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/* Simple image viewer widget. Usage:
*
* <a href="full_image.jpg" rel="iv:{width}x{height}:{category}">..</a>
*
* Clicking on the above link will cause the image viewer to open
* full_image.jpg. The {category} part can be empty or absent. If it is not
* empty, next/previous links will show up to point to the other images within
* the same category.
*
* ivInit() should be called when links with "iv:" tags are dynamically added
* or removed from the DOM.
*/
// Cache of image categories and the list of associated link objects. Used to
// quickly generate the next/prev links.
var cats;
function init() {
cats = {};
var n = 0;
var l = byName('a');
for(var i=0;i<l.length;i++) {
var o = l[i];
if(o.rel.substr(0,3) == 'iv:' && o.id != 'ivprev' && o.id != 'ivnext') {
n++;
o.onclick = show;
var cat = o.rel.split(':')[2];
if(cat) {
if(!cats[cat])
cats[cat] = [];
o.iv_i = cats[cat].length;
cats[cat].push(o);
}
}
}
if(n && !byId('iv_view')) {
addBody(tag('div', {id: 'iv_view','class':'hidden'},
tag('b', {id:'ivimg'}, ''),
tag('br', null),
tag('a', {href:'#', id:'ivfull'}, ''),
tag('a', {href:'#', onclick: close, id:'ivclose'}, mt('_js_close')),
tag('a', {href:'#', onclick: show, id:'ivprev'}, '« '+mt('_js_iv_prev')),
tag('a', {href:'#', onclick: show, id:'ivnext'}, mt('_js_iv_next')+' »')
));
addBody(tag('b', {id:'ivimgload','class':'hidden'}, mt('_js_loading')));
}
}
// Find the next (dir=1) or previous (dir=-1) non-hidden link object for the category.
function findnav(cat, i, dir) {
for(var j=i+dir; j>=0 && j<cats[cat].length; j+=dir)
if(!hasClass(cats[cat][j], 'hidden'))
return cats[cat][j];
return 0
}
// fix properties of the prev/next links
function fixnav(lnk, cat, i, dir) {
var a = cat ? findnav(cat, i, dir) : 0;
lnk.style.visibility = a ? 'visible' : 'hidden';
lnk.href = a ? a.href : '#';
lnk.rel = a ? a.rel : '';
lnk.iv_i = a ? a.iv_i : 0;
}
function show() {
var u = this.href;
var opt = this.rel.split(':');
var idx = this.iv_i;
var view = byId('iv_view');
var full = byId('ivfull');
fixnav(byId('ivprev'), opt[2], idx, -1);
fixnav(byId('ivnext'), opt[2], idx, 1);
// calculate dimensions
var w = Math.floor(opt[1].split('x')[0]);
var h = Math.floor(opt[1].split('x')[1]);
var ww = typeof(window.innerWidth) == 'number' ? window.innerWidth : document.documentElement.clientWidth;
var wh = typeof(window.innerHeight) == 'number' ? window.innerHeight : document.documentElement.clientHeight;
var st = typeof(window.pageYOffset) == 'number' ? window.pageYOffset : document.body && document.body.scrollTop ? document.body.scrollTop : document.documentElement.scrollTop;
if(w+100 > ww || h+70 > wh) {
full.href = u;
setText(full, w+'x'+h);
full.style.visibility = 'visible';
if(w/h > ww/wh) { // width++
h *= (ww-100)/w;
w = ww-100;
} else { // height++
w *= (wh-70)/h;
h = wh-70;
}
} else
full.style.visibility = 'hidden';
var dw = w;
var dh = h+20;
dw = dw < 200 ? 200 : dw;
// update document
setClass(view, 'hidden', false);
setContent(byId('ivimg'), tag('img', {src:u, onclick:close,
onload: function() { setClass(byId('ivimgload'), 'hidden', true); },
style: 'width: '+w+'px; height: '+h+'px'
}));
view.style.width = dw+'px';
view.style.height = dh+'px';
view.style.left = ((ww - dw) / 2 - 10)+'px';
view.style.top = ((wh - dh) / 2 + st - 20)+'px';
byId('ivimgload').style.left = ((ww - 100) / 2 - 10)+'px';
byId('ivimgload').style.top = ((wh - 20) / 2 + st)+'px';
setClass(byId('ivimgload'), 'hidden', false);
return false;
}
function close() {
setClass(byId('iv_view'), 'hidden', true);
setClass(byId('ivimgload'), 'hidden', true);
setText(byId('ivimg'), '');
return false;
}
window.ivInit = init;
init();
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