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move parallax code to separate method #595

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This commit is contained in:
Hakim El Hattab 2013-09-15 14:55:23 -04:00
parent 347a907041
commit 8399e828db
2 changed files with 42 additions and 27 deletions
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65
js/reveal.js
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@ -1496,31 +1496,6 @@ var Reveal = (function(){
// Store references to the previous and current slides
currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
// Animate parallax background
if( dom.wrapper.getAttribute( 'data-parallax-background' ) || config.parallaxBackgroundImage ) {
var bs = dom.wrapper.style.backgroundSize.split( ' ' ),
bgWidth, bgHeight;
if( bs.length === 1 ) {
bgWidth = bgHeight = parseInt( bs[0], 10 );
}
else {
bgWidth = parseInt( bs[0], 10 );
bgHeight = parseInt( bs[1], 10 );
}
var slideWidth = dom.wrapper.offsetWidth;
var horizontalSlideCount = horizontalSlides.length;
var horizontalOffset = -( bgWidth - slideWidth ) / ( horizontalSlideCount-1 ) * h;
var slideHeight = dom.wrapper.offsetHeight;
var verticalSlideCount = currentVerticalSlides.length;
var verticalOffset = verticalSlideCount > 0 ? -( bgHeight - slideHeight ) / ( verticalSlideCount-1 ) * v : 0;
dom.wrapper.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
}
////////////////////////////////////
// Show fragment, if specified
if( typeof f !== 'undefined' ) {
@ -1583,6 +1558,7 @@ var Reveal = (function(){
updateControls();
updateProgress();
updateBackground();
updateParallax();
// Update the URL hash
writeURL();
@ -1905,6 +1881,45 @@ var Reveal = (function(){
}
/**
* Updates the position of the parallax background based
* on the current slide index.
*/
function updateParallax() {
// Animate parallax background
if( dom.wrapper.getAttribute( 'data-parallax-background' ) || config.parallaxBackgroundImage ) {
var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
var currentHorizontalSlide = horizontalSlides[ indexh ],
currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
var backgroundSize = dom.wrapper.style.backgroundSize.split( ' ' ),
backgroundWidth, backgroundHeight;
if( backgroundSize.length === 1 ) {
backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
}
else {
backgroundWidth = parseInt( backgroundSize[0], 10 );
backgroundHeight = parseInt( backgroundSize[1], 10 );
}
var slideWidth = dom.wrapper.offsetWidth;
var horizontalSlideCount = horizontalSlides.length;
var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
var slideHeight = dom.wrapper.offsetHeight;
var verticalSlideCount = currentVerticalSlides.length;
var verticalOffset = verticalSlideCount > 0 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
dom.wrapper.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
}
}
/**
* Determine what available routes there are for navigation.
*

4
js/reveal.min.js vendored
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