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refactoring and optimization of overview mode

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This commit is contained in:
Hakim El Hattab
2015-01-26 20:38:21 +01:00
parent 44548ba357
commit 11293d7c94
3 changed files with 87 additions and 43 deletions
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99
js/reveal.js
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@@ -147,6 +147,9 @@
// Flags if reveal.js is loaded (has dispatched the 'ready' event)
loaded = false,
// Flags if the overview mode is currently active
overview = false,
// The horizontal and vertical index of the currently active slide
indexh,
indexv,
@@ -165,8 +168,9 @@
// The current scale of the presentation (see width/height config)
scale = 1,
// The current z position of the presentation container
z = 0,
// The transform that is currently applied to the slides container
slidesTransform = '',
layoutTransform = '',
// Cached references to DOM elements
dom = {},
@@ -1058,6 +1062,12 @@
}
function transformSlides() {
transformElement( dom.slides, layoutTransform ? layoutTransform + ' ' + slidesTransform : slidesTransform );
}
/**
* Injects the given CSS styles into the DOM.
*/
@@ -1446,7 +1456,6 @@
var size = getComputedSlideSize();
var slidePadding = 20; // TODO Dig this out of DOM
var zTransform = z !== 0 ? 'translateZ(-'+ z +'px)' : '';
// Layout the contents of the slides
layoutSlideContents( config.width, config.height, slidePadding );
@@ -1468,13 +1477,12 @@
dom.slides.style.top = '';
dom.slides.style.bottom = '';
dom.slides.style.right = '';
transformElement( dom.slides, zTransform );
layoutTransform = '';
}
else {
// Prefer zooming in desktop Chrome so that content remains crisp
if( !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
dom.slides.style.zoom = scale;
transformElement( dom.slides, zTransform );
}
// Apply scale transform as a fallback
else {
@@ -1482,10 +1490,12 @@
dom.slides.style.top = '50%';
dom.slides.style.bottom = 'auto';
dom.slides.style.right = 'auto';
transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +') ' + zTransform );
layoutTransform = 'translate(-50%, -50%) scale('+ scale +')';
}
}
transformSlides();
// Select all slides, vertical and horizontal
var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
@@ -1633,20 +1643,23 @@
function activateOverview() {
// Only proceed if enabled in config
if( config.overview ) {
if( config.overview && !isOverview() ) {
overview = true;
dom.wrapper.classList.add( 'overview' );
dom.wrapper.classList.remove( 'overview-deactivating' );
setTimeout( function() {
dom.wrapper.classList.add( 'overview-animated' );
}, 1 );
// Don't auto-slide while in overview mode
cancelAutoSlide();
var wasActive = dom.wrapper.classList.contains( 'overview' );
// Set the depth of the presentation. This determinse how far we
// zoom out and varies based on display size. It gets applied at
// the layout step.
z = window.innerWidth < 400 ? 1000 : 2500;
dom.wrapper.classList.add( 'overview' );
dom.wrapper.classList.remove( 'overview-deactivating' );
var margin = 70;
var slideWidth = config.width + margin,
slideHeight = config.height + margin;
// Move the backgrounds element into the slide container to
// that the same scaling is applied
@@ -1658,9 +1671,9 @@
for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
var hslide = horizontalSlides[i],
hbackground = horizontalBackgrounds[i],
hoffset = config.rtl ? -105 : 105;
hoffset = config.rtl ? -slideWidth : slideWidth;
var htransform = 'translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)';
var htransform = 'translateX(' + ( i * hoffset ) + 'px)';
hslide.setAttribute( 'data-index-h', i );
@@ -1679,7 +1692,7 @@
var vslide = verticalSlides[j],
vbackground = verticalBackgrounds[j];
var vtransform = 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)';
var vtransform = 'translateY(' + ( j * slideHeight ) + 'px)';
vslide.setAttribute( 'data-index-h', i );
vslide.setAttribute( 'data-index-v', j );
@@ -1702,22 +1715,38 @@
}
updateSlidesVisibility();
updateOverview();
layout();
if( !wasActive ) {
// Notify observers of the overview showing
dispatchEvent( 'overviewshown', {
'indexh': indexh,
'indexv': indexv,
'currentSlide': currentSlide
} );
}
// Notify observers of the overview showing
dispatchEvent( 'overviewshown', {
'indexh': indexh,
'indexv': indexv,
'currentSlide': currentSlide
} );
}
}
function updateOverview() {
var z = window.innerWidth < 400 ? 1000 : 2500;
var margin = 70;
var slideWidth = config.width + margin,
slideHeight = config.height + margin;
slidesTransform = [
'translateX('+ ( -indexh * slideWidth ) +'px)',
'translateY('+ ( -indexv * slideHeight ) +'px)',
'translateZ('+ ( -z ) +'px)'
].join( ' ' );
transformSlides();
}
/**
* Exits the slide overview and enters the currently
* active slide.
@@ -1727,11 +1756,17 @@
// Only proceed if enabled in config
if( config.overview ) {
slidesTransform = '';
overview = false;
dom.wrapper.classList.remove( 'overview' );
// Move the background element back out
dom.wrapper.appendChild( dom.background );
dom.wrapper.classList.remove( 'overview-animated' );
// Temporarily add a class so that transitions can do different things
// depending on whether they are exiting/entering overview, or just
// moving from slide to slide
@@ -1755,6 +1790,8 @@
slide( indexh, indexv );
layout();
cueAutoSlide();
// Notify observers of the overview hiding
@@ -1793,7 +1830,7 @@
*/
function isOverview() {
return dom.wrapper.classList.contains( 'overview' );
return overview;
}
@@ -1995,7 +2032,7 @@
// If the overview is active, re-activate it to update positions
if( isOverview() ) {
activateOverview();
updateOverview();
}
// Find the current horizontal slide and any possible vertical slides
@@ -2289,11 +2326,11 @@
// The number of steps away from the present slide that will
// be visible
var viewDistance = isOverview() ? 10 : config.viewDistance;
var viewDistance = isOverview() ? 7 : config.viewDistance;
// Limit view distance on weaker devices
if( isMobileDevice ) {
viewDistance = isOverview() ? 6 : 2;
viewDistance = isOverview() ? 7 : 2;
}
// Limit view distance on weaker devices