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