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 display_image(width, height, evt, filename, element_id)
 125 {
 126         var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/" + global_infobox + filename;
 127         var img = document.getElementById(element_id);
 128         if (img !== null) {
 129                 img.src = "data:";
 130                 img.parentNode.removeChild(img);
 131         }
 132
 133         img = document.createElement("img");
 134         img.id = element_id;
 135         img.alt = "";
 136
 137         if (img.src != url) {
 138                 img.src = url;
 139         }
 140
 141         var main = document.getElementById("iehack");
 142         main.appendChild(img);
 143
 144         return img;
 145 }
 146
 147 function display_image_num(num, element_id)
 148 {
 149         var screen_size = find_width();
 150         var adjusted_size;
 151
 152         if (global_image_list[num][2] == -1) {
 153                 // no size information, use our pessimal guess
 154                 adjusted_size = max_image_size(screen_size);
 155         } else {
 156                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 157         }
 158
 159         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 160
 161         if (element_id == "image") {
 162                 // we want to shrink the box as much as possible if we know the true
 163                 // size of the image
 164                 center_image(num);
 165
 166                 // replace the anchor part (if any) with the image number
 167                 var baseurl = (window.location.toString().split("#"))[0];
 168                 window.location = baseurl + "#" + (num+1);
 169         }
 170
 171         return img;
 172 }
 173
 174 function prepare_preload(img, num)
 175 {
 176         // cancel any pending preload
 177         var preload = document.getElementById("preload");
 178         if (preload !== null) {
 179                 preload.src = "data:";
 180                 preload.parentNode.removeChild(preload);
 181         }
 182
 183         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 184         // completeness first; should at least be _somewhat_ better
 185         if (img.complete) {
 186                 display_image_num(num, "preload");
 187         } else {
 188                 img.onload = function() { display_image_num(num, "preload"); };
 189         }
 190 }
 191
 192 function can_go_next()
 193 {
 194         return (global_image_num < global_image_list.length - 1);
 195 }
 196
 197 function can_go_previous()
 198 {
 199         return (global_image_num > 0);
 200 }
 201
 202 function set_opacity(id, amount)
 203 {
 204         var elem = document.getElementById(id);
 205         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
 206                 elem.style.opacity = amount;
 207         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
 208                 elem.style.mozOpacity = amount;
 209         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
 210                 if (elem.style.filter.indexOf("alpha") == -1) {
 211                         // add an alpha filter if there isn't one already
 212                         if (elem.style.filter) {
 213                                 elem.style.filter += " ";
 214                         } else {
 215                                 elem.style.filter = "";
 216                         }
 217                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
 218                 } else {
 219                         // ugh? this seems to break in color index mode...
 220                         if (typeof(elem.filters) == 'unknown') {
 221                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
 222                         } else {
 223                                 elem.filters.alpha.opacity = (amount * 100.0);
 224                         }
 225                 }
 226         } else {                             // no alpha support
 227                 if (amount > 0.5) {
 228                         elem.style.visibility = "visible";
 229                         elem.style.zorder = 1;
 230                 } else {
 231                         elem.style.visibility = "hidden";
 232                 }
 233         }
 234 }
 235
 236 function center_image(num)
 237 {
 238         var screen_size = find_width();
 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 + "px";
 257         main.style.top = (screen_size[1] - height) / 2 + "px";
 258         main.style.width = width + "px";
 259         main.style.height = height + "px";
 260         main.style.lineHeight = height + "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() ? 0.7 : 0.1);
 271         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 272         set_opacity("close", 0.7);
 273 }
 274
 275 function go_previous()
 276 {
 277         if (!can_go_previous()) {
 278                 return;
 279         }
 280
 281         var img = display_image_num(--global_image_num, "image");
 282         if (can_go_previous()) {
 283                 set_opacity("previous", 0.7);
 284                 prepare_preload(img, global_image_num - 1);
 285         } else {
 286                 set_opacity("previous", 0.1);
 287         }
 288         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 289 }
 290
 291 function go_next()
 292 {
 293         if (!can_go_next()) {
 294                 return;
 295         }
 296
 297         var img = display_image_num(++global_image_num, "image");
 298         if (can_go_next()) {
 299                 set_opacity("next", 0.7);
 300                 prepare_preload(img, global_image_num + 1);
 301         } else {
 302                 set_opacity("next", 0.1);
 303         }
 304         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 305 }
 306
 307 function do_close()
 308 {
 309         window.location = global_return_url;
 310 }
 311
 312 function draw_text(msg)
 313 {
 314         // remove any text we might have left
 315         var text = document.getElementById("text");
 316         if (text !== null) {
 317                 text.parentNode.removeChild(text);
 318         }
 319
 320         text = document.createElement("p");
 321         text.id = "text";
 322         text.style.position = "absolute";
 323         text.style.color = "white";
 324         text.style.lineHeight = "24px";
 325         text.style.font = "24px verdana, arial, sans-serif";
 326         text.innerHTML = msg;
 327
 328         var main = document.getElementById("main");
 329         main.appendChild(text);
 330
 331         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 332         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 333 }
 334
 335 function fade_text(opacity)
 336 {
 337         set_opacity("text", opacity);
 338         if (opacity > 0.0) {
 339                 opacity -= 0.03;
 340                 if (opacity < 0.0) {
 341                         opacity = 0.0;
 342                 }
 343                 setTimeout("fade_text(" + opacity + ")", 30);
 344         } else {
 345                 var text = document.getElementById("text");
 346                 if (text !== null) {
 347                         text.parentNode.removeChild(text);
 348                 }
 349         }
 350 }
 351
 352 function select_image(evt, filename)
 353 {
 354         if (!req) {
 355                 return;
 356         }
 357
 358         draw_text("Selecting " + filename + "...");
 359
 360         req.open("POST", "http://" + global_vhost + "/select", false);
 361         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 362         req.send("mode=single&event=" + evt + "&filename=" + filename);
 363
 364         setTimeout("fade_text(0.99)", 30);
 365 }
 366
 367 function key_down(which)
 368 {
 369         if (which == 39) {   // right
 370                 if (can_go_next()) {
 371                         set_opacity("next", 0.99);
 372                 }
 373         } else if (which == 37) {   // left
 374                 if (can_go_previous()) {
 375                         set_opacity("previous", 0.99);
 376                 }
 377         } else if (which == 27) {   // escape
 378                 set_opacity("close", 0.99);
 379         }
 380 }
 381
 382 function key_up(which) {
 383         if (which == 39) {   // right
 384                 if (can_go_next()) {
 385                         set_opacity("next", 0.7);
 386                         go_next();
 387                 }
 388         } else if (which == 37) {   // left
 389                 if (can_go_previous()) {
 390                         set_opacity("previous", 0.7);
 391                         go_previous();
 392                 }
 393         } else if (which == 27) {   // escape
 394                 set_opacity("close", 0.7);
 395                 do_close();
 396         } else if (which == 32 && global_select) {   // space
 397                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1]);
 398         }
 399 }
 400
 401 // enable the horrible horrible IE PNG hack
 402 function ie_png_hack()
 403 {
 404         var vstr = navigator.appVersion.split("MSIE");
 405         var v = parseFloat(vstr[1]);
 406         if (v >= 5.5 && v < 7.0 && document.body.filters) {
 407                 var next = document.getElementById("next");
 408                 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); }\" />";
 409
 410                 var previous = document.getElementById("previous");
 411                 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); }\" />";
 412
 413                 var close = document.getElementById("close");
 414                 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);\" />";
 415         }
 416 }