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new api method: getBackgroundSlide

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This commit is contained in:
Hakim El Hattab 2014-04-27 14:46:49 +02:00
parent 1623b3782e
commit eea437f4be
2 changed files with 45 additions and 11 deletions
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48
js/reveal.js
View File

@ -2286,7 +2286,7 @@ var Reveal = (function(){
element.removeAttribute( 'data-src' ); element.removeAttribute( 'data-src' );
} ); } );
// Media elements with multiple <source>s // Media elements with <source> children
toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) { toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
var sources = 0; var sources = 0;
@ -2634,6 +2634,38 @@ var Reveal = (function(){
} }
function getSlide( x, y ) {
var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
if( typeof y === 'number' ) {
return verticalSlides ? verticalSlides[ y ] : undefined;
}
return horizontalSlide;
}
/**
* Returns the background element for the given slide.
* All slides, even the ones with no background properties
* defined, have a background element so this never returns
* null.
*/
function getSlideBackground( x, y ) {
var horizontalBackground = document.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
if( typeof y === 'number' ) {
return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
}
return horizontalBackground;
}
/** /**
* Retrieves the current state of the presentation as * Retrieves the current state of the presentation as
* an object. This state can then be restored at any * an object. This state can then be restored at any
@ -3720,17 +3752,11 @@ var Reveal = (function(){
getTotalSlides: getTotalSlides, getTotalSlides: getTotalSlides,
// Returns the slide at the specified index, y is optional // Returns the slide element at the specified index
getSlide: function( x, y ) { getSlide: getSlide,
var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
if( typeof y !== 'undefined' ) { // Returns the slide background element at the specified index
return verticalSlides ? verticalSlides[ y ] : undefined; getSlideBackground: getSlideBackground,
}
return horizontalSlide;
},
// Returns the previous slide element, may be null // Returns the previous slide element, may be null
getPreviousSlide: function() { getPreviousSlide: function() {

8
test/test.js
View File

@ -109,6 +109,14 @@ Reveal.addEventListener( 'ready', function() {
strictEqual( Reveal.getSlide( 100 ), undefined, 'returns undefined when slide can\'t be found' ); strictEqual( Reveal.getSlide( 100 ), undefined, 'returns undefined when slide can\'t be found' );
}); });
test( 'Reveal.getSlideBackground', function() {
var firstBackground = document.querySelector( '.reveal .backgrounds>.slide-background:first-child' );
equal( Reveal.getSlideBackground( 0 ), firstBackground, 'gets correct first background' );
strictEqual( Reveal.getSlideBackground( 100 ), undefined, 'returns undefined when background can\'t be found' );
});
test( 'Reveal.getPreviousSlide/getCurrentSlide', function() { test( 'Reveal.getPreviousSlide/getCurrentSlide', function() {
Reveal.slide( 0, 0 ); Reveal.slide( 0, 0 );
Reveal.slide( 1, 0 ); Reveal.slide( 1, 0 );