git.sesse.net Git - pr0n/blob - pr0n-fullscreen.js

   1 function find_width()
   2 {
   3         if (typeof(window.innerWidth) == 'number') {
   4                 // non-IE
   5                 return [window.innerWidth, window.innerHeight];
   6         } else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
   7                 // IE 6+ in 'standards compliant mode'
   8                 return [document.documentElement.clientWidth, document.documentElement.clientHeight];
   9         } else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
  10                 // IE 4-compatible
  11                 return [document.body.clientWidth, document.body.clientHeight];
  12         }
  13         return [null,null];
  14 }
  15
  16 /*
  17  * pr0n can resize to any size we'd like, but we're much more likely
  18  * to have this set of fixed-resolution screens cached, so to increase
  19  * performance, we round down to the closest fit and use that.
  20  */
  21 function reduce_to_fixed_width(size)
  22 {
  23         var fixed_sizes = [
  24                 [ 1280, 960 ],
  25                 [ 1024, 768 ],
  26                 [ 800, 600 ],
  27                 [ 640, 480 ],
  28                 [ 512, 384 ],
  29                 [ 320, 256 ],
  30                 [ 240, 192 ],
  31                 [ 120, 96 ],
  32                 [ 80, 64 ]
  33         ];
  34         for (i = 0; i < fixed_sizes.length; ++i) {
  35                 if (size[0] >= fixed_sizes[i][0] && size[1] >= fixed_sizes[i][1])
  36                         return fixed_sizes[i];
  37         }
  38         return [ 80, 64 ];
  39 }
  40
  41 function display_image(width, height, evt, filename, element_id)
  42 {
  43         var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/" + filename;
  44         var img = document.getElementById(element_id);
  45         if (img != null) {
  46                 img.src = "";
  47                 img.parentNode.removeChild(img);
  48         }
  49
  50         img = document.createElement("img");
  51         img.id = element_id;
  52         img.alt = "";
  53
  54         if (img.src != url) {
  55                 img.src = url;
  56         }
  57
  58         var main = document.getElementById("main");
  59         main.appendChild(img);
  60
  61         return img;
  62 }
  63
  64 function prepare_preload(img, width, height, evt, filename)
  65 {
  66         // cancel any pending preload
  67         var preload = document.getElementById("preload");
  68         if (preload != null) {
  69                 preload.src = "";
  70                 preload.parentNode.removeChild(preload);
  71         }
  72
  73         if (document.all) {  // IE-specific
  74                 img.onload = "display_image(" + width + "," + height + ",\"" + evt + "\",\"" + filename + "\",\"preload\");";
  75         } else {
  76                 img.onload = function() { display_image(width, height, evt, filename, "preload"); }
  77         }
  78 }
  79
  80 function relayout()
  81 {
  82         var size = find_width();
  83         var adjusted_size = reduce_to_fixed_width(size);
  84
  85         var img = display_image(adjusted_size[0], adjusted_size[1], global_evt, global_image_list[global_image_num], "image");
  86         if (can_go_next()) {
  87                 prepare_preload(img, adjusted_size[0], adjusted_size[1], global_evt, global_image_list[global_image_num + 1]);
  88         }
  89
  90         // center the image on-screen
  91         var main = document.getElementById("main");
  92         main.style.position = "absolute";
  93         main.style.left = (size[0] - adjusted_size[0]) / 2 + "px";
  94         main.style.top = (size[1] - adjusted_size[1]) / 2 + "px";
  95         main.style.width = adjusted_size[0] + "px";
  96         main.style.height = adjusted_size[1] + "px";
  97         main.style.lineHeight = adjusted_size[1] + "px";
  98
  99         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 100         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 101         set_opacity("close", 0.7);
 102 }
 103
 104 function set_opacity(id, amount)
 105 {
 106         var elem = document.getElementById(id);
 107         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
 108                 elem.style.opacity = amount;
 109         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
 110                 elem.style.mozOpacity = amount;
 111         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
 112                 if (elem.style.filter.indexOf("alpha") == -1) {
 113                         // add an alpha filter if there isn't one already
 114                         if (elem.style.filter) {
 115                                 elem.style.filter += " ";
 116                         } else {
 117                                 elem.style.filter = "";
 118                         }
 119                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
 120                 } else {
 121                         elem.filters.alpha.opacity = (amount * 100.0);
 122                 }
 123         } else {                             // no alpha support
 124                 if (amount > 0.5) {
 125                         elem.style.visibility = "visible";
 126                         elem.style.zorder = 1;
 127                 } else {
 128                         elem.style.visibility = "hidden";
 129                 }
 130         }
 131 }
 132
 133 function can_go_previous()
 134 {
 135         return (global_image_num > 0);
 136 }
 137
 138 function go_previous()
 139 {
 140         if (!can_go_previous())
 141                 return;
 142
 143         --global_image_num;
 144
 145         var adjusted_size = reduce_to_fixed_width(find_width());
 146
 147         var img = display_image(adjusted_size[0], adjusted_size[1], global_evt, global_image_list[global_image_num], "image");
 148         if (can_go_previous()) {
 149                 set_opacity("previous", 0.7);
 150                 prepare_preload(img, adjusted_size[0], adjusted_size[1], global_evt, global_image_list[global_image_num - 1]);
 151         } else {
 152                 set_opacity("previous", 0.1);
 153         }
 154         set_opacity("next", can_go_next() ? 0.7 : 0.1);
 155 }
 156
 157 function can_go_next()
 158 {
 159         return (global_image_num < global_image_list.length - 1);
 160 }
 161
 162 function go_next()
 163 {
 164         if (!can_go_next())
 165                 return;
 166
 167         ++global_image_num;
 168
 169         var adjusted_size = reduce_to_fixed_width(find_width());
 170
 171         var img = display_image(adjusted_size[0], adjusted_size[1], global_evt, global_image_list[global_image_num], "image");
 172         if (can_go_next()) {
 173                 set_opacity("next", 0.7);
 174                 prepare_preload(img, adjusted_size[0], adjusted_size[1], global_evt, global_image_list[global_image_num + 1]);
 175         } else {
 176                 set_opacity("next", 0.1);
 177         }
 178         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
 179 }
 180
 181 function key_down(which)
 182 {
 183         if (which == 39) {   // right
 184                 if (can_go_next()) {
 185                         set_opacity("next", 0.99);
 186                 }
 187         } else if (which == 37) {   // left
 188                 if (can_go_previous()) {
 189                         set_opacity("previous", 0.99);
 190                 }
 191         } else if (which == 27) {   // escape
 192                 set_opacity("close", 0.99);
 193         }
 194 }
 195
 196 function key_up(which) {
 197         if (which == 39) {   // right
 198                 if (can_go_next()) {
 199                         set_opacity("next", 0.7);
 200                         go_next();
 201                 }
 202         } else if (which == 37) {   // left
 203                 if (can_go_previous()) {
 204                         set_opacity("previous", 0.7);
 205                         go_previous();
 206                 }
 207         } else if (which == 27) {   // escape
 208                 set_opacity("close", 0.7);
 209                 do_close();
 210         }
 211 }
 212
 213 function do_close()
 214 {
 215         window.location = global_return_url;
 216 }
 217
 218 // enable the horrible horrible IE PNG hack
 219 function ie_png_hack()
 220 {
 221         var vstr = navigator.appVersion.split("MSIE");
 222         var v = parseFloat(vstr[1]);
 223         if (v >= 5.5 && v < 7.0 && document.body.filters) {
 224                 var next = document.getElementById("next");
 225                 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); }\" />";
 226
 227                 var previous = document.getElementById("previous");
 228                 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); }\" />";
 229         }
 230 }