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optimization, only declare background creation method once

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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103
js/reveal.js
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@ -425,71 +425,26 @@ 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 ) {
var data = {
background: slide.getAttribute( 'data-background' ),
backgroundSize: slide.getAttribute( 'data-background-size' ),
backgroundImage: slide.getAttribute( 'data-background-image' ),
backgroundColor: slide.getAttribute( 'data-background-color' ),
backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
backgroundPosition: slide.getAttribute( 'data-background-position' ),
backgroundTransition: slide.getAttribute( 'data-background-transition' )
};
var element = document.createElement( 'div' );
element.className = 'slide-background';
if( data.background ) {
// Auto-wrap image urls in url(...)
if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
element.style.backgroundImage = 'url('+ data.background +')';
}
else {
element.style.background = data.background;
}
}
if( data.background || data.backgroundColor || data.backgroundImage ) {
element.setAttribute( 'data-background-hash', data.background + data.backgroundSize + data.backgroundImage + data.backgroundColor + data.backgroundRepeat + data.backgroundPosition + data.backgroundTransition );
}
// Additional and optional background properties
if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
if( data.backgroundImage ) element.style.backgroundImage = 'url("' + data.backgroundImage + '")';
if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
container.appendChild( element );
return element;
}
// Iterate over all horizontal slides
toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
var backgroundStack;
if( isPrintingPDF() ) {
backgroundStack = _createBackground( slideh, slideh );
backgroundStack = createBackground( slideh, slideh );
}
else {
backgroundStack = _createBackground( slideh, dom.background );
backgroundStack = createBackground( slideh, dom.background );
}
// Iterate over all vertical slides
toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
if( isPrintingPDF() ) {
_createBackground( slidev, slidev );
createBackground( slidev, slidev );
}
else {
_createBackground( slidev, backgroundStack );
createBackground( slidev, backgroundStack );
}
} );
@ -520,6 +475,56 @@ var Reveal = (function(){
}
/**
* 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' ),
backgroundSize: slide.getAttribute( 'data-background-size' ),
backgroundImage: slide.getAttribute( 'data-background-image' ),
backgroundColor: slide.getAttribute( 'data-background-color' ),
backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
backgroundPosition: slide.getAttribute( 'data-background-position' ),
backgroundTransition: slide.getAttribute( 'data-background-transition' )
};
var element = document.createElement( 'div' );
element.className = 'slide-background';
if( data.background ) {
// Auto-wrap image urls in url(...)
if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
element.style.backgroundImage = 'url('+ data.background +')';
}
else {
element.style.background = data.background;
}
}
if( data.background || data.backgroundColor || data.backgroundImage ) {
element.setAttribute( 'data-background-hash', data.background + data.backgroundSize + data.backgroundImage + data.backgroundColor + data.backgroundRepeat + data.backgroundPosition + data.backgroundTransition );
}
// Additional and optional background properties
if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
if( data.backgroundImage ) element.style.backgroundImage = 'url("' + data.backgroundImage + '")';
if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
container.appendChild( element );
return element;
}
/**
* Applies the configuration settings from the config
* object. May be called multiple times.

6
js/reveal.min.js vendored
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