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