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                         // be sure _not_ to return a reference
 103                         return [ fixed_sizes[i][0], fixed_sizes[i][1] ];
 104                 }
 105         }
 106         return [ 80, 64 ];
 107 }
 108
 109 function display_image(width, height, evt, filename, element_id)
 110 {
 111         var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/" + global_infobox + filename;
 112         var img = document.getElementById(element_id);
 113         if (img !== null) {
 114                 img.src = "data:";
 115                 img.parentNode.removeChild(img);
 116         }
 117
 118         img = document.createElement("img");
 119         img.id = element_id;
 120         img.alt = "";
 121
 122         if (img.src != url) {
 123                 img.src = url;
 124         }
 125
 126         var main = document.getElementById("iehack");
 127         main.appendChild(img);
 128
 129         return img;
 130 }
 131
 132 function display_image_num(num, element_id)
 133 {
 134         var screen_size = find_width();
 135         var adjusted_size;
 136
 137         if (global_image_list[num][2] == -1) {
 138                 // no size information, use our pessimal guess
 139                 adjusted_size = max_image_size(screen_size);
 140         } else {
 141                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 142         }
 143
 144         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 145         if (element_id == "image") {
 146                 center_image(num);
 147         }
 148         return img;
 149 }
 150
 151 function prepare_preload(img, num)
 152 {
 153         // cancel any pending preload
 154         var preload = document.getElementById("preload");
 155         if (preload !== null) {
 156                 preload.src = "data:";
 157                 preload.parentNode.removeChild(preload);
 158         }
 159
 160         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 161         // completeness first; should at least be _somewhat_ better
 162         if (img.complete) {
 163                 display_image_num(num, "preload");
 164         } else {
 165                 img.onload = function() { display_image_num(num, "preload"); };
 166         }
 167 }
 168
 169 function can_go_next()
 170 {
 171         return (global_image_num < global_image_list.length - 1);
 172 }
 173
 174 function can_go_previous()
 175 {
 176         return (global_image_num > 0);
 177 }
 178
 179 function set_opacity(id, amount)
 180 {
 181         var elem = document.getElementById(id);
 182         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
 183                 elem.style.opacity = amount;
 184         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
 185                 elem.style.mozOpacity = amount;
 186         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
 187                 if (elem.style.filter.indexOf("alpha") == -1) {
 188                         // add an alpha filter if there isn't one already
 189                         if (elem.style.filter) {
 190                                 elem.style.filter += " ";
 191                         } else {
 192                                 elem.style.filter = "";
 193                         }
 194                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
 195                 } else {
 196                         // ugh? this seems to break in color index mode...
 197                         if (typeof(elem.filters) == 'unknown') {
 198                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
 199                         } else {
 200                                 elem.filters.alpha.opacity = (amount * 100.0);
 201                         }
 202                 }
 203         } else {                             // no alpha support
 204                 if (amount > 0.5) {
 205                         elem.style.visibility = "visible";
 206                         elem.style.zorder = 1;
 207                 } else {
 208                         elem.style.visibility = "hidden";
 209                 }
 210         }
 211 }
 212
 213 function center_image(num)
 214 {
 215         var screen_size = find_width();
 216         var adjusted_size;
 217
 218         if (global_image_list[num][2] == -1) {
 219                 // no size information, use our pessimal guess
 220                 adjusted_size = max_image_size(screen_size);
 221         } else {
 222                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 223         }
 224
 225         // crop the div to the screen
 226         if (adjusted_size[0] > screen_size[0]) {
 227                 adjusted_size[0] = screen_size[0];
 228         }
 229         if (adjusted_size[1] > screen_size[1]) {
 230                 adjusted_size[1] = screen_size[1];
 231         }
 232
 233         // center the image on-screen
 234         var main = document.getElementById("main");
 235         main.style.position = "absolute";
 236         main.style.left = (screen_size[0] - adjusted_size[0]) / 2 + "px";
 237         main.style.top = (screen_size[1] - adjusted_size[1]) / 2 + "px";
 238         main.style.width = adjusted_size[0] + "px";
 239         main.style.height = adjusted_size[1] + "px";
 240         main.style.lineHeight = adjusted_size[1] + "px";
 241
 242 }
 243
 244 function relayout()
 245 {
 246         var img = display_image_num(global_image_num, "image");
 247         if (can_go_next()) {
 248                 prepare_preload(img, global_image_num + 1);
 249         }
 250
 251         center_image(global_image_num);
 252
 253         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 254         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 255         set_opacity("close", 0.7);
 256 }
 257
 258 function go_previous()
 259 {
 260         if (!can_go_previous()) {
 261                 return;
 262         }
 263
 264         var img = display_image_num(--global_image_num, "image");
 265         if (can_go_previous()) {
 266                 set_opacity("previous", 0.7);
 267                 prepare_preload(img, global_image_num - 1);
 268         } else {
 269                 set_opacity("previous", 0.1);
 270         }
 271         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 272 }
 273
 274 function go_next()
 275 {
 276         if (!can_go_next()) {
 277                 return;
 278         }
 279
 280         var img = display_image_num(++global_image_num, "image");
 281         if (can_go_next()) {
 282                 set_opacity("next", 0.7);
 283                 prepare_preload(img, global_image_num + 1);
 284         } else {
 285                 set_opacity("next", 0.1);
 286         }
 287         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 288 }
 289
 290 function do_close()
 291 {
 292         window.location = global_return_url;
 293 }
 294
 295 function draw_text(msg)
 296 {
 297         // remove any text we might have left
 298         var text = document.getElementById("text");
 299         if (text !== null) {
 300                 text.parentNode.removeChild(text);
 301         }
 302
 303         text = document.createElement("p");
 304         text.id = "text";
 305         text.style.position = "absolute";
 306         text.style.color = "white";
 307         text.style.lineHeight = "24px";
 308         text.style.font = "24px verdana, arial, sans-serif";
 309         text.innerHTML = msg;
 310
 311         var main = document.getElementById("main");
 312         main.appendChild(text);
 313
 314         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 315         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 316 }
 317
 318 function fade_text(opacity)
 319 {
 320         set_opacity("text", opacity);
 321         if (opacity > 0.0) {
 322                 opacity -= 0.03;
 323                 if (opacity < 0.0) {
 324                         opacity = 0.0;
 325                 }
 326                 setTimeout("fade_text(" + opacity + ")", 30);
 327         } else {
 328                 var text = document.getElementById("text");
 329                 if (text !== null) {
 330                         text.parentNode.removeChild(text);
 331                 }
 332         }
 333 }
 334
 335 function select_image(evt, filename)
 336 {
 337         if (!req) {
 338                 return;
 339         }
 340
 341         draw_text("Selecting " + filename + "...");
 342
 343         req.open("POST", "http://" + global_vhost + "/select", false);
 344         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 345         req.send("mode=single&event=" + evt + "&filename=" + filename);
 346
 347         setTimeout("fade_text(0.99)", 30);
 348 }
 349
 350 function key_down(which)
 351 {
 352         if (which == 39) {   // right
 353                 if (can_go_next()) {
 354                         set_opacity("next", 0.99);
 355                 }
 356         } else if (which == 37) {   // left
 357                 if (can_go_previous()) {
 358                         set_opacity("previous", 0.99);
 359                 }
 360         } else if (which == 27) {   // escape
 361                 set_opacity("close", 0.99);
 362         }
 363 }
 364
 365 function key_up(which) {
 366         if (which == 39) {   // right
 367                 if (can_go_next()) {
 368                         set_opacity("next", 0.7);
 369                         go_next();
 370                 }
 371         } else if (which == 37) {   // left
 372                 if (can_go_previous()) {
 373                         set_opacity("previous", 0.7);
 374                         go_previous();
 375                 }
 376         } else if (which == 27) {   // escape
 377                 set_opacity("close", 0.7);
 378                 do_close();
 379         } else if (which == 32 && global_select) {   // space
 380                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1]);
 381         }
 382 }
 383
 384 // enable the horrible horrible IE PNG hack
 385 function ie_png_hack()
 386 {
 387         var vstr = navigator.appVersion.split("MSIE");
 388         var v = parseFloat(vstr[1]);
 389         if (v >= 5.5 && v < 7.0 && document.body.filters) {
 390                 var next = document.getElementById("next");
 391                 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); }\" />";
 392
 393                 var previous = document.getElementById("previous");
 394                 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); }\" />";
 395
 396                 var close = document.getElementById("close");
 397                 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);\" />";
 398         }
 399 }