().clone();
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251 $regionDiv.append($contents);
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252 });
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253 };
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254
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255 // show a region on top of the scaler image
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256 var renderRegion = function (data, index, anim) {
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257 if (!data.imgTrafo) return;
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258 var $elem = data.$elem;
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259 var regions = data.regions;
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260 if (index > regions.length) return;
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261 var region = regions[index];
806
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262 var $regionDiv = region.$div;
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263 if (!$regionDiv) {
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264 console.debug("renderRegion: region has no $div", region);
76c23870ac0b always show html-defined regions. wrong pos still not fixed
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265 // alert("renderRegion: region has no $div to show");
806
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266 return;
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267 }
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268 var regionRect = region.copy();
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269 var show = data.settings.isRegionVisible;
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270 if (show && data.zoomArea.overlapsRect(regionRect)) {
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271 regionRect.clipTo(data.zoomArea);
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272 var screenRect = data.imgTrafo.transform(regionRect);
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273 console.debug("renderRegion: pos=",geom.position(screenRect));
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274 if (anim) {
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275 $regionDiv.fadeIn();
29de310ed4f3 read regions from HTML (not working yet), show info
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276 } else{
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277 $regionDiv.show();
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278 }
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279 // for some reason adjustDiv sets wrong coords when called BEFORE show()?
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280 screenRect.adjustDiv($regionDiv);
806
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281 } else {
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282 if (anim) {
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diff changeset
283 $regionDiv.fadeOut();
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diff changeset
284 } else{
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285 $regionDiv.hide();
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286 }
806
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287 }
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diff changeset
288 };
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289
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290 // show regions
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291 var renderRegions = function (data, anim) {
806
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292 for (var i = 0; i < data.regions.length ; i++) {
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diff changeset
293 renderRegion(data, i, anim);
806
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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(";");
806
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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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diff changeset
307 regions.push(rect);
785
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parents:
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308 }
4091b0e4dfd7 first step to a regions plugin
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parents:
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309 };
4091b0e4dfd7 first step to a regions plugin
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parents:
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310
806
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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;
808
58dca7a7fe37 could not remove last region
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diff changeset
314 if (!regions.length) {
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diff changeset
315 data.settings.rg = null;
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316 return;
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317 }
806
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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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diff changeset
321 if (i) {
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322 rg += ';';
785
4091b0e4dfd7 first step to a regions plugin
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parents:
diff changeset
323 }
806
4f4f455ebbdb regions plugin works, inclunding event handlers
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diff changeset
324 rg += [
4f4f455ebbdb regions plugin works, inclunding event handlers
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diff changeset
325 fn.cropFloatStr(region.x),
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diff changeset
326 fn.cropFloatStr(region.y),
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diff changeset
327 fn.cropFloatStr(region.width),
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diff changeset
328 fn.cropFloatStr(region.height)
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329 ].join(',');
806
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330 }
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diff changeset
331 data.settings.rg = rg;
785
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332 };
4091b0e4dfd7 first step to a regions plugin
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333
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334 // reload display after a region has been added or removed
806
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diff changeset
335 var redisplay = function (data) {
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diff changeset
336 if (!data.settings.hasRegionContent) {
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337 packRegions(data);
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338 }
806
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339 fn.redisplay(data);
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340 };
806
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diff changeset
341
816
36fbccbaf413 fixed automatic region links and region content
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342 // for turning region numbers/region divs into links to zoomed details
36fbccbaf413 fixed automatic region links and region content
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343 var getRegionUrl = function (data, index) {
36fbccbaf413 fixed automatic region links and region content
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344 var region = data.regions[index];
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345 var settings = data.settings;
816
36fbccbaf413 fixed automatic region links and region content
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346 var params = {
36fbccbaf413 fixed automatic region links and region content
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347 "fn" : settings.fn,
36fbccbaf413 fixed automatic region links and region content
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348 "pn" : settings.pn
36fbccbaf413 fixed automatic region links and region content
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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
792
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360 var handleSetup = function (evt) {
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361 data = this;
806
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362 console.debug("regions: handleSetup", data.settings.rg);
816
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363 // regions with content are given in HTML divs
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364 if (data.settings.hasRegionContent) {
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365 createRegionsFromHTML(data);
816
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366 // regions are defined in the URL
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367 } else {
844
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368 createRegionsFromURL(data);
825
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369 fn.highlightButtons(data, 'regionhtml', data.settings.showRegionHTML);
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370 }
792
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371 };
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372
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373 // event handler, sets buttons and shows regions when scaler img is reloaded
792
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374 var handleUpdate = function (evt) {
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375 data = this;
843
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376 console.debug("regions: handleUpdate");
841
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377 var settings = data.settings;
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378 fn.highlightButtons(data, 'regions' , settings.isRegionVisible);
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379 fn.highlightButtons(data, 'regionhtml' , settings.showRegionHTML);
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380 renderRegions(data);
792
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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)
792
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384 var handleRedisplay = function (evt) {
806
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385 data = this;
792
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386 console.debug("regions: handleRedisplay");
844
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387 // renderRegions(data);
792
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388 };
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389
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390 // event handler
792
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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;
792
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394 };
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395
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396 // plugin installation called by digilib on plugin object.
806
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397 var install = function(plugin) {
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398 digilib = plugin;
801
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399 console.debug('installing regions plugin. digilib:', digilib);
806
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400 fn = digilib.fn;
792
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401 // import geometry classes
806
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402 geom = fn.geometry;
792
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403 FULL_AREA = geom.rectangle(0,0,1,1);
801
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404 // add defaults, actions, buttons
792
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405 $.extend(digilib.defaults, defaults);
52c5595af03e started to adapt regions plugin to new plugin mechanism
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406 $.extend(digilib.actions, actions);
52c5595af03e started to adapt regions plugin to new plugin mechanism
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407 $.extend(digilib.buttons, buttons);
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408 };
52c5595af03e started to adapt regions plugin to new plugin mechanism
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409
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hertzhaft
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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);
828
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413 var $elem = data.$elem;
816
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414 // regions array
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415 data.regions = [];
828
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416 // regions div
7b3e5c666269 predefine region content with a rel=
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417 var $html = $('<div class="keep regionHTML"/>');
7b3e5c666269 predefine region content with a rel=
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418 $elem.append($html);
825
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419 data.$htmlDiv = $html;
841
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420 // install event handler
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421 var $data = $(data);
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422 $data.bind('setup', handleSetup);
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423 $data.bind('update', handleUpdate);
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424 $data.bind('redisplay', handleRedisplay);
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425 $data.bind('dragZoom', handleDragZoom);
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diff changeset
426 var settings = data.settings;
843
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diff changeset
427 var selector = data.settings.regionContentSelector;
76c23870ac0b always show html-defined regions. wrong pos still not fixed
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diff changeset
428 settings.hasRegionContent = $elem.has(selector).length > 0;
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diff changeset
429 // neither URL-defined regions nor buttons when regions are predefined in HTML
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diff changeset
430 if (!settings.hasRegionContent) {
841
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diff changeset
431 var mode = settings.interactionMode;
816
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diff changeset
432 // add "rg" to digilibParamNames
841
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diff changeset
433 settings.digilibParamNames.push('rg');
816
36fbccbaf413 fixed automatic region links and region content
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diff changeset
434 // additional buttons
841
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diff changeset
435 var buttonSettings = settings.buttonSettings[mode];
816
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diff changeset
436 // configure buttons through digilib "regionSet" option
841
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diff changeset
437 var buttonSet = settings.regionSet || regionSet;
816
36fbccbaf413 fixed automatic region links and region content
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diff changeset
438 // set regionSet to [] or '' for no buttons (when showing regions only)
36fbccbaf413 fixed automatic region links and region content
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diff changeset
439 if (buttonSet.length && buttonSet.length > 0) {
844
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diff changeset
440 buttonSettings.regionSet = buttonSet;
816
36fbccbaf413 fixed automatic region links and region content
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diff changeset
441 buttonSettings.buttonSets.push('regionSet');
36fbccbaf413 fixed automatic region links and region content
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diff changeset
442 }
806
4f4f455ebbdb regions plugin works, inclunding event handlers
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diff changeset
443 }
785
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444 };
792
52c5595af03e started to adapt regions plugin to new plugin mechanism
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diff changeset
445
801
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hertzhaft
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diff changeset
446 // plugin object with name and install/init methods
792
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diff changeset
447 // shared objects filled by digilib on registration
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diff changeset
448 var pluginProperties = {
52c5595af03e started to adapt regions plugin to new plugin mechanism
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449 name : 'region',
52c5595af03e started to adapt regions plugin to new plugin mechanism
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diff changeset
450 install : install,
52c5595af03e started to adapt regions plugin to new plugin mechanism
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diff changeset
451 init : init,
52c5595af03e started to adapt regions plugin to new plugin mechanism
hertzhaft
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diff changeset
452 buttons : {},
52c5595af03e started to adapt regions plugin to new plugin mechanism
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diff changeset
453 actions : {},
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hertzhaft
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diff changeset
454 fn : {},
52c5595af03e started to adapt regions plugin to new plugin mechanism
hertzhaft
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diff changeset
455 plugins : {}
52c5595af03e started to adapt regions plugin to new plugin mechanism
hertzhaft
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diff changeset
456 };
52c5595af03e started to adapt regions plugin to new plugin mechanism
hertzhaft
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diff changeset
457
785
4091b0e4dfd7 first step to a regions plugin
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parents:
diff changeset
458 if ($.fn.digilib == null) {
801
2fb1f576375d stub for new plugins; overlay div for regions plugin
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diff changeset
459 $.error("jquery.digilib.regions must be loaded after jquery.digilib!");
785
4091b0e4dfd7 first step to a regions plugin
hertzhaft
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diff changeset
460 } else {
792
52c5595af03e started to adapt regions plugin to new plugin mechanism
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diff changeset
461 $.fn.digilib('plugin', pluginProperties);
785
4091b0e4dfd7 first step to a regions plugin
hertzhaft
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462 }
4091b0e4dfd7 first step to a regions plugin
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diff changeset
463 })(jQuery);