xobs/lca2020-pay-it-forward
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optimize use of getSlideBackground by avoiding index lookup

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This commit is contained in:
Hakim El Hattab 2017-11-23 15:45:15 +01:00
parent a0c013606e
commit a0a9aa7821
1 changed files with 5 additions and 6 deletions
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11
js/reveal.js
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@ -3200,8 +3200,7 @@
// Show the corresponding background element
var indices = getIndices( slide );
var background = getSlideBackground( indices.h, indices.v );
var background = getSlideBackground( slide );
if( background ) {
background.style.display = 'block';
@ -3288,8 +3287,7 @@
slide.style.display = 'none';
// Hide the corresponding background element
var indices = getIndices( slide );
var background = getSlideBackground( indices.h, indices.v );
var background = getSlideBackground( slide );
if( background ) {
background.style.display = 'none';
}
@ -3858,13 +3856,14 @@
* defined, have a background element so as long as the
* index is valid an element will be returned.
*
* @param {number} x Horizontal background index
* @param {mixed} x Horizontal background index OR a slide
* HTML element
* @param {number} y Vertical background index
* @return {(HTMLElement[]|*)}
*/
function getSlideBackground( x, y ) {
var slide = getSlide( x, y );
var slide = typeof x === 'number' ? getSlide( x, y ) : x;
if( slide ) {
return slide.slideBackgroundElement;
}