app/assets/stylesheets/explore.js
/**
* cbpGridGallery.js v1.0.0
* http://www.codrops.com
*
* Licensed under the MIT license.
* http://www.opensource.org/licenses/mit-license.php
*
* Copyright 2014, Codrops
* http://www.codrops.com
*/
;( function( window ) {
'use strict';
var docElem = window.document.documentElement,
transEndEventNames = {
'WebkitTransition': 'webkitTransitionEnd',
'MozTransition': 'transitionend',
'OTransition': 'oTransitionEnd',
'msTransition': 'MSTransitionEnd',
'transition': 'transitionend'
},
transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ],
support = {
transitions : Modernizr.csstransitions,
support3d : Modernizr.csstransforms3d
};
function setTransform( el, transformStr ) {
el.style.WebkitTransform = transformStr;
el.style.msTransform = transformStr;
el.style.transform = transformStr;
}
// from http://responsejs.com/labs/dimensions/
function getViewportW() {
var client = docElem['clientWidth'],
inner = window['innerWidth'];
if( client < inner )
return inner;
else
return client;
}
function extend( a, b ) {
for( var key in b ) {
if( b.hasOwnProperty( key ) ) {
a[key] = b[key];
}
}
return a;
}
function CBPGridGallery( el, options ) {
this.el = el;
this.options = extend( {}, this.options );
extend( this.options, options );
this._init();
}
CBPGridGallery.prototype.options = {
};
CBPGridGallery.prototype._init = function() {
// main grid
this.grid = this.el.querySelector( 'section.grid-wrap > ul.grid' );
// main grid items
this.gridItems = [].slice.call( this.grid.querySelectorAll( 'li:not(.grid-sizer)' ) );
// items total
this.itemsCount = this.gridItems.length;
// slideshow grid
this.slideshow = this.el.querySelector( 'section.slideshow > ul' );
// slideshow grid items
this.slideshowItems = [].slice.call( this.slideshow.children );
// index of current slideshow item
this.current = -1;
// slideshow control buttons
this.ctrlPrev = this.el.querySelector( 'section.slideshow > nav > span.nav-prev' );
this.ctrlNext = this.el.querySelector( 'section.slideshow > nav > span.nav-next' );
this.ctrlClose = this.el.querySelector( 'section.slideshow > nav > span.nav-close' );
// init masonry grid
this._initMasonry();
// init events
this._initEvents();
};
CBPGridGallery.prototype._initMasonry = function() {
var grid = this.grid;
imagesLoaded( grid, function() {
new Masonry( grid, {
itemSelector: 'li',
columnWidth: grid.querySelector( '.grid-sizer' )
});
});
};
CBPGridGallery.prototype._initEvents = function() {
var self = this;
// open the slideshow when clicking on the main grid items
this.gridItems.forEach( function( item, idx ) {
item.addEventListener( 'click', function() {
self._openSlideshow( idx );
} );
} );
// slideshow controls
this.ctrlPrev.addEventListener( 'click', function() { self._navigate( 'prev' ); } );
this.ctrlNext.addEventListener( 'click', function() { self._navigate( 'next' ); } );
this.ctrlClose.addEventListener( 'click', function() { self._closeSlideshow(); } );
// window resize
window.addEventListener( 'resize', function() { self._resizeHandler(); } );
// keyboard navigation events
document.addEventListener( 'keydown', function( ev ) {
if ( self.isSlideshowVisible ) {
var keyCode = ev.keyCode || ev.which;
switch (keyCode) {
case 37:
self._navigate( 'prev' );
break;
case 39:
self._navigate( 'next' );
break;
case 27:
self._closeSlideshow();
break;
}
}
} );
// trick to prevent scrolling when slideshow is visible
window.addEventListener( 'scroll', function() {
if ( self.isSlideshowVisible ) {
window.scrollTo( self.scrollPosition ? self.scrollPosition.x : 0, self.scrollPosition ? self.scrollPosition.y : 0 );
}
else {
self.scrollPosition = { x : window.pageXOffset || docElem.scrollLeft, y : window.pageYOffset || docElem.scrollTop };
}
});
};
CBPGridGallery.prototype._openSlideshow = function( pos ) {
this.isSlideshowVisible = true;
this.current = pos;
classie.addClass( this.el, 'slideshow-open' );
/* position slideshow items */
// set viewport items (current, next and previous)
this._setViewportItems();
// add class "current" and "show" to currentItem
classie.addClass( this.currentItem, 'current' );
classie.addClass( this.currentItem, 'show' );
// add class show to next and previous items
// position previous item on the left side and the next item on the right side
if( this.prevItem ) {
classie.addClass( this.prevItem, 'show' );
var translateVal = Number( -1 * ( getViewportW() / 2 + this.prevItem.offsetWidth / 2 ) );
setTransform( this.prevItem, support.support3d ? 'translate3d(' + translateVal + 'px, 0, -150px)' : 'translate(' + translateVal + 'px)' );
}
if( this.nextItem ) {
classie.addClass( this.nextItem, 'show' );
var translateVal = Number( getViewportW() / 2 + this.nextItem.offsetWidth / 2 );
setTransform( this.nextItem, support.support3d ? 'translate3d(' + translateVal + 'px, 0, -150px)' : 'translate(' + translateVal + 'px)' );
}
};
CBPGridGallery.prototype._navigate = function( dir ) {
if( this.isAnimating ) return;
if( dir === 'next' && this.current === this.itemsCount - 1 || dir === 'prev' && this.current === 0 ) {
this._closeSlideshow();
return;
}
this.isAnimating = true;
// reset viewport items
this._setViewportItems();
var self = this,
itemWidth = this.currentItem.offsetWidth,
// positions for the centered/current item, both the side items and the incoming ones
transformLeftStr = support.support3d ? 'translate3d(-' + Number( getViewportW() / 2 + itemWidth / 2 ) + 'px, 0, -150px)' : 'translate(-' + Number( getViewportW() / 2 + itemWidth / 2 ) + 'px)',
transformRightStr = support.support3d ? 'translate3d(' + Number( getViewportW() / 2 + itemWidth / 2 ) + 'px, 0, -150px)' : 'translate(' + Number( getViewportW() / 2 + itemWidth / 2 ) + 'px)',
transformCenterStr = '', transformOutStr, transformIncomingStr,
// incoming item
incomingItem;
if( dir === 'next' ) {
transformOutStr = support.support3d ? 'translate3d( -' + Number( (getViewportW() * 2) / 2 + itemWidth / 2 ) + 'px, 0, -150px )' : 'translate(-' + Number( (getViewportW() * 2) / 2 + itemWidth / 2 ) + 'px)';
transformIncomingStr = support.support3d ? 'translate3d( ' + Number( (getViewportW() * 2) / 2 + itemWidth / 2 ) + 'px, 0, -150px )' : 'translate(' + Number( (getViewportW() * 2) / 2 + itemWidth / 2 ) + 'px)';
}
else {
transformOutStr = support.support3d ? 'translate3d( ' + Number( (getViewportW() * 2) / 2 + itemWidth / 2 ) + 'px, 0, -150px )' : 'translate(' + Number( (getViewportW() * 2) / 2 + itemWidth / 2 ) + 'px)';
transformIncomingStr = support.support3d ? 'translate3d( -' + Number( (getViewportW() * 2) / 2 + itemWidth / 2 ) + 'px, 0, -150px )' : 'translate(-' + Number( (getViewportW() * 2) / 2 + itemWidth / 2 ) + 'px)';
}
// remove class animatable from the slideshow grid (if it has already)
classie.removeClass( self.slideshow, 'animatable' );
if( dir === 'next' && this.current < this.itemsCount - 2 || dir === 'prev' && this.current > 1 ) {
// we have an incoming item!
incomingItem = this.slideshowItems[ dir === 'next' ? this.current + 2 : this.current - 2 ];
setTransform( incomingItem, transformIncomingStr );
classie.addClass( incomingItem, 'show' );
}
var slide = function() {
// add class animatable to the slideshow grid
classie.addClass( self.slideshow, 'animatable' );
// overlays:
classie.removeClass( self.currentItem, 'current' );
var nextCurrent = dir === 'next' ? self.nextItem : self.prevItem;
classie.addClass( nextCurrent, 'current' );
setTransform( self.currentItem, dir === 'next' ? transformLeftStr : transformRightStr );
if( self.nextItem ) {
setTransform( self.nextItem, dir === 'next' ? transformCenterStr : transformOutStr );
}
if( self.prevItem ) {
setTransform( self.prevItem, dir === 'next' ? transformOutStr : transformCenterStr );
}
if( incomingItem ) {
setTransform( incomingItem, dir === 'next' ? transformRightStr : transformLeftStr );
}
var onEndTransitionFn = function( ev ) {
if( support.transitions ) {
if( ev.propertyName.indexOf( 'transform' ) === -1 ) return false;
this.removeEventListener( transEndEventName, onEndTransitionFn );
}
if( self.prevItem && dir === 'next' ) {
classie.removeClass( self.prevItem, 'show' );
}
else if( self.nextItem && dir === 'prev' ) {
classie.removeClass( self.nextItem, 'show' );
}
if( dir === 'next' ) {
self.prevItem = self.currentItem;
self.currentItem = self.nextItem;
if( incomingItem ) {
self.nextItem = incomingItem;
}
}
else {
self.nextItem = self.currentItem;
self.currentItem = self.prevItem;
if( incomingItem ) {
self.prevItem = incomingItem;
}
}
self.current = dir === 'next' ? self.current + 1 : self.current - 1;
self.isAnimating = false;
};
if( support.transitions ) {
self.currentItem.addEventListener( transEndEventName, onEndTransitionFn );
}
else {
onEndTransitionFn();
}
};
setTimeout( slide, 25 );
}
CBPGridGallery.prototype._closeSlideshow = function( pos ) {
// remove class slideshow-open from the grid gallery elem
classie.removeClass( this.el, 'slideshow-open' );
// remove class animatable from the slideshow grid
classie.removeClass( this.slideshow, 'animatable' );
var self = this,
onEndTransitionFn = function( ev ) {
if( support.transitions ) {
if( ev.target.tagName.toLowerCase() !== 'ul' ) return;
this.removeEventListener( transEndEventName, onEndTransitionFn );
}
// remove classes show and current from the slideshow items
classie.removeClass( self.currentItem, 'current' );
classie.removeClass( self.currentItem, 'show' );
if( self.prevItem ) {
classie.removeClass( self.prevItem, 'show' );
}
if( self.nextItem ) {
classie.removeClass( self.nextItem, 'show' );
}
// also reset any transforms for all the items
self.slideshowItems.forEach( function( item ) { setTransform( item, '' ); } );
self.isSlideshowVisible = false;
};
if( support.transitions ) {
this.el.addEventListener( transEndEventName, onEndTransitionFn );
}
else {
onEndTransitionFn();
}
};
CBPGridGallery.prototype._setViewportItems = function() {
this.currentItem = null;
this.prevItem = null;
this.nextItem = null;
if( this.current > 0 ) {
this.prevItem = this.slideshowItems[ this.current - 1 ];
}
if( this.current < this.itemsCount - 1 ) {
this.nextItem = this.slideshowItems[ this.current + 1 ];
}
this.currentItem = this.slideshowItems[ this.current ];
}
// taken from https://github.com/desandro/vanilla-masonry/blob/master/masonry.js by David DeSandro
// original debounce by John Hann
// http://unscriptable.com/index.php/2009/03/20/debouncing-javascript-methods/
CBPGridGallery.prototype._resizeHandler = function() {
var self = this;
function delayed() {
self._resize();
self._resizeTimeout = null;
}
if ( this._resizeTimeout ) {
clearTimeout( this._resizeTimeout );
}
this._resizeTimeout = setTimeout( delayed, 50 );
}
CBPGridGallery.prototype._resize = function() {
if ( this.isSlideshowVisible ) {
// update width value
if( this.prevItem ) {
var translateVal = Number( -1 * ( getViewportW() / 2 + this.prevItem.offsetWidth / 2 ) );
setTransform( this.prevItem, support.support3d ? 'translate3d(' + translateVal + 'px, 0, -150px)' : 'translate(' + translateVal + 'px)' );
}
if( this.nextItem ) {
var translateVal = Number( getViewportW() / 2 + this.nextItem.offsetWidth / 2 );
setTransform( this.nextItem, support.support3d ? 'translate3d(' + translateVal + 'px, 0, -150px)' : 'translate(' + translateVal + 'px)' );
}
}
}
// add to global namespace
window.CBPGridGallery = CBPGridGallery;
})( window );