skins/photo_film_viewer.js

   1 /*
   2 * © 2008 Benoît Pin – Centre de recherche en informatique – École des mines de Paris
   3 * http://plinn.org
   4 * Licence Creative Commons http://creativecommons.org/licenses/by-nc/2.0/
   5 * $Id: photo_film_viewer.js 1303 2009-08-21 22:19:05Z pin $
   6 * $URL: http://svn.luxia.fr/svn/labo/projects/zope/Portfolio/trunk/skins/photo_film_viewer.js $
   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)
  24                 film = film.nextSibling;
  25         this.film = film;
  26         this.slider = slider;
  27         this.rail = slider.parentNode;
  28         this.sliderSpeedRatio = undefined;
  29         this.sliderRatio = undefined;
  30         this.selectedSlide = undefined;
  31         this.selectedSlideInSelection = undefined;
  32         this.cartSlide = document.getElementById('cart_slide');
  33         this.image = image;
  34         this.stretchable = image.parentNode;
  35         this.viewMode = 'medium';
  36
  37         this.buttons = new Array();
  38         this.toolbar = toolbar;
  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
  44         var buttons = toolbar.getElementsByTagName('img');
  45         var b, name;
  46         for (var i=0 ; i<buttons.length ; i++) {
  47                 b = buttons[i];
  48                 name = b.getAttribute('name');
  49                 if (name)
  50                         this.buttons[name] = b;
  51         }
  52
  53         this.pendingImage = new Image();
  54         this.pendingImage.onload = function() {
  55                 thisSlider.refreshImage();
  56         };
  57         this.initialized = false;
  58
  59         with(this.slider.style) {
  60                 left='0';
  61                 top='0';
  62         }
  63         with(this.film.style) {
  64                 left='0';
  65                 top='0';
  66         }
  67
  68         this.filmLength = ctxInfos.filmLength;
  69         this.center = ctxInfos.center;
  70         this.slideSize = ctxInfos.slideSize;
  71         this.ctxUrlTranslation = ctxInfos.ctxUrlTranslation;
  72
  73         this.ddHandlers = {'down' : function(evt){thisSlider.mouseDownHandler(evt);},
  74                                            'move' : function(evt){thisSlider.mouseMoveHandler(evt);},
  75                                            'up' :   function(evt){thisSlider.mouseUpHandler(evt);},
  76                                            'out' :  function(evt){thisSlider.mouseOutHandler(evt);}
  77                                           };
  78
  79         this.resizeSlider();
  80         this.addEventListeners()
  81 };
  82
  83
  84 FilmSlider.prototype.resizeSlider = function(evt) {
  85         var filmBarWidth = getObjectWidth(this.filmBar);
  86         if (!filmBarWidth){
  87                 var thisSlider = this;
  88                 addListener(window, 'load', function(evt){thisSlider.resizeSlider(evt);});
  89                 return;
  90         }
  91
  92         var filmWidth = this.slideSize * this.filmLength;
  93         var sliderRatio = this.sliderRatio =  filmBarWidth / filmWidth;
  94         var sliderWidth = filmBarWidth * sliderRatio;
  95         if (sliderRatio < 1) {
  96                 this.rail.style.width = filmBarWidth + 'px';
  97                 this.slider.style.width = Math.round(sliderWidth) + 'px';
  98                 this.rail.style.display = 'block';
  99                 this.rail.style.visibility = 'visible';
 100         }
 101         else {
 102                 this.rail.style.display = 'none';
 103                 this.rail.style.visibility = 'hidden';
 104         }
 105
 106         this.winSize = {'width'  : getWindowWidth(),
 107                                         'height' : getWindowHeight()};
 108         this.maxRightPosition = filmBarWidth - sliderWidth
 109         this.sliderSpeedRatio = - (filmBarWidth - sliderWidth) / (filmWidth - filmBarWidth);
 110         if (!this.initialized) {
 111                 this.centerSlide(this.center);
 112                 this.selectedSlide = this.filmBar.getElementsByTagName('img')[this.center].parentNode;
 113                 this.initialized = true;
 114         }
 115 };
 116
 117 FilmSlider.prototype.fitToScreen = function(evt) {
 118         this._fitToScreen();
 119         var thisSlider = this;
 120         addListener(window, 'resize', function(evt){thisSlider._fitToScreen();});
 121 };
 122
 123 FilmSlider.prototype._fitToScreen = function(evt) {
 124         var wh = getWindowHeight();
 125         var ch = document.body.clientHeight;
 126         var sh = getObjectHeight(this.stretchable);
 127         var newSize = sh + wh - ch;
 128         this.stretchable.style.height = newSize + 'px';
 129
 130         var ratio = this.image.height / this.image.width;
 131         var bestFitSize = this.getBestFitSize(ratio);
 132         var currentSize = parseInt(imgRequestedSize.exec(this.image.src)[1]);
 133         if (currentSize != bestFitSize) {
 134                 var src = this.image.src.replace(imgRequestedSize, 'size=' + bestFitSize);
 135                 this.pendingImage.src = src;
 136         }
 137 };
 138
 139 FilmSlider.prototype.getBestFitSize = function(ratio) {
 140         var fw = getObjectWidth(this.stretchable) - 1;
 141         var fh = getObjectHeight(this.stretchable) - 1;
 142
 143         var i, irw, irh;
 144         if (ratio < 1) {
 145                 for (i=DEFAULT_IMAGE_SIZES.length -1 ; i>0 ; i--) {
 146                         irw = DEFAULT_IMAGE_SIZES[i];
 147                         irh = irw * ratio;
 148                         if (irw <= fw && irh <= fh)
 149                                 break;
 150                 }
 151         }
 152         else {
 153                 for (i=DEFAULT_IMAGE_SIZES.length -1 ; i>0 ; i--) {
 154                         irh = DEFAULT_IMAGE_SIZES[i];
 155                         irw = irh / ratio;
 156                         if (irw <= fw && irh <= fh)
 157                                 break;
 158                 }
 159         }
 160         return DEFAULT_IMAGE_SIZES[i];
 161 };
 162
 163 FilmSlider.prototype.centerSlide = function(slideIndex) {
 164         if (this.sliderRatio > 1)
 165                 return;
 166         var filmBarWidth = getObjectWidth(this.filmBar);
 167         var x = slideIndex * this.slideSize
 168         x = x - (filmBarWidth - this.slideSize) / 2.0;
 169         x = x * this.sliderSpeedRatio;
 170         var p = new Point( -x, 0 )
 171         this.setSliderPosition(p);
 172 };
 173
 174 FilmSlider.prototype.setSliderPosition = function(point) {
 175         if(point.x < 0)
 176                 point.x = 0;
 177         if (point.x > this.maxRightPosition)
 178                 point.x = this.maxRightPosition;
 179         this.slider.style.left = point.x + 'px';
 180         this.setFilmPosition(point);
 181 };
 182
 183 FilmSlider.prototype.setFilmPosition = function(point) {
 184         this.film.style.left = point.x / this.sliderSpeedRatio + 'px';
 185 };
 186
 187 FilmSlider.prototype.getSliderPosition = function() {
 188         var x = parseInt(this.slider.style.left);
 189         var y = parseInt(this.slider.style.top);
 190         var p = new Point(x, y);
 191         return p;
 192 };
 193
 194 FilmSlider.prototype.getFilmPosition = function() {
 195         var x = parseInt(this.film.style.left);
 196         var y = parseInt(this.film.style.top);
 197         var p = new Point(x, y);
 198         return p;
 199 };
 200
 201 FilmSlider.prototype.loadSibling = function(previous) {
 202         var slide = null;
 203         if (previous) {
 204                 slide = this.selectedSlide.parentNode.previousSibling;
 205                 if (slide && slide.nodeType==3)
 206                         slide = slide.previousSibling;
 207         }
 208         else {
 209                 slide = this.selectedSlide.parentNode.nextSibling;
 210                 if (slide && slide.nodeType==3)
 211                         slide = slide.nextSibling;
 212         }
 213
 214         if (!slide)
 215                 return;
 216         else {
 217                 var target = slide.getElementsByTagName('a')[0];
 218                 raiseMouseEvent(target, 'click');
 219                 var index = parseInt(target.getAttribute('portfolio:position'));
 220                 this.centerSlide(index);
 221         }
 222 };
 223
 224 FilmSlider.prototype.addEventListeners = function() {
 225         var thisSlider = this;
 226         addListener(window, 'resize', function(evt){thisSlider.resizeSlider(evt);});
 227         addListener(this.filmBar, 'click', function(evt){thisSlider.thumbnailClickHandler(evt);});
 228         addListener(this.toolbar, 'click', function(evt){thisSlider.toolbarClickHandler(evt);});
 229         addListener(window, 'load', function(evt){thisSlider.fitToScreen(evt);});
 230
 231         // dd listeners
 232         addListener(this.slider, 'mousedown', this.ddHandlers['down']);
 233         if(browser.isDOM2Event){
 234                 if (browser.isAppleWebKit) {
 235                         this.filmBar.addEventListener('mousewheel', function(evt){thisSlider.mouseWheelHandler(evt);}, false);
 236                 }
 237                 else {
 238                         addListener(this.filmBar, 'DOMMouseScroll', function(evt){thisSlider.mouseWheelHandler(evt);});
 239                 }
 240         }
 241         else if (browser.isIE6up) {
 242                 addListener(this.filmBar, 'mousewheel', function(evt){thisSlider.mouseWheelHandler(evt);});
 243         }
 244
 245         addListener(document, 'keydown', function(evt){thisSlider.keyDownHandler(evt);});
 246         addListener(document, 'keypress', function(evt){thisSlider.keyPressHandler(evt);});
 247 };
 248
 249
 250 FilmSlider.prototype.mouseDownHandler = function(evt) {
 251         this.initialClickPoint = new Point(evt.clientX, evt.clientY);
 252         this.initialPosition = this.getSliderPosition();
 253         this.dragInProgress = true;
 254         addListener(document, 'mousemove', this.ddHandlers['move']);
 255         addListener(document, 'mouseup', this.ddHandlers['up']);
 256         addListener(document.body, 'mouseout', this.ddHandlers['out'])
 257
 258 };
 259
 260
 261 FilmSlider.prototype.mouseMoveHandler = function(evt) {
 262         if(!this.dragInProgress)
 263                 return;
 264
 265         clearSelection();
 266         evt = getEventObject(evt);
 267         var currentPoint = new Point(evt.clientX, evt.clientY);
 268         var displacement = currentPoint.diff(this.initialClickPoint);
 269         this.setSliderPosition(this.initialPosition.add(displacement));
 270 };
 271
 272 FilmSlider.prototype.mouseUpHandler = function(evt) {
 273         this.dragInProgress = false;
 274         evt = getEventObject(evt);
 275         this.mouseMoveHandler(evt);
 276 };
 277
 278
 279 FilmSlider.prototype.mouseOutHandler = function(evt) {
 280         evt = getEventObject(evt);
 281         var x = evt.clientX;
 282         var y = evt.clientY;
 283         if (x < 0 ||
 284                 x > this.winSize['width'] ||
 285                 y < 0 ||
 286                 y > this.winSize['height']
 287                 ){
 288                 this.mouseUpHandler(evt);
 289         }
 290 };
 291
 292 FilmSlider.prototype.thumbnailClickHandler = function(evt) {
 293         var target = getTargetedObject(evt);
 294         while (target.tagName != 'A' && target != this.filmBar)
 295                 target = target.parentNode;
 296         if (target.tagName != 'A')
 297                 return;
 298         else {
 299                 if (this.viewMode == 'full') {
 300                         this.mosaique.unload();
 301                         this.mosaique = null;
 302                         this.viewMode = 'medium';
 303                 }
 304                 disableDefault(evt);
 305                 disablePropagation(evt);
 306                 target.blur();
 307
 308                 var imgBaseUrl = target.href;
 309                 var canonicalImgUrl;
 310                 if (this.ctxUrlTranslation[0])
 311                         canonicalImgUrl = imgBaseUrl.replace(this.ctxUrlTranslation[0],
 312                                                                                                  this.ctxUrlTranslation[1]);
 313                 else
 314                         canonicalImgUrl = imgBaseUrl;
 315
 316                 var ajaxUrl = imgBaseUrl + '/photo_view_ajax';
 317                 var thisFS = this;
 318
 319                 //this.pendingImage.src = canonicalImgUrl + '/getResizedImage?size=600';
 320                 var thumbnail = target.getElementsByTagName('IMG')[0];
 321                 var bestFitSize = this.getBestFitSize(thumbnail.height/thumbnail.width);
 322                 this.pendingImage.src = canonicalImgUrl + '/getResizedImage?size=' + bestFitSize;
 323
 324                 // update buttons
 325                 var fullScreenLink = this.buttons['full_screen'].parentNode;
 326                 fullScreenLink.href = canonicalImgUrl + '/zoom_view';
 327
 328                 var toggleSelectionBtn = this.buttons['toggle_selection'];
 329                 var toggleSelectionLink = toggleSelectionBtn.parentNode;
 330                 this.selectedSlideInSelection = (target.className=='selected');
 331                 if (this.selectedSlideInSelection) {
 332                         toggleSelectionBtn.src = portal_url() + '/unselect_flag_btn.gif';
 333                         toggleSelectionBtn.alt = toggleSelectionLink.title = 'Retirer de la sélection';
 334                         toggleSelectionLink.href = canonicalImgUrl + '/remove_to_selection';
 335                 }
 336                 else {
 337                         toggleSelectionBtn.src = portal_url() + '/select_flag_btn.gif';
 338                         toggleSelectionBtn.alt = toggleSelectionLink.title = 'Ajouter à la sélection';
 339                         toggleSelectionLink.href = canonicalImgUrl + '/add_to_selection';
 340                 }
 341
 342                 var showBuyableButtonLink = this.buttons['show_buyable'].parentNode;
 343                 showBuyableButtonLink.href = canonicalImgUrl + '/get_slide_buyable_items';
 344                 this.cartSlide.innerHTML = '';
 345                 this.cartSlide.style.visibility='hidden';
 346
 347
 348                 var metadataButton = this.buttons['edit_metadata']
 349                 if (metadataButton) {
 350                         var metadataEditLink = metadataButton.parentNode;
 351                         metadataEditLink.href = canonicalImgUrl + '/photo_edit_form'
 352                 }
 353
 354
 355                 var req = new XMLHttpRequest();
 356                 req.onreadystatechange = function() {
 357                         switch (req.readyState) {
 358                                 case 1 :
 359                                         showProgressImage();
 360                                         break;
 361                                 case 2 :
 362                                         try {
 363                                                 if (! isTextMime.exec(req.getResponseHeader('Content-Type'))) {
 364                                                         req.onreadystatechange = null;
 365                                                         req.abort();
 366                                                         hideProgressImage();
 367                                                         window.location.href = thisFS._fallBackUrl;
 368                                                 }
 369                                         }
 370                                         catch(e){}
 371                                         break;
 372                                 case 4 :
 373                                         hideProgressImage();
 374                                         if (req.status == '200')
 375                                                 thisFS.populateViewer(req);
 376                                         else
 377                                                 //window.location.href = target.href;
 378                                                 console.error(ajaxUrl);
 379
 380                         };
 381                 };
 382
 383                 req.open("GET", ajaxUrl, true);
 384                 req.send(null);
 385
 386                 // update old displayed slide className
 387                 var className = this.selectedSlide.className;
 388                 var classes = className.split(' ');
 389                 var newClasses = new Array();
 390                 var name;
 391
 392                 for (i in classes) {
 393                         name = classes[i];
 394                         if (name == 'displayed')
 395                                 continue;
 396                         else
 397                                 newClasses.push(name);
 398                 }
 399
 400                 this.selectedSlide.className = newClasses.join(' ')
 401
 402                 // hightlight new displayed slide
 403                 this.selectedSlide = target;
 404                 className = this.selectedSlide.className;
 405                 classes = className.split(' ');
 406                 classes.push('displayed');
 407                 this.selectedSlide.className = classes.join(' ');
 408         }
 409 };
 410
 411 FilmSlider.prototype.toolbarClickHandler = function(evt) {
 412         var target = getTargetedObject(evt);
 413         if(target.tagName == 'IMG' && target.getAttribute('name')){
 414                 switch(target.getAttribute('name')) {
 415                         case 'previous' :
 416                                 disableDefault(evt);
 417                                 disablePropagation(evt);
 418                                 var button = target;
 419                                 var link = button.parentNode;
 420                                 link.blur();
 421                                 this.loadSibling(true);
 422                                 break;
 423                         case 'next' :
 424                                 disableDefault(evt);
 425                                 disablePropagation(evt);
 426                                 var button = target;
 427                                 var link = button.parentNode;
 428                                 link.blur();
 429                                 this.loadSibling(false);
 430                                 break;
 431                         case 'full_screen':
 432                                 disableDefault(evt);
 433                                 disablePropagation(evt);
 434                                 target.parentNode.blur();
 435                                 if (this.viewMode == 'full') {
 436                                         this.mosaique.unload();
 437                                         this.mosaique = null;
 438                                         this.viewMode = 'medium';
 439                                         return;
 440                                 }
 441                                 var main = document.getElementById('photo_viewer');
 442                                 var url = target.parentNode.href;
 443                                 url = url.substring(0, url.length - '/zoom_view'.length);
 444                                 var margins = {'top':0, 'right':-1, 'bottom':0, 'left':0};
 445                                 this.mosaique = new Mosaique(main, url, margins);
 446                                 this.viewMode = 'full';
 447                                 break;
 448
 449                         case 'toggle_selection':
 450                                 disableDefault(evt);
 451                                 disablePropagation(evt);
 452                                 var button = target;
 453                                 var link = button.parentNode;
 454                                 link.blur();
 455
 456                                 var req = new XMLHttpRequest();
 457                                 var url = link.href;
 458                                 req.open("POST", url, true);
 459                                 req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
 460                                 req.send("ajax=1");
 461
 462                                 // toggle button
 463                                 var parts = url.split('/');
 464                                 var canonicalImgUrl = parts.slice(0, parts.length-1).join('/');
 465
 466                                 if (isAddToSelection.test(url)) {
 467                                         button.src = portal_url() + '/unselect_flag_btn.gif';
 468                                         button.alt = link.title = 'Retirer de la sélection';
 469                                         link.href = canonicalImgUrl + '/remove_to_selection';
 470                                         this.selectedSlide.className = 'selected displayed';
 471                                         this.image.parentNode.className = 'selected';
 472                                         this.selectedSlideInSelection = true;
 473                                 }
 474                                 else {
 475                                         button.src = portal_url() + '/select_flag_btn.gif';
 476                                         button.alt = link.title = 'Ajouter à la sélection';
 477                                         link.href = canonicalImgUrl + '/add_to_selection';
 478                                         this.selectedSlide.className = 'displayed';
 479                                         this.image.parentNode.className = '';
 480                                         this.selectedSlideInSelection = false;
 481                                 }
 482                                 break;
 483
 484                         case 'show_buyable':
 485                                 disableDefault(evt);
 486                                 disablePropagation(evt);
 487                                 var button = target;
 488                                 var link = button.parentNode;
 489                                 link.blur();
 490                                 var slide = this.cartSlide;
 491                                 slide.innerHTML = '';
 492                                 slide.style.visibility = 'visible';
 493                                 var cw = new CartWidget(slide, link.href);
 494                                 cw.onCancel = function() {
 495                                         CartWidget.prototype.onCancel.apply(this);
 496                                         slide.style.visibility = 'hidden';
 497                                 };
 498                                 cw.onAfterConfirm = function() {
 499                                         slide.style.visibility = 'hidden';
 500                                 };
 501                                 break;
 502
 503
 504
 505
 506                         /*
 507                         case 'edit_metadata' :
 508                                 disableDefault(evt);
 509                                 disablePropagation(evt);
 510                                 target.blur();
 511                                 if (this.viewMode == 'full') {
 512                                         this.mosaique.unload();
 513                                         this.mosaique = null;
 514                                         this.viewMode = 'medium';
 515                                         return;
 516                                 }
 517                                 var fi = new FragmentImporter(absolute_url());
 518                                 fi.useMacro('metadata_edit_form_macros', 'iptc', 'image_metadata');
 519                                 break;
 520                         */
 521                 }
 522         }
 523 };
 524
 525
 526 if(browser.isDOM2Event){
 527         if (browser.isAppleWebKit) {
 528                 FilmSlider.prototype.mouseWheelHandler = function(evt) {
 529                         disableDefault(evt);
 530                         var pos = this.getSliderPosition();
 531                         pos.x -= evt.wheelDelta / 40;
 532                         this.setSliderPosition(pos);
 533                 };
 534         }
 535         else {
 536                 FilmSlider.prototype.mouseWheelHandler = function(evt) {
 537                         disableDefault(evt);
 538                         var pos = this.getSliderPosition();
 539                         pos.x += evt.detail * 3;
 540                         this.setSliderPosition(pos);
 541                 };
 542         }
 543 }
 544 else if (browser.isIE6up) {
 545         FilmSlider.prototype.mouseWheelHandler = function() {
 546                 var evt = window.event;
 547                 evt.returnValue = false;
 548                 var pos = this.getSliderPosition();
 549                 pos.x -= evt.wheelDelta / 40;
 550                 this.setSliderPosition(pos);
 551         };
 552 }
 553
 554 FilmSlider.prototype.keyDownHandler = function(evt) {
 555         var evt = getEventObject(evt);
 556         switch (evt.keyCode) {
 557                 case keyLeft :
 558                         this.loadSibling(true);
 559                         break;
 560                 case keyRight :
 561                         this.loadSibling(false);
 562                         break;
 563                 default:
 564                         return;
 565         }
 566 };
 567
 568
 569 FilmSlider.prototype.keyPressHandler = function(evt) {
 570         var target = getTargetedObject(evt);
 571         if (target.tagName == 'INPUT' || target.tagName== 'TEXTAREA')
 572                 return;
 573         var evt = evt = getEventObject(evt);
 574         evt = getEventObject(evt);
 575         var charPress = String.fromCharCode((evt.keyCode) ? evt.keyCode : evt.which);
 576         switch(charPress) {
 577                 case 'f':
 578                 case 'F':
 579                         raiseMouseEvent(this.buttons['full_screen'], 'click');
 580                         break;
 581         }
 582 };
 583
 584 FilmSlider.prototype.populateViewer = function(req) {
 585         var elements = req.responseXML.documentElement.childNodes;
 586         for(var i=0 ; i < elements.length ; i++ ) {
 587                 element = elements[i];
 588                 switch (element.nodeName) {
 589                         case 'fragment' :
 590                                 var dest = document.getElementById(element.getAttribute('id'));
 591                                 dest.innerHTML = element.firstChild.nodeValue;
 592                                 break;
 593                         case 'imageattributes' :
 594                                 var link = this.buttons['back_to_portfolio'].parentNode;
 595                                 link.href = element.getAttribute('backToContextUrl');
 596                                 link = this.buttons['show_buyable'].parentNode;
 597                                 var buyable = element.getAttribute('buyable');
 598                                 if(buyable == 'True')
 599                                         link.className = null;
 600                                 else if(buyable == 'False')
 601                                         link.className = 'hidden';
 602                                 this.image.alt = element.getAttribute('alt');
 603                                 this.lastBCElement.href = element.getAttribute('lastBcUrl');
 604                                 this.lastBCElement.innerHTML = element.getAttribute('img_id');
 605                                 break;
 606                 }
 607         }
 608 };
 609
 610 FilmSlider.prototype.refreshImage = function() {
 611         this.image.style.visibility = 'hidden';
 612         this.image.src = this.pendingImage.src;
 613         this.image.width = this.pendingImage.width;
 614         this.image.height = this.pendingImage.height;
 615         this.image.style.visibility = 'visible';
 616         if (this.selectedSlideInSelection)
 617                 this.image.parentNode.className = 'selected';
 618         else
 619                 this.image.parentNode.className = '';
 620 };
 621
 622 FilmSlider.prototype.startSlideShow = function() {
 623         this.slideShowSlide = this.selectedSlide;
 624         this.nextSlideShowSlide = this.selectedSlide;
 625         return this.slideShowSlide.href;
 626 };
 627
 628 FilmSlider.prototype.slideShowNext = function() {
 629         this.slideShowSlide = this.nextSlideShowSlide;
 630         var nextSlide = this.slideShowSlide.parentNode.nextSibling;
 631         if (nextSlide && nextSlide.nodeType==3)
 632                 nextSlide = nextSlide.nextSibling;
 633
 634         if (nextSlide) {
 635                 nextSlide = nextSlide.getElementsByTagName('a')[0];
 636                 this.nextSlideShowSlide = nextSlide;
 637                 return nextSlide.href;
 638         }
 639         else {
 640                 var row = this.slideShowSlide.parentNode.parentNode;
 641                 var first = row.firstChild;
 642                 if (first.nodeType==3)
 643                         first = first.nextSibling;
 644                 this.nextSlideShowSlide = first.getElementsByTagName('a')[0];
 645                 return this.nextSlideShowSlide.href;
 646         }
 647 };
 648
 649 FilmSlider.prototype.stopSlideShow = function() {
 650         raiseMouseEvent(this.slideShowSlide, 'click');
 651         var index = parseInt(this.selectedSlide.getAttribute('portfolio:position'));
 652         this.centerSlide(index);
 653 };
 654
 655
 656 /* UTILS */
 657 function Point(x, y) {
 658         this.x = Math.round(x);
 659         this.y = Math.round(y);
 660 }
 661 Point.prototype.diff = function(point) { return new Point(this.x - point.x, this.y - point.y); };
 662 Point.prototype.add = function(point) { return new Point(this.x + point.x, this.y + point.y); };
 663 Point.prototype.mul = function(k) { return new Point(this.x * k, this.y *k)};
 664 Point.prototype.toString = function() { return "(" + String(this.x) + ", " + String(this.y) + ")"; };
 665
 666 })();