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annotate client/digitallibrary/jquery/jquery.digilib.regions.js @ 815:60e8cca7ac81 jquery

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could not remove last region
author hertzhaft
date Mon, 21 Feb 2011 01:20:22 +0100
parents 1a7b14deae3a
children eff74cfaaf97
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 - 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 regioninfo : {
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44 onclick : "infoRegions",
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45 tooltip : "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 // buttonset of this plugin
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56 'regionSet' : ['addregion', 'delregion', 'regions', 'regioninfo', 'lessoptions'],
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57 // url param for regions
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58 'rg' : null,
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59 };
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60
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61 var actions = {
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62
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63 // define a region interactively with two clicked points
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64 "defineRegion" : function(data) {
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65 if (!data.settings.isRegionVisible) {
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66 alert("Please turn on regions visibility!");
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67 return;
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68 }
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69 var $elem = data.$elem;
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70 var $body = $('body');
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71 var bodyRect = geom.rectangle($body);
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72 var $scaler = data.$scaler;
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73 var scalerRect = geom.rectangle($scaler);
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74 var pt1, pt2;
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75 // overlay prevents other elements from reacting to mouse events
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76 var $overlay = $('<div class="digilib-overlay"/>');
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77 $body.append($overlay);
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78 bodyRect.adjustDiv($overlay);
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79 // we count regions from 1
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80 var $regionDiv = addRegionDiv(data, data.regions.length + 1);
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81
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82 // mousedown handler: start sizing
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83 var regionStart = function (evt) {
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84 pt1 = geom.position(evt);
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85 // setup and show zoom div
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86 pt1.adjustDiv($regionDiv);
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87 $regionDiv.width(0).height(0);
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88 $regionDiv.show();
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89 // register mouse events
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90 $overlay.bind("mousemove.dlRegion", regionMove);
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91 $overlay.bind("mouseup.dlRegion", regionEnd);
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92 return false;
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93 };
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94
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95 // mousemove handler: size region
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96 var regionMove = function (evt) {
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97 pt2 = geom.position(evt);
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98 var rect = geom.rectangle(pt1, pt2);
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99 rect.clipTo(scalerRect);
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100 // update region
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101 rect.adjustDiv($regionDiv);
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102 return false;
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103 };
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104
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105 // mouseup handler: end sizing
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106 var regionEnd = function (evt) {
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107 pt2 = geom.position(evt);
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108 // assume a click and continue if the area is too small
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109 var clickRect = geom.rectangle(pt1, pt2);
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110 if (clickRect.getArea() <= 5) return false;
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111 // unregister mouse events and get rid of overlay
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112 $overlay.unbind("mousemove.dlRegion", regionMove);
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113 $overlay.unbind("mouseup.dlRegion", regionEnd);
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114 $overlay.remove();
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115 // clip region
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116 clickRect.clipTo(scalerRect);
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117 clickRect.adjustDiv($regionDiv);
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118 storeRegion(data, $regionDiv);
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119 // fn.redisplay(data);
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120 fn.highlightButtons(data, 'addregion', 0);
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121 redisplay(data);
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122 return false;
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123 };
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124
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125 // bind start zoom handler
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126 $overlay.one('mousedown.dlRegion', regionStart);
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127 fn.highlightButtons(data, 'addregion', 1);
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128 },
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129
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130 // remove the last added region
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131 "removeRegion" : function (data) {
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132 if (!data.settings.isRegionVisible) {
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133 alert("Please turn on regions visibility!");
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134 return;
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135 }
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136 var region = data.regions.pop();
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137 if (region == null) return;
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138 var $regionDiv = region.$div;
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139 $regionDiv.remove();
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140 redisplay(data);
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141 },
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142
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143 // show/hide regions
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144 "toggleRegions" : function (data) {
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145 var show = !data.settings.isRegionVisible;
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146 data.settings.isRegionVisible = show;
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147 fn.highlightButtons(data, 'regions' , show);
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148 showRegionDivs(data);
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149 }
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150 };
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151
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152 var addRegion = actions.addRegion;
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153
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154 // store a region div
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155 var storeRegion = function (data, $regionDiv) {
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156 var regions = data.regions;
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157 var rect = geom.rectangle($regionDiv);
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158 var regionRect = data.imgTrafo.invtransform(rect);
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159 regionRect.$div = $regionDiv;
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160 regions.push(regionRect);
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161 console.debug("regions", data.regions, "regionRect", regionRect);
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162 };
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163
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164 // add a region to data.$elem
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165 var addRegionDiv = function (data, nr) {
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166 var $regionDiv = $('<div class="region overlay" style="display:none"/>');
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167 $regionDiv.attr("id", ID_PREFIX + nr);
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168 data.$elem.append($regionDiv);
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169 if (data.settings.showRegionNumbers) {
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170 var $regionNr = $('<div class="regionnumber" />');
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171 $regionNr.text(nr);
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172 $regionDiv.append($regionNr);
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173 }
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174 return $regionDiv;
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175 };
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176
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177 // create a region div from the data.regions collection
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178 var createRegionDiv = function (data, index) {
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179 var regions = data.regions;
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180 if (index > regions.length) return null;
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181 var region = regions[index];
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182 var $regionDiv = addRegionDiv(data, index + 1); // we count regions from 1
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183 region.$div = $regionDiv;
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184 // TODO store original coords in $regionDiv.data for embedded mode?
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185 return $regionDiv;
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186 };
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187
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188 // create regions
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189 var createRegionDivs = function (data) {
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190 for (var i = 0; i < data.regions.length ; i++) {
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191 createRegionDiv(data, i);
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192 }
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193 };
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194
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195 // show a region on top of the scaler image
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196 var showRegionDiv = function (data, index) {
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197 if (!data.imgTrafo) return;
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198 var $elem = data.$elem;
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199 var regions = data.regions;
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200 if (index > regions.length) return;
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201 var region = regions[index]
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202 var $regionDiv = region.$div;
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203 if (!$regionDiv) {
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204 console.debug("showRegionDiv: region has no $div", region);
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205 // alert("showRegionDiv: region has no $div to show");
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206 return;
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207 }
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208 var regionRect = region.copy();
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209 var show = data.settings.isRegionVisible;
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210 if (show && data.zoomArea.overlapsRect(regionRect)) {
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211 regionRect.clipTo(data.zoomArea);
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212 var screenRect = data.imgTrafo.transform(regionRect);
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213 screenRect.adjustDiv($regionDiv);
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214 $regionDiv.show();
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215 } else {
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216 $regionDiv.hide();
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217 }
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218 };
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219
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220 // show regions
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221 var showRegionDivs = function (data) {
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222 for (var i = 0; i < data.regions.length ; i++) {
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223 showRegionDiv(data, i);
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224 }
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225 };
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226
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227 var unpackRegions = function (data) {
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228 // create regions from parameters
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229 var rg = data.settings.rg;
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230 if (rg == null) return;
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231 var regions = data.regions;
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232 var rs = rg.split(",");
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233 for (var i = 0; i < rs.length; i++) {
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234 var r = rs[i];
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235 var pos = r.split("/", 4);
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236 var rect = geom.rectangle(pos[0], pos[1], pos[2], pos[3]);
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237 regions.push(rect);
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238 // TODO: backlink mechanism
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239 // var url = paramString.match(/http.*$/);
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240 }
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241 };
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242
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243 // pack regions array into a parameter string
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244 var packRegions = function (data) {
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245 var regions = data.regions;
815
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246 if (!regions.length) {
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247 data.settings.rg = null;
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248 return;
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249 }
813
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250 var rg = '';
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251 for (var i = 0; i < regions.length; i++) {
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252 region = regions[i];
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253 if (i) {
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254 rg += ',';
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255 }
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256 rg += [
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257 fn.cropFloatStr(region.x),
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258 fn.cropFloatStr(region.y),
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259 fn.cropFloatStr(region.width),
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260 fn.cropFloatStr(region.height)
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261 ].join('/');
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262 }
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263 data.settings.rg = rg;
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264 };
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265
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266 var redisplay = function (data) {
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267 packRegions(data);
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268 fn.redisplay(data);
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269 }
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270
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271 var handleSetup = function (evt) {
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272 data = this;
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273 console.debug("regions: handleSetup", data.settings.rg);
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274 unpackRegions(data);
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275 createRegionDivs(data);
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276 };
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277
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278 var handleUpdate = function (evt) {
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279 data = this;
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280 fn.highlightButtons(data, 'regions' , data.settings.isRegionVisible);
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281 showRegionDivs(data);
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282 console.debug("regions: handleUpdate", data.settings.rg);
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283 };
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284
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285 var handleRedisplay = function (evt) {
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286 data = this;
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287 showRegionDivs(data);
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288 console.debug("regions: handleRedisplay");
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289 };
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290
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291 var handleDragZoom = function (evt, zoomArea) {
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292 console.debug("regions: handleDragZoom, zoomArea:", zoomArea);
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293 data = this;
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294 };
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295
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296 // plugin installation called by digilib on plugin object.
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297 var install = function(plugin) {
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298 digilib = plugin;
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299 console.debug('installing regions plugin. digilib:', digilib);
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300 fn = digilib.fn;
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301 // import geometry classes
813
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302 geom = fn.geometry;
799
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303 FULL_AREA = geom.rectangle(0,0,1,1);
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304 // add defaults, actions, buttons
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305 $.extend(digilib.defaults, defaults);
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306 $.extend(digilib.actions, actions);
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307 $.extend(digilib.buttons, buttons);
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308 };
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309
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310 // plugin initialization
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311 var init = function (data) {
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312 console.debug('initialising regions plugin. data:', data);
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313 var $data = $(data);
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314 var buttonSettings = data.settings.buttonSettings.fullscreen;
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315 // configure buttons through digilib "regionSet" option
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316 var buttonSet = data.settings.regionSet || regionSet;
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317 // set regionSet to [] or '' for no buttons (when showing regions only)
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318 if (buttonSet.length && buttonSet.length > 0) {
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319 buttonSettings['regionSet'] = buttonSet;
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320 buttonSettings.buttonSets.push('regionSet');
813
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321 }
799
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322 // install event handler
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323 $data.bind('setup', handleSetup);
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324 $data.bind('update', handleUpdate);
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325 $data.bind('redisplay', handleRedisplay);
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326 $data.bind('dragZoom', handleDragZoom);
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327 // regions array
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328 data.regions = [];
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329 // add "rg" to digilibParamNames
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330 data.settings.digilibParamNames.push('rg');
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331 };
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332
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333 // plugin object with name and install/init methods
799
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334 // shared objects filled by digilib on registration
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335 var pluginProperties = {
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336 name : 'region',
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337 install : install,
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338 init : init,
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339 buttons : {},
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340 actions : {},
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341 fn : {},
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342 plugins : {}
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343 };
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344
792
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345 if ($.fn.digilib == null) {
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346 $.error("jquery.digilib.regions must be loaded after jquery.digilib!");
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347 } else {
799
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348 $.fn.digilib('plugin', pluginProperties);
792
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349 }
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350 })(jQuery);