xobs/lca2020-pay-it-forward
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slides three or more steps away from current are now hidden

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This commit is contained in:
Hakim El Hattab 2011-12-22 22:41:19 -08:00
parent 01000e1478
commit f6dc531298
1 changed files with 17 additions and 10 deletions
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27
js/reveal.js
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@ -282,16 +282,23 @@ var Reveal = (function(){
index = Math.max(Math.min(index, slides.length - 1), 0);
slides[index].setAttribute('class', 'present');
// Any element previous to index is given the 'past' class
slides.slice(0, index).map(function(element){
element.setAttribute('class', 'past');
});
// Any element subsequent to index is given the 'future' class
slides.slice(index + 1).map(function(element){
element.setAttribute('class', 'future');
});
for( var i = 0; i < slides.length; i++ ) {
var slide = slides[i];
// Optimization; hide all slides that are three or more steps
// away from the present slide
slide.style.display = Math.abs( index - i ) > 3 ? 'none' : 'block';
if( i < index ) {
// Any element previous to index is given the 'past' class
slide.setAttribute('class', 'past');
}
else if( i > index ) {
// Any element subsequent to index is given the 'future' class
slide.setAttribute('class', 'future');
}
}
}
else {
// Since there are no slides we can't be anywhere beyond the