Mercurial > hg > digilib
annotate client/digitallibrary/jquery/jquery.digilib.regions.js @ 825:f07b8ed13194 jquery
display regions as HTML for use in digilib element
author | hertzhaft |
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date | Tue, 01 Mar 2011 01:31:26 +0100 |
parents | 874d781dd7ec |
children | 7b3e5c666269 |
rev | line source |
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785 | 1 /** optional digilib regions plugin |
2 | |
3 markup a digilib image with rectangular regions | |
4 | |
5 TODO: | |
6 - store region in params/cookie, regarding zoom, mirror, rotation (like marks) | |
7 - set regions programmatically | |
8 - read regions from params/cookie and display | |
9 - backlink mechanism | |
10 - don't write to data.settings? | |
11 */ | |
12 | |
13 (function($) { | |
806 | 14 // the digilib object |
15 var digilib; | |
785 | 16 // the data object passed by digilib |
17 var data; | |
806 | 18 // the functions made available by digilib |
785 | 19 var fn; |
806 | 20 // affine geometry plugin |
785 | 21 var geom; |
22 | |
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23 var FULL_AREA; |
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24 |
806 | 25 var ID_PREFIX = "digilib-region-"; |
26 | |
785 | 27 var buttons = { |
28 addregion : { | |
806 | 29 onclick : "defineRegion", |
30 tooltip : "define a region", | |
785 | 31 icon : "addregion.png" |
32 }, | |
33 delregion : { | |
34 onclick : "removeRegion", | |
35 tooltip : "delete the last region", | |
36 icon : "delregion.png" | |
37 }, | |
38 regions : { | |
39 onclick : "toggleRegions", | |
40 tooltip : "show or hide regions", | |
41 icon : "regions.png" | |
42 }, | |
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43 regionhtml : { |
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44 onclick : "showRegionHTML", |
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45 tooltip : "show information about regions", |
785 | 46 icon : "regioninfo.png" |
47 } | |
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, |
806 | 53 // are region numbers shown? |
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, |
816 | 59 // turn any region into a clickable link to its detail view |
60 'autoRegionLinks' : false, | |
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'], |
806 | 65 // url param for regions |
66 'rg' : null, | |
67 }; | |
785 | 68 |
69 var actions = { | |
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70 |
785 | 71 // define a region interactively with two clicked points |
806 | 72 "defineRegion" : function(data) { |
73 if (!data.settings.isRegionVisible) { | |
74 alert("Please turn on regions visibility!"); | |
75 return; | |
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); |
785 | 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); |
816 | 87 var $regionDiv = addRegionDiv(data, data.regions.length); |
785 | 88 |
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89 // mousedown handler: start sizing |
785 | 90 var regionStart = function (evt) { |
91 pt1 = geom.position(evt); | |
92 // setup and show zoom div | |
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93 pt1.adjustDiv($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 $overlay.bind("mouseup.dlRegion", regionEnd); |
785 | 99 return false; |
100 }; | |
101 | |
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102 // mousemove handler: size region |
785 | 103 var regionMove = function (evt) { |
104 pt2 = geom.position(evt); | |
105 var rect = geom.rectangle(pt1, pt2); | |
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106 rect.clipTo(scalerRect); |
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107 // update region |
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108 rect.adjustDiv($regionDiv); |
785 | 109 return false; |
110 }; | |
111 | |
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112 // mouseup handler: end sizing |
785 | 113 var regionEnd = function (evt) { |
114 pt2 = geom.position(evt); | |
115 // assume a click and continue if the area is too small | |
116 var clickRect = geom.rectangle(pt1, pt2); | |
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); |
806 | 125 storeRegion(data, $regionDiv); |
785 | 126 // fn.redisplay(data); |
806 | 127 fn.highlightButtons(data, 'addregion', 0); |
128 redisplay(data); | |
785 | 129 return false; |
130 }; | |
131 | |
132 // bind start zoom handler | |
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133 $overlay.one('mousedown.dlRegion', regionStart); |
806 | 134 fn.highlightButtons(data, 'addregion', 1); |
785 | 135 }, |
136 | |
137 // remove the last added region | |
138 "removeRegion" : function (data) { | |
806 | 139 if (!data.settings.isRegionVisible) { |
140 alert("Please turn on regions visibility!"); | |
141 return; | |
142 } | |
143 var region = data.regions.pop(); | |
144 if (region == null) return; | |
145 var $regionDiv = region.$div; | |
785 | 146 $regionDiv.remove(); |
806 | 147 redisplay(data); |
785 | 148 }, |
149 | |
806 | 150 // show/hide regions |
151 "toggleRegions" : function (data) { | |
152 var show = !data.settings.isRegionVisible; | |
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(); |
785 | 179 } |
180 }; | |
181 | |
806 | 182 // store a region div |
183 var storeRegion = function (data, $regionDiv) { | |
184 var regions = data.regions; | |
185 var rect = geom.rectangle($regionDiv); | |
186 var regionRect = data.imgTrafo.invtransform(rect); | |
187 regionRect.$div = $regionDiv; | |
188 regions.push(regionRect); | |
189 console.debug("regions", data.regions, "regionRect", regionRect); | |
190 }; | |
191 | |
192 // add a region to data.$elem | |
816 | 193 var addRegionDiv = function (data, index) { |
194 var nr = index + 1; // we count regions from 1 | |
195 // create a digilib URL for this detail | |
196 var regionUrl = getRegionUrl(data, index); | |
806 | 197 var $regionDiv = $('<div class="region overlay" style="display:none"/>'); |
198 $regionDiv.attr("id", ID_PREFIX + nr); | |
199 data.$elem.append($regionDiv); | |
200 if (data.settings.showRegionNumbers) { | |
816 | 201 var $regionNr = $('<div class="regionnumber"/>'); |
202 var $regionLink = $('<a/>'); | |
203 $regionLink.attr('href', regionUrl); | |
204 $regionLink.text(nr); | |
205 $regionNr.append($regionLink); | |
806 | 206 $regionDiv.append($regionNr); |
207 } | |
816 | 208 if (data.settings.autoRegionLinks) { |
209 $regionDiv.bind('click.dlRegion', function() { | |
210 window.location = regionUrl; | |
211 }) | |
212 } | |
806 | 213 return $regionDiv; |
214 }; | |
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 |
806 | 222 // create a region div from the data.regions collection |
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223 var createRegionDiv = function (regions, index) { |
806 | 224 var region = regions[index]; |
816 | 225 var $regionDiv = addRegionDiv(data, index); |
806 | 226 region.$div = $regionDiv; |
227 return $regionDiv; | |
228 }; | |
229 | |
230 // create regions | |
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 }); |
785 | 236 }; |
237 | |
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238 // create regions from HTML |
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239 var createRegionsFromHTML = function (data) { |
816 | 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); |
816 | 244 $content.each(function(index, elem) { |
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); |
816 | 253 $div.show(); |
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254 }); |
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255 }; |
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256 |
806 | 257 // show a region on top of the scaler image |
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258 var showRegionDiv = function (data, index, anim) { |
806 | 259 if (!data.imgTrafo) return; |
260 var $elem = data.$elem; | |
785 | 261 var regions = data.regions; |
806 | 262 if (index > regions.length) return; |
263 var region = regions[index] | |
264 var $regionDiv = region.$div; | |
265 if (!$regionDiv) { | |
266 console.debug("showRegionDiv: region has no $div", region); | |
267 // alert("showRegionDiv: region has no $div to show"); | |
268 return; | |
269 } | |
270 var regionRect = region.copy(); | |
271 var show = data.settings.isRegionVisible; | |
272 if (show && data.zoomArea.overlapsRect(regionRect)) { | |
273 regionRect.clipTo(data.zoomArea); | |
274 var screenRect = data.imgTrafo.transform(regionRect); | |
275 screenRect.adjustDiv($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 } |
806 | 281 } else { |
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282 if (anim) { |
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283 $regionDiv.fadeOut(); |
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284 } else{ |
817 | 285 $regionDiv.hide(); |
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286 } |
806 | 287 } |
288 }; | |
289 | |
290 // show regions | |
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291 var showRegionDivs = function (data, anim) { |
806 | 292 for (var i = 0; i < data.regions.length ; i++) { |
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293 showRegionDiv(data, i, anim); |
806 | 294 } |
295 }; | |
296 | |
297 var unpackRegions = function (data) { | |
298 // create regions from parameters | |
299 var rg = data.settings.rg; | |
300 if (rg == null) return; | |
301 var regions = data.regions; | |
302 var rs = rg.split(","); | |
303 for (var i = 0; i < rs.length; i++) { | |
304 var r = rs[i]; | |
305 var pos = r.split("/", 4); | |
306 var rect = geom.rectangle(pos[0], pos[1], pos[2], pos[3]); | |
307 regions.push(rect); | |
785 | 308 } |
309 }; | |
310 | |
806 | 311 // pack regions array into a parameter string |
312 var packRegions = function (data) { | |
313 var regions = data.regions; | |
808 | 314 if (!regions.length) { |
315 data.settings.rg = null; | |
316 return; | |
317 } | |
806 | 318 var rg = ''; |
319 for (var i = 0; i < regions.length; i++) { | |
320 region = regions[i]; | |
321 if (i) { | |
322 rg += ','; | |
785 | 323 } |
806 | 324 rg += [ |
325 fn.cropFloatStr(region.x), | |
326 fn.cropFloatStr(region.y), | |
327 fn.cropFloatStr(region.width), | |
328 fn.cropFloatStr(region.height) | |
329 ].join('/'); | |
330 } | |
331 data.settings.rg = rg; | |
785 | 332 }; |
333 | |
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334 // reload display after a region has been added or removed |
806 | 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 } |
806 | 339 fn.redisplay(data); |
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340 }; |
806 | 341 |
816 | 342 // for turning region numbers/region divs into links to zoomed details |
343 var getRegionUrl = function (data, index) { | |
344 var region = data.regions[index]; | |
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345 var settings = data.settings; |
816 | 346 var params = { |
347 "fn" : settings.fn, | |
348 "pn" : settings.pn | |
349 }; | |
350 fn.packArea(params, region); | |
351 fn.packMarks(params, data.marks); | |
352 fn.packScalerFlags(params, data.scalerFlags); | |
353 var paramNames = digilib.defaults.digilibParamNames; | |
354 // build our own digilib URL without storing anything | |
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; |
806 | 362 console.debug("regions: handleSetup", data.settings.rg); |
816 | 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); |
816 | 366 // regions are defined in the URL |
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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; |
806 | 377 fn.highlightButtons(data, 'regions' , data.settings.isRegionVisible); |
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378 fn.highlightButtons(data, 'regionhtml' , data.settings.showRegionHTML); |
806 | 379 showRegionDivs(data); |
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) { |
806 | 385 data = this; |
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. |
806 | 397 var install = function(plugin) { |
398 digilib = plugin; | |
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399 console.debug('installing regions plugin. digilib:', digilib); |
806 | 400 fn = digilib.fn; |
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401 // import geometry classes |
806 | 402 geom = fn.geometry; |
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403 FULL_AREA = geom.rectangle(0,0,1,1); |
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404 // add defaults, actions, buttons |
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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); |
816 | 414 // regions array |
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); |
816 | 420 // no URL-defined regions, no buttons when regions are predefined in HTML |
421 if (!data.settings.includeRegionContent) { | |
422 // add "rg" to digilibParamNames | |
423 data.settings.digilibParamNames.push('rg'); | |
424 // additional buttons | |
425 var buttonSettings = data.settings.buttonSettings.fullscreen; | |
426 // configure buttons through digilib "regionSet" option | |
427 var buttonSet = data.settings.regionSet || regionSet; | |
428 // set regionSet to [] or '' for no buttons (when showing regions only) | |
429 if (buttonSet.length && buttonSet.length > 0) { | |
430 buttonSettings['regionSet'] = buttonSet; | |
431 buttonSettings.buttonSets.push('regionSet'); | |
432 } | |
806 | 433 } |
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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 $data.bind('dragZoom', handleDragZoom); |
785 | 439 }; |
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440 |
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441 // plugin object with name and install/init methods |
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442 // shared objects filled by digilib on registration |
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443 var pluginProperties = { |
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444 name : 'region', |
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445 install : install, |
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446 init : init, |
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447 buttons : {}, |
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448 actions : {}, |
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449 fn : {}, |
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450 plugins : {} |
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451 }; |
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452 |
785 | 453 if ($.fn.digilib == null) { |
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454 $.error("jquery.digilib.regions must be loaded after jquery.digilib!"); |
785 | 455 } else { |
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456 $.fn.digilib('plugin', pluginProperties); |
785 | 457 } |
458 })(jQuery); |