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optimization, only declare background creation method once

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This commit is contained in:
Hakim El Hattab 2014-03-26 15:20:12 +01:00
parent 17d8f0b77c
commit ccbeaf4c32
2 changed files with 57 additions and 52 deletions
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111
js/reveal.js
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@ -425,9 +425,64 @@ var Reveal = (function(){
dom.background.innerHTML = '';
dom.background.classList.add( 'no-transition' );
// Helper method for creating a background element for the
// given slide
function _createBackground( slide, container ) {
// Iterate over all horizontal slides
toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
var backgroundStack;
if( isPrintingPDF() ) {
backgroundStack = createBackground( slideh, slideh );
}
else {
backgroundStack = createBackground( slideh, dom.background );
}
// Iterate over all vertical slides
toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
if( isPrintingPDF() ) {
createBackground( slidev, slidev );
}
else {
createBackground( slidev, backgroundStack );
}
} );
} );
// Add parallax background if specified
if( config.parallaxBackgroundImage ) {
dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
dom.background.style.backgroundSize = config.parallaxBackgroundSize;
// Make sure the below properties are set on the element - these properties are
// needed for proper transitions to be set on the element via CSS. To remove
// annoying background slide-in effect when the presentation starts, apply
// these properties after short time delay
setTimeout( function() {
dom.wrapper.classList.add( 'has-parallax-background' );
}, 1 );
}
else {
dom.background.style.backgroundImage = '';
dom.wrapper.classList.remove( 'has-parallax-background' );
}
}
/**
* Creates a background for the given slide.
*
* @param {HTMLElement} slide
* @param {HTMLElement} container The element that the background
* should be appended to
*/
function createBackground( slide, container ) {
var data = {
background: slide.getAttribute( 'data-background' ),
@ -470,56 +525,6 @@ var Reveal = (function(){
}
// Iterate over all horizontal slides
toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
var backgroundStack;
if( isPrintingPDF() ) {
backgroundStack = _createBackground( slideh, slideh );
}
else {
backgroundStack = _createBackground( slideh, dom.background );
}
// Iterate over all vertical slides
toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
if( isPrintingPDF() ) {
_createBackground( slidev, slidev );
}
else {
_createBackground( slidev, backgroundStack );
}
} );
} );
// Add parallax background if specified
if( config.parallaxBackgroundImage ) {
dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
dom.background.style.backgroundSize = config.parallaxBackgroundSize;
// Make sure the below properties are set on the element - these properties are
// needed for proper transitions to be set on the element via CSS. To remove
// annoying background slide-in effect when the presentation starts, apply
// these properties after short time delay
setTimeout( function() {
dom.wrapper.classList.add( 'has-parallax-background' );
}, 1 );
}
else {
dom.background.style.backgroundImage = '';
dom.wrapper.classList.remove( 'has-parallax-background' );
}
}
/**
* Applies the configuration settings from the config
* object. May be called multiple times.

6
js/reveal.min.js vendored
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