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 rename_element(old_name, new_name)
  93 {
  94         // Remove any element that's in the way.
  95         var elem = document.getElementById(new_name);
  96         if (elem !== null) {
  97                 elem.parentNode.removeChild(elem);
  98         }
  99
 100         elem = document.getElementById(old_name);
 101         if (elem !== null) {
 102                 elem.id = new_name;
 103         }
 104         return elem;
 105 }
 106
 107 function display_image(url, backend_width, backend_height, elem_id, offset, preload)
 108 {
 109         // See if this image already exists in the DOM; if not, add it.
 110         var img = document.getElementById(elem_id);
 111         if (img === null) {
 112                 img = document.createElement("img");
 113                 img.id = elem_id;
 114                 img.alt = "";
 115                 img.className = preload ? "fsbox" : "fsimg";
 116         }
 117         img.style.position = "absolute";
 118         img.style.transformOrigin = "top left";
 119         document.getElementById("main").appendChild(img);
 120
 121         if (offset === 0) {
 122                 img.src = url;
 123                 position_image(img, backend_width, backend_height, offset, preload);
 124         } else {
 125                 // This is a preload, so wait for the main image to be ready.
 126                 // The test for .complete is an old IE hack, which I don't know if is relevant anymore.
 127                 var main_img = document.getElementById(global_image_num);
 128                 if (main_img === null || main_img.complete) {
 129                         img.src = url;
 130                 } else {
 131                         main_img.addEventListener('load', function() { img.src = url; }, false);
 132                 }
 133
 134                 // Seemingly one needs to delay position_image(), or Firefox will set the initial
 135                 // scroll offset completely off.
 136                 setTimeout(function() { position_image(img, backend_width, backend_height, offset, preload); }, 1);
 137         }
 138 }
 139
 140 function display_image_num(num, offset)
 141 {
 142         var screen_size = find_width();
 143         var adjusted_size;
 144
 145         if (global_image_list[num][2] == -1) {
 146                 // no size information, use our pessimal guess
 147                 adjusted_size = max_image_size(screen_size);
 148         } else {
 149                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 150         }
 151
 152         var evt = global_image_list[num][0];
 153         var filename = global_image_list[num][1];
 154         var backend_width = adjusted_size[0];
 155         var backend_height = adjusted_size[1];
 156         var url = window.location.origin + "/" + evt + "/" + backend_width + "x" + backend_height + "/" + filename;
 157         var elem_id = num;
 158
 159         display_image(url, adjusted_size[2], adjusted_size[3], elem_id, offset, false);
 160
 161         if (global_infobox) {
 162                 var url;
 163                 var dpr = find_dpr();
 164                 var elem_id = num + "_box";
 165                 if (dpr == 1) {
 166                         url = window.location.origin + "/" + evt + "/" + backend_width + "x" + backend_height + "/box/" + filename;
 167                 } else {
 168                         url = window.location.origin + "/" + evt + "/" + backend_width + "x" + backend_height + "@" + dpr.toFixed(2) + "/box/" + filename;
 169                 }
 170                 display_image(url, adjusted_size[2], adjusted_size[3], elem_id, offset, true);
 171         }
 172
 173         if (offset === 0) {
 174                 // Update the "download original" link.
 175                 var original_url = window.location.origin + "/" + evt + "/original/" + filename;
 176                 document.getElementById("origdownload").href = original_url;
 177
 178                 // If it's a raw image, show a JPEG link.
 179                 var fulldownload = document.getElementById("fulldownload");
 180                 if (filename.match(/\.(nef|cr2)$/i)) {
 181                         fulldownload.style.display = "block";
 182                         var full_url = window.location.origin + "/" + evt + "/" + filename;
 183                         document.getElementById("fulldownloadlink").href = full_url;
 184                         origdownload.innerHTML = "Download original image (RAW)";
 185                 } else {
 186                         fulldownload.style.display = "none";
 187                         origdownload.innerHTML = "Download original image";
 188                 }
 189
 190                 // replace the anchor part (if any) with the image number
 191                 window.location.hash = "#" + (num+1);
 192         }
 193 }
 194
 195 function can_go_next()
 196 {
 197         return (global_image_num < global_image_list.length - 1);
 198 }
 199
 200 function can_go_previous()
 201 {
 202         return (global_image_num > 0);
 203 }
 204
 205 function set_opacity(id, amount)
 206 {
 207         var elem = document.getElementById(id);
 208
 209         // If optionmenu is visible, options is also visible.
 210         if (id === "options" && amount < 0.7) {
 211                 var optionmenu = document.getElementById("optionmenu");
 212                 if (optionmenu.style.display === "block") {
 213                         amount = 0.7;
 214                 }
 215         }
 216         elem.style.opacity = amount;
 217 }
 218
 219 function position_image(img, backend_width, backend_height, offset, preload)
 220 {
 221         var screen_size = find_width();
 222         var dpr = find_dpr();
 223         var width, height;
 224
 225         if (backend_width == -1) {
 226                 // no size information, use our pessimal guess
 227                 var adjusted_size = max_image_size(screen_size);
 228                 width = adjusted_size[0];
 229                 height = adjusted_size[1];
 230         } else {
 231                 // use the exact information
 232                 var adjusted_size = pick_image_size(screen_size, [ backend_width, backend_height ]);
 233                 width = adjusted_size[2];
 234                 height = adjusted_size[3];
 235         }
 236
 237         var extra_x_offset = find_width()[0] * offset;
 238         var left = (screen_size[0] - width) / 2;
 239         var top = (screen_size[1] - height) / 2;
 240
 241         if (global_infobox) top -= dpr * (24/2);
 242
 243         // center the image on-screen
 244         img.style.position = "absolute";
 245         img.style.left = (left / dpr) + "px";
 246         img.style.transform = "translate(" + extra_x_offset + "px,0px)";
 247
 248         if (preload) {
 249                 img.style.top = (top + height) / dpr + "px";
 250         } else {
 251                 img.style.top = (top / dpr) + "px";
 252                 img.style.lineHeight = (height / dpr) + "px";
 253                 img.style.width = (width / dpr) + "px";
 254                 img.style.height = (height / dpr) + "px";
 255         }
 256 }
 257
 258 function update_shown_images()
 259 {
 260         // Go through and remove all the elements that are not supposed to be there.
 261         var main = document.getElementById("main");
 262         var children = main.children;
 263         var to_remove = [];
 264         for (var i = 0; i < children.length; i++) {
 265                 var child = children[i];
 266                 var inum = null;
 267                 if (child.className === "fsimg") {
 268                         inum = parseInt(child.id);
 269                 } else if (child.className === "fsbox") {
 270                         inum = parseInt(child.id.replace("_box", ""));
 271                 } else {
 272                         continue;
 273                 }
 274
 275                 // FIXME: For whatever reason, if we don't actually remove an item
 276                 // and then scroll it out of view, Chrome scrolls to it.
 277                 // So don't keep anything that's going to be a preload;
 278                 // we'll have to recreate the element entirely.
 279                 //if (inum !== global_image_num - 1 &&
 280                 //    inum !== global_image_num &&
 281                 //    inum !== global_image_num + 1) {
 282                 //      to_remove.push(child);
 283                 //}
 284                 if (inum !== global_image_num) {
 285                         to_remove.push(child);
 286                 }
 287         }
 288         for (let child of to_remove) {
 289                 child.parentNode.removeChild(child);
 290         }
 291
 292         // Add any missing elements. Note that we add the main one first,
 293         // so that the preloads have an element to fire onload off of.
 294         display_image_num(global_image_num, 0);
 295         if (can_go_previous()) {
 296                 display_image_num(global_image_num - 1, -1);
 297         }
 298         if (can_go_next()) {
 299                 display_image_num(global_image_num + 1, 1);
 300         }
 301 }
 302
 303 function relayout()
 304 {
 305         update_shown_images();
 306
 307         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 308         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 309         set_opacity("close", global_default_opacity);
 310         set_opacity("options", global_default_opacity);
 311 }
 312
 313 function go_previous()
 314 {
 315         if (!can_go_previous()) {
 316                 return;
 317         }
 318
 319         --global_image_num;
 320         update_shown_images();
 321         if (can_go_previous()) {
 322                 set_opacity("previous", global_default_opacity);
 323         } else {
 324                 set_opacity("previous", global_disabled_opacity);
 325         }
 326         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 327 }
 328
 329 function go_next()
 330 {
 331         if (!can_go_next()) {
 332                 return;
 333         }
 334
 335         ++global_image_num;
 336         update_shown_images();
 337         if (can_go_next()) {
 338                 set_opacity("next", global_default_opacity);
 339         } else {
 340                 set_opacity("next", global_disabled_opacity);
 341         }
 342         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 343 }
 344
 345 function do_close()
 346 {
 347         if (global_image_num > 0) {
 348                 window.location = global_return_url + '#' + (global_image_num + 1);
 349         } else {
 350                 window.location = global_return_url;
 351         }
 352 }
 353
 354 function toggle_optionmenu()
 355 {
 356         var optionmenu = document.getElementById("optionmenu");
 357         if (optionmenu.style.display === "block") {
 358                 optionmenu.style.display = "none";
 359         } else {
 360                 optionmenu.style.display = "block";
 361                 set_opacity("options", 0.7);
 362         }
 363 }
 364 window['toggle_optionmenu'] = toggle_optionmenu;
 365
 366 function draw_text(msg)
 367 {
 368         // remove any text we might have left
 369         var text = document.getElementById("text");
 370         if (text !== null) {
 371                 text.parentNode.removeChild(text);
 372         }
 373
 374         text = document.createElement("p");
 375         text.id = "text";
 376         text.style.position = "absolute";
 377         text.style.color = "white";
 378         text.style.lineHeight = "24px";
 379         text.style.font = "24px verdana, arial, sans-serif";
 380         text.innerHTML = msg;
 381
 382         var main = document.getElementById("main");
 383         main.appendChild(text);
 384
 385         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 386         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 387 }
 388
 389 function fade_text(opacity)
 390 {
 391         set_opacity("text", opacity);
 392         if (opacity > 0.0) {
 393                 opacity -= 0.03;
 394                 if (opacity < 0.0) {
 395                         opacity = 0.0;
 396                 }
 397                 setTimeout(function() { fade_text(opacity); }, 30);
 398         } else {
 399                 var text = document.getElementById("text");
 400                 if (text !== null) {
 401                         text.parentNode.removeChild(text);
 402                 }
 403         }
 404 }
 405
 406 function select_image(evt, filename, selected)
 407 {
 408         if (selected) {
 409                 draw_text("Selecting " + filename + "...");
 410         } else {
 411                 draw_text("Unselecting " + filename + "...");
 412         }
 413
 414         var req = new XMLHttpRequest();
 415         req.open("POST", window.location.origin + "/select", false);
 416         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 417         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
 418
 419         setTimeout(function() { fade_text(0.99); }, 30);
 420 }
 421
 422 function key_down(which)
 423 {
 424         if (which == 39) {   // right
 425                 if (can_go_next()) {
 426                         set_opacity("next", global_highlight_opacity);
 427                 }
 428         } else if (which == 37) {   // left
 429                 if (can_go_previous()) {
 430                         set_opacity("previous", global_highlight_opacity);
 431                 }
 432         } else if (which == 27) {   // escape
 433                 set_opacity("close", global_higlight_opacity);
 434         } else {
 435                 check_for_hash_change();
 436         }
 437 }
 438
 439 function key_up(which) {
 440         if (which == 39) {   // right
 441                 if (can_go_next()) {
 442                         set_opacity("next", global_default_opacity);
 443                         go_next();
 444                 }
 445         } else if (which == 37) {   // left
 446                 if (can_go_previous()) {
 447                         set_opacity("previous", global_default_opacity);
 448                         go_previous();
 449                 }
 450         } else if (which == 27) {   // escape
 451                 set_opacity("close", global_default_opacity);
 452                 do_close();
 453         } else if (which == 32 && global_select) {   // space
 454                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
 455         } else if (which == 85 && global_select) {   // u
 456                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
 457         } else {
 458                 check_for_hash_change();
 459         }
 460 }
 461
 462 function parse_image_num(default_value) {
 463         var num = parseInt(window.location.hash.substr(1));
 464         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 465                 return (num - 1);
 466         } else {
 467                 return default_value;
 468         }
 469 }
 470 window['parse_image_num'] = parse_image_num;
 471
 472 function check_for_hash_change() {
 473         var num = parse_image_num(-1);
 474         if (num != -1 && num != global_image_num) {
 475                 global_image_num = num;
 476                 relayout();
 477         }
 478 }
 479
 480 function toggle_immersive() {
 481         if (global_default_opacity == 0.7) {
 482                 global_disabled_opacity = 0.0;
 483                 global_default_opacity = 0.0;
 484                 global_highlight_opacity = 0.2;
 485                 global_infobox = false;
 486                 document.getElementById('immersivetoggle').innerHTML = 'Show decorations';
 487         } else {
 488                 global_disabled_opacity = 0.1;
 489                 global_default_opacity = 0.7;
 490                 global_highlight_opacity = 1.0;
 491                 global_infobox = true;
 492                 document.getElementById('immersivetoggle').innerHTML = 'Hide all decorations';
 493         }
 494         relayout();
 495 }
 496 window['toggle_immersive'] = toggle_immersive;
 497
 498 window.onload = function() {
 499         relayout();
 500         setInterval(check_for_hash_change, 1000);
 501
 502         var body = document.body;
 503         body.onresize = function() { relayout(); };
 504         body.onkeydown = function(evt) { key_down(evt.keyCode); };
 505         body.onkeyup = function(evt) { key_up(evt.keyCode); };
 506         body.onhashchange = function() { check_for_hash_change(); };
 507         body.onclick = function() { check_for_hash_change(); };
 508
 509         var previous = document.getElementById('previous');
 510         previous.onmousedown = function() { if (can_go_previous()) { set_opacity('previous', global_highlight_opacity); } };
 511         previous.onmouseup = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); go_previous(); } };
 512         previous.onmouseout = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); } };
 513
 514         var next = document.getElementById('next');
 515         next.onmousedown = function() { if (can_go_next()) { set_opacity('next', global_highlight_opacity); } };
 516         next.onmouseup = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); go_next(); } };
 517         next.onmouseout = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); } };
 518
 519         var close = document.getElementById('close');
 520         close.onmousedown = function() { set_opacity('close', global_highlight_opacity); };
 521         close.onmouseup = function() { set_opacity('close', global_default_opacity); do_close(); };
 522         close.onmouseout = function() { set_opacity('close', global_default_opacity); };
 523
 524         var options = document.getElementById('options');
 525         options.onmousedown = function() { set_opacity('options', global_highlight_opacity); };
 526         options.onmouseup = function() { set_opacity('options', global_default_opacity); toggle_optionmenu(); };
 527         options.onmouseout = function() { set_opacity('options', global_default_opacity); };
 528 };
 529
 530 })();