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