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.container);
  77                 this.ondisplay = new Element('img').
  78                         setStyle('opacity', 0).
  79                         injectInside(this.container.container);
  80                 this.loadingdiv = new Element('div').
  81                 addClass('loading').setStyles({
  82                         position: 'absolute',
  83                         top: 0,
  84                         left: 0,
  85                         zIndex: 4,
  86                         display: 'none',
  87                         width: this.coords.width,
  88                         height: this.coords.height,
  89                 }).injectInside(this.container.container);
  90
  91                 window.addEvent('resize', this.resizer.bind(this))
  92         },
  93
  94         /* event handler for window resize */
  95
  96         resizer: function(){
  97                 this.updatecoords();
  98                 var newstyle = this.calcsize(this.cache.curr);
  99                 this.ondisplay.setStyles(newstyle);
 100                 /* check if we need reload */
 101         },
 102
 103         /* prev, play, stop, next, exit, comm are methods for button presses */
 104
 105         prev: function(){
 106                 if (this.currentid > 0) {
 107                         this.show(this.currentid-1);
 108                 } else {
 109                         /* alert('show.prev called beyond first element'); */
 110                 }
 111         },
 112
 113         stop: function(){
 114                 if (this.isplaying) { $clear(this.timer); }
 115                 this.isplaying = false;
 116                 $clear(this.timer);
 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                 if (this.currentid < this.vimgs.length-1) {
 133                         this.show(this.currentid+1);
 134                 } else {
 135                         /* alert('show.next called beyond last element'); */
 136                 }
 137         },
 138
 139         exit: function(){
 140                 if (this.isplaying) { $clear(this.timer); }
 141                 this.prevdisplay.setStyle('display', 'none');
 142                 this.ondisplay.setStyle('display', 'none');
 143                 this.stopfx();
 144                 this.options.cbExit();
 145                 document.location.href = this.baseurl;
 146         },
 147
 148         comm: function(){
 149                 /* alert('show.comm called, do nothing'); */
 150         },
 151
 152         /* Entry point: called to start doing things */
 153
 154         start: function(id, play){
 155                 this.options.cbStart();
 156                 this.isplaying = play;
 157                 this.controls.running(this.isplaying);
 158                 this.updatecoords();
 159                 this.show(id);
 160                 return false; /* to make it usable from href links */
 161         },
 162
 163         /* "Private" methods to do the real job */
 164
 165         show: function(id){
 166                 /* alert('called show.show('+id+')'); */
 167                 this.currentid = id;
 168                 var newcache = {
 169                         prev: (id > 0)?this.prepare(id-1):{},
 170                         curr: this.prepare(id),
 171                         next: (id < (this.vimgs.length-1))?this.prepare(id+1):{},
 172                 };
 173                 delete this.cache;
 174                 this.cache = newcache;
 175                 if (this.cache.curr.ready) {
 176                         this.display(this.cache.curr);
 177                 } else {
 178                         this.pendingload = true;
 179                         this.showloading();
 180                 }
 181                 document.location.href = this.baseurl+'#'+this.vimgs[id][0];
 182                 this.controls.info(id,this.vimgs.length,
 183                                 '#'+this.vimgs[id][0],
 184                                 this.vimgs[id][1]);
 185         },
 186
 187         prepare: function(id){
 188                 var vi;
 189                 for (vi=0;vi<this.vimgs[id][2].length-1;vi++) {
 190                         if ((this.vimgs[id][2][vi][0] >= this.target.width) ||
 191                             (this.vimgs[id][2][vi][1] >= this.target.height)) {
 192                                 break;
 193                         }
 194                 }
 195                 /* alert('prepare id='+id+', selected '+vi+' at '+
 196                         this.vimgs[id][2][vi][0]+'x'+
 197                         this.vimgs[id][2][vi][1]); */
 198                 var cachel;
 199                 ['prev', 'curr', 'next'].each(function(el){
 200                         if (this.cache[el] &&
 201                             this.cache[el].id == id &&
 202                             this.cache[el].vi == vi) {
 203                                 cachel = this.cache[el];
 204                         }
 205                 }.bind(this));
 206                 if (! cachel) {
 207                         cachel = {
 208                                 id: id,
 209                                 vi: vi,
 210                                 ready: false,
 211                                 url: this.vimgs[id][2][vi][2],
 212                         };
 213                         cachel.img = this.bgload(cachel);
 214                 }
 215                 return cachel;
 216         },
 217
 218         bgload: function(cachel){
 219                 /* alert('bgload: id='+cachel.id+' vi='+cachel.vi+
 220                         ' url='+cachel.url); */
 221                 return new Asset.image(this.vimgs[cachel.id][2][cachel.vi][2],{
 222                         id: this.vimgs[cachel.id][0],
 223                         title: this.vimgs[cachel.id][1],
 224                         onload: this.loadcomplete.bind(this,[cachel]),
 225                 });
 226         },
 227
 228         loadcomplete: function(cachel){
 229                 /* alert('loadcomplete '+cachel.url+' id='+cachel.id+
 230                         ' vi='+cachel.vi); */
 231                 cachel.ready = true;
 232                 if (cachel.id == this.currentid &&
 233                     this.pendingload) {
 234                         this.pendingload = false;
 235                         this.hideloading();
 236                         this.display(cachel);
 237                 }
 238         },
 239
 240         display: function(cachel){
 241                 var newstyle = this.calcsize(cachel);
 242                 var newimg = cachel.img.clone();
 243                 newimg.setStyles(newstyle);
 244                 newimg.setStyles({
 245                         zIndex: 3,
 246                         opacity: 0,
 247                 });
 248                 this.prevdisplay.dispose();
 249                 this.prevdisplay = this.ondisplay.clone().
 250                 setStyle('zIndex', 2).injectInside(this.container.container);
 251                 newimg.replaces(this.ondisplay);
 252                 this.ondisplay = newimg;
 253                 this.effect();
 254         },
 255
 256         effect: function(){
 257                 this.fx = new Fx.Tween(this.ondisplay, {
 258                         duration: this.options.fxduration,
 259                 });
 260                 this.fx.addEvent('complete',this.displaycomplete.bind(this));
 261                 this.fx.start('opacity', 0, 1);
 262         },
 263
 264         displaycomplete: function(){
 265                 this.prevdisplay.setStyle('display', 'none');
 266                 if (this.isplaying) {
 267                         this.timer = this.autonext.delay(this.delay,this);
 268                 }
 269         },
 270
 271         autonext: function(){
 272                 if (this.isplaying) {
 273                         if (this.currentid < this.vimgs.length-1) {
 274                                 this.show(this.currentid+1);
 275                         } else {
 276                                 this.exit();
 277                         }
 278                 }
 279         },
 280
 281         calcsize: function(cachel){
 282                 var factor = 1;
 283                 var candidate;
 284                 candidate = this.target.width /
 285                                 this.vimgs[cachel.id][2][cachel.vi][0];
 286                 if (factor > candidate) { factor = candidate; }
 287                 candidate = this.target.height /
 288                                 this.vimgs[cachel.id][2][cachel.vi][1];
 289                 if (factor > candidate) { factor = candidate; }
 290                 var w = Math.round(this.vimgs[cachel.id][2][cachel.vi][0] *
 291                         factor);
 292                 var h = Math.round(this.vimgs[cachel.id][2][cachel.vi][1] *
 293                         factor);
 294                 var t = Math.round((this.coords.height-h)/2);
 295                 var l = Math.round((this.coords.width-w)/2);
 296                 /* alert('new size: '+w+'x'+h+'+'+l+'+'+t); */
 297                 return {
 298                         position: 'absolute',
 299                         top: t+'px',
 300                         left: l+'px',
 301                         width: w,
 302                         height: h,
 303                 };
 304         },
 305
 306         showloading: function(){
 307                 this.loadingdiv.setStyle('display', 'block');
 308         },
 309
 310         hideloading: function(){
 311                 this.loadingdiv.setStyle('display', 'none');
 312         },
 313
 314         stopfx: function(){
 315                 if (this.fx) this.fx.cancel();
 316         },
 317
 318         updatecoords: function(){
 319                 this.coords = this.container.getCoordinates();
 320                 this.target = {
 321                         width: Math.round(this.coords.width *
 322                                                 this.options.percentage / 100),
 323                         height: Math.round(this.coords.height *
 324                                                 this.options.percentage / 100),
 325                 };
 326                 /* alert('coords: '+this.coords.width+'x'+this.coords.height+
 327                      ', target: '+this.target.width+'x'+this.target.height); */
 328         },
 329
 330 });
 331 Show.implement(new Options);
 332 Show.implement(new Events);
 333