include/show.js

   1 /*
   2         $Id$
   3
   4         This is a part of mkgallery.pl suite
   5         http://www.average.org/mkgallery/
   6
   7         Uses mootools (1.2) http://www.mootools.net/
   8         Inspired by slideshow http://www.phatfusion.net/slideshow/
   9 */
  10
  11 /*
  12         Slideshow
  13
  14   - On show image: find this and next urls; put in place
  15     those that are already here; free unneeded; initiate download of
  16     the rest; if needed image is ready then initiate "transitioning", else
  17     initiate "loading".
  18   - On load complete: if this is the target image, initiate "transitioning".
  19   - On "loading": show "loading" image
  20   - On "transitioning": hide "loading" image; initiate FX animation to the
  21     needed image.
  22   - On animation complete: blank previous image; if "playing" then schedule
  23     autoswitch to next image in the future.
  24   - On autoswitch to next image: if "playing" then switch to next image.
  25   - On switch to next image: if next exists, show next image, else show
  26     "last image" message.
  27   - On switch to prev image: if prev exists, show prev image, else show
  28     "first image" message.
  29   - On "play": make "playing"; switch to next image.
  30   - On "stop": if "playing" cancel autoswitch; break "playing".
  31   - On "start show": set up things; set "playing" state; show needed image.
  32   - On "stop show": cancel any schedules, hide things.
  33   - On resize: recalculate existing image size and position; determine
  34     what image is needed; if it is not the one on display then request
  35     "show image" for the new image.
  36 */
  37
  38 var Show = new Class({
  39
  40         getOptions: function(){
  41                 return {
  42                         cbStart: function(){ alert('show start undefined'); },
  43                         cbExit: function(){ alert('show exit undefined'); },
  44                         percentage: 98,
  45                         delay: 5000,
  46                         fxduration: 200,
  47                 }
  48         },
  49
  50         initialize: function(vimgs, container, controls, options){
  51                 this.setOptions(this.getOptions(), options);
  52                 this.vimgs = vimgs;
  53                 this.container = container;
  54                 this.controls = controls;
  55                 this.controls.registershow(this);
  56                 this.timer = 0;
  57                 this.delay = this.options.delay;
  58                 this.cache = {
  59                         prev: {},
  60                         curr: {},
  61                         next: {},
  62                 };
  63 /*
  64  *  thescripts.com/forum/thread170365.html
  65  */
  66                 var hashpos = document.URL.search(/#/);
  67                 if (hashpos > 0) {
  68                         this.baseurl = document.URL.slice(0,hashpos);
  69                 } else {
  70                         this.baseurl = document.URL
  71                 }
  72
  73                 this.updatecoords();
  74                 this.prevdisplay = new Element('img').
  75                         setStyle('opacity', 0).
  76                         injectInside(this.container.domelement());
  77                 this.ondisplay = this.prevdisplay.clone().
  78                         injectInside(this.container.domelement());
  79                 this.loadingdiv = new Element('div').
  80                 addClass('loading').setStyles({
  81                         position: 'absolute',
  82                         top: 0,
  83                         left: 0,
  84                         zIndex: 4,
  85                         display: 'none',
  86                         width: this.coords.width,
  87                         height: this.coords.height,
  88                 }).injectInside(this.container.domelement());
  89
  90                 window.addEvent('resize', this.resizer.bind(this))
  91         },
  92
  93         /* event handler for window resize */
  94
  95         resizer: function(){
  96                 this.updatecoords();
  97                 var newstyle = this.calcsize(this.cache.curr);
  98                 this.ondisplay.setStyles(newstyle);
  99                 /* check if we need reload */
 100         },
 101
 102         /* prev, play, stop, next, exit, comm are methods for button presses */
 103
 104         prev: function(){
 105                 this.cleartimer();
 106                 this.stopfx();
 107                 if (this.currentid > 0) {
 108                         this.show(this.currentid-1);
 109                 } else {
 110                         /* alert('show.prev called beyond first element'); */
 111                 }
 112         },
 113
 114         stop: function(){
 115                 this.cleartimer()
 116                 this.isplaying = false;
 117                 this.controls.running(0);
 118         },
 119
 120         play: function(){
 121                 this.isplaying = true;
 122                 this.timer = this.autonext.delay(this.delay,this);
 123                 this.controls.running(1);
 124         },
 125
 126         toggleplay: function(){
 127                 if (this.isplaying) { this.stop(); }
 128                 else { this.play(); }
 129         },
 130
 131         next: function(){
 132                 this.cleartimer();
 133                 this.stopfx();
 134                 if (this.currentid < this.vimgs.length-1) {
 135                         this.show(this.currentid+1);
 136                 } else {
 137                         /* alert('show.next called beyond last element'); */
 138                 }
 139         },
 140
 141         exit: function(){
 142                 this.cleartimer();
 143                 this.stopfx();
 144                 this.prevdisplay.setStyle('display', 'none');
 145                 this.ondisplay.setStyle('display', 'none');
 146                 document.location.href = this.baseurl;
 147                 this.options.cbExit();
 148         },
 149
 150         comm: function(){
 151                 /* alert('show.comm called, do nothing'); */
 152         },
 153
 154         /* Entry point: called to start doing things */
 155
 156         start: function(id, play){
 157                 this.options.cbStart();
 158                 this.isplaying = play;
 159                 this.controls.running(this.isplaying);
 160                 this.updatecoords();
 161                 this.show(id);
 162                 return false; /* to make it usable from href links */
 163         },
 164
 165         /* "Private" methods to do the real job */
 166
 167         show: function(id){
 168                 /* alert('called show.show('+id+')'); */
 169                 this.currentid = id;
 170                 var newcache = {
 171                         prev: (id > 0)?this.prepare(id-1):{},
 172                         curr: this.prepare(id),
 173                         next: (id < (this.vimgs.length-1))?this.prepare(id+1):{},
 174                 };
 175                 delete this.cache;
 176                 this.cache = newcache;
 177                 if (this.cache.curr.ready) {
 178                         this.display(this.cache.curr);
 179                 } else {
 180                         this.pendingload = true;
 181                         this.showloading();
 182                 }
 183                 document.location.href = this.baseurl+'#'+this.vimgs[id][0];
 184                 this.controls.info(id,this.vimgs.length,
 185                                 '#'+this.vimgs[id][0],
 186                                 this.vimgs[id][1]);
 187         },
 188
 189         prepare: function(id){
 190                 var vi;
 191                 for (vi=0;vi<this.vimgs[id][2].length-1;vi++) {
 192                         if ((this.vimgs[id][2][vi][0] >= this.target.width) ||
 193                             (this.vimgs[id][2][vi][1] >= this.target.height)) {
 194                                 break;
 195                         }
 196                 }
 197                 /* alert('prepare id='+id+', selected '+vi+' at '+
 198                         this.vimgs[id][2][vi][0]+'x'+
 199                         this.vimgs[id][2][vi][1]); */
 200                 var cachel;
 201                 ['prev', 'curr', 'next'].each(function(el){
 202                         if (this.cache[el] &&
 203                             this.cache[el].id == id &&
 204                             this.cache[el].vi == vi) {
 205                                 cachel = this.cache[el];
 206                         }
 207                 }.bind(this));
 208                 if (! cachel) {
 209                         cachel = {
 210                                 id: id,
 211                                 vi: vi,
 212                                 ready: false,
 213                                 url: this.vimgs[id][2][vi][2],
 214                         };
 215                         cachel.img = this.bgload(cachel);
 216                 }
 217                 return cachel;
 218         },
 219
 220         bgload: function(cachel){
 221                 /* alert('bgload: id='+cachel.id+' vi='+cachel.vi+
 222                         ' url='+cachel.url); */
 223                 return new Asset.image(this.vimgs[cachel.id][2][cachel.vi][2],{
 224                         id: this.vimgs[cachel.id][0],
 225                         title: this.vimgs[cachel.id][1],
 226                         onload: this.loadcomplete.bind(this,[cachel]),
 227                 });
 228         },
 229
 230         loadcomplete: function(cachel){
 231                 /* alert('loadcomplete '+cachel.url+' id='+cachel.id+
 232                         ' vi='+cachel.vi); */
 233                 cachel.ready = true;
 234                 if (cachel.id == this.currentid &&
 235                     this.pendingload) {
 236                         this.pendingload = false;
 237                         this.hideloading();
 238                         this.display(cachel);
 239                 }
 240         },
 241
 242         display: function(cachel){
 243                 var newimg = cachel.img.clone().
 244                 set('class', 'mainformat').
 245                 setProperty('alt', 'Current Image').
 246                 setStyles(this.calcsize(cachel)).
 247                 setStyles({
 248                         zIndex: 3,
 249                         opacity: 0,
 250                 });
 251                 this.ondisplay.replaces(this.prevdisplay).
 252                 setProperty('alt', 'Previous Image').
 253                 setStyle('zIndex', 2);
 254                 this.prevdisplay = this.ondisplay;
 255                 this.ondisplay = newimg.
 256                 injectInside(this.container.domelement());
 257                 this.effect();
 258         },
 259
 260         effect: function(){
 261                 this.fx = new Fx.Tween(this.ondisplay, {
 262                         duration: this.options.fxduration,
 263                 });
 264                 this.fx.addEvent('complete',this.displaycomplete.bind(this));
 265                 this.fx.start('opacity', 0, 1);
 266         },
 267
 268         displaycomplete: function(){
 269                 this.prevdisplay.setStyle('display', 'none');
 270                 if (this.isplaying) {
 271                         this.timer = this.autonext.delay(this.delay,this);
 272                 }
 273         },
 274
 275         autonext: function(){
 276                 if (this.isplaying) {
 277                         if (this.currentid < this.vimgs.length-1) {
 278                                 this.show(this.currentid+1);
 279                         } else {
 280                                 this.exit();
 281                         }
 282                 }
 283         },
 284
 285         calcsize: function(cachel){
 286                 var factor = 1;
 287                 var candidate;
 288                 candidate = this.target.width /
 289                                 this.vimgs[cachel.id][2][cachel.vi][0];
 290                 if (factor > candidate) { factor = candidate; }
 291                 candidate = this.target.height /
 292                                 this.vimgs[cachel.id][2][cachel.vi][1];
 293                 if (factor > candidate) { factor = candidate; }
 294                 var w = Math.round(this.vimgs[cachel.id][2][cachel.vi][0] *
 295                         factor);
 296                 var h = Math.round(this.vimgs[cachel.id][2][cachel.vi][1] *
 297                         factor);
 298                 var t = Math.round((this.coords.height-h)/2);
 299                 var l = Math.round((this.coords.width-w)/2);
 300                 /* alert('new size: '+w+'x'+h+'+'+l+'+'+t); */
 301                 return {
 302                         position: 'absolute',
 303                         top: t+'px',
 304                         left: l+'px',
 305                         width: w,
 306                         height: h,
 307                 };
 308         },
 309
 310         showloading: function(){
 311                 this.loadingdiv.setStyle('display', 'block');
 312         },
 313
 314         hideloading: function(){
 315                 this.loadingdiv.setStyle('display', 'none');
 316         },
 317
 318         cleartimer: function(){
 319                 if (this.isplaying) { $clear(this.timer); }
 320         },
 321
 322         stopfx: function(){
 323                 if (this.fx) this.fx.cancel();
 324         },
 325
 326         updatecoords: function(){
 327                 this.coords = this.container.getCoordinates();
 328                 this.target = {
 329                         width: Math.round(this.coords.width *
 330                                                 this.options.percentage / 100),
 331                         height: Math.round(this.coords.height *
 332                                                 this.options.percentage / 100),
 333                 };
 334                 /* alert('coords: '+this.coords.width+'x'+this.coords.height+
 335                      ', target: '+this.target.width+'x'+this.target.height); */
 336         },
 337
 338 });
 339 Show.implement(new Options);
 340 Show.implement(new Events);
 341