git.sesse.net Git - pr0n/blob - files/pr0n-fullscreen.js

   1 var req;
   2
   3 function init_ajax()
   4 {
   5         req = false;
   6
   7         if (window.XMLHttpRequest) {
   8                 // Mozilla/Safari
   9                 try {
  10                         req = new XMLHttpRequest();
  11                 } catch(e) {
  12                         req = false;
  13                 }
  14         } else if (window.ActiveXObject) {
  15                 // IE/Windows
  16                 try {
  17                         req = new ActiveXObject("Msxml2.XMLHTTP");
  18                 } catch(e) {
  19                         try {
  20                                 req = new ActiveXObject("Microsoft.XMLHTTP");
  21                         } catch(e) {
  22                                 req = false;
  23                         }
  24                 }
  25         }
  26 }
  27
  28 function find_width()
  29 {
  30         if (typeof(window.innerWidth) == 'number') {
  31                 // non-IE
  32                 return [window.innerWidth, window.innerHeight];
  33         } else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
  34                 // IE 6+ in 'standards compliant mode'
  35                 return [document.documentElement.clientWidth, document.documentElement.clientHeight];
  36         } else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
  37                 // IE 4-compatible
  38                 return [document.body.clientWidth, document.body.clientHeight];
  39         }
  40         return [null,null];
  41 }
  42
  43 /*
  44  * pr0n can resize to any size we'd like, but we're much more likely
  45  * to have this set of fixed-resolution screens cached, so to increase
  46  * performance, we round down to the closest fit and use that. This
  47  * function is a pessimal estimate of what thumbnail size we can _always_
  48  * fit on the screen -- it's right if and only if all images are 4:3
  49  * (and landscape). If individual size information is available, use
  50  * pick_image_size, below.
  51  */
  52 var fixed_sizes = [
  53         [ 2048, 1536 ],
  54         [ 1920, 1440 ],
  55         [ 1600, 1200 ],
  56         [ 1400, 1050 ],
  57         [ 1280, 960 ],
  58         [ 1152, 864 ],
  59         [ 1024, 768 ],
  60         [ 800, 600 ],
  61         [ 640, 480 ],
  62         [ 512, 384 ],
  63         [ 320, 256 ],
  64         [ 240, 192 ],
  65         [ 120, 96 ],
  66         [ 80, 64 ]
  67 ];
  68 function max_image_size(screen_size)
  69 {
  70         var i;
  71         for (i = 0; i < fixed_sizes.length; ++i) {
  72                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
  73                         return fixed_sizes[i];
  74                 }
  75         }
  76         return [ 80, 64 ];
  77 }
  78
  79 function pick_image_size(screen_size, image_size)
  80 {
  81         var i;
  82         for (i = 0; i < fixed_sizes.length; ++i) {
  83                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
  84                 // inaccuracies :-)
  85                 var thumbxres = fixed_sizes[i][0];
  86                 var thumbyres = fixed_sizes[i][1];
  87                 var width = image_size[0];
  88                 var height = image_size[1];
  89
  90                 if (!(thumbxres >= width && thumbyres >= height)) {
  91                         var sfh = width / thumbxres;
  92                         var sfv = height / thumbyres;
  93                         if (sfh > sfv) {
  94                                 width  /= sfh;
  95                                 height /= sfh;
  96                         } else {
  97                                 width  /= sfv;
  98                                 height /= sfv;
  99                         }
 100                         width = Math.floor(width);
 101                         height = Math.floor(height);
 102                 }
 103
 104                 if (screen_size[0] >= width && screen_size[1] >= height) {
 105                         // be sure _not_ to return a reference
 106                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
 107                 }
 108         }
 109         return [ 80, 64 ];
 110 }
 111
 112 function replace_image_element(url, element_id, parent_node)
 113 {
 114         var img = document.getElementById(element_id);
 115         if (img !== null) {
 116                 img.src = "data:";
 117                 img.parentNode.removeChild(img);
 118         }
 119
 120         img = document.createElement("img");
 121         img.id = element_id;
 122         img.alt = "";
 123
 124         if (img.src != url) {
 125                 img.src = url;
 126         }
 127
 128         parent_node.appendChild(img);
 129         return img;
 130 }
 131
 132 function display_image(width, height, evt, filename, element_id)
 133 {
 134         var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/nobox/" + filename;
 135         var main = document.getElementById("iehack");
 136         var img = replace_image_element(url, element_id, main);
 137         img.style.position = "absolute";
 138         img.style.left = "0px";
 139         img.style.top = "0px";
 140
 141         if (global_infobox != 'nobox/') {
 142                 var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
 143                 var boximg = replace_image_element(url, element_id + "_box", main);
 144
 145                 boximg.style.position = "absolute";
 146                 boximg.style.left = "0px";
 147                 boximg.style.bottom = "-1px";
 148         }
 149
 150         return img;
 151 }
 152
 153 function display_image_num(num, element_id)
 154 {
 155         var screen_size = find_width();
 156         var adjusted_size;
 157
 158         if (global_image_list[num][2] == -1) {
 159                 // no size information, use our pessimal guess
 160                 adjusted_size = max_image_size(screen_size);
 161         } else {
 162                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 163         }
 164
 165         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 166
 167         if (element_id == "image") {
 168                 // we want to shrink the box as much as possible if we know the true
 169                 // size of the image
 170                 center_image(num);
 171
 172                 // replace the anchor part (if any) with the image number
 173                 window.location.hash = "#" + (num+1);
 174         }
 175
 176         return img;
 177 }
 178
 179 function prepare_preload(img, num)
 180 {
 181         // cancel any pending preload
 182         var preload = document.getElementById("preload");
 183         if (preload !== null) {
 184                 preload.src = "data:";
 185                 preload.parentNode.removeChild(preload);
 186         }
 187
 188         var preload_box = document.getElementById("preload_box");
 189         if (preload_box !== null) {
 190                 preload_box.src = "data:";
 191                 preload_box.parentNode.removeChild(preload_box);
 192         }
 193
 194         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 195         // completeness first; should at least be _somewhat_ better
 196         if (img.complete) {
 197                 display_image_num(num, "preload");
 198         } else {
 199                 img.onload = function() { display_image_num(num, "preload"); };
 200         }
 201 }
 202
 203 function can_go_next()
 204 {
 205         return (global_image_num < global_image_list.length - 1);
 206 }
 207
 208 function can_go_previous()
 209 {
 210         return (global_image_num > 0);
 211 }
 212
 213 function set_opacity(id, amount)
 214 {
 215         var elem = document.getElementById(id);
 216         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
 217                 elem.style.opacity = amount;
 218         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
 219                 elem.style.mozOpacity = amount;
 220         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
 221                 if (elem.style.filter.indexOf("alpha") == -1) {
 222                         // add an alpha filter if there isn't one already
 223                         if (elem.style.filter) {
 224                                 elem.style.filter += " ";
 225                         } else {
 226                                 elem.style.filter = "";
 227                         }
 228                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
 229                 } else {
 230                         // ugh? this seems to break in color index mode...
 231                         if (typeof(elem.filters) == 'unknown') {
 232                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
 233                         } else {
 234                                 elem.filters.alpha.opacity = (amount * 100.0);
 235                         }
 236                 }
 237         } else {                             // no alpha support
 238                 if (amount > 0.5) {
 239                         elem.style.visibility = "visible";
 240                         elem.style.zorder = 1;
 241                 } else {
 242                         elem.style.visibility = "hidden";
 243                 }
 244         }
 245 }
 246
 247 function center_image(num)
 248 {
 249         var screen_size = find_width();
 250         var width, height;
 251
 252         if (global_image_list[num][2] == -1) {
 253                 // no size information, use our pessimal guess
 254                 var adjusted_size = max_image_size(screen_size);
 255                 width = adjusted_size[0];
 256                 height = adjusted_size[1];
 257         } else {
 258                 // use the exact information
 259                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 260                 width = adjusted_size[2];
 261                 height = adjusted_size[3];
 262         }
 263
 264         // center the image on-screen
 265         var main = document.getElementById("main");
 266         main.style.position = "absolute";
 267         main.style.left = (screen_size[0] - width) / 2 + "px";
 268         main.style.top = (screen_size[1] - height) / 2 + "px";
 269         main.style.width = width + "px";
 270         main.style.height = height + "px";
 271         main.style.lineHeight = height + "px";
 272 }
 273
 274 function relayout()
 275 {
 276         var img = display_image_num(global_image_num, "image");
 277         if (can_go_next()) {
 278                 prepare_preload(img, global_image_num + 1);
 279         }
 280
 281         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 282         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 283         set_opacity("close", 0.7);
 284 }
 285
 286 function go_previous()
 287 {
 288         if (!can_go_previous()) {
 289                 return;
 290         }
 291
 292         var img = display_image_num(--global_image_num, "image");
 293         if (can_go_previous()) {
 294                 set_opacity("previous", 0.7);
 295                 prepare_preload(img, global_image_num - 1);
 296         } else {
 297                 set_opacity("previous", 0.1);
 298         }
 299         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 300 }
 301
 302 function go_next()
 303 {
 304         if (!can_go_next()) {
 305                 return;
 306         }
 307
 308         var img = display_image_num(++global_image_num, "image");
 309         if (can_go_next()) {
 310                 set_opacity("next", 0.7);
 311                 prepare_preload(img, global_image_num + 1);
 312         } else {
 313                 set_opacity("next", 0.1);
 314         }
 315         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 316 }
 317
 318 function do_close()
 319 {
 320         window.location = global_return_url;
 321 }
 322
 323 function draw_text(msg)
 324 {
 325         // remove any text we might have left
 326         var text = document.getElementById("text");
 327         if (text !== null) {
 328                 text.parentNode.removeChild(text);
 329         }
 330
 331         text = document.createElement("p");
 332         text.id = "text";
 333         text.style.position = "absolute";
 334         text.style.color = "white";
 335         text.style.lineHeight = "24px";
 336         text.style.font = "24px verdana, arial, sans-serif";
 337         text.innerHTML = msg;
 338
 339         var main = document.getElementById("main");
 340         main.appendChild(text);
 341
 342         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 343         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 344 }
 345
 346 function fade_text(opacity)
 347 {
 348         set_opacity("text", opacity);
 349         if (opacity > 0.0) {
 350                 opacity -= 0.03;
 351                 if (opacity < 0.0) {
 352                         opacity = 0.0;
 353                 }
 354                 setTimeout("fade_text(" + opacity + ")", 30);
 355         } else {
 356                 var text = document.getElementById("text");
 357                 if (text !== null) {
 358                         text.parentNode.removeChild(text);
 359                 }
 360         }
 361 }
 362
 363 function select_image(evt, filename, selected)
 364 {
 365         if (!req) {
 366                 return;
 367         }
 368
 369         if (selected) {
 370                 draw_text("Selecting " + filename + "...");
 371         } else {
 372                 draw_text("Unselecting " + filename + "...");
 373         }
 374
 375         req.open("POST", "http://" + global_vhost + "/select", false);
 376         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 377         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
 378
 379         setTimeout("fade_text(0.99)", 30);
 380 }
 381
 382 function key_down(which)
 383 {
 384         if (which == 39) {   // right
 385                 if (can_go_next()) {
 386                         set_opacity("next", 0.99);
 387                 }
 388         } else if (which == 37) {   // left
 389                 if (can_go_previous()) {
 390                         set_opacity("previous", 0.99);
 391                 }
 392         } else if (which == 27) {   // escape
 393                 set_opacity("close", 0.99);
 394         } else {
 395                 check_for_hash_change();
 396         }
 397 }
 398
 399 function key_up(which) {
 400         if (which == 39) {   // right
 401                 if (can_go_next()) {
 402                         set_opacity("next", 0.7);
 403                         go_next();
 404                 }
 405         } else if (which == 37) {   // left
 406                 if (can_go_previous()) {
 407                         set_opacity("previous", 0.7);
 408                         go_previous();
 409                 }
 410         } else if (which == 27) {   // escape
 411                 set_opacity("close", 0.7);
 412                 do_close();
 413         } else if (which == 32 && global_select) {   // space
 414                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
 415         } else if (which == 85 && global_select) {   // u
 416                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
 417         } else {
 418                 check_for_hash_change();
 419         }
 420 }
 421
 422 // enable the horrible horrible IE PNG hack
 423 function ie_png_hack()
 424 {
 425         var vstr = navigator.appVersion.split("MSIE");
 426         var v = parseFloat(vstr[1]);
 427         if (v >= 5.5 && v < 7.0 && document.body.filters) {
 428                 var next = document.getElementById("next");
 429                 next.outerHTML = "<span id=\"next\" style=\"display: inline-block; position: absolute; bottom: 0px; right: 0px; width: 50px; height: 50px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + next.src + "')\" onmousedown=\"if (can_go_next()) set_opacity('next', 1.0)\" onmouseup=\"if (can_go_next()) { set_opacity('next', 0.7); go_next(); }\" onmouseout=\"if (can_go_next()) { set_opacity('next', 0.7); }\" />";
 430
 431                 var previous = document.getElementById("previous");
 432                 previous.outerHTML = "<span id=\"previous\" style=\"display: inline-block; position: absolute; bottom: 0px; right: 0px; width: 50px; height: 50px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + previous.src + "')\" onmousedown=\"if (can_go_previous()) set_opacity('previous', 1.0)\" onmouseup=\"if (can_go_previous()) { set_opacity('previous', 0.7); go_previous(); }\" onmouseout=\"if (can_go_previous()) { set_opacity('previous', 0.7); }\" />";
 433
 434                 var close = document.getElementById("close");
 435                 close.outerHTML = "<span id=\"close\" style=\"display: inline-block; position: absolute; top: 0px; right: 0px; width: 50px; height: 50px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + close.src + "')\" onmousedown=\"set_opacity('close', 1.0)\" onmouseup=\"set_opacity('close', 0.7); do_close();\" onmouseout=\"set_opacity('close', 0.7);\" />";
 436         }
 437 }
 438
 439 function parse_image_num(default_value) {
 440         var num = parseInt(window.location.hash.substr(1));
 441         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 442                 return (num - 1);
 443         } else {
 444                 return default_value;
 445         }
 446 }
 447
 448 function check_for_hash_change() {
 449         var num = parse_image_num(-1);
 450         if (num != -1 && num != global_image_num) {
 451                 global_image_num = num;
 452                 relayout();
 453         }
 454 }