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