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                 var dpr = find_dpr();
  33                 return [window.innerWidth * dpr, window.innerHeight * dpr];
  34         } else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
  35                 // IE 6+ in 'standards compliant mode'
  36                 return [document.documentElement.clientWidth, document.documentElement.clientHeight];
  37         } else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
  38                 // IE 4-compatible
  39                 return [document.body.clientWidth, document.body.clientHeight];
  40         }
  41         return [null,null];
  42 }
  43
  44 function find_dpr()
  45 {
  46         return window.devicePixelRatio || 1;
  47 }
  48
  49 /*
  50  * pr0n can resize to any size we'd like, but we're much more likely
  51  * to have this set of fixed-resolution screens cached, so to increase
  52  * performance, we round down to the closest fit and use that. This
  53  * function is a pessimal estimate of what thumbnail size we can _always_
  54  * fit on the screen -- it's right if and only if all images are 4:3
  55  * (and landscape). If individual size information is available, use
  56  * pick_image_size, below.
  57  */
  58 var fixed_sizes = [
  59         [ 2304, 1728 ],
  60         [ 2048, 1536 ],
  61         [ 1920, 1440 ],
  62         [ 1600, 1200 ],
  63         [ 1400, 1050 ],
  64         [ 1280, 960 ],
  65         [ 1152, 864 ],
  66         [ 1024, 768 ],
  67         [ 800, 600 ],
  68         [ 640, 480 ],
  69         [ 512, 384 ],
  70         [ 320, 256 ],
  71         [ 240, 192 ],
  72         [ 120, 96 ],
  73         [ 80, 64 ]
  74 ];
  75 function max_image_size(screen_size)
  76 {
  77         var i;
  78         for (i = 0; i < fixed_sizes.length; ++i) {
  79                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
  80                         return fixed_sizes[i];
  81                 }
  82         }
  83         return [ 80, 64 ];
  84 }
  85
  86 function pick_image_size(screen_size, image_size)
  87 {
  88         var i;
  89         for (i = 0; i < fixed_sizes.length; ++i) {
  90                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
  91                 // inaccuracies :-)
  92                 var thumbxres = fixed_sizes[i][0];
  93                 var thumbyres = fixed_sizes[i][1];
  94                 var width = image_size[0];
  95                 var height = image_size[1];
  96
  97                 if (!(thumbxres >= width && thumbyres >= height)) {
  98                         var sfh = width / thumbxres;
  99                         var sfv = height / thumbyres;
 100                         if (sfh > sfv) {
 101                                 width  /= sfh;
 102                                 height /= sfh;
 103                         } else {
 104                                 width  /= sfv;
 105                                 height /= sfv;
 106                         }
 107                         width = Math.floor(width);
 108                         height = Math.floor(height);
 109                 }
 110
 111                 if (screen_size[0] >= width && screen_size[1] >= height) {
 112                         // be sure _not_ to return a reference
 113                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
 114                 }
 115         }
 116         return [ 80, 64 ];
 117 }
 118
 119 function replace_image_element(url, element_id, parent_node)
 120 {
 121         var img = document.getElementById(element_id);
 122         if (img !== null) {
 123                 if (img.src === url) {
 124                         return img;
 125                 }
 126                 img.parentNode.removeChild(img);
 127         }
 128
 129         img = document.createElement("img");
 130         img.id = element_id;
 131         img.alt = "";
 132         img.src = url;
 133         parent_node.appendChild(img);
 134         return img;
 135 }
 136
 137 function rename_element(old_name, new_name)
 138 {
 139         // Remove any element that's in the way.
 140         var elem = document.getElementById(new_name);
 141         if (elem !== null) {
 142                 elem.parentNode.removeChild(elem);
 143         }
 144
 145         elem = document.getElementById(old_name);
 146         if (elem !== null) {
 147                 elem.id = new_name;
 148         }
 149         return elem;
 150 }
 151
 152 function display_image(width, height, evt, filename, element_id)
 153 {
 154         var url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/nobox/" + filename;
 155         var main = document.getElementById("iehack");
 156         var preload = document.getElementById("preload");
 157         var dpr = find_dpr();
 158         var img;
 159         // See if we have a preload going on that we can reuse.
 160         if (element_id == "image" && preload !== null && preload.src == url) {
 161                 rename_element("preload_box", "image_box");
 162                 img = rename_element("preload", "image");
 163         } else {
 164                 img = replace_image_element(url, element_id, main);
 165         }
 166         img.style.position = "absolute";
 167         img.style.left = "0px";
 168         img.style.top = "0px";
 169         img.style.transformOrigin = "top left";
 170         img.style.transform = "scale(" + (1.0 / dpr) + ")";
 171
 172         if (global_infobox != 'nobox/') {
 173                 var url;
 174                 if (dpr == 1) {
 175                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
 176                 } else {
 177                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "@" + dpr.toFixed(2) + "/box/" + filename;
 178                 }
 179                 var boximg = replace_image_element(url, element_id + "_box", main);
 180
 181                 boximg.style.position = "absolute";
 182                 boximg.style.left = "0px";
 183                 boximg.style.bottom = "-1px";
 184                 boximg.style.transformOrigin = "bottom left";
 185                 boximg.style.transform = "scale(" + (1.0 / dpr) + ")";
 186         }
 187
 188         return img;
 189 }
 190
 191 function display_image_num(num, element_id)
 192 {
 193         var screen_size = find_width();
 194         var adjusted_size;
 195
 196         if (global_image_list[num][2] == -1) {
 197                 // no size information, use our pessimal guess
 198                 adjusted_size = max_image_size(screen_size);
 199         } else {
 200                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 201         }
 202
 203         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 204
 205         if (element_id == "image") {
 206                 // we want to shrink the box as much as possible if we know the true
 207                 // size of the image
 208                 center_image(num);
 209
 210                 // replace the anchor part (if any) with the image number
 211                 window.location.hash = "#" + (num+1);
 212         }
 213
 214         return img;
 215 }
 216
 217 function prepare_preload(img, num)
 218 {
 219         // cancel any pending preload
 220         var preload = document.getElementById("preload");
 221         if (preload !== null) {
 222                 preload.parentNode.removeChild(preload);
 223         }
 224
 225         var preload_box = document.getElementById("preload_box");
 226         if (preload_box !== null) {
 227                 preload_box.parentNode.removeChild(preload_box);
 228         }
 229
 230         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 231         // completeness first; should at least be _somewhat_ better
 232         if (img.complete) {
 233                 display_image_num(num, "preload");
 234         } else {
 235                 img.onload = function() { display_image_num(num, "preload"); };
 236         }
 237 }
 238
 239 function can_go_next()
 240 {
 241         return (global_image_num < global_image_list.length - 1);
 242 }
 243
 244 function can_go_previous()
 245 {
 246         return (global_image_num > 0);
 247 }
 248
 249 function set_opacity(id, amount)
 250 {
 251         var elem = document.getElementById(id);
 252         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
 253                 elem.style.opacity = amount;
 254         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
 255                 elem.style.mozOpacity = amount;
 256         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
 257                 if (elem.style.filter.indexOf("alpha") == -1) {
 258                         // add an alpha filter if there isn't one already
 259                         if (elem.style.filter) {
 260                                 elem.style.filter += " ";
 261                         } else {
 262                                 elem.style.filter = "";
 263                         }
 264                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
 265                 } else {
 266                         // ugh? this seems to break in color index mode...
 267                         if (typeof(elem.filters) == 'unknown') {
 268                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
 269                         } else {
 270                                 elem.filters.alpha.opacity = (amount * 100.0);
 271                         }
 272                 }
 273         } else {                             // no alpha support
 274                 if (amount > 0.5) {
 275                         elem.style.visibility = "visible";
 276                         elem.style.zorder = 1;
 277                 } else {
 278                         elem.style.visibility = "hidden";
 279                 }
 280         }
 281 }
 282
 283 function center_image(num)
 284 {
 285         var screen_size = find_width();
 286         var dpr = find_dpr();
 287         var width, height;
 288
 289         if (global_image_list[num][2] == -1) {
 290                 // no size information, use our pessimal guess
 291                 var adjusted_size = max_image_size(screen_size);
 292                 width = adjusted_size[0];
 293                 height = adjusted_size[1];
 294         } else {
 295                 // use the exact information
 296                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 297                 width = adjusted_size[2];
 298                 height = adjusted_size[3];
 299         }
 300
 301         // center the image on-screen
 302         var main = document.getElementById("main");
 303         main.style.position = "absolute";
 304         main.style.left = (((screen_size[0] - width) / 2) / dpr) + "px";
 305         main.style.top = (((screen_size[1] - height) / 2) / dpr) + "px";
 306         main.style.width = (width / dpr) + "px";
 307         main.style.height = (height / dpr) + "px";
 308         main.style.lineHeight = (height / dpr) + "px";
 309 }
 310
 311 function relayout()
 312 {
 313         var img = display_image_num(global_image_num, "image");
 314         if (can_go_next()) {
 315                 prepare_preload(img, global_image_num + 1);
 316         }
 317
 318         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 319         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 320         set_opacity("close", 0.7);
 321 }
 322
 323 function go_previous()
 324 {
 325         if (!can_go_previous()) {
 326                 return;
 327         }
 328
 329         var img = display_image_num(--global_image_num, "image");
 330         if (can_go_previous()) {
 331                 set_opacity("previous", 0.7);
 332                 prepare_preload(img, global_image_num - 1);
 333         } else {
 334                 set_opacity("previous", 0.1);
 335         }
 336         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 337 }
 338
 339 function go_next()
 340 {
 341         if (!can_go_next()) {
 342                 return;
 343         }
 344
 345         var img = display_image_num(++global_image_num, "image");
 346         if (can_go_next()) {
 347                 set_opacity("next", 0.7);
 348                 prepare_preload(img, global_image_num + 1);
 349         } else {
 350                 set_opacity("next", 0.1);
 351         }
 352         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 353 }
 354
 355 function do_close()
 356 {
 357         window.location = global_return_url;
 358 }
 359
 360 function draw_text(msg)
 361 {
 362         // remove any text we might have left
 363         var text = document.getElementById("text");
 364         if (text !== null) {
 365                 text.parentNode.removeChild(text);
 366         }
 367
 368         text = document.createElement("p");
 369         text.id = "text";
 370         text.style.position = "absolute";
 371         text.style.color = "white";
 372         text.style.lineHeight = "24px";
 373         text.style.font = "24px verdana, arial, sans-serif";
 374         text.innerHTML = msg;
 375
 376         var main = document.getElementById("main");
 377         main.appendChild(text);
 378
 379         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 380         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 381 }
 382
 383 function fade_text(opacity)
 384 {
 385         set_opacity("text", opacity);
 386         if (opacity > 0.0) {
 387                 opacity -= 0.03;
 388                 if (opacity < 0.0) {
 389                         opacity = 0.0;
 390                 }
 391                 setTimeout("fade_text(" + opacity + ")", 30);
 392         } else {
 393                 var text = document.getElementById("text");
 394                 if (text !== null) {
 395                         text.parentNode.removeChild(text);
 396                 }
 397         }
 398 }
 399
 400 function select_image(evt, filename, selected)
 401 {
 402         if (!req) {
 403                 return;
 404         }
 405
 406         if (selected) {
 407                 draw_text("Selecting " + filename + "...");
 408         } else {
 409                 draw_text("Unselecting " + filename + "...");
 410         }
 411
 412         req.open("POST", window.location.origin + "/select", false);
 413         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 414         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
 415
 416         setTimeout("fade_text(0.99)", 30);
 417 }
 418
 419 function key_down(which)
 420 {
 421         if (which == 39) {   // right
 422                 if (can_go_next()) {
 423                         set_opacity("next", 0.99);
 424                 }
 425         } else if (which == 37) {   // left
 426                 if (can_go_previous()) {
 427                         set_opacity("previous", 0.99);
 428                 }
 429         } else if (which == 27) {   // escape
 430                 set_opacity("close", 0.99);
 431         } else {
 432                 check_for_hash_change();
 433         }
 434 }
 435
 436 function key_up(which) {
 437         if (which == 39) {   // right
 438                 if (can_go_next()) {
 439                         set_opacity("next", 0.7);
 440                         go_next();
 441                 }
 442         } else if (which == 37) {   // left
 443                 if (can_go_previous()) {
 444                         set_opacity("previous", 0.7);
 445                         go_previous();
 446                 }
 447         } else if (which == 27) {   // escape
 448                 set_opacity("close", 0.7);
 449                 do_close();
 450         } else if (which == 32 && global_select) {   // space
 451                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
 452         } else if (which == 85 && global_select) {   // u
 453                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
 454         } else {
 455                 check_for_hash_change();
 456         }
 457 }
 458
 459 // enable the horrible horrible IE PNG hack
 460 function ie_png_hack()
 461 {
 462         var vstr = navigator.appVersion.split("MSIE");
 463         var v = parseFloat(vstr[1]);
 464         if (v >= 5.5 && v < 7.0 && document.body.filters) {
 465                 var next = document.getElementById("next");
 466                 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); }\" />";
 467
 468                 var previous = document.getElementById("previous");
 469                 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); }\" />";
 470
 471                 var close = document.getElementById("close");
 472                 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);\" />";
 473         }
 474 }
 475
 476 function parse_image_num(default_value) {
 477         var num = parseInt(window.location.hash.substr(1));
 478         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 479                 return (num - 1);
 480         } else {
 481                 return default_value;
 482         }
 483 }
 484
 485 function check_for_hash_change() {
 486         var num = parse_image_num(-1);
 487         if (num != -1 && num != global_image_num) {
 488                 global_image_num = num;
 489                 relayout();
 490         }
 491 }