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