Through a fun set of hacks for the whole family (it's amazing that this should
[pr0n] / 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], width, height ];
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         
146         if (element_id == "image") {
147                 // we want to shrink the box as much as possible if we know the true
148                 // size of the image
149                 center_image(num);
150                 
151                 document.getElementById('linkbg1').href = global_bookmark_url_base + (num+1);
152                 document.getElementById('linkbg2').href = global_bookmark_url_base + (num+1);
153                 document.getElementById('linkbg3').href = global_bookmark_url_base + (num+1);
154         }
155
156         return img;
157 }
158
159 function prepare_preload(img, num)
160 {
161         // cancel any pending preload
162         var preload = document.getElementById("preload");
163         if (preload !== null) {
164                 preload.src = "data:";
165                 preload.parentNode.removeChild(preload);
166         }
167
168         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
169         // completeness first; should at least be _somewhat_ better
170         if (img.complete) {
171                 display_image_num(num, "preload");
172         } else {
173                 img.onload = function() { display_image_num(num, "preload"); };
174         }       
175 }
176
177 function can_go_next()
178 {
179         return (global_image_num < global_image_list.length - 1);
180 }
181
182 function can_go_previous()
183 {
184         return (global_image_num > 0);
185 }
186
187 function set_opacity(id, amount)
188 {
189         var elem = document.getElementById(id);
190         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
191                 elem.style.opacity = amount;
192         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
193                 elem.style.mozOpacity = amount;
194         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
195                 if (elem.style.filter.indexOf("alpha") == -1) {
196                         // add an alpha filter if there isn't one already
197                         if (elem.style.filter) {
198                                 elem.style.filter += " ";
199                         } else {
200                                 elem.style.filter = "";
201                         }
202                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
203                 } else {        
204                         // ugh? this seems to break in color index mode...
205                         if (typeof(elem.filters) == 'unknown') {
206                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
207                         } else {
208                                 elem.filters.alpha.opacity = (amount * 100.0);
209                         }
210                 }
211         } else {                             // no alpha support
212                 if (amount > 0.5) {
213                         elem.style.visibility = "visible";
214                         elem.style.zorder = 1;
215                 } else {
216                         elem.style.visibility = "hidden";
217                 }
218         }
219 }
220
221 function center_image(num)
222 {
223         var screen_size = find_width();
224         var width, height;
225         
226         if (global_image_list[num][2] == -1) {
227                 // no size information, use our pessimal guess
228                 var adjusted_size = max_image_size(screen_size);
229                 width = adjusted_size[0];
230                 height = adjusted_size[1];
231         } else {
232                 // use the exact information
233                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
234                 width = adjusted_size[2];
235                 height = adjusted_size[3];
236         }
237
238         // center the image on-screen
239         var main = document.getElementById("main");
240         main.style.position = "absolute";
241         main.style.left = (screen_size[0] - width) / 2 + "px";
242         main.style.top = (screen_size[1] - height) / 2 + "px"; 
243         main.style.width = width + "px";
244         main.style.height = height + "px";
245         main.style.lineHeight = height + "px";
246 }
247
248 function relayout()
249 {
250         var img = display_image_num(global_image_num, "image");
251         if (can_go_next()) {
252                 prepare_preload(img, global_image_num + 1);
253         }
254
255         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
256         set_opacity("next", can_go_next() ? 0.7 : 0.1);
257         set_opacity("close", 0.7);
258 }
259
260 function go_previous()
261 {
262         if (!can_go_previous()) {
263                 return;
264         }
265
266         var img = display_image_num(--global_image_num, "image");
267         if (can_go_previous()) {
268                 set_opacity("previous", 0.7);
269                 prepare_preload(img, global_image_num - 1);
270         } else {
271                 set_opacity("previous", 0.1);
272         }
273         set_opacity("next", can_go_next() ? 0.7 : 0.1);
274 }
275
276 function go_next()
277 {
278         if (!can_go_next()) {
279                 return;
280         }
281
282         var img = display_image_num(++global_image_num, "image");
283         if (can_go_next()) {
284                 set_opacity("next", 0.7);
285                 prepare_preload(img, global_image_num + 1);
286         } else {
287                 set_opacity("next", 0.1);
288         }
289         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
290 }
291
292 function do_close()
293 {
294         window.location = global_return_url;
295 }
296
297 function draw_text(msg)
298 {
299         // remove any text we might have left
300         var text = document.getElementById("text");
301         if (text !== null) {
302                 text.parentNode.removeChild(text);
303         }
304
305         text = document.createElement("p");
306         text.id = "text";
307         text.style.position = "absolute";
308         text.style.color = "white";
309         text.style.lineHeight = "24px";
310         text.style.font = "24px verdana, arial, sans-serif";
311         text.innerHTML = msg;
312
313         var main = document.getElementById("main");
314         main.appendChild(text);
315
316         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
317         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
318 }
319
320 function fade_text(opacity)
321 {
322         set_opacity("text", opacity);
323         if (opacity > 0.0) {
324                 opacity -= 0.03;
325                 if (opacity < 0.0) {
326                         opacity = 0.0;
327                 }
328                 setTimeout("fade_text(" + opacity + ")", 30);
329         } else {
330                 var text = document.getElementById("text");
331                 if (text !== null) {
332                         text.parentNode.removeChild(text);
333                 }
334         }
335 }
336
337 function select_image(evt, filename)
338 {
339         if (!req) {
340                 return;
341         }
342
343         draw_text("Selecting " + filename + "...");
344         
345         req.open("POST", "http://" + global_vhost + "/select", false);
346         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
347         req.send("mode=single&event=" + evt + "&filename=" + filename);
348
349         setTimeout("fade_text(0.99)", 30);
350 }
351
352 function key_down(which)
353 {
354         if (which == 39) {   // right
355                 if (can_go_next()) {
356                         set_opacity("next", 0.99);
357                 }
358         } else if (which == 37) {   // left
359                 if (can_go_previous()) {
360                         set_opacity("previous", 0.99);
361                 }
362         } else if (which == 27) {   // escape
363                 set_opacity("close", 0.99);
364         }
365 }
366
367 function key_up(which) {
368         if (which == 39) {   // right
369                 if (can_go_next()) {
370                         set_opacity("next", 0.7);
371                         go_next();
372                 }
373         } else if (which == 37) {   // left
374                 if (can_go_previous()) {
375                         set_opacity("previous", 0.7);
376                         go_previous();
377                 }
378         } else if (which == 27) {   // escape
379                 set_opacity("close", 0.7);
380                 do_close();
381         } else if (which == 32 && global_select) {   // space
382                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1]);
383         }
384 }
385
386 // enable the horrible horrible IE PNG hack
387 function ie_png_hack()
388 {
389         var vstr = navigator.appVersion.split("MSIE");
390         var v = parseFloat(vstr[1]);
391         if (v >= 5.5 && v < 7.0 && document.body.filters) {
392                 var next = document.getElementById("next");
393                 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); }\" />";
394                 
395                 var previous = document.getElementById("previous");
396                 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); }\" />";
397                 
398                 var close = document.getElementById("close");
399                 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);\" />";
400         }
401 }