Have slightly less irksome anchor parsing in the JavaScript.
[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 num = parseInt(window.location.hash.substr(1));
45         if (num > 1 && num <= global_image_list.length) {  // and then num != NaN
46                 return (num - 1);
47         } else {
48                 return default_value;
49         }
50 }
51
52 /*
53  * pr0n can resize to any size we'd like, but we're much more likely
54  * to have this set of fixed-resolution screens cached, so to increase
55  * performance, we round down to the closest fit and use that. This 
56  * function is a pessimal estimate of what thumbnail size we can _always_
57  * fit on the screen -- it's right if and only if all images are 4:3
58  * (and landscape). If individual size information is available, use
59  * pick_image_size, below.
60  */
61 var fixed_sizes = [
62         [ 2048, 1536 ],
63         [ 1920, 1440 ],
64         [ 1600, 1200 ],
65         [ 1400, 1050 ],
66         [ 1280, 960 ],
67         [ 1152, 864 ],
68         [ 1024, 768 ],
69         [ 800, 600 ],
70         [ 640, 480 ],
71         [ 512, 384 ],
72         [ 320, 256 ],
73         [ 240, 192 ],
74         [ 120, 96 ],
75         [ 80, 64 ]
76 ];
77 function max_image_size(screen_size)
78 {
79         var i;
80         for (i = 0; i < fixed_sizes.length; ++i) {
81                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
82                         return fixed_sizes[i];
83                 }
84         }
85         return [ 80, 64 ];
86 }
87
88 function pick_image_size(screen_size, image_size)
89 {
90         var i;
91         for (i = 0; i < fixed_sizes.length; ++i) {
92                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
93                 // inaccuracies :-)
94                 var thumbxres = fixed_sizes[i][0];
95                 var thumbyres = fixed_sizes[i][1];
96                 var width = image_size[0];
97                 var height = image_size[1];
98
99                 if (!(thumbxres >= width && thumbyres >= height)) {
100                         var sfh = width / thumbxres;
101                         var sfv = height / thumbyres;
102                         if (sfh > sfv) {
103                                 width  /= sfh;
104                                 height /= sfh;
105                         } else {
106                                 width  /= sfv;
107                                 height /= sfv;
108                         }
109                         width = Math.floor(width);
110                         height = Math.floor(height);
111                 }
112
113                 if (screen_size[0] >= width && screen_size[1] >= height) {
114                         // be sure _not_ to return a reference
115                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
116                 }
117         }
118         return [ 80, 64 ];
119 }
120
121 function replace_image_element(url, element_id, parent_node)
122 {
123         var img = document.getElementById(element_id);
124         if (img !== null) {
125                 img.src = "data:";
126                 img.parentNode.removeChild(img);
127         }
128
129         img = document.createElement("img");
130         img.id = element_id;
131         img.alt = "";
132
133         if (img.src != url) {
134                 img.src = url;
135         }
136         
137         parent_node.appendChild(img);
138         return img;
139 }
140
141 function display_image(width, height, evt, filename, element_id)
142 {
143         var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/nobox/" + filename;
144         var main = document.getElementById("iehack");
145         var img = replace_image_element(url, element_id, main);
146
147         if (global_infobox != 'nobox') {
148                 var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
149                 var boximg = replace_image_element(url, element_id + "_box", main);
150
151                 boximg.style.position = "absolute";
152                 boximg.style.left = "0px";
153                 boximg.style.bottom = "-1px";
154         }
155
156         return img;
157 }
158
159 function display_image_num(num, element_id)
160 {
161         var screen_size = find_width();
162         var adjusted_size;
163
164         if (global_image_list[num][2] == -1) {
165                 // no size information, use our pessimal guess
166                 adjusted_size = max_image_size(screen_size);
167         } else {
168                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
169         }
170
171         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
172         
173         if (element_id == "image") {
174                 // we want to shrink the box as much as possible if we know the true
175                 // size of the image
176                 center_image(num);
177                 
178                 // replace the anchor part (if any) with the image number
179                 var baseurl = (window.location.toString().split("#"))[0];
180                 window.location = baseurl + "#" + (num+1);
181         }
182
183         return img;
184 }
185
186 function prepare_preload(img, num)
187 {
188         // cancel any pending preload
189         var preload = document.getElementById("preload");
190         if (preload !== null) {
191                 preload.src = "data:";
192                 preload.parentNode.removeChild(preload);
193         }
194         
195         var preload_box = document.getElementById("preload_box");
196         if (preload_box !== null) {
197                 preload_box.src = "data:";
198                 preload_box.parentNode.removeChild(preload_box);
199         }
200
201         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
202         // completeness first; should at least be _somewhat_ better
203         if (img.complete) {
204                 display_image_num(num, "preload");
205         } else {
206                 img.onload = function() { display_image_num(num, "preload"); };
207         }       
208 }
209
210 function can_go_next()
211 {
212         return (global_image_num < global_image_list.length - 1);
213 }
214
215 function can_go_previous()
216 {
217         return (global_image_num > 0);
218 }
219
220 function set_opacity(id, amount)
221 {
222         var elem = document.getElementById(id);
223         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
224                 elem.style.opacity = amount;
225         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
226                 elem.style.mozOpacity = amount;
227         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
228                 if (elem.style.filter.indexOf("alpha") == -1) {
229                         // add an alpha filter if there isn't one already
230                         if (elem.style.filter) {
231                                 elem.style.filter += " ";
232                         } else {
233                                 elem.style.filter = "";
234                         }
235                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
236                 } else {        
237                         // ugh? this seems to break in color index mode...
238                         if (typeof(elem.filters) == 'unknown') {
239                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
240                         } else {
241                                 elem.filters.alpha.opacity = (amount * 100.0);
242                         }
243                 }
244         } else {                             // no alpha support
245                 if (amount > 0.5) {
246                         elem.style.visibility = "visible";
247                         elem.style.zorder = 1;
248                 } else {
249                         elem.style.visibility = "hidden";
250                 }
251         }
252 }
253
254 function center_image(num)
255 {
256         var screen_size = find_width();
257         var width, height;
258         
259         if (global_image_list[num][2] == -1) {
260                 // no size information, use our pessimal guess
261                 var adjusted_size = max_image_size(screen_size);
262                 width = adjusted_size[0];
263                 height = adjusted_size[1];
264         } else {
265                 // use the exact information
266                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
267                 width = adjusted_size[2];
268                 height = adjusted_size[3];
269         }
270
271         // center the image on-screen
272         var main = document.getElementById("main");
273         main.style.position = "absolute";
274         main.style.left = (screen_size[0] - width) / 2 + "px";
275         main.style.top = (screen_size[1] - height) / 2 + "px"; 
276         main.style.width = width + "px";
277         main.style.height = height + "px";
278         main.style.lineHeight = height + "px";
279 }
280
281 function relayout()
282 {
283         var img = display_image_num(global_image_num, "image");
284         if (can_go_next()) {
285                 prepare_preload(img, global_image_num + 1);
286         }
287
288         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
289         set_opacity("next", can_go_next() ? 0.7 : 0.1);
290         set_opacity("close", 0.7);
291 }
292
293 function go_previous()
294 {
295         if (!can_go_previous()) {
296                 return;
297         }
298
299         var img = display_image_num(--global_image_num, "image");
300         if (can_go_previous()) {
301                 set_opacity("previous", 0.7);
302                 prepare_preload(img, global_image_num - 1);
303         } else {
304                 set_opacity("previous", 0.1);
305         }
306         set_opacity("next", can_go_next() ? 0.7 : 0.1);
307 }
308
309 function go_next()
310 {
311         if (!can_go_next()) {
312                 return;
313         }
314
315         var img = display_image_num(++global_image_num, "image");
316         if (can_go_next()) {
317                 set_opacity("next", 0.7);
318                 prepare_preload(img, global_image_num + 1);
319         } else {
320                 set_opacity("next", 0.1);
321         }
322         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
323 }
324
325 function do_close()
326 {
327         window.location = global_return_url;
328 }
329
330 function draw_text(msg)
331 {
332         // remove any text we might have left
333         var text = document.getElementById("text");
334         if (text !== null) {
335                 text.parentNode.removeChild(text);
336         }
337
338         text = document.createElement("p");
339         text.id = "text";
340         text.style.position = "absolute";
341         text.style.color = "white";
342         text.style.lineHeight = "24px";
343         text.style.font = "24px verdana, arial, sans-serif";
344         text.innerHTML = msg;
345
346         var main = document.getElementById("main");
347         main.appendChild(text);
348
349         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
350         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
351 }
352
353 function fade_text(opacity)
354 {
355         set_opacity("text", opacity);
356         if (opacity > 0.0) {
357                 opacity -= 0.03;
358                 if (opacity < 0.0) {
359                         opacity = 0.0;
360                 }
361                 setTimeout("fade_text(" + opacity + ")", 30);
362         } else {
363                 var text = document.getElementById("text");
364                 if (text !== null) {
365                         text.parentNode.removeChild(text);
366                 }
367         }
368 }
369
370 function select_image(evt, filename)
371 {
372         if (!req) {
373                 return;
374         }
375
376         draw_text("Selecting " + filename + "...");
377         
378         req.open("POST", "http://" + global_vhost + "/select", false);
379         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
380         req.send("mode=single&event=" + evt + "&filename=" + filename);
381
382         setTimeout("fade_text(0.99)", 30);
383 }
384
385 function key_down(which)
386 {
387         if (which == 39) {   // right
388                 if (can_go_next()) {
389                         set_opacity("next", 0.99);
390                 }
391         } else if (which == 37) {   // left
392                 if (can_go_previous()) {
393                         set_opacity("previous", 0.99);
394                 }
395         } else if (which == 27) {   // escape
396                 set_opacity("close", 0.99);
397         }
398 }
399
400 function key_up(which) {
401         if (which == 39) {   // right
402                 if (can_go_next()) {
403                         set_opacity("next", 0.7);
404                         go_next();
405                 }
406         } else if (which == 37) {   // left
407                 if (can_go_previous()) {
408                         set_opacity("previous", 0.7);
409                         go_previous();
410                 }
411         } else if (which == 27) {   // escape
412                 set_opacity("close", 0.7);
413                 do_close();
414         } else if (which == 32 && global_select) {   // space
415                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1]);
416         }
417 }
418
419 // enable the horrible horrible IE PNG hack
420 function ie_png_hack()
421 {
422         var vstr = navigator.appVersion.split("MSIE");
423         var v = parseFloat(vstr[1]);
424         if (v >= 5.5 && v < 7.0 && document.body.filters) {
425                 var next = document.getElementById("next");
426                 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); }\" />";
427                 
428                 var previous = document.getElementById("previous");
429                 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); }\" />";
430                 
431                 var close = document.getElementById("close");
432                 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);\" />";
433         }
434 }