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)
 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 = "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, false);
 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                 img.style.display = 'none';
 137                 setTimeout(function() {
 138                         position_image(img, backend_width, backend_height, offset, false);
 139                         img.style.display = null;
 140                 }, 1);
 141         }
 142 }
 143
 144 function display_infobox(html, backend_width, backend_height, elem_id, offset)
 145 {
 146         // See if this image already exists in the DOM; if not, add it.
 147         var box = document.getElementById(elem_id);
 148         if (box === null) {
 149                 box = document.createElement("div");
 150                 box.id = elem_id;
 151                 box.alt = "";
 152                 box.className = "fsbox";
 153         }
 154         box.style.position = "absolute";
 155         box.style.transformOrigin = "top left";
 156         box.innerHTML = html;
 157         document.getElementById("main").appendChild(box);
 158
 159         if (offset === 0) {
 160                 position_image(box, backend_width, backend_height, offset, true);
 161         } else {
 162                 // This is a preload.
 163                 // Seemingly one needs to delay position_image(), or Firefox will set the initial
 164                 // scroll offset completely off.
 165                 box.style.display = 'none';
 166                 setTimeout(function() {
 167                         position_image(box, backend_width, backend_height, offset, true);
 168                         box.style.display = null;
 169                 }, 1);
 170         }
 171 }
 172
 173 function display_image_num(num, offset)
 174 {
 175         var screen_size = find_width();
 176         var adjusted_size;
 177
 178         if (global_image_list[num][2] == -1) {
 179                 // no size information, use our pessimal guess
 180                 adjusted_size = max_image_size(screen_size);
 181         } else {
 182                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 183         }
 184
 185         var evt = global_image_list[num][0];
 186         var filename = global_image_list[num][1];
 187         var backend_width = adjusted_size[0];
 188         var backend_height = adjusted_size[1];
 189         var url = window.location.origin + "/" + evt + "/" + backend_width + "x" + backend_height + "/" + filename;
 190         var elem_id = num;
 191
 192         display_image(url, adjusted_size[2], adjusted_size[3], elem_id, offset);
 193
 194         if (global_infobox) {
 195                 var elem_id = num + "_box";
 196                 display_infobox(global_image_list[num][4], adjusted_size[2], adjusted_size[3], elem_id, offset);
 197         }
 198
 199         if (offset === 0) {
 200                 // Update the "download original" link.
 201                 var original_url = window.location.origin + "/" + evt + "/original/" + filename;
 202                 document.getElementById("origdownload").href = original_url;
 203
 204                 // If it's a raw image, show a JPEG link.
 205                 var fulldownload = document.getElementById("fulldownload");
 206                 if (filename.match(/\.(nef|cr2)$/i)) {
 207                         fulldownload.style.display = "block";
 208                         var full_url = window.location.origin + "/" + evt + "/" + filename;
 209                         document.getElementById("fulldownloadlink").href = full_url;
 210                         origdownload.innerHTML = "Download original image (RAW)";
 211                 } else {
 212                         fulldownload.style.display = "none";
 213                         origdownload.innerHTML = "Download original image";
 214                 }
 215
 216                 // replace the anchor part (if any) with the image number
 217                 window.location.hash = "#" + (num+1);
 218         }
 219 }
 220
 221 function can_go_next()
 222 {
 223         return (global_image_num < global_image_list.length - 1);
 224 }
 225
 226 function can_go_previous()
 227 {
 228         return (global_image_num > 0);
 229 }
 230
 231 function set_opacity(id, amount)
 232 {
 233         var elem = document.getElementById(id);
 234
 235         // If optionmenu is visible, options is also visible.
 236         if (id === "options" && amount < 0.7) {
 237                 var optionmenu = document.getElementById("optionmenu");
 238                 if (optionmenu.style.display === "block") {
 239                         amount = 0.7;
 240                 }
 241         }
 242         elem.style.opacity = amount;
 243 }
 244
 245 function position_image(img, backend_width, backend_height, offset, box)
 246 {
 247         var screen_size = find_width();
 248         var dpr = find_dpr();
 249         var width, height;
 250
 251         if (backend_width == -1) {
 252                 // no size information, use our pessimal guess
 253                 var adjusted_size = max_image_size(screen_size);
 254                 width = adjusted_size[0];
 255                 height = adjusted_size[1];
 256         } else {
 257                 // use the exact information
 258                 var adjusted_size = pick_image_size(screen_size, [ backend_width, backend_height ]);
 259                 width = adjusted_size[2];
 260                 height = adjusted_size[3];
 261         }
 262
 263         var extra_x_offset = find_width()[0] * offset;
 264         var left = (screen_size[0] - width) / 2;
 265         var top = (screen_size[1] - height) / 2;
 266
 267         if (global_infobox) {
 268                 top = Math.max(top - dpr * (24/2), 0);
 269         }
 270
 271         // center the image on-screen
 272         img.style.position = "absolute";
 273         img.style.left = (left / dpr) + "px";
 274         img.style.transform = "translate(" + extra_x_offset + "px,0px)";
 275
 276         if (box) {
 277                 img.style.top = Math.min(top + height, screen_size[1] - 24) / dpr + "px";
 278                 img.style.width = (width / dpr) + "px";
 279                 img.style.height = "24px";
 280         } else {
 281                 img.style.top = (top / dpr) + "px";
 282                 img.style.lineHeight = (height / dpr) + "px";
 283                 img.style.width = (width / dpr) + "px";
 284                 img.style.height = (height / dpr) + "px";
 285         }
 286 }
 287
 288 function update_shown_images()
 289 {
 290         // Go through and remove all the elements that are not supposed to be there.
 291         var main = document.getElementById("main");
 292         var children = main.children;
 293         var to_remove = [];
 294         for (var i = 0; i < children.length; i++) {
 295                 var child = children[i];
 296                 var inum = null;
 297                 if (child.className === "fsimg") {
 298                         inum = parseInt(child.id);
 299                 } else if (child.className === "fsbox") {
 300                         inum = parseInt(child.id.replace("_box", ""));
 301                 } else {
 302                         continue;
 303                 }
 304
 305                 // FIXME: For whatever reason, if we don't actually remove an item
 306                 // and then scroll it out of view, Chrome scrolls to it.
 307                 // So don't keep anything that's going to be a preload;
 308                 // we'll have to recreate the element entirely.
 309                 //if (inum !== global_image_num - 1 &&
 310                 //    inum !== global_image_num &&
 311                 //    inum !== global_image_num + 1) {
 312                 //      to_remove.push(child);
 313                 //}
 314                 if (inum !== global_image_num) {
 315                         to_remove.push(child);
 316                 }
 317         }
 318         for (let child of to_remove) {
 319                 child.parentNode.removeChild(child);
 320         }
 321
 322         // Add any missing elements. Note that we add the main one first,
 323         // so that the preloads have an element to fire onload off of.
 324         display_image_num(global_image_num, 0);
 325         if (can_go_previous()) {
 326                 display_image_num(global_image_num - 1, -1);
 327         }
 328         if (can_go_next()) {
 329                 display_image_num(global_image_num + 1, 1);
 330         }
 331 }
 332
 333 function relayout()
 334 {
 335         update_shown_images();
 336
 337         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 338         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 339         set_opacity("close", global_default_opacity);
 340         set_opacity("options", global_default_opacity);
 341 }
 342
 343 function go_previous()
 344 {
 345         if (!can_go_previous()) {
 346                 return;
 347         }
 348
 349         --global_image_num;
 350         update_shown_images();
 351         if (can_go_previous()) {
 352                 set_opacity("previous", global_default_opacity);
 353         } else {
 354                 set_opacity("previous", global_disabled_opacity);
 355         }
 356         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 357 }
 358
 359 function go_next()
 360 {
 361         if (!can_go_next()) {
 362                 return;
 363         }
 364
 365         ++global_image_num;
 366         update_shown_images();
 367         if (can_go_next()) {
 368                 set_opacity("next", global_default_opacity);
 369         } else {
 370                 set_opacity("next", global_disabled_opacity);
 371         }
 372         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 373 }
 374
 375 function do_close()
 376 {
 377         if (global_image_num > 0) {
 378                 window.location = global_return_url + '#' + (global_image_num + 1);
 379         } else {
 380                 window.location = global_return_url;
 381         }
 382 }
 383
 384 function toggle_optionmenu()
 385 {
 386         var optionmenu = document.getElementById("optionmenu");
 387         if (optionmenu.style.display === "block") {
 388                 optionmenu.style.display = "none";
 389         } else {
 390                 optionmenu.style.display = "block";
 391                 set_opacity("options", 0.7);
 392         }
 393 }
 394 window['toggle_optionmenu'] = toggle_optionmenu;
 395
 396 function draw_text(msg)
 397 {
 398         // remove any text we might have left
 399         var text = document.getElementById("text");
 400         if (text !== null) {
 401                 text.parentNode.removeChild(text);
 402         }
 403
 404         text = document.createElement("p");
 405         text.id = "text";
 406         text.style.position = "absolute";
 407         text.style.color = "white";
 408         text.style.lineHeight = "24px";
 409         text.style.font = "24px verdana, arial, sans-serif";
 410         text.innerHTML = msg;
 411
 412         document.getElementById("main").appendChild(text);
 413
 414         var screen_size = find_width();
 415         text.style.left = (screen_size[0] - text.clientWidth) / 2 + "px";
 416         text.style.top = (screen_size[1] - text.clientHeight) / 2 + "px";
 417 }
 418
 419 function fade_text(opacity)
 420 {
 421         set_opacity("text", opacity);
 422         if (opacity > 0.0) {
 423                 opacity -= 0.03;
 424                 if (opacity < 0.0) {
 425                         opacity = 0.0;
 426                 }
 427                 setTimeout(function() { fade_text(opacity); }, 30);
 428         } else {
 429                 var text = document.getElementById("text");
 430                 if (text !== null) {
 431                         text.parentNode.removeChild(text);
 432                 }
 433         }
 434 }
 435
 436 function select_image(evt, filename, selected)
 437 {
 438         if (selected) {
 439                 draw_text("Selecting " + filename + "...");
 440         } else {
 441                 draw_text("Unselecting " + filename + "...");
 442         }
 443
 444         var req = new XMLHttpRequest();
 445         req.open("POST", window.location.origin + "/select", true);
 446         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 447         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
 448
 449         setTimeout(function() { fade_text(0.99); }, 30);
 450 }
 451
 452 function key_down(which)
 453 {
 454         if (which == 39) {   // right
 455                 if (can_go_next()) {
 456                         set_opacity("next", global_highlight_opacity);
 457                 }
 458         } else if (which == 37) {   // left
 459                 if (can_go_previous()) {
 460                         set_opacity("previous", global_highlight_opacity);
 461                 }
 462         } else if (which == 27) {   // escape
 463                 set_opacity("close", global_higlight_opacity);
 464         } else {
 465                 check_for_hash_change();
 466         }
 467 }
 468
 469 function key_up(which) {
 470         if (which == 39) {   // right
 471                 if (can_go_next()) {
 472                         set_opacity("next", global_default_opacity);
 473                         go_next();
 474                 }
 475         } else if (which == 37) {   // left
 476                 if (can_go_previous()) {
 477                         set_opacity("previous", global_default_opacity);
 478                         go_previous();
 479                 }
 480         } else if (which == 27) {   // escape
 481                 set_opacity("close", global_default_opacity);
 482                 do_close();
 483         } else if (which == 32 && global_select) {   // space
 484                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
 485         } else if (which == 85 && global_select) {   // u
 486                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
 487         } else {
 488                 check_for_hash_change();
 489         }
 490 }
 491
 492 function parse_image_num(default_value) {
 493         var num = parseInt(window.location.hash.substr(1));
 494         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 495                 return (num - 1);
 496         } else {
 497                 return default_value;
 498         }
 499 }
 500 window['parse_image_num'] = parse_image_num;
 501
 502 function check_for_hash_change() {
 503         var num = parse_image_num(-1);
 504         if (num != -1 && num != global_image_num) {
 505                 global_image_num = num;
 506                 relayout();
 507         }
 508 }
 509
 510 function toggle_immersive() {
 511         if (global_default_opacity == 0.7) {
 512                 global_disabled_opacity = 0.0;
 513                 global_default_opacity = 0.0;
 514                 global_highlight_opacity = 0.2;
 515                 global_infobox = false;
 516                 document.getElementById('immersivetoggle').innerHTML = 'Show decorations';
 517         } else {
 518                 global_disabled_opacity = 0.1;
 519                 global_default_opacity = 0.7;
 520                 global_highlight_opacity = 1.0;
 521                 global_infobox = true;
 522                 document.getElementById('immersivetoggle').innerHTML = 'Hide all decorations';
 523         }
 524         relayout();
 525 }
 526 window['toggle_immersive'] = toggle_immersive;
 527
 528 var swiping = false;
 529 var swipe_start_x = 0;
 530
 531 function set_swipe_pos(x, transition)
 532 {
 533         x = Math.max(x, -window.innerWidth);
 534         x = Math.min(x,  window.innerWidth);
 535         if (!can_go_previous()) {
 536                 x = Math.min(x, window.innerWidth / 8);
 537         }
 538         if (!can_go_next()) {
 539                 x = Math.max(x, -window.innerWidth / 8);
 540         }
 541
 542         var dpr = find_dpr();
 543         var main = document.getElementById("main");
 544         var children = main.children;
 545         var to_remove = [];
 546         for (var i = 0; i < children.length; i++) {
 547                 var child = children[i];
 548                 if (child.className === "fsimg") {
 549                         var inum = parseInt(child.id);
 550                         var offset = inum - global_image_num;
 551                         child.style.transition = transition;
 552                         child.style.transform = "translate(" + (x + find_width()[0] * offset / dpr) + "px,0px)";
 553                 } else if (child.className === "fsbox") {
 554                         var inum = parseInt(child.id.replace("_box", ""));
 555                         var offset = inum - global_image_num;
 556                         child.style.transition = transition;
 557                         child.style.transform = "translate(" + (x + find_width()[0] * offset / dpr) + "px,0px)";
 558                 }
 559         }
 560 }
 561
 562 function start_swipe(e)
 563 {
 564         swiping = true;
 565         swipe_start_x = e.changedTouches[0].pageX;
 566 }
 567
 568 function end_swipe(e)
 569 {
 570         if (swiping) {
 571                 var new_x = (e.changedTouches[0].pageX - swipe_start_x);
 572                 if (new_x < -window.innerWidth / 4 && can_go_next()) {
 573                         set_swipe_pos(-window.innerWidth, "transform 0.1s ease-out");
 574                         setTimeout(function() { go_next(); }, 100);
 575                 } else if (new_x > window.innerWidth / 4 && can_go_previous()) {
 576                         set_swipe_pos(window.innerWidth, "transform 0.1s ease-out");
 577                         setTimeout(function() { go_previous(); }, 100);
 578                 } else {
 579                         set_swipe_pos(0, "transform 0.1s ease-out");
 580                 }
 581                 swiping = false;
 582         }
 583 }
 584
 585 function swipe(e)
 586 {
 587         if (swiping) {
 588                 var new_x = (e.changedTouches[0].pageX - swipe_start_x);
 589                 set_swipe_pos(new_x, null);
 590         }
 591 }
 592
 593 window.onload = function() {
 594         relayout();
 595         setInterval(check_for_hash_change, 1000);
 596
 597         document.addEventListener('touchstart', start_swipe, false);
 598         document.addEventListener('touchend', end_swipe, false);
 599         document.addEventListener('touchmove', swipe, false)
 600
 601         var body = document.body;
 602         body.onresize = function() { relayout(); };
 603         body.onkeydown = function(evt) { key_down(evt.keyCode); };
 604         body.onkeyup = function(evt) { key_up(evt.keyCode); };
 605         body.onhashchange = function() { check_for_hash_change(); };
 606         body.onclick = function() { check_for_hash_change(); };
 607
 608         var previous = document.getElementById('previous');
 609         previous.onmousedown = function() { if (can_go_previous()) { set_opacity('previous', global_highlight_opacity); } };
 610         previous.onmouseup = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); go_previous(); } };
 611         previous.onmouseout = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); } };
 612
 613         var next = document.getElementById('next');
 614         next.onmousedown = function() { if (can_go_next()) { set_opacity('next', global_highlight_opacity); } };
 615         next.onmouseup = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); go_next(); } };
 616         next.onmouseout = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); } };
 617
 618         var close = document.getElementById('close');
 619         close.onmousedown = function() { set_opacity('close', global_highlight_opacity); };
 620         close.onmouseup = function() { set_opacity('close', global_default_opacity); do_close(); };
 621         close.onmouseout = function() { set_opacity('close', global_default_opacity); };
 622
 623         var options = document.getElementById('options');
 624         options.onmousedown = function() { set_opacity('options', global_highlight_opacity); };
 625         options.onmouseup = function() { set_opacity('options', global_default_opacity); toggle_optionmenu(); };
 626         options.onmouseout = function() { set_opacity('options', global_default_opacity); };
 627 };
 628
 629 })();