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