git.sesse.net Git - pr0n/blob - files/pr0n-fullscreen.js

   1 function find_width()
   2 {
   3         var dpr = find_dpr();
   4         return [window.innerWidth * dpr, window.innerHeight * dpr];
   5 }
   6
   7 function find_dpr()
   8 {
   9         return window.devicePixelRatio || 1;
  10 }
  11
  12 /*
  13  * pr0n can resize to any size we'd like, but we're much more likely
  14  * to have this set of fixed-resolution screens cached, so to increase
  15  * performance, we round down to the closest fit and use that. This
  16  * function is a pessimal estimate of what thumbnail size we can _always_
  17  * fit on the screen -- it's right if and only if all images are 4:3
  18  * (and landscape). If individual size information is available, use
  19  * pick_image_size, below.
  20  */
  21 var fixed_sizes = [
  22         [ 2304, 1728 ],
  23         [ 2048, 1536 ],
  24         [ 1920, 1440 ],
  25         [ 1600, 1200 ],
  26         [ 1400, 1050 ],
  27         [ 1280, 960 ],
  28         [ 1152, 864 ],
  29         [ 1024, 768 ],
  30         [ 800, 600 ],
  31         [ 640, 480 ],
  32         [ 512, 384 ],
  33         [ 320, 256 ],
  34         [ 240, 192 ],
  35         [ 120, 96 ],
  36         [ 80, 64 ]
  37 ];
  38 function max_image_size(screen_size)
  39 {
  40         var i;
  41         for (i = 0; i < fixed_sizes.length; ++i) {
  42                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
  43                         return fixed_sizes[i];
  44                 }
  45         }
  46         return [ 80, 64 ];
  47 }
  48
  49 function pick_image_size(screen_size, image_size)
  50 {
  51         var i;
  52         for (i = 0; i < fixed_sizes.length; ++i) {
  53                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
  54                 // inaccuracies :-)
  55                 var thumbxres = fixed_sizes[i][0];
  56                 var thumbyres = fixed_sizes[i][1];
  57                 var width = image_size[0];
  58                 var height = image_size[1];
  59
  60                 if (!(thumbxres >= width && thumbyres >= height)) {
  61                         var sfh = width / thumbxres;
  62                         var sfv = height / thumbyres;
  63                         if (sfh > sfv) {
  64                                 width  /= sfh;
  65                                 height /= sfh;
  66                         } else {
  67                                 width  /= sfv;
  68                                 height /= sfv;
  69                         }
  70                         width = Math.floor(width);
  71                         height = Math.floor(height);
  72                 }
  73
  74                 if (screen_size[0] >= width && screen_size[1] >= height) {
  75                         // be sure _not_ to return a reference
  76                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
  77                 }
  78         }
  79         return [ 80, 64 ];
  80 }
  81
  82 function replace_image_element(url, element_id, parent_node)
  83 {
  84         var img = document.getElementById(element_id);
  85         if (img !== null) {
  86                 if (img.src === url) {
  87                         return img;
  88                 }
  89                 img.parentNode.removeChild(img);
  90         }
  91
  92         img = document.createElement("img");
  93         img.id = element_id;
  94         img.alt = "";
  95         img.src = url;
  96         parent_node.appendChild(img);
  97         return img;
  98 }
  99
 100 function rename_element(old_name, new_name)
 101 {
 102         // Remove any element that's in the way.
 103         var elem = document.getElementById(new_name);
 104         if (elem !== null) {
 105                 elem.parentNode.removeChild(elem);
 106         }
 107
 108         elem = document.getElementById(old_name);
 109         if (elem !== null) {
 110                 elem.id = new_name;
 111         }
 112         return elem;
 113 }
 114
 115 function display_image(width, height, evt, filename, element_id)
 116 {
 117         var url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/" + filename;
 118         var main = document.getElementById("iehack");
 119         var preload = document.getElementById("preload");
 120         var dpr = find_dpr();
 121         var img;
 122         // See if we have a preload going on that we can reuse.
 123         if (element_id == "image" && preload !== null && preload.src == url) {
 124                 rename_element("preload_box", "image_box");
 125                 img = rename_element("preload", "image");
 126         } else {
 127                 img = replace_image_element(url, element_id, main);
 128         }
 129         img.style.position = "absolute";
 130         img.style.left = "0px";
 131         img.style.top = "0px";
 132         img.style.transformOrigin = "top left";
 133         img.style.transform = "scale(" + (1.0 / dpr) + ")";
 134
 135         // Update the "download original" link.
 136         var original_url = window.location.origin + "/" + evt + "/original/" + filename;
 137         document.getElementById("origdownload").href = original_url;
 138
 139         if (global_infobox) {
 140                 var url;
 141                 if (dpr == 1) {
 142                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
 143                 } else {
 144                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "@" + dpr.toFixed(2) + "/box/" + filename;
 145                 }
 146                 var boximg = replace_image_element(url, element_id + "_box", main);
 147
 148                 boximg.style.position = "absolute";
 149                 boximg.style.left = "0px";
 150                 boximg.style.bottom = "-1px";
 151                 boximg.style.transformOrigin = "bottom left";
 152                 boximg.style.transform = "scale(" + (1.0 / dpr) + ")";
 153         } else {
 154                 var boximg = document.getElementById(element_id + "_box");
 155                 if (boximg !== null) {
 156                         boximg.parentNode.removeChild(boximg);
 157                 }
 158         }
 159
 160         return img;
 161 }
 162
 163 function display_image_num(num, element_id)
 164 {
 165         var screen_size = find_width();
 166         var adjusted_size;
 167
 168         if (global_image_list[num][2] == -1) {
 169                 // no size information, use our pessimal guess
 170                 adjusted_size = max_image_size(screen_size);
 171         } else {
 172                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 173         }
 174
 175         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 176
 177         if (element_id == "image") {
 178                 // we want to shrink the box as much as possible if we know the true
 179                 // size of the image
 180                 center_image(num);
 181
 182                 // replace the anchor part (if any) with the image number
 183                 window.location.hash = "#" + (num+1);
 184         }
 185
 186         return img;
 187 }
 188
 189 function prepare_preload(img, num)
 190 {
 191         // cancel any pending preload
 192         var preload = document.getElementById("preload");
 193         if (preload !== null) {
 194                 preload.parentNode.removeChild(preload);
 195         }
 196
 197         var preload_box = document.getElementById("preload_box");
 198         if (preload_box !== null) {
 199                 preload_box.parentNode.removeChild(preload_box);
 200         }
 201
 202         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 203         // completeness first; should at least be _somewhat_ better
 204         if (img.complete) {
 205                 display_image_num(num, "preload");
 206         } else {
 207                 img.onload = function() { display_image_num(num, "preload"); };
 208         }
 209 }
 210
 211 function can_go_next()
 212 {
 213         return (global_image_num < global_image_list.length - 1);
 214 }
 215
 216 function can_go_previous()
 217 {
 218         return (global_image_num > 0);
 219 }
 220
 221 function set_opacity(id, amount)
 222 {
 223         var elem = document.getElementById(id);
 224
 225         // If optionmenu is visible, options is also visible.
 226         if (id === "options" && amount < 0.7) {
 227                 var optionmenu = document.getElementById("optionmenu");
 228                 if (optionmenu.style.display === "block") {
 229                         amount = 0.7;
 230                 }
 231         }
 232         elem.style.opacity = amount;
 233 }
 234
 235 function center_image(num)
 236 {
 237         var screen_size = find_width();
 238         var dpr = find_dpr();
 239         var width, height;
 240
 241         if (global_image_list[num][2] == -1) {
 242                 // no size information, use our pessimal guess
 243                 var adjusted_size = max_image_size(screen_size);
 244                 width = adjusted_size[0];
 245                 height = adjusted_size[1];
 246         } else {
 247                 // use the exact information
 248                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 249                 width = adjusted_size[2];
 250                 height = adjusted_size[3];
 251         }
 252
 253         // center the image on-screen
 254         var main = document.getElementById("main");
 255         main.style.position = "absolute";
 256         main.style.left = (((screen_size[0] - width) / 2) / dpr) + "px";
 257         main.style.top = (((screen_size[1] - height) / 2) / dpr) + "px";
 258         main.style.width = (width / dpr) + "px";
 259         main.style.height = (height / dpr) + "px";
 260         main.style.lineHeight = (height / dpr) + "px";
 261 }
 262
 263 function relayout()
 264 {
 265         var img = display_image_num(global_image_num, "image");
 266         if (can_go_next()) {
 267                 prepare_preload(img, global_image_num + 1);
 268         }
 269
 270         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 271         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 272         set_opacity("close", global_default_opacity);
 273         set_opacity("options", global_default_opacity);
 274 }
 275
 276 function go_previous()
 277 {
 278         if (!can_go_previous()) {
 279                 return;
 280         }
 281
 282         var img = display_image_num(--global_image_num, "image");
 283         if (can_go_previous()) {
 284                 set_opacity("previous", global_default_opacity);
 285                 prepare_preload(img, global_image_num - 1);
 286         } else {
 287                 set_opacity("previous", global_disabled_opacity);
 288         }
 289         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
 290 }
 291
 292 function go_next()
 293 {
 294         if (!can_go_next()) {
 295                 return;
 296         }
 297
 298         var img = display_image_num(++global_image_num, "image");
 299         if (can_go_next()) {
 300                 set_opacity("next", global_default_opacity);
 301                 prepare_preload(img, global_image_num + 1);
 302         } else {
 303                 set_opacity("next", global_disabled_opacity);
 304         }
 305         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
 306 }
 307
 308 function do_close()
 309 {
 310         if (global_image_num > 0) {
 311                 window.location = global_return_url + '#' + (global_image_num + 1);
 312         } else {
 313                 window.location = global_return_url;
 314         }
 315 }
 316
 317 function toggle_optionmenu()
 318 {
 319         var optionmenu = document.getElementById("optionmenu");
 320         if (optionmenu.style.display === "block") {
 321                 optionmenu.style.display = "none";
 322         } else {
 323                 optionmenu.style.display = "block";
 324                 set_opacity("options", 0.7);
 325         }
 326 }
 327
 328 function draw_text(msg)
 329 {
 330         // remove any text we might have left
 331         var text = document.getElementById("text");
 332         if (text !== null) {
 333                 text.parentNode.removeChild(text);
 334         }
 335
 336         text = document.createElement("p");
 337         text.id = "text";
 338         text.style.position = "absolute";
 339         text.style.color = "white";
 340         text.style.lineHeight = "24px";
 341         text.style.font = "24px verdana, arial, sans-serif";
 342         text.innerHTML = msg;
 343
 344         var main = document.getElementById("main");
 345         main.appendChild(text);
 346
 347         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 348         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 349 }
 350
 351 function fade_text(opacity)
 352 {
 353         set_opacity("text", opacity);
 354         if (opacity > 0.0) {
 355                 opacity -= 0.03;
 356                 if (opacity < 0.0) {
 357                         opacity = 0.0;
 358                 }
 359                 setTimeout("fade_text(" + opacity + ")", 30);
 360         } else {
 361                 var text = document.getElementById("text");
 362                 if (text !== null) {
 363                         text.parentNode.removeChild(text);
 364                 }
 365         }
 366 }
 367
 368 function select_image(evt, filename, selected)
 369 {
 370         if (selected) {
 371                 draw_text("Selecting " + filename + "...");
 372         } else {
 373                 draw_text("Unselecting " + filename + "...");
 374         }
 375
 376         var req = new XMLHttpRequest();
 377         req.open("POST", window.location.origin + "/select", false);
 378         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 379         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
 380
 381         setTimeout("fade_text(0.99)", 30);
 382 }
 383
 384 function key_down(which)
 385 {
 386         if (which == 39) {   // right
 387                 if (can_go_next()) {
 388                         set_opacity("next", global_highlight_opacity);
 389                 }
 390         } else if (which == 37) {   // left
 391                 if (can_go_previous()) {
 392                         set_opacity("previous", global_highlight_opacity);
 393                 }
 394         } else if (which == 27) {   // escape
 395                 set_opacity("close", global_higlight_opacity);
 396         } else {
 397                 check_for_hash_change();
 398         }
 399 }
 400
 401 function key_up(which) {
 402         if (which == 39) {   // right
 403                 if (can_go_next()) {
 404                         set_opacity("next", global_default_opacity);
 405                         go_next();
 406                 }
 407         } else if (which == 37) {   // left
 408                 if (can_go_previous()) {
 409                         set_opacity("previous", global_default_opacity);
 410                         go_previous();
 411                 }
 412         } else if (which == 27) {   // escape
 413                 set_opacity("close", global_default_opacity);
 414                 do_close();
 415         } else if (which == 32 && global_select) {   // space
 416                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
 417         } else if (which == 85 && global_select) {   // u
 418                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
 419         } else {
 420                 check_for_hash_change();
 421         }
 422 }
 423
 424 function parse_image_num(default_value) {
 425         var num = parseInt(window.location.hash.substr(1));
 426         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 427                 return (num - 1);
 428         } else {
 429                 return default_value;
 430         }
 431 }
 432
 433 function check_for_hash_change() {
 434         var num = parse_image_num(-1);
 435         if (num != -1 && num != global_image_num) {
 436                 global_image_num = num;
 437                 relayout();
 438         }
 439 }
 440
 441 function toggle_immersive() {
 442         if (global_default_opacity == 0.7) {
 443                 global_disabled_opacity = 0.0;
 444                 global_default_opacity = 0.0;
 445                 global_highlight_opacity = 0.2;
 446                 global_infobox = false;
 447                 document.getElementById('immersivetoggle').innerHTML = 'Show decorations';
 448         } else {
 449                 global_disabled_opacity = 0.1;
 450                 global_default_opacity = 0.7;
 451                 global_highlight_opacity = 1.0;
 452                 global_infobox = true;
 453                 document.getElementById('immersivetoggle').innerHTML = 'Hide all decorations';
 454         }
 455         relayout();
 456 }
 457
 458 window.onload = function() {
 459         relayout();
 460         setInterval(check_for_hash_change, 1000);
 461
 462         var body = document.body;
 463         body.onresize = function() { relayout(); };
 464         body.onkeydown = function() { key_down(event.keyCode); };
 465         body.onkeyup = function() { key_up(event.keyCode); };
 466         body.onhashchange = function() { check_for_hash_change(); };
 467         body.onclick = function() { check_for_hash_change(); };
 468
 469         var previous = document.getElementById('previous');
 470         previous.onmousedown = function() { if (can_go_previous()) { set_opacity('previous', global_highlight_opacity); } };
 471         previous.onmouseup = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); go_previous(); } };
 472         previous.onmouseout = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); } };
 473
 474         var next = document.getElementById('next');
 475         next.onmousedown = function() { if (can_go_next()) { set_opacity('next', global_highlight_opacity); } };
 476         next.onmouseup = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); go_next(); } };
 477         next.onmouseout = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); } };
 478
 479         var close = document.getElementById('close');
 480         close.onmousedown = function() { set_opacity('close', global_highlight_opacity); };
 481         close.onmouseup = function() { set_opacity('close', global_default_opacity); do_close(); };
 482         close.onmouseout = function() { set_opacity('close', global_default_opacity); };
 483
 484         var options = document.getElementById('options');
 485         options.onmousedown = function() { set_opacity('options', global_highlight_opacity); };
 486         options.onmouseup = function() { set_opacity('options', global_default_opacity); toggle_optionmenu(); };
 487         options.onmouseout = function() { set_opacity('options', global_default_opacity); };
 488 };