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

   1 var req;
   2
   3 function init_ajax()
   4 {
   5         req = false;
   6
   7         if (window.XMLHttpRequest) {
   8                 // Mozilla/Safari
   9                 try {
  10                         req = new XMLHttpRequest();
  11                 } catch(e) {
  12                         req = false;
  13                 }
  14         } else if (window.ActiveXObject) {
  15                 // IE/Windows
  16                 try {
  17                         req = new ActiveXObject("Msxml2.XMLHTTP");
  18                 } catch(e) {
  19                         try {
  20                                 req = new ActiveXObject("Microsoft.XMLHTTP");
  21                         } catch(e) {
  22                                 req = false;
  23                         }
  24                 }
  25         }
  26 }
  27
  28 function find_width()
  29 {
  30         if (typeof(window.innerWidth) == 'number') {
  31                 // non-IE
  32                 return [window.innerWidth, window.innerHeight];
  33         } else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
  34                 // IE 6+ in 'standards compliant mode'
  35                 return [document.documentElement.clientWidth, document.documentElement.clientHeight];
  36         } else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
  37                 // IE 4-compatible
  38                 return [document.body.clientWidth, document.body.clientHeight];
  39         }
  40         return [null,null];
  41 }
  42
  43 function parse_image_num(default_value) {
  44         var num = parseInt(window.location.hash.substr(1));
  45         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
  46                 return (num - 1);
  47         } else {
  48                 return default_value;
  49         }
  50 }
  51
  52 /*
  53  * pr0n can resize to any size we'd like, but we're much more likely
  54  * to have this set of fixed-resolution screens cached, so to increase
  55  * performance, we round down to the closest fit and use that. This
  56  * function is a pessimal estimate of what thumbnail size we can _always_
  57  * fit on the screen -- it's right if and only if all images are 4:3
  58  * (and landscape). If individual size information is available, use
  59  * pick_image_size, below.
  60  */
  61 var fixed_sizes = [
  62         [ 2048, 1536 ],
  63         [ 1920, 1440 ],
  64         [ 1600, 1200 ],
  65         [ 1400, 1050 ],
  66         [ 1280, 960 ],
  67         [ 1152, 864 ],
  68         [ 1024, 768 ],
  69         [ 800, 600 ],
  70         [ 640, 480 ],
  71         [ 512, 384 ],
  72         [ 320, 256 ],
  73         [ 240, 192 ],
  74         [ 120, 96 ],
  75         [ 80, 64 ]
  76 ];
  77 function max_image_size(screen_size)
  78 {
  79         var i;
  80         for (i = 0; i < fixed_sizes.length; ++i) {
  81                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
  82                         return fixed_sizes[i];
  83                 }
  84         }
  85         return [ 80, 64 ];
  86 }
  87
  88 function pick_image_size(screen_size, image_size)
  89 {
  90         var i;
  91         for (i = 0; i < fixed_sizes.length; ++i) {
  92                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
  93                 // inaccuracies :-)
  94                 var thumbxres = fixed_sizes[i][0];
  95                 var thumbyres = fixed_sizes[i][1];
  96                 var width = image_size[0];
  97                 var height = image_size[1];
  98
  99                 if (!(thumbxres >= width && thumbyres >= height)) {
 100                         var sfh = width / thumbxres;
 101                         var sfv = height / thumbyres;
 102                         if (sfh > sfv) {
 103                                 width  /= sfh;
 104                                 height /= sfh;
 105                         } else {
 106                                 width  /= sfv;
 107                                 height /= sfv;
 108                         }
 109                         width = Math.floor(width);
 110                         height = Math.floor(height);
 111                 }
 112
 113                 if (screen_size[0] >= width && screen_size[1] >= height) {
 114                         // be sure _not_ to return a reference
 115                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
 116                 }
 117         }
 118         return [ 80, 64 ];
 119 }
 120
 121 function replace_image_element(url, element_id, parent_node)
 122 {
 123         var img = document.getElementById(element_id);
 124         if (img !== null) {
 125                 img.src = "data:";
 126                 img.parentNode.removeChild(img);
 127         }
 128
 129         img = document.createElement("img");
 130         img.id = element_id;
 131         img.alt = "";
 132
 133         if (img.src != url) {
 134                 img.src = url;
 135         }
 136
 137         parent_node.appendChild(img);
 138         return img;
 139 }
 140
 141 function display_image(width, height, evt, filename, element_id)
 142 {
 143         var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/nobox/" + filename;
 144         var main = document.getElementById("iehack");
 145         var img = replace_image_element(url, element_id, main);
 146
 147         if (global_infobox != 'nobox') {
 148                 var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
 149                 var boximg = replace_image_element(url, element_id + "_box", main);
 150
 151                 boximg.style.position = "absolute";
 152                 boximg.style.left = "0px";
 153                 boximg.style.bottom = "-1px";
 154         }
 155
 156         return img;
 157 }
 158
 159 function display_image_num(num, element_id)
 160 {
 161         var screen_size = find_width();
 162         var adjusted_size;
 163
 164         if (global_image_list[num][2] == -1) {
 165                 // no size information, use our pessimal guess
 166                 adjusted_size = max_image_size(screen_size);
 167         } else {
 168                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 169         }
 170
 171         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 172
 173         if (element_id == "image") {
 174                 // we want to shrink the box as much as possible if we know the true
 175                 // size of the image
 176                 center_image(num);
 177
 178                 // replace the anchor part (if any) with the image number
 179                 var baseurl = (window.location.toString().split("#"))[0];
 180                 window.location = baseurl + "#" + (num+1);
 181         }
 182
 183         return img;
 184 }
 185
 186 function prepare_preload(img, num)
 187 {
 188         // cancel any pending preload
 189         var preload = document.getElementById("preload");
 190         if (preload !== null) {
 191                 preload.src = "data:";
 192                 preload.parentNode.removeChild(preload);
 193         }
 194
 195         var preload_box = document.getElementById("preload_box");
 196         if (preload_box !== null) {
 197                 preload_box.src = "data:";
 198                 preload_box.parentNode.removeChild(preload_box);
 199         }
 200
 201         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 202         // completeness first; should at least be _somewhat_ better
 203         if (img.complete) {
 204                 display_image_num(num, "preload");
 205         } else {
 206                 img.onload = function() { display_image_num(num, "preload"); };
 207         }
 208 }
 209
 210 function can_go_next()
 211 {
 212         return (global_image_num < global_image_list.length - 1);
 213 }
 214
 215 function can_go_previous()
 216 {
 217         return (global_image_num > 0);
 218 }
 219
 220 function set_opacity(id, amount)
 221 {
 222         var elem = document.getElementById(id);
 223         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
 224                 elem.style.opacity = amount;
 225         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
 226                 elem.style.mozOpacity = amount;
 227         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
 228                 if (elem.style.filter.indexOf("alpha") == -1) {
 229                         // add an alpha filter if there isn't one already
 230                         if (elem.style.filter) {
 231                                 elem.style.filter += " ";
 232                         } else {
 233                                 elem.style.filter = "";
 234                         }
 235                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
 236                 } else {
 237                         // ugh? this seems to break in color index mode...
 238                         if (typeof(elem.filters) == 'unknown') {
 239                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
 240                         } else {
 241                                 elem.filters.alpha.opacity = (amount * 100.0);
 242                         }
 243                 }
 244         } else {                             // no alpha support
 245                 if (amount > 0.5) {
 246                         elem.style.visibility = "visible";
 247                         elem.style.zorder = 1;
 248                 } else {
 249                         elem.style.visibility = "hidden";
 250                 }
 251         }
 252 }
 253
 254 function center_image(num)
 255 {
 256         var screen_size = find_width();
 257         var width, height;
 258
 259         if (global_image_list[num][2] == -1) {
 260                 // no size information, use our pessimal guess
 261                 var adjusted_size = max_image_size(screen_size);
 262                 width = adjusted_size[0];
 263                 height = adjusted_size[1];
 264         } else {
 265                 // use the exact information
 266                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 267                 width = adjusted_size[2];
 268                 height = adjusted_size[3];
 269         }
 270
 271         // center the image on-screen
 272         var main = document.getElementById("main");
 273         main.style.position = "absolute";
 274         main.style.left = (screen_size[0] - width) / 2 + "px";
 275         main.style.top = (screen_size[1] - height) / 2 + "px";
 276         main.style.width = width + "px";
 277         main.style.height = height + "px";
 278         main.style.lineHeight = height + "px";
 279 }
 280
 281 function relayout()
 282 {
 283         var img = display_image_num(global_image_num, "image");
 284         if (can_go_next()) {
 285                 prepare_preload(img, global_image_num + 1);
 286         }
 287
 288         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 289         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 290         set_opacity("close", 0.7);
 291 }
 292
 293 function go_previous()
 294 {
 295         if (!can_go_previous()) {
 296                 return;
 297         }
 298
 299         var img = display_image_num(--global_image_num, "image");
 300         if (can_go_previous()) {
 301                 set_opacity("previous", 0.7);
 302                 prepare_preload(img, global_image_num - 1);
 303         } else {
 304                 set_opacity("previous", 0.1);
 305         }
 306         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 307 }
 308
 309 function go_next()
 310 {
 311         if (!can_go_next()) {
 312                 return;
 313         }
 314
 315         var img = display_image_num(++global_image_num, "image");
 316         if (can_go_next()) {
 317                 set_opacity("next", 0.7);
 318                 prepare_preload(img, global_image_num + 1);
 319         } else {
 320                 set_opacity("next", 0.1);
 321         }
 322         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 323 }
 324
 325 function do_close()
 326 {
 327         window.location = global_return_url;
 328 }
 329
 330 function draw_text(msg)
 331 {
 332         // remove any text we might have left
 333         var text = document.getElementById("text");
 334         if (text !== null) {
 335                 text.parentNode.removeChild(text);
 336         }
 337
 338         text = document.createElement("p");
 339         text.id = "text";
 340         text.style.position = "absolute";
 341         text.style.color = "white";
 342         text.style.lineHeight = "24px";
 343         text.style.font = "24px verdana, arial, sans-serif";
 344         text.innerHTML = msg;
 345
 346         var main = document.getElementById("main");
 347         main.appendChild(text);
 348
 349         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 350         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 351 }
 352
 353 function fade_text(opacity)
 354 {
 355         set_opacity("text", opacity);
 356         if (opacity > 0.0) {
 357                 opacity -= 0.03;
 358                 if (opacity < 0.0) {
 359                         opacity = 0.0;
 360                 }
 361                 setTimeout("fade_text(" + opacity + ")", 30);
 362         } else {
 363                 var text = document.getElementById("text");
 364                 if (text !== null) {
 365                         text.parentNode.removeChild(text);
 366                 }
 367         }
 368 }
 369
 370 function select_image(evt, filename)
 371 {
 372         if (!req) {
 373                 return;
 374         }
 375
 376         draw_text("Selecting " + filename + "...");
 377
 378         req.open("POST", "http://" + global_vhost + "/select", false);
 379         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 380         req.send("mode=single&event=" + evt + "&filename=" + filename);
 381
 382         setTimeout("fade_text(0.99)", 30);
 383 }
 384
 385 function key_down(which)
 386 {
 387         if (which == 39) {   // right
 388                 if (can_go_next()) {
 389                         set_opacity("next", 0.99);
 390                 }
 391         } else if (which == 37) {   // left
 392                 if (can_go_previous()) {
 393                         set_opacity("previous", 0.99);
 394                 }
 395         } else if (which == 27) {   // escape
 396                 set_opacity("close", 0.99);
 397         } else {
 398                 check_for_hash_change();
 399         }
 400 }
 401
 402 function key_up(which) {
 403         if (which == 39) {   // right
 404                 if (can_go_next()) {
 405                         set_opacity("next", 0.7);
 406                         go_next();
 407                 }
 408         } else if (which == 37) {   // left
 409                 if (can_go_previous()) {
 410                         set_opacity("previous", 0.7);
 411                         go_previous();
 412                 }
 413         } else if (which == 27) {   // escape
 414                 set_opacity("close", 0.7);
 415                 do_close();
 416         } else if (which == 32 && global_select) {   // space
 417                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1]);
 418         } else {
 419                 check_for_hash_change();
 420         }
 421 }
 422
 423 // enable the horrible horrible IE PNG hack
 424 function ie_png_hack()
 425 {
 426         var vstr = navigator.appVersion.split("MSIE");
 427         var v = parseFloat(vstr[1]);
 428         if (v >= 5.5 && v < 7.0 && document.body.filters) {
 429                 var next = document.getElementById("next");
 430                 next.outerHTML = "<span id=\"next\" style=\"display: inline-block; position: absolute; bottom: 0px; right: 0px; width: 50px; height: 50px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + next.src + "')\" onmousedown=\"if (can_go_next()) set_opacity('next', 1.0)\" onmouseup=\"if (can_go_next()) { set_opacity('next', 0.7); go_next(); }\" onmouseout=\"if (can_go_next()) { set_opacity('next', 0.7); }\" />";
 431
 432                 var previous = document.getElementById("previous");
 433                 previous.outerHTML = "<span id=\"previous\" style=\"display: inline-block; position: absolute; bottom: 0px; right: 0px; width: 50px; height: 50px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + previous.src + "')\" onmousedown=\"if (can_go_previous()) set_opacity('previous', 1.0)\" onmouseup=\"if (can_go_previous()) { set_opacity('previous', 0.7); go_previous(); }\" onmouseout=\"if (can_go_previous()) { set_opacity('previous', 0.7); }\" />";
 434
 435                 var close = document.getElementById("close");
 436                 close.outerHTML = "<span id=\"close\" style=\"display: inline-block; position: absolute; top: 0px; right: 0px; width: 50px; height: 50px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + close.src + "')\" onmousedown=\"set_opacity('close', 1.0)\" onmouseup=\"set_opacity('close', 0.7); do_close();\" onmouseout=\"set_opacity('close', 0.7);\" />";
 437         }
 438 }
 439
 440 function check_for_hash_change() {
 441         var num = parseInt(window.location.hash.substr(1));
 442         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 443                 if (--num != global_image_num) {
 444                         global_image_num = num;
 445                         relayout();
 446                 }
 447         }
 448 }