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