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remember last visited vertical slide (closes #225)

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Hakim El Hattab
2012-11-10 14:48:29 -05:00
parent eac5a3a239
commit b4815a3a83
4 changed files with 39 additions and 21 deletions
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33
js/reveal.js
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@ -1,5 +1,5 @@
/*!
* reveal.js 2.2 r41
* reveal.js 2.2 r42
* http://lab.hakim.se/reveal-js
* MIT licensed
*
@ -500,6 +500,11 @@ var Reveal = (function(){
for( var i = 0, len = slides.length; i < len; i++ ) {
var slide = slides[ i ];
// Don't bother update invisible slides
if( slide.style.display === 'none' ) {
continue;
}
// Vertical stacks are not centered since their section
// children will be
if( slide.classList.contains( 'stack' ) ) {
@ -696,6 +701,21 @@ var Reveal = (function(){
// Remember where we were at before
previousSlide = currentSlide;
// Query all horizontal slides in the deck
var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
// If no vertical index is specified and the upcoming slide is a
// stack, resume at its previous vertical index
if( v === undefined && horizontalSlides[ h ] && horizontalSlides[ h ].classList.contains( 'stack' ) ) {
v = parseInt( horizontalSlides[ h ].getAttribute( 'data-previous-indexv' ) || 0 );
}
// If we were on a vertical stack, remember what vertical index
// it was on so we can resume at the same position when returning
if( previousSlide && previousSlide.parentNode.classList.contains( 'stack' ) ) {
previousSlide.parentNode.setAttribute( 'data-previous-indexv', indexv );
}
// Remember the state before this slide
var stateBefore = state.concat();
@ -743,9 +763,6 @@ var Reveal = (function(){
clearTimeout( writeURLTimeout );
writeURLTimeout = setTimeout( writeURL, 1500 );
// Query all horizontal slides in the deck
var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
// Find the current horizontal slide and any possible vertical slides
// within it
var currentHorizontalSlide = horizontalSlides[ indexh ],
@ -1135,14 +1152,14 @@ var Reveal = (function(){
function navigateLeft() {
// Prioritize hiding fragments
if( availableRoutes().left && isOverviewActive() || previousFragment() === false ) {
slide( indexh - 1, 0 );
slide( indexh - 1 );
}
}
function navigateRight() {
// Prioritize revealing fragments
if( availableRoutes().right && isOverviewActive() || nextFragment() === false ) {
slide( indexh + 1, 0 );
slide( indexh + 1 );
}
}
@ -1174,10 +1191,10 @@ var Reveal = (function(){
}
else {
// Fetch the previous horizontal slide, if there is one
var previousSlide = document.querySelector( '.reveal .slides>section.past:nth-child(' + indexh + ')' );
var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
if( previousSlide ) {
indexv = ( previousSlide.querySelectorAll( 'section' ).length + 1 ) || 0;
indexv = ( previousSlide.querySelectorAll( 'section' ).length + 1 ) || undefined;
indexh --;
slide();
}