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