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