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ENH: fragment-pos attribute for ordering fragments

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This commit is contained in:
James Bergstra 2013-02-21 11:23:07 -05:00
parent d1943fcd91
commit c00de0a24d
1 changed files with 30 additions and 1 deletions
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29
js/reveal.js
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@ -138,6 +138,30 @@ var Reveal = (function(){
handled: false,
threshold: 80
};
/**
* Return a sorted fragments list, ordered by an increasing "fragment-pos" attribute.
*
* Fragments will be revealed in the order that they are returned by
* this function, so you can use "fragment-pos" attributes to control
* the order of fragment appearance.
*
* To maintain a sensible default fragment order, fragments are presumed
* to be passed in document order. This function adds a "fragment-pos"
* attribute to each node if such an attribute is not already present,
* and sets that attribute to an integer value which is the position of
* the fragment within the fragments list.
*
*/
function sort_fragments( fragments ) {
var a = toArray(fragments)
a.forEach( function (el, idx) {
if (!el.hasAttribute('fragment-pos')) {
el.setAttribute('fragment-pos', idx) }})
a.sort(function(l, r) {
return l.getAttribute( 'fragment-pos' )
- r.getAttribute( 'fragment-pos') })
return a
}
/**
* Starts up the presentation if the client is capable.
@ -997,6 +1021,7 @@ var Reveal = (function(){
// Show fragment, if specified
if( typeof f !== 'undefined' ) {
var fragments = currentSlide.querySelectorAll( '.fragment' );
fragments = sort_fragments(fragments)
toArray( fragments ).forEach( function( fragment, indexf ) {
if( indexf < f ) {
@ -1368,6 +1393,7 @@ var Reveal = (function(){
// Vertical slides:
if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
verticalFragments = sort_fragments(verticalFragments)
if( verticalFragments.length ) {
verticalFragments[0].classList.add( 'visible' );
@ -1379,6 +1405,7 @@ var Reveal = (function(){
// Horizontal slides:
else {
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
horizontalFragments = sort_fragments(horizontalFragments)
if( horizontalFragments.length ) {
horizontalFragments[0].classList.add( 'visible' );
@ -1403,6 +1430,7 @@ var Reveal = (function(){
// Vertical slides:
if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment.visible' );
verticalFragments = sort_fragments(verticalFragments)
if( verticalFragments.length ) {
verticalFragments[ verticalFragments.length - 1 ].classList.remove( 'visible' );
@ -1414,6 +1442,7 @@ var Reveal = (function(){
// Horizontal slides:
else {
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment.visible' );
horizontalFragments = sort_fragments(horizontalFragments)
if( horizontalFragments.length ) {
horizontalFragments[ horizontalFragments.length - 1 ].classList.remove( 'visible' );