14b080d5d830766750c0c9ac69b14dba4f11beff
[pr0n] / files / pr0n-fullscreen.js
1 (function() {
2
3 var global_disabled_opacity = 0.1;
4 var global_default_opacity = 0.7;
5 var global_highlight_opacity = 1.0;
6 var global_infobox = true;
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         [ 3840, 2880 ],
30         [ 3200, 2400 ],
31         [ 2800, 2100 ],
32         [ 2304, 1728 ],
33         [ 2048, 1536 ],
34         [ 1920, 1440 ],
35         [ 1600, 1200 ],
36         [ 1400, 1050 ],
37         [ 1280, 960 ],
38         [ 1152, 864 ],
39         [ 1024, 768 ],
40         [ 800, 600 ],
41         [ 640, 480 ],
42         [ 512, 384 ],
43         [ 320, 256 ],
44         [ 240, 192 ],
45         [ 120, 96 ],
46         [ 80, 64 ]
47 ];
48 function max_image_size(screen_size)
49 {
50         var i;
51         for (i = 0; i < fixed_sizes.length; ++i) {
52                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
53                         return fixed_sizes[i];
54                 }
55         }
56         return [ 80, 64 ];
57 }
58
59 function pick_image_size(screen_size, image_size)
60 {
61         var i;
62         for (i = 0; i < fixed_sizes.length; ++i) {
63                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
64                 // inaccuracies :-)
65                 var thumbxres = fixed_sizes[i][0];
66                 var thumbyres = fixed_sizes[i][1];
67                 var width = image_size[0];
68                 var height = image_size[1];
69
70                 if (!(thumbxres >= width && thumbyres >= height)) {
71                         var sfh = width / thumbxres;
72                         var sfv = height / thumbyres;
73                         if (sfh > sfv) {
74                                 width  /= sfh;
75                                 height /= sfh;
76                         } else {
77                                 width  /= sfv;
78                                 height /= sfv;
79                         }
80                         width = Math.floor(width);
81                         height = Math.floor(height);
82                 }
83
84                 if (screen_size[0] >= width && screen_size[1] >= height) {
85                         // be sure _not_ to return a reference
86                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
87                 }
88         }
89         return [ 80, 64 ];
90 }
91
92 function rename_element(old_name, new_name)
93 {
94         // Remove any element that's in the way.
95         var elem = document.getElementById(new_name);
96         if (elem !== null) {
97                 elem.parentNode.removeChild(elem);
98         }
99
100         elem = document.getElementById(old_name);
101         if (elem !== null) {
102                 elem.id = new_name;
103         }
104         return elem;
105 }
106
107 function display_image(url, backend_width, backend_height, elem_id, offset, preload)
108 {
109         // See if this image already exists in the DOM; if not, add it.
110         var img = document.getElementById(elem_id);
111         if (img === null) {
112                 img = document.createElement("img");
113                 img.id = elem_id;
114                 img.alt = "";
115                 img.className = preload ? "fsbox" : "fsimg";
116         }
117         img.style.position = "absolute";
118         img.style.transformOrigin = "top left";
119         document.getElementById("main").appendChild(img);
120
121         if (offset === 0) {
122                 img.src = url;
123                 position_image(img, backend_width, backend_height, offset, preload);
124         } else {
125                 // This is a preload, so wait for the main image to be ready.
126                 // The test for .complete is an old IE hack, which I don't know if is relevant anymore.
127                 var main_img = document.getElementById(global_image_num);
128                 if (main_img === null || main_img.complete) {
129                         img.src = url;
130                 } else {
131                         main_img.addEventListener('load', function() { img.src = url; }, false);
132                 }
133
134                 // Seemingly one needs to delay position_image(), or Firefox will set the initial
135                 // scroll offset completely off.
136                 img.style.display = 'none';
137                 setTimeout(function() { position_image(img, backend_width, backend_height, offset, preload); img.style.display = null; }, 1);
138         }
139 }
140
141 function display_image_num(num, offset)
142 {
143         var screen_size = find_width();
144         var adjusted_size;
145
146         if (global_image_list[num][2] == -1) {
147                 // no size information, use our pessimal guess
148                 adjusted_size = max_image_size(screen_size);
149         } else {
150                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
151         }
152
153         var evt = global_image_list[num][0];
154         var filename = global_image_list[num][1];
155         var backend_width = adjusted_size[0];
156         var backend_height = adjusted_size[1];
157         var url = window.location.origin + "/" + evt + "/" + backend_width + "x" + backend_height + "/" + filename;
158         var elem_id = num;
159
160         display_image(url, adjusted_size[2], adjusted_size[3], elem_id, offset, false);
161
162         if (global_infobox) {
163                 var url;
164                 var dpr = find_dpr();
165                 var elem_id = num + "_box";
166                 if (dpr == 1) {
167                         url = window.location.origin + "/" + evt + "/" + backend_width + "x" + backend_height + "/box/" + filename;
168                 } else {
169                         url = window.location.origin + "/" + evt + "/" + backend_width + "x" + backend_height + "@" + dpr.toFixed(2) + "/box/" + filename;
170                 }
171                 display_image(url, adjusted_size[2], adjusted_size[3], elem_id, offset, true);
172         }
173
174         if (offset === 0) {
175                 // Update the "download original" link.
176                 var original_url = window.location.origin + "/" + evt + "/original/" + filename;
177                 document.getElementById("origdownload").href = original_url;
178
179                 // If it's a raw image, show a JPEG link.
180                 var fulldownload = document.getElementById("fulldownload");
181                 if (filename.match(/\.(nef|cr2)$/i)) {
182                         fulldownload.style.display = "block";
183                         var full_url = window.location.origin + "/" + evt + "/" + filename;
184                         document.getElementById("fulldownloadlink").href = full_url;
185                         origdownload.innerHTML = "Download original image (RAW)";
186                 } else {
187                         fulldownload.style.display = "none";
188                         origdownload.innerHTML = "Download original image";
189                 }
190
191                 // replace the anchor part (if any) with the image number
192                 window.location.hash = "#" + (num+1);
193         }
194 }
195
196 function can_go_next()
197 {
198         return (global_image_num < global_image_list.length - 1);
199 }
200
201 function can_go_previous()
202 {
203         return (global_image_num > 0);
204 }
205
206 function set_opacity(id, amount)
207 {
208         var elem = document.getElementById(id);
209
210         // If optionmenu is visible, options is also visible.
211         if (id === "options" && amount < 0.7) {
212                 var optionmenu = document.getElementById("optionmenu");
213                 if (optionmenu.style.display === "block") {
214                         amount = 0.7;
215                 }
216         }
217         elem.style.opacity = amount;
218 }
219
220 function position_image(img, backend_width, backend_height, offset, preload)
221 {
222         var screen_size = find_width();
223         var dpr = find_dpr();
224         var width, height;
225
226         if (backend_width == -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, [ backend_width, backend_height ]);
234                 width = adjusted_size[2];
235                 height = adjusted_size[3];
236         }
237
238         var extra_x_offset = find_width()[0] * offset;
239         var left = (screen_size[0] - width) / 2;
240         var top = (screen_size[1] - height) / 2;
241
242         if (global_infobox) top -= dpr * (24/2);
243
244         // center the image on-screen
245         img.style.position = "absolute";
246         img.style.left = (left / dpr) + "px";
247         img.style.transform = "translate(" + extra_x_offset + "px,0px)";
248
249         if (preload) {
250                 img.style.top = (top + height) / dpr + "px";
251         } else {
252                 img.style.top = (top / dpr) + "px";
253                 img.style.lineHeight = (height / dpr) + "px";
254                 img.style.width = (width / dpr) + "px";
255                 img.style.height = (height / dpr) + "px";
256         }
257 }
258
259 function update_shown_images()
260 {
261         // Go through and remove all the elements that are not supposed to be there.
262         var main = document.getElementById("main");
263         var children = main.children;
264         var to_remove = [];
265         for (var i = 0; i < children.length; i++) {
266                 var child = children[i];
267                 var inum = null;
268                 if (child.className === "fsimg") {
269                         inum = parseInt(child.id);
270                 } else if (child.className === "fsbox") {
271                         inum = parseInt(child.id.replace("_box", ""));
272                 } else {
273                         continue;
274                 }
275
276                 // FIXME: For whatever reason, if we don't actually remove an item
277                 // and then scroll it out of view, Chrome scrolls to it.
278                 // So don't keep anything that's going to be a preload;
279                 // we'll have to recreate the element entirely.
280                 //if (inum !== global_image_num - 1 &&
281                 //    inum !== global_image_num &&
282                 //    inum !== global_image_num + 1) {
283                 //      to_remove.push(child);
284                 //}
285                 if (inum !== global_image_num) {
286                         to_remove.push(child);
287                 }
288         }
289         for (let child of to_remove) {
290                 child.parentNode.removeChild(child);
291         }
292
293         // Add any missing elements. Note that we add the main one first,
294         // so that the preloads have an element to fire onload off of.
295         display_image_num(global_image_num, 0);
296         if (can_go_previous()) {
297                 display_image_num(global_image_num - 1, -1);
298         }
299         if (can_go_next()) {
300                 display_image_num(global_image_num + 1, 1);
301         }
302 }
303
304 function relayout()
305 {
306         update_shown_images();
307
308         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
309         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
310         set_opacity("close", global_default_opacity);
311         set_opacity("options", global_default_opacity);
312 }
313
314 function go_previous()
315 {
316         if (!can_go_previous()) {
317                 return;
318         }
319
320         --global_image_num;
321         update_shown_images();
322         if (can_go_previous()) {
323                 set_opacity("previous", global_default_opacity);
324         } else {
325                 set_opacity("previous", global_disabled_opacity);
326         }
327         set_opacity("next", can_go_next() ? global_default_opacity : global_disabled_opacity);
328 }
329
330 function go_next()
331 {
332         if (!can_go_next()) {
333                 return;
334         }
335
336         ++global_image_num;
337         update_shown_images();
338         if (can_go_next()) {
339                 set_opacity("next", global_default_opacity);
340         } else {
341                 set_opacity("next", global_disabled_opacity);
342         }
343         set_opacity("previous", can_go_previous() ? global_default_opacity : global_disabled_opacity);
344 }
345
346 function do_close()
347 {
348         if (global_image_num > 0) {
349                 window.location = global_return_url + '#' + (global_image_num + 1);
350         } else {
351                 window.location = global_return_url;
352         }
353 }
354
355 function toggle_optionmenu()
356 {
357         var optionmenu = document.getElementById("optionmenu");
358         if (optionmenu.style.display === "block") {
359                 optionmenu.style.display = "none";
360         } else {
361                 optionmenu.style.display = "block";
362                 set_opacity("options", 0.7);
363         }
364 }
365 window['toggle_optionmenu'] = toggle_optionmenu;
366
367 function draw_text(msg)
368 {
369         // remove any text we might have left
370         var text = document.getElementById("text");
371         if (text !== null) {
372                 text.parentNode.removeChild(text);
373         }
374
375         text = document.createElement("p");
376         text.id = "text";
377         text.style.position = "absolute";
378         text.style.color = "white";
379         text.style.lineHeight = "24px";
380         text.style.font = "24px verdana, arial, sans-serif";
381         text.innerHTML = msg;
382
383         var main = document.getElementById("main");
384         main.appendChild(text);
385
386         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
387         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
388 }
389
390 function fade_text(opacity)
391 {
392         set_opacity("text", opacity);
393         if (opacity > 0.0) {
394                 opacity -= 0.03;
395                 if (opacity < 0.0) {
396                         opacity = 0.0;
397                 }
398                 setTimeout(function() { fade_text(opacity); }, 30);
399         } else {
400                 var text = document.getElementById("text");
401                 if (text !== null) {
402                         text.parentNode.removeChild(text);
403                 }
404         }
405 }
406
407 function select_image(evt, filename, selected)
408 {
409         if (selected) {
410                 draw_text("Selecting " + filename + "...");
411         } else {
412                 draw_text("Unselecting " + filename + "...");
413         }
414         
415         var req = new XMLHttpRequest();
416         req.open("POST", window.location.origin + "/select", false);
417         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
418         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
419
420         setTimeout(function() { fade_text(0.99); }, 30);
421 }
422
423 function key_down(which)
424 {
425         if (which == 39) {   // right
426                 if (can_go_next()) {
427                         set_opacity("next", global_highlight_opacity);
428                 }
429         } else if (which == 37) {   // left
430                 if (can_go_previous()) {
431                         set_opacity("previous", global_highlight_opacity);
432                 }
433         } else if (which == 27) {   // escape
434                 set_opacity("close", global_higlight_opacity);
435         } else {
436                 check_for_hash_change();
437         }
438 }
439
440 function key_up(which) {
441         if (which == 39) {   // right
442                 if (can_go_next()) {
443                         set_opacity("next", global_default_opacity);
444                         go_next();
445                 }
446         } else if (which == 37) {   // left
447                 if (can_go_previous()) {
448                         set_opacity("previous", global_default_opacity);
449                         go_previous();
450                 }
451         } else if (which == 27) {   // escape
452                 set_opacity("close", global_default_opacity);
453                 do_close();
454         } else if (which == 32 && global_select) {   // space
455                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
456         } else if (which == 85 && global_select) {   // u
457                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
458         } else {
459                 check_for_hash_change();
460         }
461 }
462
463 function parse_image_num(default_value) {
464         var num = parseInt(window.location.hash.substr(1));
465         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
466                 return (num - 1);
467         } else {
468                 return default_value;
469         }
470 }
471 window['parse_image_num'] = parse_image_num;
472
473 function check_for_hash_change() {
474         var num = parse_image_num(-1);
475         if (num != -1 && num != global_image_num) {
476                 global_image_num = num;
477                 relayout();
478         }
479 }
480
481 function toggle_immersive() {
482         if (global_default_opacity == 0.7) {
483                 global_disabled_opacity = 0.0;
484                 global_default_opacity = 0.0;
485                 global_highlight_opacity = 0.2;
486                 global_infobox = false;
487                 document.getElementById('immersivetoggle').innerHTML = 'Show decorations';
488         } else {
489                 global_disabled_opacity = 0.1;
490                 global_default_opacity = 0.7;
491                 global_highlight_opacity = 1.0;
492                 global_infobox = true;
493                 document.getElementById('immersivetoggle').innerHTML = 'Hide all decorations';
494         }
495         relayout();
496 }
497 window['toggle_immersive'] = toggle_immersive;
498
499 window.onload = function() {
500         relayout();
501         setInterval(check_for_hash_change, 1000);
502
503         var body = document.body;
504         body.onresize = function() { relayout(); };
505         body.onkeydown = function(evt) { key_down(evt.keyCode); };
506         body.onkeyup = function(evt) { key_up(evt.keyCode); };
507         body.onhashchange = function() { check_for_hash_change(); };
508         body.onclick = function() { check_for_hash_change(); };
509
510         var previous = document.getElementById('previous');
511         previous.onmousedown = function() { if (can_go_previous()) { set_opacity('previous', global_highlight_opacity); } };
512         previous.onmouseup = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); go_previous(); } };
513         previous.onmouseout = function() { if (can_go_previous()) { set_opacity('previous', global_default_opacity); } };
514
515         var next = document.getElementById('next');
516         next.onmousedown = function() { if (can_go_next()) { set_opacity('next', global_highlight_opacity); } };
517         next.onmouseup = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); go_next(); } };
518         next.onmouseout = function() { if (can_go_next()) { set_opacity('next', global_default_opacity); } };
519
520         var close = document.getElementById('close');
521         close.onmousedown = function() { set_opacity('close', global_highlight_opacity); };
522         close.onmouseup = function() { set_opacity('close', global_default_opacity); do_close(); };
523         close.onmouseout = function() { set_opacity('close', global_default_opacity); };
524
525         var options = document.getElementById('options');
526         options.onmousedown = function() { set_opacity('options', global_highlight_opacity); };
527         options.onmouseup = function() { set_opacity('options', global_default_opacity); toggle_optionmenu(); };
528         options.onmouseout = function() { set_opacity('options', global_default_opacity); };
529 };
530
531 })();