Make the fullscreen view use the new box-only cache.
[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 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         [ 1152, 864 ],
71         [ 1024, 768 ],
72         [ 800, 600 ],
73         [ 640, 480 ],
74         [ 512, 384 ],
75         [ 320, 256 ],
76         [ 240, 192 ],
77         [ 120, 96 ],
78         [ 80, 64 ]
79 ];
80 function max_image_size(screen_size)
81 {
82         var i;
83         for (i = 0; i < fixed_sizes.length; ++i) {
84                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
85                         return fixed_sizes[i];
86                 }
87         }
88         return [ 80, 64 ];
89 }
90
91 function pick_image_size(screen_size, image_size)
92 {
93         var i;
94         for (i = 0; i < fixed_sizes.length; ++i) {
95                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
96                 // inaccuracies :-)
97                 var thumbxres = fixed_sizes[i][0];
98                 var thumbyres = fixed_sizes[i][1];
99                 var width = image_size[0];
100                 var height = image_size[1];
101
102                 if (!(thumbxres >= width && thumbyres >= height)) {
103                         var sfh = width / thumbxres;
104                         var sfv = height / thumbyres;
105                         if (sfh > sfv) {
106                                 width  /= sfh;
107                                 height /= sfh;
108                         } else {
109                                 width  /= sfv;
110                                 height /= sfv;
111                         }
112                         width = Math.floor(width);
113                         height = Math.floor(height);
114                 }
115
116                 if (screen_size[0] >= width && screen_size[1] >= height) {
117                         // be sure _not_ to return a reference
118                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
119                 }
120         }
121         return [ 80, 64 ];
122 }
123
124 function replace_image_element(url, element_id, parent_node)
125 {
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         parent_node.appendChild(img);
141         return img;
142 }
143
144 function display_image(width, height, evt, filename, element_id)
145 {
146         var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/nobox/" + filename;
147         var main = document.getElementById("iehack");
148         var img = replace_image_element(url, element_id, main);
149
150         if (global_infobox != 'nobox') {
151                 var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
152                 var boximg = replace_image_element(url, element_id + "_box", main);
153
154                 boximg.style.position = "absolute";
155                 boximg.style.left = "0px";
156                 boximg.style.bottom = "-1px";
157         }
158
159         return img;
160 }
161
162 function display_image_num(num, element_id)
163 {
164         var screen_size = find_width();
165         var adjusted_size;
166
167         if (global_image_list[num][2] == -1) {
168                 // no size information, use our pessimal guess
169                 adjusted_size = max_image_size(screen_size);
170         } else {
171                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
172         }
173
174         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
175         
176         if (element_id == "image") {
177                 // we want to shrink the box as much as possible if we know the true
178                 // size of the image
179                 center_image(num);
180                 
181                 // replace the anchor part (if any) with the image number
182                 var baseurl = (window.location.toString().split("#"))[0];
183                 window.location = baseurl + "#" + (num+1);
184         }
185
186         return img;
187 }
188
189 function prepare_preload(img, num)
190 {
191         // cancel any pending preload
192         var preload = document.getElementById("preload");
193         if (preload !== null) {
194                 preload.src = "data:";
195                 preload.parentNode.removeChild(preload);
196         }
197
198         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
199         // completeness first; should at least be _somewhat_ better
200         if (img.complete) {
201                 display_image_num(num, "preload");
202         } else {
203                 img.onload = function() { display_image_num(num, "preload"); };
204         }       
205 }
206
207 function can_go_next()
208 {
209         return (global_image_num < global_image_list.length - 1);
210 }
211
212 function can_go_previous()
213 {
214         return (global_image_num > 0);
215 }
216
217 function set_opacity(id, amount)
218 {
219         var elem = document.getElementById(id);
220         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
221                 elem.style.opacity = amount;
222         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
223                 elem.style.mozOpacity = amount;
224         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
225                 if (elem.style.filter.indexOf("alpha") == -1) {
226                         // add an alpha filter if there isn't one already
227                         if (elem.style.filter) {
228                                 elem.style.filter += " ";
229                         } else {
230                                 elem.style.filter = "";
231                         }
232                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
233                 } else {        
234                         // ugh? this seems to break in color index mode...
235                         if (typeof(elem.filters) == 'unknown') {
236                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
237                         } else {
238                                 elem.filters.alpha.opacity = (amount * 100.0);
239                         }
240                 }
241         } else {                             // no alpha support
242                 if (amount > 0.5) {
243                         elem.style.visibility = "visible";
244                         elem.style.zorder = 1;
245                 } else {
246                         elem.style.visibility = "hidden";
247                 }
248         }
249 }
250
251 function center_image(num)
252 {
253         var screen_size = find_width();
254         var width, height;
255         
256         if (global_image_list[num][2] == -1) {
257                 // no size information, use our pessimal guess
258                 var adjusted_size = max_image_size(screen_size);
259                 width = adjusted_size[0];
260                 height = adjusted_size[1];
261         } else {
262                 // use the exact information
263                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
264                 width = adjusted_size[2];
265                 height = adjusted_size[3];
266         }
267
268         // center the image on-screen
269         var main = document.getElementById("main");
270         main.style.position = "absolute";
271         main.style.left = (screen_size[0] - width) / 2 + "px";
272         main.style.top = (screen_size[1] - height) / 2 + "px"; 
273         main.style.width = width + "px";
274         main.style.height = height + "px";
275         main.style.lineHeight = height + "px";
276 }
277
278 function relayout()
279 {
280         var img = display_image_num(global_image_num, "image");
281         if (can_go_next()) {
282                 prepare_preload(img, global_image_num + 1);
283         }
284
285         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
286         set_opacity("next", can_go_next() ? 0.7 : 0.1);
287         set_opacity("close", 0.7);
288 }
289
290 function go_previous()
291 {
292         if (!can_go_previous()) {
293                 return;
294         }
295
296         var img = display_image_num(--global_image_num, "image");
297         if (can_go_previous()) {
298                 set_opacity("previous", 0.7);
299                 prepare_preload(img, global_image_num - 1);
300         } else {
301                 set_opacity("previous", 0.1);
302         }
303         set_opacity("next", can_go_next() ? 0.7 : 0.1);
304 }
305
306 function go_next()
307 {
308         if (!can_go_next()) {
309                 return;
310         }
311
312         var img = display_image_num(++global_image_num, "image");
313         if (can_go_next()) {
314                 set_opacity("next", 0.7);
315                 prepare_preload(img, global_image_num + 1);
316         } else {
317                 set_opacity("next", 0.1);
318         }
319         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
320 }
321
322 function do_close()
323 {
324         window.location = global_return_url;
325 }
326
327 function draw_text(msg)
328 {
329         // remove any text we might have left
330         var text = document.getElementById("text");
331         if (text !== null) {
332                 text.parentNode.removeChild(text);
333         }
334
335         text = document.createElement("p");
336         text.id = "text";
337         text.style.position = "absolute";
338         text.style.color = "white";
339         text.style.lineHeight = "24px";
340         text.style.font = "24px verdana, arial, sans-serif";
341         text.innerHTML = msg;
342
343         var main = document.getElementById("main");
344         main.appendChild(text);
345
346         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
347         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
348 }
349
350 function fade_text(opacity)
351 {
352         set_opacity("text", opacity);
353         if (opacity > 0.0) {
354                 opacity -= 0.03;
355                 if (opacity < 0.0) {
356                         opacity = 0.0;
357                 }
358                 setTimeout("fade_text(" + opacity + ")", 30);
359         } else {
360                 var text = document.getElementById("text");
361                 if (text !== null) {
362                         text.parentNode.removeChild(text);
363                 }
364         }
365 }
366
367 function select_image(evt, filename)
368 {
369         if (!req) {
370                 return;
371         }
372
373         draw_text("Selecting " + filename + "...");
374         
375         req.open("POST", "http://" + global_vhost + "/select", false);
376         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
377         req.send("mode=single&event=" + evt + "&filename=" + filename);
378
379         setTimeout("fade_text(0.99)", 30);
380 }
381
382 function key_down(which)
383 {
384         if (which == 39) {   // right
385                 if (can_go_next()) {
386                         set_opacity("next", 0.99);
387                 }
388         } else if (which == 37) {   // left
389                 if (can_go_previous()) {
390                         set_opacity("previous", 0.99);
391                 }
392         } else if (which == 27) {   // escape
393                 set_opacity("close", 0.99);
394         }
395 }
396
397 function key_up(which) {
398         if (which == 39) {   // right
399                 if (can_go_next()) {
400                         set_opacity("next", 0.7);
401                         go_next();
402                 }
403         } else if (which == 37) {   // left
404                 if (can_go_previous()) {
405                         set_opacity("previous", 0.7);
406                         go_previous();
407                 }
408         } else if (which == 27) {   // escape
409                 set_opacity("close", 0.7);
410                 do_close();
411         } else if (which == 32 && global_select) {   // space
412                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1]);
413         }
414 }
415
416 // enable the horrible horrible IE PNG hack
417 function ie_png_hack()
418 {
419         var vstr = navigator.appVersion.split("MSIE");
420         var v = parseFloat(vstr[1]);
421         if (v >= 5.5 && v < 7.0 && document.body.filters) {
422                 var next = document.getElementById("next");
423                 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); }\" />";
424                 
425                 var previous = document.getElementById("previous");
426                 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); }\" />";
427                 
428                 var close = document.getElementById("close");
429                 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);\" />";
430         }
431 }