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

   1 (function() {
   2
   3 var global_disabled_opacity = 0.1;
   4 var global_default_opacity = 0.7;
   5 var global_highlight_opacity = 1.0;
   6 var global_infobox = true;
   7
   8 function find_width()
   9 {
  10         var dpr = find_dpr();
  11         return [window.innerWidth * dpr, window.innerHeight * dpr];
  12 }
  13
  14 function find_dpr()
  15 {
  16         return window.devicePixelRatio || 1;
  17 }
  18
  19 /*
  20  * pr0n can resize to any size we'd like, but we're much more likely
  21  * to have this set of fixed-resolution screens cached, so to increase
  22  * performance, we round down to the closest fit and use that. This
  23  * function is a pessimal estimate of what thumbnail size we can _always_
  24  * fit on the screen -- it's right if and only if all images are 4:3
  25  * (and landscape). If individual size information is available, use
  26  * pick_image_size, below.
  27  */
  28 var fixed_sizes = [
  29         [ 2304, 1728 ],
  30         [ 2048, 1536 ],
  31         [ 1920, 1440 ],
  32         [ 1600, 1200 ],
  33         [ 1400, 1050 ],
  34         [ 1280, 960 ],
  35         [ 1152, 864 ],
  36         [ 1024, 768 ],
  37         [ 800, 600 ],
  38         [ 640, 480 ],
  39         [ 512, 384 ],
  40         [ 320, 256 ],
  41         [ 240, 192 ],
  42         [ 120, 96 ],
  43         [ 80, 64 ]
  44 ];
  45 function max_image_size(screen_size)
  46 {
  47         var i;
  48         for (i = 0; i < fixed_sizes.length; ++i) {
  49                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
  50                         return fixed_sizes[i];
  51                 }
  52         }
  53         return [ 80, 64 ];
  54 }
  55
  56 function pick_image_size(screen_size, image_size)
  57 {
  58         var i;
  59         for (i = 0; i < fixed_sizes.length; ++i) {
  60                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
  61                 // inaccuracies :-)
  62                 var thumbxres = fixed_sizes[i][0];
  63                 var thumbyres = fixed_sizes[i][1];
  64                 var width = image_size[0];
  65                 var height = image_size[1];
  66
  67                 if (!(thumbxres >= width && thumbyres >= height)) {
  68                         var sfh = width / thumbxres;
  69                         var sfv = height / thumbyres;
  70                         if (sfh > sfv) {
  71                                 width  /= sfh;
  72                                 height /= sfh;
  73                         } else {
  74                                 width  /= sfv;
  75                                 height /= sfv;
  76                         }
  77                         width = Math.floor(width);
  78                         height = Math.floor(height);
  79                 }
  80
  81                 if (screen_size[0] >= width && screen_size[1] >= height) {
  82                         // be sure _not_ to return a reference
  83                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
  84                 }
  85         }
  86         return [ 80, 64 ];
  87 }
  88
  89 function replace_image_element(url, element_id, parent_node)
  90 {
  91         var img = document.getElementById(element_id);
  92         if (img !== null) {
  93                 if (img.src === url) {
  94                         return img;
  95                 }
  96                 img.parentNode.removeChild(img);
  97         }
  98
  99         img = document.createElement("img");
 100         img.id = element_id;
 101         img.alt = "";
 102         img.src = url;
 103         parent_node.appendChild(img);
 104         return img;
 105 }
 106
 107 function rename_element(old_name, new_name)
 108 {
 109         // Remove any element that's in the way.
 110         var elem = document.getElementById(new_name);
 111         if (elem !== null) {
 112                 elem.parentNode.removeChild(elem);
 113         }
 114
 115         elem = document.getElementById(old_name);
 116         if (elem !== null) {
 117                 elem.id = new_name;
 118         }
 119         return elem;
 120 }
 121
 122 function display_image(width, height, evt, filename, element_id)
 123 {
 124         var url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/" + filename;
 125         var main = document.getElementById("iehack");
 126         var preload = document.getElementById("preload");
 127         var dpr = find_dpr();
 128         var img;
 129         // See if we have a preload going on that we can reuse.
 130         if (element_id == "image" && preload !== null && preload.src == url) {
 131                 rename_element("preload_box", "image_box");
 132                 img = rename_element("preload", "image");
 133         } else {
 134                 img = replace_image_element(url, element_id, main);
 135         }
 136         img.style.position = "absolute";
 137         img.style.left = "0px";
 138         img.style.top = "0px";
 139         img.style.transformOrigin = "top left";
 140         img.style.transform = "scale(" + (1.0 / dpr) + ")";
 141
 142         if (element_id == "image") {
 143                 // Update the "download original" link.
 144                 var original_url = window.location.origin + "/" + evt + "/original/" + filename;
 145                 document.getElementById("origdownload").href = original_url;
 146         }
 147
 148         if (global_infobox) {
 149                 var url;
 150                 if (dpr == 1) {
 151                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
 152                 } else {
 153                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "@" + dpr.toFixed(2) + "/box/" + filename;
 154                 }
 155                 var boximg = replace_image_element(url, element_id + "_box", main);
 156
 157                 boximg.style.position = "absolute";
 158                 boximg.style.left = "0px";
 159                 boximg.style.bottom = "-1px";
 160                 boximg.style.transformOrigin = "bottom left";
 161                 boximg.style.transform = "scale(" + (1.0 / dpr) + ")";
 162         } else {
 163                 var boximg = document.getElementById(element_id + "_box");
 164                 if (boximg !== null) {
 165                         boximg.parentNode.removeChild(boximg);
 166                 }
 167         }
 168
 169         return img;
 170 }
 171
 172 function display_image_num(num, element_id)
 173 {
 174         var screen_size = find_width();
 175         var adjusted_size;
 176
 177         if (global_image_list[num][2] == -1) {
 178                 // no size information, use our pessimal guess
 179                 adjusted_size = max_image_size(screen_size);
 180         } else {
 181                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 182         }
 183
 184         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 185
 186         if (element_id == "image") {
 187                 // we want to shrink the box as much as possible if we know the true
 188                 // size of the image
 189                 center_image(num);
 190
 191                 // replace the anchor part (if any) with the image number
 192                 window.location.hash = "#" + (num+1);
 193         }
 194
 195         return img;
 196 }
 197
 198 function prepare_preload(img, num)
 199 {
 200         // cancel any pending preload
 201         var preload = document.getElementById("preload");
 202         if (preload !== null) {
 203                 preload.parentNode.removeChild(preload);
 204         }
 205
 206         var preload_box = document.getElementById("preload_box");
 207         if (preload_box !== null) {
 208                 preload_box.parentNode.removeChild(preload_box);
 209         }
 210
 211         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 212         // completeness first; should at least be _somewhat_ better
 213         if (img.complete) {
 214                 display_image_num(num, "preload");
 215         } else {
 216                 img.onload = function() { display_image_num(num, "preload"); };
 217         }
 218 }
 219
 220 function can_go_next()
 221 {
 222         return (global_image_num < global_image_list.length - 1);
 223 }
 224
 225 function can_go_previous()
 226 {
 227         return (global_image_num > 0);
 228 }
 229
 230 function set_opacity(id, amount)
 231 {
 232         var elem = document.getElementById(id);
 233
 234         // If optionmenu is visible, options is also visible.
 235         if (id === "options" && amount < 0.7) {
 236                 var optionmenu = document.getElementById("optionmenu");
 237                 if (optionmenu.style.display === "block") {
 238                         amount = 0.7;
 239                 }
 240         }
 241         elem.style.opacity = amount;
 242 }
 243
 244 function center_image(num)
 245 {
 246         var screen_size = find_width();
 247         var dpr = find_dpr();
 248         var width, height;
 249
 250         if (global_image_list[num][2] == -1) {
 251                 // no size information, use our pessimal guess
 252                 var adjusted_size = max_image_size(screen_size);
 253                 width = adjusted_size[0];
 254                 height = adjusted_size[1];
 255         } else {
 256                 // use the exact information
 257                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 258                 width = adjusted_size[2];
 259                 height = adjusted_size[3];
 260         }
 261
 262         // center the image on-screen
 263         var main = document.getElementById("main");
 264         main.style.position = "absolute";
 265         main.style.left = (((screen_size[0] - width) / 2) / dpr) + "px";
 266         main.style.top = (((screen_size[1] - height) / 2) / dpr) + "px";
 267         main.style.width = (width / dpr) + "px";
 268         main.style.height = (height / dpr) + "px";
 269         main.style.lineHeight = (height / dpr) + "px";
 270 }
 271
 272 function relayout()
 273 {
 274         var img = display_image_num(global_image_num, "image");
 275         if (can_go_next()) {
 276                 prepare_preload(img, global_image_num + 1);
 277         }
 278
 279         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 280         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 281         set_opacity("close", global_default_opacity);
 282         set_opacity("options", global_default_opacity);
 283 }
 284
 285 function go_previous()
 286 {
 287         if (!can_go_previous()) {
 288                 return;
 289         }
 290
 291         var img = display_image_num(--global_image_num, "image");
 292         if (can_go_previous()) {
 293                 set_opacity("previous", global_default_opacity);
 294                 prepare_preload(img, global_image_num - 1);
 295         } else {
 296                 set_opacity("previous", global_disabled_opacity);
 297         }
 298         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 299 }
 300
 301 function go_next()
 302 {
 303         if (!can_go_next()) {
 304                 return;
 305         }
 306
 307         var img = display_image_num(++global_image_num, "image");
 308         if (can_go_next()) {
 309                 set_opacity("next", global_default_opacity);
 310                 prepare_preload(img, global_image_num + 1);
 311         } else {
 312                 set_opacity("next", global_disabled_opacity);
 313         }
 314         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 315 }
 316
 317 function do_close()
 318 {
 319         if (global_image_num > 0) {
 320                 window.location = global_return_url + '#' + (global_image_num + 1);
 321         } else {
 322                 window.location = global_return_url;
 323         }
 324 }
 325
 326 function toggle_optionmenu()
 327 {
 328         var optionmenu = document.getElementById("optionmenu");
 329         if (optionmenu.style.display === "block") {
 330                 optionmenu.style.display = "none";
 331         } else {
 332                 optionmenu.style.display = "block";
 333                 set_opacity("options", 0.7);
 334         }
 335 }
 336 window['toggle_optionmenu'] = toggle_optionmenu;
 337
 338 function draw_text(msg)
 339 {
 340         // remove any text we might have left
 341         var text = document.getElementById("text");
 342         if (text !== null) {
 343                 text.parentNode.removeChild(text);
 344         }
 345
 346         text = document.createElement("p");
 347         text.id = "text";
 348         text.style.position = "absolute";
 349         text.style.color = "white";
 350         text.style.lineHeight = "24px";
 351         text.style.font = "24px verdana, arial, sans-serif";
 352         text.innerHTML = msg;
 353
 354         var main = document.getElementById("main");
 355         main.appendChild(text);
 356
 357         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 358         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 359 }
 360
 361 function fade_text(opacity)
 362 {
 363         set_opacity("text", opacity);
 364         if (opacity > 0.0) {
 365                 opacity -= 0.03;
 366                 if (opacity < 0.0) {
 367                         opacity = 0.0;
 368                 }
 369                 setTimeout("fade_text(" + opacity + ")", 30);
 370         } else {
 371                 var text = document.getElementById("text");
 372                 if (text !== null) {
 373                         text.parentNode.removeChild(text);
 374                 }
 375         }
 376 }
 377
 378 function select_image(evt, filename, selected)
 379 {
 380         if (selected) {
 381                 draw_text("Selecting " + filename + "...");
 382         } else {
 383                 draw_text("Unselecting " + filename + "...");
 384         }
 385
 386         var req = new XMLHttpRequest();
 387         req.open("POST", window.location.origin + "/select", false);
 388         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 389         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
 390
 391         setTimeout("fade_text(0.99)", 30);
 392 }
 393
 394 function key_down(which)
 395 {
 396         if (which == 39) {   // right
 397                 if (can_go_next()) {
 398                         set_opacity("next", global_highlight_opacity);
 399                 }
 400         } else if (which == 37) {   // left
 401                 if (can_go_previous()) {
 402                         set_opacity("previous", global_highlight_opacity);
 403                 }
 404         } else if (which == 27) {   // escape
 405                 set_opacity("close", global_higlight_opacity);
 406         } else {
 407                 check_for_hash_change();
 408         }
 409 }
 410
 411 function key_up(which) {
 412         if (which == 39) {   // right
 413                 if (can_go_next()) {
 414                         set_opacity("next", global_default_opacity);
 415                         go_next();
 416                 }
 417         } else if (which == 37) {   // left
 418                 if (can_go_previous()) {
 419                         set_opacity("previous", global_default_opacity);
 420                         go_previous();
 421                 }
 422         } else if (which == 27) {   // escape
 423                 set_opacity("close", global_default_opacity);
 424                 do_close();
 425         } else if (which == 32 && global_select) {   // space
 426                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
 427         } else if (which == 85 && global_select) {   // u
 428                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
 429         } else {
 430                 check_for_hash_change();
 431         }
 432 }
 433
 434 function parse_image_num(default_value) {
 435         var num = parseInt(window.location.hash.substr(1));
 436         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 437                 return (num - 1);
 438         } else {
 439                 return default_value;
 440         }
 441 }
 442 window['parse_image_num'] = parse_image_num;
 443
 444 function check_for_hash_change() {
 445         var num = parse_image_num(-1);
 446         if (num != -1 && num != global_image_num) {
 447                 global_image_num = num;
 448                 relayout();
 449         }
 450 }
 451
 452 function toggle_immersive() {
 453         if (global_default_opacity == 0.7) {
 454                 global_disabled_opacity = 0.0;
 455                 global_default_opacity = 0.0;
 456                 global_highlight_opacity = 0.2;
 457                 global_infobox = false;
 458                 document.getElementById('immersivetoggle').innerHTML = 'Show decorations';
 459         } else {
 460                 global_disabled_opacity = 0.1;
 461                 global_default_opacity = 0.7;
 462                 global_highlight_opacity = 1.0;
 463                 global_infobox = true;
 464                 document.getElementById('immersivetoggle').innerHTML = 'Hide all decorations';
 465         }
 466         relayout();
 467 }
 468 window['toggle_immersive'] = toggle_immersive;
 469
 470 window.onload = function() {
 471         relayout();
 472         setInterval(check_for_hash_change, 1000);
 473
 474         var body = document.body;
 475         body.onresize = function() { relayout(); };
 476         body.onkeydown = function() { key_down(event.keyCode); };
 477         body.onkeyup = function() { key_up(event.keyCode); };
 478         body.onhashchange = function() { check_for_hash_change(); };
 479         body.onclick = function() { check_for_hash_change(); };
 480
 481         var previous = document.getElementById('previous');
 482         previous.onmousedown = function() { if (can_go_previous()) { set_opacity('previous', global_highlight_opacity); } };
 483         previous.onmouseup = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); go_previous(); } };
 484         previous.onmouseout = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); } };
 485
 486         var next = document.getElementById('next');
 487         next.onmousedown = function() { if (can_go_next()) { set_opacity('next', global_highlight_opacity); } };
 488         next.onmouseup = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); go_next(); } };
 489         next.onmouseout = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); } };
 490
 491         var close = document.getElementById('close');
 492         close.onmousedown = function() { set_opacity('close', global_highlight_opacity); };
 493         close.onmouseup = function() { set_opacity('close', global_default_opacity); do_close(); };
 494         close.onmouseout = function() { set_opacity('close', global_default_opacity); };
 495
 496         var options = document.getElementById('options');
 497         options.onmousedown = function() { set_opacity('options', global_highlight_opacity); };
 498         options.onmouseup = function() { set_opacity('options', global_default_opacity); toggle_optionmenu(); };
 499         options.onmouseout = function() { set_opacity('options', global_default_opacity); };
 500 };
 501
 502 })();