Remove hacks for pre-IE7.
[pr0n] / files / pr0n-fullscreen.js
1 var req;
2
3 function init_ajax()
4 {
5         req = new XMLHttpRequest();
6 }
7
8 function find_width()
9 {
10         var dpr = find_dpr();
11         return [window.innerWidth * dpr, window.innerHeight * dpr];
12 }
13
14 function find_dpr()
15 {
16         return window.devicePixelRatio || 1;
17 }
18
19 /*
20  * pr0n can resize to any size we'd like, but we're much more likely
21  * to have this set of fixed-resolution screens cached, so to increase
22  * performance, we round down to the closest fit and use that. This 
23  * function is a pessimal estimate of what thumbnail size we can _always_
24  * fit on the screen -- it's right if and only if all images are 4:3
25  * (and landscape). If individual size information is available, use
26  * pick_image_size, below.
27  */
28 var fixed_sizes = [
29         [ 2304, 1728 ],
30         [ 2048, 1536 ],
31         [ 1920, 1440 ],
32         [ 1600, 1200 ],
33         [ 1400, 1050 ],
34         [ 1280, 960 ],
35         [ 1152, 864 ],
36         [ 1024, 768 ],
37         [ 800, 600 ],
38         [ 640, 480 ],
39         [ 512, 384 ],
40         [ 320, 256 ],
41         [ 240, 192 ],
42         [ 120, 96 ],
43         [ 80, 64 ]
44 ];
45 function max_image_size(screen_size)
46 {
47         var i;
48         for (i = 0; i < fixed_sizes.length; ++i) {
49                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
50                         return fixed_sizes[i];
51                 }
52         }
53         return [ 80, 64 ];
54 }
55
56 function pick_image_size(screen_size, image_size)
57 {
58         var i;
59         for (i = 0; i < fixed_sizes.length; ++i) {
60                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
61                 // inaccuracies :-)
62                 var thumbxres = fixed_sizes[i][0];
63                 var thumbyres = fixed_sizes[i][1];
64                 var width = image_size[0];
65                 var height = image_size[1];
66
67                 if (!(thumbxres >= width && thumbyres >= height)) {
68                         var sfh = width / thumbxres;
69                         var sfv = height / thumbyres;
70                         if (sfh > sfv) {
71                                 width  /= sfh;
72                                 height /= sfh;
73                         } else {
74                                 width  /= sfv;
75                                 height /= sfv;
76                         }
77                         width = Math.floor(width);
78                         height = Math.floor(height);
79                 }
80
81                 if (screen_size[0] >= width && screen_size[1] >= height) {
82                         // be sure _not_ to return a reference
83                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
84                 }
85         }
86         return [ 80, 64 ];
87 }
88
89 function replace_image_element(url, element_id, parent_node)
90 {
91         var img = document.getElementById(element_id);
92         if (img !== null) {
93                 if (img.src === url) {
94                         return img;
95                 }
96                 img.parentNode.removeChild(img);
97         }
98
99         img = document.createElement("img");
100         img.id = element_id;
101         img.alt = "";
102         img.src = url;
103         parent_node.appendChild(img);
104         return img;
105 }
106
107 function rename_element(old_name, new_name)
108 {
109         // Remove any element that's in the way.
110         var elem = document.getElementById(new_name);
111         if (elem !== null) {
112                 elem.parentNode.removeChild(elem);
113         }
114
115         elem = document.getElementById(old_name);
116         if (elem !== null) {
117                 elem.id = new_name;
118         }
119         return elem;
120 }
121
122 function display_image(width, height, evt, filename, element_id)
123 {
124         var url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/nobox/" + filename;
125         var main = document.getElementById("iehack");
126         var preload = document.getElementById("preload");
127         var dpr = find_dpr();
128         var img;
129         // See if we have a preload going on that we can reuse.
130         if (element_id == "image" && preload !== null && preload.src == url) {
131                 rename_element("preload_box", "image_box");
132                 img = rename_element("preload", "image");
133         } else {
134                 img = replace_image_element(url, element_id, main);
135         }
136         img.style.position = "absolute";
137         img.style.left = "0px";
138         img.style.top = "0px";
139         img.style.transformOrigin = "top left";
140         img.style.transform = "scale(" + (1.0 / dpr) + ")";
141
142         // Infobox.
143         var url;
144         if (dpr == 1) {
145                 url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
146         } else {
147                 url = window.location.origin + "/" + evt + "/" + width + "x" + height + "@" + dpr.toFixed(2) + "/box/" + filename;
148         }
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         boximg.style.transformOrigin = "bottom left";
155         boximg.style.transform = "scale(" + (1.0 / dpr) + ")";
156
157         return img;
158 }
159
160 function display_image_num(num, element_id)
161 {
162         var screen_size = find_width();
163         var adjusted_size;
164
165         if (global_image_list[num][2] == -1) {
166                 // no size information, use our pessimal guess
167                 adjusted_size = max_image_size(screen_size);
168         } else {
169                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
170         }
171
172         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
173         
174         if (element_id == "image") {
175                 // we want to shrink the box as much as possible if we know the true
176                 // size of the image
177                 center_image(num);
178                 
179                 // replace the anchor part (if any) with the image number
180                 window.location.hash = "#" + (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.parentNode.removeChild(preload);
192         }
193         
194         var preload_box = document.getElementById("preload_box");
195         if (preload_box !== null) {
196                 preload_box.parentNode.removeChild(preload_box);
197         }
198
199         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
200         // completeness first; should at least be _somewhat_ better
201         if (img.complete) {
202                 display_image_num(num, "preload");
203         } else {
204                 img.onload = function() { display_image_num(num, "preload"); };
205         }       
206 }
207
208 function can_go_next()
209 {
210         return (global_image_num < global_image_list.length - 1);
211 }
212
213 function can_go_previous()
214 {
215         return (global_image_num > 0);
216 }
217
218 function set_opacity(id, amount)
219 {
220         var elem = document.getElementById(id);
221         if (typeof(elem.style.opacity) != 'undefined') {            // W3C
222                 elem.style.opacity = amount;
223         } else if (typeof(elem.style.mozOpacity) != 'undefined') {  // older Mozilla
224                 elem.style.mozOpacity = amount;
225         } else if (typeof(elem.style.filter) != 'undefined') {      // IE
226                 if (elem.style.filter.indexOf("alpha") == -1) {
227                         // add an alpha filter if there isn't one already
228                         if (elem.style.filter) {
229                                 elem.style.filter += " ";
230                         } else {
231                                 elem.style.filter = "";
232                         }
233                         elem.style.filter += "alpha(opacity=" + (amount*100.0) + ")";
234                 } else {        
235                         // ugh? this seems to break in color index mode...
236                         if (typeof(elem.filters) == 'unknown') {
237                                 elem.style.filter = "alpha(opacity=" + (amount*100.0) + ")";
238                         } else {
239                                 elem.filters.alpha.opacity = (amount * 100.0);
240                         }
241                 }
242         } else {                             // no alpha support
243                 if (amount > 0.5) {
244                         elem.style.visibility = "visible";
245                         elem.style.zorder = 1;
246                 } else {
247                         elem.style.visibility = "hidden";
248                 }
249         }
250 }
251
252 function center_image(num)
253 {
254         var screen_size = find_width();
255         var dpr = find_dpr();
256         var width, height;
257         
258         if (global_image_list[num][2] == -1) {
259                 // no size information, use our pessimal guess
260                 var adjusted_size = max_image_size(screen_size);
261                 width = adjusted_size[0];
262                 height = adjusted_size[1];
263         } else {
264                 // use the exact information
265                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
266                 width = adjusted_size[2];
267                 height = adjusted_size[3];
268         }
269
270         // center the image on-screen
271         var main = document.getElementById("main");
272         main.style.position = "absolute";
273         main.style.left = (((screen_size[0] - width) / 2) / dpr) + "px";
274         main.style.top = (((screen_size[1] - height) / 2) / dpr) + "px";
275         main.style.width = (width / dpr) + "px";
276         main.style.height = (height / dpr) + "px";
277         main.style.lineHeight = (height / dpr) + "px";
278 }
279
280 function relayout()
281 {
282         var img = display_image_num(global_image_num, "image");
283         if (can_go_next()) {
284                 prepare_preload(img, global_image_num + 1);
285         }
286
287         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
288         set_opacity("next", can_go_next() ? 0.7 : 0.1);
289         set_opacity("close", 0.7);
290 }
291
292 function go_previous()
293 {
294         if (!can_go_previous()) {
295                 return;
296         }
297
298         var img = display_image_num(--global_image_num, "image");
299         if (can_go_previous()) {
300                 set_opacity("previous", 0.7);
301                 prepare_preload(img, global_image_num - 1);
302         } else {
303                 set_opacity("previous", 0.1);
304         }
305         set_opacity("next", can_go_next() ? 0.7 : 0.1);
306 }
307
308 function go_next()
309 {
310         if (!can_go_next()) {
311                 return;
312         }
313
314         var img = display_image_num(++global_image_num, "image");
315         if (can_go_next()) {
316                 set_opacity("next", 0.7);
317                 prepare_preload(img, global_image_num + 1);
318         } else {
319                 set_opacity("next", 0.1);
320         }
321         set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
322 }
323
324 function do_close()
325 {
326         window.location = global_return_url;
327 }
328
329 function draw_text(msg)
330 {
331         // remove any text we might have left
332         var text = document.getElementById("text");
333         if (text !== null) {
334                 text.parentNode.removeChild(text);
335         }
336
337         text = document.createElement("p");
338         text.id = "text";
339         text.style.position = "absolute";
340         text.style.color = "white";
341         text.style.lineHeight = "24px";
342         text.style.font = "24px verdana, arial, sans-serif";
343         text.innerHTML = msg;
344
345         var main = document.getElementById("main");
346         main.appendChild(text);
347
348         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
349         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
350 }
351
352 function fade_text(opacity)
353 {
354         set_opacity("text", opacity);
355         if (opacity > 0.0) {
356                 opacity -= 0.03;
357                 if (opacity < 0.0) {
358                         opacity = 0.0;
359                 }
360                 setTimeout("fade_text(" + opacity + ")", 30);
361         } else {
362                 var text = document.getElementById("text");
363                 if (text !== null) {
364                         text.parentNode.removeChild(text);
365                 }
366         }
367 }
368
369 function select_image(evt, filename, selected)
370 {
371         if (!req) {
372                 return;
373         }
374
375         if (selected) {
376                 draw_text("Selecting " + filename + "...");
377         } else {
378                 draw_text("Unselecting " + filename + "...");
379         }
380         
381         req.open("POST", window.location.origin + "/select", false);
382         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
383         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
384
385         setTimeout("fade_text(0.99)", 30);
386 }
387
388 function key_down(which)
389 {
390         if (which == 39) {   // right
391                 if (can_go_next()) {
392                         set_opacity("next", 0.99);
393                 }
394         } else if (which == 37) {   // left
395                 if (can_go_previous()) {
396                         set_opacity("previous", 0.99);
397                 }
398         } else if (which == 27) {   // escape
399                 set_opacity("close", 0.99);
400         } else {
401                 check_for_hash_change();
402         }
403 }
404
405 function key_up(which) {
406         if (which == 39) {   // right
407                 if (can_go_next()) {
408                         set_opacity("next", 0.7);
409                         go_next();
410                 }
411         } else if (which == 37) {   // left
412                 if (can_go_previous()) {
413                         set_opacity("previous", 0.7);
414                         go_previous();
415                 }
416         } else if (which == 27) {   // escape
417                 set_opacity("close", 0.7);
418                 do_close();
419         } else if (which == 32 && global_select) {   // space
420                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
421         } else if (which == 85 && global_select) {   // u
422                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
423         } else {
424                 check_for_hash_change();
425         }
426 }
427
428 function parse_image_num(default_value) {
429         var num = parseInt(window.location.hash.substr(1));
430         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
431                 return (num - 1);
432         } else {
433                 return default_value;
434         }
435 }
436
437 function check_for_hash_change() {
438         var num = parse_image_num(-1);
439         if (num != -1 && num != global_image_num) {
440                 global_image_num = num;
441                 relayout();
442         }
443 }