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