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         [ 3840, 2880 ],
  30         [ 3200, 2400 ],
  31         [ 2800, 2100 ],
  32         [ 2304, 1728 ],
  33         [ 2048, 1536 ],
  34         [ 1920, 1440 ],
  35         [ 1600, 1200 ],
  36         [ 1400, 1050 ],
  37         [ 1280, 960 ],
  38         [ 1152, 864 ],
  39         [ 1024, 768 ],
  40         [ 800, 600 ],
  41         [ 640, 480 ],
  42         [ 512, 384 ],
  43         [ 320, 256 ],
  44         [ 240, 192 ],
  45         [ 120, 96 ],
  46         [ 80, 64 ]
  47 ];
  48 function max_image_size(screen_size)
  49 {
  50         var i;
  51         for (i = 0; i < fixed_sizes.length; ++i) {
  52                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
  53                         return fixed_sizes[i];
  54                 }
  55         }
  56         return [ 80, 64 ];
  57 }
  58
  59 function pick_image_size(screen_size, image_size)
  60 {
  61         var i;
  62         for (i = 0; i < fixed_sizes.length; ++i) {
  63                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
  64                 // inaccuracies :-)
  65                 var thumbxres = fixed_sizes[i][0];
  66                 var thumbyres = fixed_sizes[i][1];
  67                 var width = image_size[0];
  68                 var height = image_size[1];
  69
  70                 if (!(thumbxres >= width && thumbyres >= height)) {
  71                         var sfh = width / thumbxres;
  72                         var sfv = height / thumbyres;
  73                         if (sfh > sfv) {
  74                                 width  /= sfh;
  75                                 height /= sfh;
  76                         } else {
  77                                 width  /= sfv;
  78                                 height /= sfv;
  79                         }
  80                         width = Math.floor(width);
  81                         height = Math.floor(height);
  82                 }
  83
  84                 if (screen_size[0] >= width && screen_size[1] >= height) {
  85                         // be sure _not_ to return a reference
  86                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
  87                 }
  88         }
  89         return [ 80, 64 ];
  90 }
  91
  92 function replace_image_element(url, element_id, parent_node)
  93 {
  94         var img = document.getElementById(element_id);
  95         if (img !== null) {
  96                 if (img.src === url) {
  97                         return img;
  98                 }
  99                 img.parentNode.removeChild(img);
 100         }
 101
 102         img = document.createElement("img");
 103         img.id = element_id;
 104         img.alt = "";
 105         img.src = url;
 106         parent_node.appendChild(img);
 107         return img;
 108 }
 109
 110 function rename_element(old_name, new_name)
 111 {
 112         // Remove any element that's in the way.
 113         var elem = document.getElementById(new_name);
 114         if (elem !== null) {
 115                 elem.parentNode.removeChild(elem);
 116         }
 117
 118         elem = document.getElementById(old_name);
 119         if (elem !== null) {
 120                 elem.id = new_name;
 121         }
 122         return elem;
 123 }
 124
 125 function display_image(width, height, evt, filename, element_id)
 126 {
 127         var url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/" + filename;
 128         var main = document.getElementById("main");
 129         var preload = document.getElementById("preload");
 130         var dpr = find_dpr();
 131         var img;
 132         // See if we have a preload going on that we can reuse.
 133         if (element_id == "image" && preload !== null && preload.src == url) {
 134                 rename_element("preload_box", "image_box");
 135                 img = rename_element("preload", "image");
 136         } else {
 137                 img = replace_image_element(url, element_id, main);
 138         }
 139         img.style.position = "absolute";
 140         img.style.left = "0px";
 141         img.style.top = "0px";
 142         img.style.transformOrigin = "top left";
 143         img.style.transform = "scale(" + (1.0 / dpr) + ")";
 144
 145         if (element_id == "image") {
 146                 // Update the "download original" link.
 147                 var original_url = window.location.origin + "/" + evt + "/original/" + filename;
 148                 document.getElementById("origdownload").href = original_url;
 149
 150                 // If it's a raw image, show a JPEG link.
 151                 var fulldownload = document.getElementById("fulldownload");
 152                 if (filename.match(/\.(nef|cr2)$/i)) {
 153                         fulldownload.style.display = "block";
 154                         var full_url = window.location.origin + "/" + evt + "/" + filename;
 155                         document.getElementById("fulldownloadlink").href = full_url;
 156                         origdownload.innerHTML = "Download original image (RAW)";
 157                 } else {
 158                         fulldownload.style.display = "none";
 159                         origdownload.innerHTML = "Download original image";
 160                 }
 161         }
 162
 163         if (global_infobox) {
 164                 var url;
 165                 if (dpr == 1) {
 166                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
 167                 } else {
 168                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "@" + dpr.toFixed(2) + "/box/" + filename;
 169                 }
 170                 var boximg = replace_image_element(url, element_id + "_box", main);
 171
 172                 boximg.style.position = "absolute";
 173                 boximg.style.left = "0px";
 174                 boximg.style.bottom = "-1px";
 175                 boximg.style.transformOrigin = "bottom left";
 176                 boximg.style.transform = "scale(" + (1.0 / dpr) + ")";
 177         } else {
 178                 var boximg = document.getElementById(element_id + "_box");
 179                 if (boximg !== null) {
 180                         boximg.parentNode.removeChild(boximg);
 181                 }
 182         }
 183
 184         return img;
 185 }
 186
 187 function display_image_num(num, element_id)
 188 {
 189         var screen_size = find_width();
 190         var adjusted_size;
 191
 192         if (global_image_list[num][2] == -1) {
 193                 // no size information, use our pessimal guess
 194                 adjusted_size = max_image_size(screen_size);
 195         } else {
 196                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 197         }
 198
 199         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 200
 201         if (element_id == "image") {
 202                 // we want to shrink the box as much as possible if we know the true
 203                 // size of the image
 204                 center_image(num);
 205
 206                 // replace the anchor part (if any) with the image number
 207                 window.location.hash = "#" + (num+1);
 208         }
 209
 210         return img;
 211 }
 212
 213 function prepare_preload(img, num)
 214 {
 215         // cancel any pending preload
 216         var preload = document.getElementById("preload");
 217         if (preload !== null) {
 218                 preload.parentNode.removeChild(preload);
 219         }
 220
 221         var preload_box = document.getElementById("preload_box");
 222         if (preload_box !== null) {
 223                 preload_box.parentNode.removeChild(preload_box);
 224         }
 225
 226         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 227         // completeness first; should at least be _somewhat_ better
 228         if (img.complete) {
 229                 display_image_num(num, "preload");
 230         } else {
 231                 img.onload = function() { display_image_num(num, "preload"); };
 232         }
 233 }
 234
 235 function can_go_next()
 236 {
 237         return (global_image_num < global_image_list.length - 1);
 238 }
 239
 240 function can_go_previous()
 241 {
 242         return (global_image_num > 0);
 243 }
 244
 245 function set_opacity(id, amount)
 246 {
 247         var elem = document.getElementById(id);
 248
 249         // If optionmenu is visible, options is also visible.
 250         if (id === "options" && amount < 0.7) {
 251                 var optionmenu = document.getElementById("optionmenu");
 252                 if (optionmenu.style.display === "block") {
 253                         amount = 0.7;
 254                 }
 255         }
 256         elem.style.opacity = amount;
 257 }
 258
 259 function center_image(num)
 260 {
 261         var screen_size = find_width();
 262         var dpr = find_dpr();
 263         var width, height;
 264
 265         if (global_image_list[num][2] == -1) {
 266                 // no size information, use our pessimal guess
 267                 var adjusted_size = max_image_size(screen_size);
 268                 width = adjusted_size[0];
 269                 height = adjusted_size[1];
 270         } else {
 271                 // use the exact information
 272                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 273                 width = adjusted_size[2];
 274                 height = adjusted_size[3];
 275         }
 276
 277         // center the image on-screen
 278         var main = document.getElementById("main");
 279         main.style.position = "absolute";
 280         main.style.left = (((screen_size[0] - width) / 2) / dpr) + "px";
 281         main.style.top = (((screen_size[1] - height) / 2) / dpr) + "px";
 282         main.style.width = (width / dpr) + "px";
 283         main.style.height = (height / dpr) + "px";
 284         main.style.lineHeight = (height / dpr) + "px";
 285 }
 286
 287 function relayout()
 288 {
 289         var img = display_image_num(global_image_num, "image");
 290         if (can_go_next()) {
 291                 prepare_preload(img, global_image_num + 1);
 292         }
 293
 294         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 295         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 296         set_opacity("close", global_default_opacity);
 297         set_opacity("options", global_default_opacity);
 298 }
 299
 300 function go_previous()
 301 {
 302         if (!can_go_previous()) {
 303                 return;
 304         }
 305
 306         var img = display_image_num(--global_image_num, "image");
 307         if (can_go_previous()) {
 308                 set_opacity("previous", global_default_opacity);
 309                 prepare_preload(img, global_image_num - 1);
 310         } else {
 311                 set_opacity("previous", global_disabled_opacity);
 312         }
 313         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 314 }
 315
 316 function go_next()
 317 {
 318         if (!can_go_next()) {
 319                 return;
 320         }
 321
 322         var img = display_image_num(++global_image_num, "image");
 323         if (can_go_next()) {
 324                 set_opacity("next", global_default_opacity);
 325                 prepare_preload(img, global_image_num + 1);
 326         } else {
 327                 set_opacity("next", global_disabled_opacity);
 328         }
 329         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 330 }
 331
 332 function do_close()
 333 {
 334         if (global_image_num > 0) {
 335                 window.location = global_return_url + '#' + (global_image_num + 1);
 336         } else {
 337                 window.location = global_return_url;
 338         }
 339 }
 340
 341 function toggle_optionmenu()
 342 {
 343         var optionmenu = document.getElementById("optionmenu");
 344         if (optionmenu.style.display === "block") {
 345                 optionmenu.style.display = "none";
 346         } else {
 347                 optionmenu.style.display = "block";
 348                 set_opacity("options", 0.7);
 349         }
 350 }
 351 window['toggle_optionmenu'] = toggle_optionmenu;
 352
 353 function draw_text(msg)
 354 {
 355         // remove any text we might have left
 356         var text = document.getElementById("text");
 357         if (text !== null) {
 358                 text.parentNode.removeChild(text);
 359         }
 360
 361         text = document.createElement("p");
 362         text.id = "text";
 363         text.style.position = "absolute";
 364         text.style.color = "white";
 365         text.style.lineHeight = "24px";
 366         text.style.font = "24px verdana, arial, sans-serif";
 367         text.innerHTML = msg;
 368
 369         var main = document.getElementById("main");
 370         main.appendChild(text);
 371
 372         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 373         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 374 }
 375
 376 function fade_text(opacity)
 377 {
 378         set_opacity("text", opacity);
 379         if (opacity > 0.0) {
 380                 opacity -= 0.03;
 381                 if (opacity < 0.0) {
 382                         opacity = 0.0;
 383                 }
 384                 setTimeout(function() { fade_text(opacity); }, 30);
 385         } else {
 386                 var text = document.getElementById("text");
 387                 if (text !== null) {
 388                         text.parentNode.removeChild(text);
 389                 }
 390         }
 391 }
 392
 393 function select_image(evt, filename, selected)
 394 {
 395         if (selected) {
 396                 draw_text("Selecting " + filename + "...");
 397         } else {
 398                 draw_text("Unselecting " + filename + "...");
 399         }
 400
 401         var req = new XMLHttpRequest();
 402         req.open("POST", window.location.origin + "/select", false);
 403         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 404         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
 405
 406         setTimeout(function() { fade_text(0.99); }, 30);
 407 }
 408
 409 function key_down(which)
 410 {
 411         if (which == 39) {   // right
 412                 if (can_go_next()) {
 413                         set_opacity("next", global_highlight_opacity);
 414                 }
 415         } else if (which == 37) {   // left
 416                 if (can_go_previous()) {
 417                         set_opacity("previous", global_highlight_opacity);
 418                 }
 419         } else if (which == 27) {   // escape
 420                 set_opacity("close", global_higlight_opacity);
 421         } else {
 422                 check_for_hash_change();
 423         }
 424 }
 425
 426 function key_up(which) {
 427         if (which == 39) {   // right
 428                 if (can_go_next()) {
 429                         set_opacity("next", global_default_opacity);
 430                         go_next();
 431                 }
 432         } else if (which == 37) {   // left
 433                 if (can_go_previous()) {
 434                         set_opacity("previous", global_default_opacity);
 435                         go_previous();
 436                 }
 437         } else if (which == 27) {   // escape
 438                 set_opacity("close", global_default_opacity);
 439                 do_close();
 440         } else if (which == 32 && global_select) {   // space
 441                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
 442         } else if (which == 85 && global_select) {   // u
 443                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
 444         } else {
 445                 check_for_hash_change();
 446         }
 447 }
 448
 449 function parse_image_num(default_value) {
 450         var num = parseInt(window.location.hash.substr(1));
 451         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 452                 return (num - 1);
 453         } else {
 454                 return default_value;
 455         }
 456 }
 457 window['parse_image_num'] = parse_image_num;
 458
 459 function check_for_hash_change() {
 460         var num = parse_image_num(-1);
 461         if (num != -1 && num != global_image_num) {
 462                 global_image_num = num;
 463                 relayout();
 464         }
 465 }
 466
 467 function toggle_immersive() {
 468         if (global_default_opacity == 0.7) {
 469                 global_disabled_opacity = 0.0;
 470                 global_default_opacity = 0.0;
 471                 global_highlight_opacity = 0.2;
 472                 global_infobox = false;
 473                 document.getElementById('immersivetoggle').innerHTML = 'Show decorations';
 474         } else {
 475                 global_disabled_opacity = 0.1;
 476                 global_default_opacity = 0.7;
 477                 global_highlight_opacity = 1.0;
 478                 global_infobox = true;
 479                 document.getElementById('immersivetoggle').innerHTML = 'Hide all decorations';
 480         }
 481         relayout();
 482 }
 483 window['toggle_immersive'] = toggle_immersive;
 484
 485 window.onload = function() {
 486         relayout();
 487         setInterval(check_for_hash_change, 1000);
 488
 489         var body = document.body;
 490         body.onresize = function() { relayout(); };
 491         body.onkeydown = function(evt) { key_down(evt.keyCode); };
 492         body.onkeyup = function(evt) { key_up(evt.keyCode); };
 493         body.onhashchange = function() { check_for_hash_change(); };
 494         body.onclick = function() { check_for_hash_change(); };
 495
 496         var previous = document.getElementById('previous');
 497         previous.onmousedown = function() { if (can_go_previous()) { set_opacity('previous', global_highlight_opacity); } };
 498         previous.onmouseup = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); go_previous(); } };
 499         previous.onmouseout = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); } };
 500
 501         var next = document.getElementById('next');
 502         next.onmousedown = function() { if (can_go_next()) { set_opacity('next', global_highlight_opacity); } };
 503         next.onmouseup = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); go_next(); } };
 504         next.onmouseout = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); } };
 505
 506         var close = document.getElementById('close');
 507         close.onmousedown = function() { set_opacity('close', global_highlight_opacity); };
 508         close.onmouseup = function() { set_opacity('close', global_default_opacity); do_close(); };
 509         close.onmouseout = function() { set_opacity('close', global_default_opacity); };
 510
 511         var options = document.getElementById('options');
 512         options.onmousedown = function() { set_opacity('options', global_highlight_opacity); };
 513         options.onmouseup = function() { set_opacity('options', global_default_opacity); toggle_optionmenu(); };
 514         options.onmouseout = function() { set_opacity('options', global_default_opacity); };
 515 };
 516
 517 })();