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