skins/photo_film_viewer.js

   1 /*
   2 * © 2008-2014 Benoît Pin – Centre de recherche en informatique – MINES ParisTech
   3 * http://plinn.org
   4 * Licence Creative Commons http://creativecommons.org/licenses/by-nc/2.0/
   5 *
   6 *
   7 */
   8
   9 var FilmSlider;
  10
  11 (function(){
  12
  13 var keyLeft = 37, keyRight = 39;
  14 var isTextMime = /^text\/.+/i;
  15 var isAddToSelection = /.*\/add_to_selection$/;
  16 var imgRequestedSize = /size=(\d+)/;
  17 var DEFAULT_IMAGE_SIZES = [500, 600, 800];
  18
  19 FilmSlider = function(filmBar, slider, ctxInfos, image, toolbar, breadcrumbs) {
  20         var thisSlider = this;
  21         this.filmBar = filmBar;
  22         var film = filmBar.firstChild;
  23         if (film.nodeType === 3) { film = film.nextSibling; }
  24         this.film = film;
  25         this.slider = slider;
  26         this.rail = slider.parentNode;
  27         this.sliderSpeedRatio = undefined;
  28         this.sliderRatio = undefined;
  29         this.selectedSlide = undefined;
  30         this.selectedSlideInSelection = undefined;
  31         this.cartSlide = document.getElementById('cart_slide');
  32         this.image = image;
  33         this.stretchable = image.parentNode;
  34         this.viewMode = 'medium';
  35
  36         this.buttons = [];
  37         this.toolbar = toolbar;
  38         if (breadcrumbs) {
  39                 var bcElements = breadcrumbs.getElementsByTagName('a');
  40                 this.lastBCElement = bcElements[bcElements.length-1];
  41                 var imgSrcParts = image.src.split('/');
  42                 this.lastBCElement.innerHTML = imgSrcParts[imgSrcParts.length-2];
  43                 this.hasBreadcrumbs = true;
  44         }
  45         else {
  46                 this.hasBreadcrumbs = false;
  47         }
  48
  49         var buttons = toolbar.getElementsByTagName('img');
  50         var b, name, i;
  51         for (i=0 ; i<buttons.length ; i++) {
  52                 b = buttons[i];
  53                 name = b.getAttribute('name');
  54                 if (name) { this.buttons[name] = b; }
  55         }
  56
  57         this.pendingImage = new Image();
  58         this.pendingImage.onload = function() {
  59                 thisSlider.refreshImage();
  60         };
  61         this.initialized = false;
  62
  63         this.film.style.left='0';
  64         this.film.style.top='0';
  65
  66         this.filmLength = ctxInfos.filmLength;
  67         this.center = ctxInfos.center;
  68         this.slideSize = ctxInfos.slideSize;
  69         this.ctxUrlTranslation = ctxInfos.ctxUrlTranslation;
  70
  71         this.ddHandlers = {'down' : function(evt){thisSlider.mouseDownHandler(evt);},
  72                                            'move' : function(evt){thisSlider.mouseMoveHandler(evt);},
  73                                            'up' :       function(evt){thisSlider.mouseUpHandler(evt);},
  74                                            'out' :      function(evt){thisSlider.mouseOutHandler(evt);}
  75                                           };
  76
  77         this.resizeSlider();
  78         this.addEventListeners();
  79 };
  80
  81
  82 FilmSlider.prototype.resizeSlider = function(evt) {
  83         var filmBarWidth = getObjectWidth(this.filmBar);
  84         if (!filmBarWidth) {
  85                 var thisSlider = this;
  86                 addListener(window, 'load', function(evt){thisSlider.resizeSlider(evt);});
  87                 return;
  88         }
  89
  90         var filmWidth = this.slideSize * this.filmLength;
  91         var sliderRatio = this.sliderRatio =  filmBarWidth / filmWidth;
  92         var sliderWidth = filmBarWidth * sliderRatio;
  93         this.rail.style.width = filmBarWidth + 'px';
  94         this.rail.style.display = 'block';
  95         this.rail.style.visibility = 'visible';
  96         if (sliderRatio < 1) {
  97                 this.slider.style.width = Math.round(sliderWidth) + 'px';
  98                 this.slider.style.visibility = 'visible';
  99         }
 100         else {
 101                 this.slider.style.visibility = 'hidden';
 102         }
 103
 104         this.winSize = {'width'  : getWindowWidth(),
 105                                         'height' : getWindowHeight()};
 106         this.maxRightPosition = filmBarWidth - sliderWidth;
 107         this.sliderSpeedRatio = - (filmBarWidth - sliderWidth) / (filmWidth - filmBarWidth);
 108         if (!this.initialized) {
 109                 this.centerSlide(this.center);
 110                 this.selectedSlide = this.filmBar.getElementsByTagName('img')[this.center].parentNode;
 111                 this.initialized = true;
 112         }
 113 };
 114
 115 FilmSlider.prototype.fitToScreen = function(evt) {
 116         this._fitToScreen();
 117         var thisSlider = this;
 118         addListener(window, 'resize', function(evt){thisSlider._fitToScreen();});
 119 };
 120
 121 FilmSlider.prototype._fitToScreen = function(evt) {
 122         var wh = getWindowHeight();
 123         var rb = getObjectTop(this.rail) + getObjectHeight(this.rail); // rail bottom
 124         var delta = wh - rb;
 125         var sh = getObjectHeight(this.stretchable);
 126         var newSize = sh + delta;
 127         this.stretchable.style.height = newSize + 'px';
 128
 129         var ratio = this.image.height / this.image.width;
 130         var bestFitSize = this.getBestFitSize(ratio);
 131         var currentSize = parseInt(imgRequestedSize.exec(this.image.src)[1], 10);
 132         if (currentSize !== bestFitSize) {
 133                 var src = this.image.src.replace(imgRequestedSize, 'size=' + bestFitSize);
 134                 this.pendingImage.src = src;
 135         }
 136 };
 137
 138 FilmSlider.prototype.getBestFitSize = function(ratio) {
 139         var fw = getObjectWidth(this.stretchable) - 1;
 140         var fh = getObjectHeight(this.stretchable) - 1;
 141
 142         var i, irw, irh;
 143         if (ratio < 1) {
 144                 for (i=DEFAULT_IMAGE_SIZES.length -1 ; i>0 ; i--) {
 145                         irw = DEFAULT_IMAGE_SIZES[i];
 146                         irh = irw * ratio;
 147                         if (irw <= fw && irh <= fh)
 148                                 break;
 149                 }
 150         }
 151         else {
 152                 for (i=DEFAULT_IMAGE_SIZES.length -1 ; i>0 ; i--) {
 153                         irh = DEFAULT_IMAGE_SIZES[i];
 154                         irw = irh / ratio;
 155                         if (irw <= fw && irh <= fh)
 156                                 break;
 157                 }
 158         }
 159         return DEFAULT_IMAGE_SIZES[i];
 160 };
 161
 162 FilmSlider.prototype.centerSlide = function(slideIndex) {
 163         if (this.sliderRatio > 1) { return; }
 164         var filmBarWidth = getObjectWidth(this.filmBar);
 165         var x = slideIndex * this.slideSize
 166         x = x - (filmBarWidth - this.slideSize) / 2.0;
 167         x = x * this.sliderSpeedRatio;
 168         var p = new Point( -x, 0 )
 169         this.setSliderPosition(p);
 170 };
 171
 172 FilmSlider.prototype.setSliderPosition = function(point) {
 173         if(point.x < 0) { point.x = 0; }
 174         if (point.x > this.maxRightPosition) { point.x = this.maxRightPosition; }
 175         this.slider.style.left = point.x + 'px';
 176         this.setFilmPosition(point);
 177 };
 178
 179 FilmSlider.prototype.setFilmPosition = function(point) {
 180         this.film.style.left = point.x / this.sliderSpeedRatio + 'px';
 181 };
 182
 183 FilmSlider.prototype.getSliderPosition = function() {
 184         var x = parseInt(this.slider.style.left);
 185         var y = parseInt(this.slider.style.top);
 186         var p = new Point(x, y);
 187         return p;
 188 };
 189
 190 FilmSlider.prototype.getFilmPosition = function() {
 191         var x = parseInt(this.film.style.left);
 192         var y = parseInt(this.film.style.top);
 193         var p = new Point(x, y);
 194         return p;
 195 };
 196
 197 FilmSlider.prototype.loadSibling = function(previous) {
 198         var slide = null;
 199         if (previous) {
 200                 slide = this.selectedSlide.parentNode.previousSibling;
 201                 if (slide && slide.nodeType===3) { slide = slide.previousSibling; }
 202         }
 203         else {
 204                 slide = this.selectedSlide.parentNode.nextSibling;
 205                 if (slide && slide.nodeType===3) { slide = slide.nextSibling; }
 206         }
 207
 208         if (!slide) { return; }
 209         else {
 210                 var target = slide.getElementsByTagName('a')[0];
 211                 raiseMouseEvent(target, 'click');
 212                 var index = parseInt(target.getAttribute('portfolio:position'));
 213                 this.centerSlide(index);
 214         }
 215 };
 216
 217 FilmSlider.prototype.addEventListeners = function() {
 218         var thisSlider = this;
 219         addListener(window, 'resize', function(evt){thisSlider.resizeSlider(evt);});
 220         addListener(this.filmBar, 'click', function(evt){thisSlider.thumbnailClickHandler(evt);});
 221         addListener(this.toolbar, 'click', function(evt){thisSlider.toolbarClickHandler(evt);});
 222         addListener(window, 'load', function(evt){thisSlider.fitToScreen(evt);});
 223
 224         // dd listeners
 225         addListener(this.slider, 'mousedown', this.ddHandlers['down']);
 226         if(browser.isDOM2Event){
 227                 if (browser.isAppleWebKit) {
 228                         this.filmBar.addEventListener('mousewheel', function(evt){thisSlider.mouseWheelHandler(evt);}, false);
 229                 }
 230                 else {
 231                         addListener(this.filmBar, 'DOMMouseScroll', function(evt){thisSlider.mouseWheelHandler(evt);});
 232                 }
 233         }
 234         else if (browser.isIE6up) {
 235                 addListener(this.filmBar, 'mousewheel', function(evt){thisSlider.mouseWheelHandler(evt);});
 236         }
 237
 238         addListener(document, 'keydown', function(evt){thisSlider.keyDownHandler(evt);});
 239         addListener(document, 'keypress', function(evt){thisSlider.keyPressHandler(evt);});
 240 };
 241
 242
 243 FilmSlider.prototype.mouseDownHandler = function(evt) {
 244         this.initialClickPoint = new Point(evt.clientX, evt.clientY);
 245         this.initialPosition = this.getSliderPosition();
 246         this.dragInProgress = true;
 247         addListener(document, 'mousemove', this.ddHandlers['move']);
 248         addListener(document, 'mouseup', this.ddHandlers['up']);
 249         addListener(document.body, 'mouseout', this.ddHandlers['out'])
 250
 251 };
 252
 253
 254 FilmSlider.prototype.mouseMoveHandler = function(evt) {
 255         if(!this.dragInProgress) { return; }
 256
 257         clearSelection();
 258         evt = getEventObject(evt);
 259         var currentPoint = new Point(evt.clientX, evt.clientY);
 260         var displacement = currentPoint.diff(this.initialClickPoint);
 261         this.setSliderPosition(this.initialPosition.add(displacement));
 262 };
 263
 264 FilmSlider.prototype.mouseUpHandler = function(evt) {
 265         this.dragInProgress = false;
 266         evt = getEventObject(evt);
 267         this.mouseMoveHandler(evt);
 268 };
 269
 270
 271 FilmSlider.prototype.mouseOutHandler = function(evt) {
 272         evt = getEventObject(evt);
 273         var x = evt.clientX;
 274         var y = evt.clientY;
 275         if (x < 0 ||
 276                 x > this.winSize['width'] ||
 277                 y < 0 ||
 278                 y > this.winSize['height']
 279                 ) {
 280                 this.mouseUpHandler(evt);
 281         }
 282 };
 283
 284 FilmSlider.prototype.thumbnailClickHandler = function(evt) {
 285         var target = getTargetedObject(evt);
 286         while (target.tagName !== 'A' && target !== this.filmBar)
 287                 target = target.parentNode;
 288         if (target.tagName !== 'A') { return; }
 289         else {
 290                 if (this.viewMode === 'full') {
 291                         this.mosaique.unload();
 292                         this.mosaique = null;
 293                         this.viewMode = 'medium';
 294                 }
 295                 disableDefault(evt);
 296                 disablePropagation(evt);
 297                 target.blur();
 298                 history.pushState(target.href, '', target.href);
 299
 300                 var imgBaseUrl = target.href;
 301                 var canonicalImgUrl;
 302                 if (this.ctxUrlTranslation[0]) {
 303                         canonicalImgUrl = imgBaseUrl.replace(this.ctxUrlTranslation[0],
 304                                                                                                  this.ctxUrlTranslation[1]);
 305                 }
 306                 else { canonicalImgUrl = imgBaseUrl; }
 307
 308                 var ajaxUrl = imgBaseUrl + '/photo_view_ajax';
 309                 var thisFS = this;
 310
 311                 //this.pendingImage.src = canonicalImgUrl + '/getResizedImage?size=600';
 312                 var thumbnail = target.getElementsByTagName('IMG')[0];
 313                 var bestFitSize = this.getBestFitSize(thumbnail.height/thumbnail.width);
 314                 this.pendingImage.src = canonicalImgUrl + '/getResizedImage?size=' + bestFitSize;
 315
 316                 // update buttons
 317                 var fullScreenLink = this.buttons['full_screen'].parentNode;
 318                 fullScreenLink.href = canonicalImgUrl + '/zoom_view';
 319
 320                 var toggleSelectionBtn = this.buttons['toggle_selection'];
 321                 var toggleSelectionLink = toggleSelectionBtn.parentNode;
 322                 this.selectedSlideInSelection = (target.className==='selected');
 323                 if (this.selectedSlideInSelection) {
 324                         toggleSelectionBtn.src = portal_url() + '/unselect_flag_btn.gif';
 325                         toggleSelectionBtn.alt = toggleSelectionLink.title = 'Retirer de la sélection';
 326                         toggleSelectionLink.href = canonicalImgUrl + '/remove_to_selection';
 327                 }
 328                 else {
 329                         toggleSelectionBtn.src = portal_url() + '/select_flag_btn.gif';
 330                         toggleSelectionBtn.alt = toggleSelectionLink.title = 'Ajouter à la sélection';
 331                         toggleSelectionLink.href = canonicalImgUrl + '/add_to_selection';
 332                 }
 333
 334                 var showBuyableButtonLink = this.buttons['show_buyable'].parentNode;
 335                 showBuyableButtonLink.href = canonicalImgUrl + '/get_slide_buyable_items';
 336                 this.cartSlide.innerHTML = '';
 337                 this.cartSlide.style.visibility='hidden';
 338
 339
 340                 var metadataButton = this.buttons['edit_metadata']
 341                 if (metadataButton) {
 342                         var metadataEditLink = metadataButton.parentNode;
 343                         metadataEditLink.href = canonicalImgUrl + '/photo_edit_form'
 344                 }
 345
 346
 347                 var req = new XMLHttpRequest();
 348                 req.onreadystatechange = function() {
 349                         switch (req.readyState) {
 350                                 case 1 :
 351                                         showProgressImage();
 352                                         break;
 353                                 case 2 :
 354                                         try {
 355                                                 if (! isTextMime.exec(req.getResponseHeader('Content-Type'))) {
 356                                                         req.onreadystatechange = null;
 357                                                         req.abort();
 358                                                         hideProgressImage();
 359                                                         window.location.href = thisFS._fallBackUrl;
 360                                                 }
 361                                         }
 362                                         catch(e){}
 363                                         break;
 364                                 case 4 :
 365                                         hideProgressImage();
 366                                         if (req.status === '200') { thisFS.populateViewer(req); }
 367                                         // else
 368                                         //      //window.location.href = target.href;
 369                                         //      console.error(ajaxUrl);
 370
 371                         };
 372                 };
 373
 374                 req.open("GET", ajaxUrl, true);
 375                 req.send(null);
 376
 377                 // update old displayed slide className
 378                 var className = this.selectedSlide.className;
 379                 var classes = className.split(' ');
 380                 var newClasses = [];
 381                 var name, i;
 382
 383                 for (i in classes) {
 384                         name = classes[i];
 385                         if (name === 'displayed') { continue; }
 386                         else { newClasses.push(name); }
 387                 }
 388
 389                 this.selectedSlide.className = newClasses.join(' ')
 390
 391                 // hightlight new displayed slide
 392                 this.selectedSlide = target;
 393                 className = this.selectedSlide.className;
 394                 classes = className.split(' ');
 395                 classes.push('displayed');
 396                 this.selectedSlide.className = classes.join(' ');
 397         }
 398 };
 399
 400 FilmSlider.prototype.toolbarClickHandler = function(evt) {
 401         var target = getTargetedObject(evt);
 402         if(target.tagName === 'IMG' && target.getAttribute('name')) {
 403                 switch(target.getAttribute('name')) {
 404                         case 'previous' :
 405                                 disableDefault(evt);
 406                                 disablePropagation(evt);
 407                                 var button = target;
 408                                 var link = button.parentNode;
 409                                 link.blur();
 410                                 this.loadSibling(true);
 411                                 break;
 412                         case 'next' :
 413                                 disableDefault(evt);
 414                                 disablePropagation(evt);
 415                                 var button = target;
 416                                 var link = button.parentNode;
 417                                 link.blur();
 418                                 this.loadSibling(false);
 419                                 break;
 420                         case 'full_screen':
 421                                 disableDefault(evt);
 422                                 disablePropagation(evt);
 423                                 target.parentNode.blur();
 424                                 if (this.viewMode === 'full') {
 425                                         this.mosaique.unload();
 426                                         this.mosaique = null;
 427                                         this.viewMode = 'medium';
 428                                         return;
 429                                 }
 430                                 var main = document.getElementById('photo_viewer');
 431                                 var url = target.parentNode.href;
 432                                 url = url.substring(0, url.length - '/zoom_view'.length);
 433                                 var margins = {'top':0, 'right':-1, 'bottom':0, 'left':0};
 434                                 this.mosaique = new Mosaique(main, url, margins);
 435                                 this.viewMode = 'full';
 436                                 break;
 437
 438                         case 'toggle_selection':
 439                                 disableDefault(evt);
 440                                 disablePropagation(evt);
 441                                 var button = target;
 442                                 var link = button.parentNode;
 443                                 link.blur();
 444
 445                                 var req = new XMLHttpRequest();
 446                                 var url = link.href;
 447                                 req.open("POST", url, true);
 448                                 req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
 449                                 req.send("ajax=1");
 450
 451                                 // toggle button
 452                                 var parts = url.split('/');
 453                                 var canonicalImgUrl = parts.slice(0, parts.length-1).join('/');
 454
 455                                 if (isAddToSelection.test(url)) {
 456                                         button.src = portal_url() + '/unselect_flag_btn.gif';
 457                                         button.alt = link.title = 'Retirer de la sélection';
 458                                         link.href = canonicalImgUrl + '/remove_to_selection';
 459                                         this.selectedSlide.className = 'selected displayed';
 460                                         this.image.parentNode.className = 'selected';
 461                                         this.selectedSlideInSelection = true;
 462                                 }
 463                                 else {
 464                                         button.src = portal_url() + '/select_flag_btn.gif';
 465                                         button.alt = link.title = 'Ajouter à la sélection';
 466                                         link.href = canonicalImgUrl + '/add_to_selection';
 467                                         this.selectedSlide.className = 'displayed';
 468                                         this.image.parentNode.className = '';
 469                                         this.selectedSlideInSelection = false;
 470                                 }
 471                                 break;
 472
 473                         case 'show_buyable':
 474                                 disableDefault(evt);
 475                                 disablePropagation(evt);
 476                                 var button = target;
 477                                 var link = button.parentNode;
 478                                 link.blur();
 479                                 var slide = this.cartSlide;
 480                                 slide.innerHTML = '';
 481                                 slide.style.visibility = 'visible';
 482                                 var cw = new CartWidget(slide, link.href);
 483                                 cw.onCancel = function() {
 484                                         CartWidget.prototype.onCancel.apply(this);
 485                                         slide.style.visibility = 'hidden';
 486                                 };
 487                                 cw.onAfterConfirm = function() {
 488                                         slide.style.visibility = 'hidden';
 489                                 };
 490                                 break;
 491
 492
 493
 494
 495                         /*
 496                         case 'edit_metadata' :
 497                                 disableDefault(evt);
 498                                 disablePropagation(evt);
 499                                 target.blur();
 500                                 if (this.viewMode === 'full') {
 501                                         this.mosaique.unload();
 502                                         this.mosaique = null;
 503                                         this.viewMode = 'medium';
 504                                         return;
 505                                 }
 506                                 var fi = new FragmentImporter(absolute_url());
 507                                 fi.useMacro('metadata_edit_form_macros', 'iptc', 'image_metadata');
 508                                 break;
 509                         */
 510                 }
 511         }
 512 };
 513
 514
 515 if(browser.isDOM2Event) {
 516         if (browser.isAppleWebKit) {
 517                 FilmSlider.prototype.mouseWheelHandler = function(evt) {
 518                         disableDefault(evt);
 519                         var pos = this.getSliderPosition();
 520                         pos.x -= evt.wheelDelta / 40;
 521                         this.setSliderPosition(pos);
 522                 };
 523         }
 524         else {
 525                 FilmSlider.prototype.mouseWheelHandler = function(evt) {
 526                         disableDefault(evt);
 527                         var pos = this.getSliderPosition();
 528                         pos.x += evt.detail * 3;
 529                         this.setSliderPosition(pos);
 530                 };
 531         }
 532 }
 533 else if (browser.isIE6up) {
 534         FilmSlider.prototype.mouseWheelHandler = function() {
 535                 var evt = window.event;
 536                 evt.returnValue = false;
 537                 var pos = this.getSliderPosition();
 538                 pos.x -= evt.wheelDelta / 40;
 539                 this.setSliderPosition(pos);
 540         };
 541 }
 542
 543 FilmSlider.prototype.keyDownHandler = function(evt) {
 544         var evt = getEventObject(evt);
 545         switch (evt.keyCode) {
 546                 case keyLeft :
 547                         this.loadSibling(true);
 548                         break;
 549                 case keyRight :
 550                         this.loadSibling(false);
 551                         break;
 552                 default:
 553                         return;
 554         }
 555 };
 556
 557
 558 FilmSlider.prototype.keyPressHandler = function(evt) {
 559         var target = getTargetedObject(evt);
 560         if (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA') { return; }
 561         var evt = getEventObject(evt);
 562         var charPress = String.fromCharCode((evt.keyCode) ? evt.keyCode : evt.which);
 563         switch(charPress) {
 564                 case 'f':
 565                 case 'F':
 566                         raiseMouseEvent(this.buttons['full_screen'], 'click');
 567                         break;
 568         }
 569 };
 570
 571 FilmSlider.prototype.populateViewer = function(req) {
 572         var elements = req.responseXML.documentElement.childNodes;
 573         for(var i=0 ; i < elements.length ; i++ ) {
 574                 element = elements[i];
 575                 switch (element.nodeName) {
 576                         case 'fragment' :
 577                                 var dest = document.getElementById(element.getAttribute('id'));
 578                                 if (dest) { dest.innerHTML = element.firstChild.nodeValue; }
 579                                 break;
 580                         case 'imageattributes' :
 581                                 var link = this.buttons['back_to_portfolio'].parentNode;
 582                                 link.href = element.getAttribute('backToContextUrl');
 583                                 link = this.buttons['show_buyable'].parentNode;
 584                                 var buyable = element.getAttribute('buyable');
 585                                 if(buyable === 'True') { link.className = null; }
 586                                 else if(buyable === 'False') { link.className = 'hidden'; }
 587                                 this.image.alt = element.getAttribute('alt');
 588                                 this.updateBreadcrumbs(element.getAttribute('lastBcUrl'),
 589                                                                            element.getAttribute('img_id'));
 590                                 break;
 591                 }
 592         }
 593 };
 594
 595 FilmSlider.prototype.refreshImage = function() {
 596         this.image.style.visibility = 'hidden';
 597         this.image.src = this.pendingImage.src;
 598         this.image.width = this.pendingImage.width;
 599         this.image.height = this.pendingImage.height;
 600         this.image.style.visibility = 'visible';
 601         if (this.selectedSlideInSelection) { this.image.parentNode.className = 'selected'; }
 602         else { this.image.parentNode.className = ''; }
 603 };
 604
 605 FilmSlider.prototype.updateBreadcrumbs = function(url, title) {
 606         if (this.hasBreadcrumbs) {
 607                 this.lastBCElement.href = element.getAttribute('lastBcUrl');
 608                 this.lastBCElement.innerHTML = element.getAttribute('img_id');
 609         }
 610 };
 611
 612 FilmSlider.prototype.startSlideShow = function() {
 613         this.slideShowSlide = this.pendingSlideShowSlide = this.selectedSlide;
 614         return this.slideShowSlide.href;
 615 };
 616
 617 FilmSlider.prototype.slideShowNext = function() {
 618         var nextSlide = this.slideShowSlide.parentNode.nextSibling;
 619         if (nextSlide && nextSlide.nodeType===3) { nextSlide = nextSlide.nextSibling; }
 620
 621         if (nextSlide) {
 622                 nextSlide = nextSlide.getElementsByTagName('a')[0];
 623                 this.pendingSlideShowSlide = nextSlide;
 624                 return this.pendingSlideShowSlide.href;
 625         }
 626         else {
 627                 var row = this.slideShowSlide.parentNode.parentNode;
 628                 var first = row.firstChild;
 629                 if (first.nodeType===3)
 630                         first = first.nextSibling;
 631                 this.pendingSlideShowSlide = first.getElementsByTagName('a')[0];
 632                 return this.pendingSlideShowSlide.href;
 633         }
 634 };
 635
 636 FilmSlider.prototype.slideShowPrevious = function() {
 637         var previousSlide = this.slideShowSlide.parentNode.previousSibling;
 638         if (previousSlide && previousSlide.nodeType===3) { previousSlide = previousSlide.previousSibling; }
 639
 640         if (previousSlide) {
 641                 previousSlide = previousSlide.getElementsByTagName('a')[0];
 642                 this.pendingSlideShowSlide = previousSlide;
 643                 return this.pendingSlideShowSlide.href;
 644         }
 645         else {
 646                 var row = this.slideShowSlide.parentNode.parentNode;
 647                 var last = row.lastChild;
 648                 if (last.nodeType===3) { last = last.previousSibling; }
 649                 this.pendingSlideShowSlide = last.getElementsByTagName('a')[0];
 650                 return this.pendingSlideShowSlide.href;
 651         }
 652 };
 653
 654 FilmSlider.prototype.slideShowImageLoaded = function() {
 655         this.slideShowSlide = this.pendingSlideShowSlide;
 656 };
 657
 658 FilmSlider.prototype.stopSlideShow = function() {
 659         raiseMouseEvent(this.slideShowSlide, 'click');
 660         var index = parseInt(this.selectedSlide.getAttribute('portfolio:position'));
 661         this.centerSlide(index);
 662 };
 663
 664
 665 /* UTILS */
 666 function Point(x, y) {
 667         this.x = Math.round(x);
 668         this.y = Math.round(y);
 669 }
 670 Point.prototype.diff = function(point) { return new Point(this.x - point.x, this.y - point.y); };
 671 Point.prototype.add = function(point) { return new Point(this.x + point.x, this.y + point.y); };
 672 Point.prototype.mul = function(k) { return new Point(this.x * k, this.y *k)};
 673 Point.prototype.toString = function() { return "(" + String(this.x) + ", " + String(this.y) + ")"; };
 674
 675 })();