/cody/learning-zone/website-templates/eat-restaurant-bootstrap-html5-template/js/gallery.js
/** debouncedresize: special jQuery event that happens once after a window resize** latest version and complete README available on Github:* https://github.com/louisremi/jquery-smartresize/blob/master/jquery.debouncedresize.js** Copyright 2011 @louis_remi* Licensed under the MIT license.*/var $event = $.event,$special,resizeTimeout;
$special = $event.special.debouncedresize = { setup: function() { $( this ).on( "resize", $special.handler ); }, teardown: function() { $( this ).off( "resize", $special.handler ); }, handler: function( event, execAsap ) { // Save the context var context = this, args = arguments, dispatch = function() { // set correct event type event.type = "debouncedresize"; $event.dispatch.apply( context, args ); };
if ( resizeTimeout ) { clearTimeout( resizeTimeout ); }
execAsap ? dispatch() : resizeTimeout = setTimeout( dispatch, $special.threshold ); }, threshold: 250};
// ======================= imagesLoaded Plugin ===============================// https://github.com/desandro/imagesloaded
// $('#my-container').imagesLoaded(myFunction)// execute a callback when all images have loaded.// needed because .load() doesn't work on cached images
// callback function gets image collection as argument// this is the container
// original: MIT license. Paul Irish. 2010.// contributors: Oren Solomianik, David DeSandro, Yiannis Chatzikonstantinou
// blank image data-uri bypasses webkit log warning (thx doug jones)var BLANK = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==';
$.fn.imagesLoaded = function( callback ) { var $this = this, deferred = $.isFunction($.Deferred) ? $.Deferred() : 0, hasNotify = $.isFunction(deferred.notify), $images = $this.find('img').add( $this.filter('img') ), loaded = [], proper = [], broken = [];
// Register deferred callbacks if ($.isPlainObject(callback)) { $.each(callback, function (key, value) { if (key === 'callback') { callback = value; } else if (deferred) { deferred[key](value); } }); }
function doneLoading() { var $proper = $(proper), $broken = $(broken);
if ( deferred ) { if ( broken.length ) { deferred.reject( $images, $proper, $broken ); } else { deferred.resolve( $images ); } }
if ( $.isFunction( callback ) ) { callback.call( $this, $images, $proper, $broken ); } }
function imgLoaded( img, isBroken ) { // don't proceed if BLANK image, or image is already loaded if ( img.src === BLANK || $.inArray( img, loaded ) !== -1 ) { return; }
// store element in loaded images array loaded.push( img );
// keep track of broken and properly loaded images if ( isBroken ) { broken.push( img ); } else { proper.push( img ); }
// cache image and its state for future calls $.data( img, 'imagesLoaded', { isBroken: isBroken, src: img.src } );
// trigger deferred progress method if present if ( hasNotify ) { deferred.notifyWith( $(img), [ isBroken, $images, $(proper), $(broken) ] ); }
// call doneLoading and clean listeners if all images are loaded if ( $images.length === loaded.length ){ setTimeout( doneLoading ); $images.unbind( '.imagesLoaded' ); } }
// if no images, trigger immediately if ( !$images.length ) { doneLoading(); } else { $images.bind( 'load.imagesLoaded error.imagesLoaded', function( event ){ // trigger imgLoaded imgLoaded( event.target, event.type === 'error' ); }).each( function( i, el ) { var src = el.src;
// find out if this image has been already checked for status // if it was, and src has not changed, call imgLoaded on it var cached = $.data( el, 'imagesLoaded' ); if ( cached && cached.src === src ) { imgLoaded( el, cached.isBroken ); return; }
// if complete is true and browser supports natural sizes, try // to check for image status manually if ( el.complete && el.naturalWidth !== undefined ) { imgLoaded( el, el.naturalWidth === 0 || el.naturalHeight === 0 ); return; }
// cached images don't fire load sometimes, so we reset src, but only when // dealing with IE, or image is complete (loaded) and failed manual check // webkit hack from http://groups.google.com/group/jquery-dev/browse_thread/thread/eee6ab7b2da50e1f if ( el.readyState || el.complete ) { el.src = BLANK; el.src = src; } }); }
return deferred ? deferred.promise( $this ) : $this;};
var ExpandPreview = (function() {
// list of items var $grid = $( '#preview-grid' ), // the items $items = $grid.children( 'li' ), // current expanded item's index current = -1, // position (top) of the expanded item // used to know if the preview will expand in a different row previewPos = -1, // extra amount of pixels to scroll the window scrollExtra = 0, // extra margin when expanded (between preview overlay and the next items) marginExpanded = 10, $window = $( window ), winsize, $body = $( 'html, body' ), // transitionend events transEndEventNames = { 'WebkitTransition' : 'webkitTransitionEnd', 'MozTransition' : 'transitionend', 'OTransition' : 'oTransitionEnd', 'msTransition' : 'MSTransitionEnd', 'transition' : 'transitionend' }, transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ], // support for csstransitions support = Modernizr.csstransitions, // default settings settings = { minHeight : 500, speed : 350, easing : 'ease' };
function init( config ) { // the settings.. settings = $.extend( true, {}, settings, config );
// preload all images $grid.imagesLoaded( function() {
// save item´s size and offset saveItemInfo( true ); // get window´s size getWinSize(); // initialize some events initEvents();
} );
}
// add more items to the grid. // the new items need to appended to the grid. // after that call Grid.addItems(theItems); function addItems( $newitems ) {
$items = $items.add( $newitems );
$newitems.each( function() { var $item = $( this ); $item.data( { offsetTop : $item.offset().top, height : $item.height() } ); } );
initItemsEvents( $newitems );
}
// saves the item´s offset top and height (if saveheight is true) function saveItemInfo( saveheight ) { $items.each( function() { var $item = $( this ); $item.data( 'offsetTop', $item.offset().top ); if( saveheight ) { $item.data( 'height', $item.height() ); } } ); }
function initEvents() { // when clicking an item, show the preview with the item´s info and large image. // close the item if already expanded. // also close if clicking on the item´s cross initItemsEvents( $items ); // on window resize get the window´s size again // reset some values.. $window.on( 'debouncedresize', function() { scrollExtra = 0; previewPos = -1; // save item´s offset saveItemInfo(); getWinSize(); var preview = $.data( this, 'preview' ); if( typeof preview != 'undefined' ) { hidePreview(); }
} );
}
function initItemsEvents( $items ) { $items.on( 'click', 'span.preview-close', function() { hidePreview(); return false; } ).children( 'a' ).on( 'click', function(e) {
var $item = $( this ).parent(); // check if item already opened current === $item.index() ? hidePreview() : showPreview( $item ); return false;
} ); }
function getWinSize() { winsize = { width : $window.width(), height : $window.height() }; }
function showPreview( $item ) {
var preview = $.data( this, 'preview' ), // item´s offset top position = $item.data( 'offsetTop' );
scrollExtra = 0;
// if a preview exists and previewPos is different (different row) from item´s top then close it if( typeof preview != 'undefined' ) {
// not in the same row if( previewPos !== position ) { // if position > previewPos then we need to take te current preview´s height in consideration when scrolling the window if( position > previewPos ) { scrollExtra = preview.height; } hidePreview(); } // same row else { preview.update( $item ); return false; } }
// update previewPos previewPos = position; // initialize new preview for the clicked item preview = $.data( this, 'preview', new Preview( $item ) ); // expand preview overlay preview.open();
}
function hidePreview() { current = -1; var preview = $.data( this, 'preview' ); preview.close(); $.removeData( this, 'preview' ); }
// the preview obj / overlay function Preview( $item ) { this.$item = $item; this.expandedIdx = this.$item.index(); this.create(); this.update(); }
Preview.prototype = { create : function() { // create Preview structure: this.$title = $( '<h3></h3>' ); this.$description = $( '<p></p>' ); this.$href = $( '<a href="#">Visit website</a>' ); this.$details = $( '<div class="preview-details"></div>' ).append( this.$title, this.$description, this.$href ); this.$loading = $( '<div class="preview-loading"></div>' ); this.$fullimage = $( '<div class="preview-fullimg"></div>' ).append( this.$loading ); this.$closePreview = $( '<span class="preview-close"></span>' ); this.$previewInner = $( '<div class="preview-expander-inner"></div>' ).append( this.$closePreview, this.$fullimage, this.$details ); this.$previewEl = $( '<div class="preview-expander"></div>' ).append( this.$previewInner ); // append preview element to the item this.$item.append( this.getEl() ); // set the transitions for the preview and the item if( support ) { this.setTransition(); } }, update : function( $item ) {
if( $item ) { this.$item = $item; } // if already expanded remove class "og-expanded" from current item and add it to new item if( current !== -1 ) { var $currentItem = $items.eq( current ); $currentItem.removeClass( 'preview-expanded' ); this.$item.addClass( 'preview-expanded' ); // position the preview correctly this.positionPreview(); }
// update current value current = this.$item.index();
// update preview´s content var $itemEl = this.$item.children( 'a' ), eldata = { href : $itemEl.attr( 'href' ), largesrc : $itemEl.data( 'largesrc' ), title : $itemEl.data( 'title' ), description : $itemEl.data( 'description' ) };
this.$title.html( eldata.title ); this.$description.html( eldata.description ); this.$href.attr( 'href', eldata.href );
var self = this; // remove the current image in the preview if( typeof self.$largeImg != 'undefined' ) { self.$largeImg.remove(); }
// preload large image and add it to the preview // for smaller screens we don´t display the large image (the media query will hide the fullimage wrapper) if( self.$fullimage.is( ':visible' ) ) { this.$loading.show(); $( '<img/>' ).load( function() { var $img = $( this ); if( $img.attr( 'src' ) === self.$item.children('a').data( 'largesrc' ) ) { self.$loading.hide(); self.$fullimage.find( 'img' ).remove(); self.$largeImg = $img.fadeIn( 350 ); self.$fullimage.append( self.$largeImg ); } } ).attr( 'src', eldata.largesrc ); }
}, open : function() {
setTimeout( $.proxy( function() { // set the height for the preview and the item this.setHeights(); // scroll to position the preview in the right place this.positionPreview(); }, this ), 25 );
}, close : function() {
var self = this, onEndFn = function() { if( support ) { $( this ).off( transEndEventName ); } self.$item.removeClass( 'preview-expanded' ); self.$previewEl.remove(); };
setTimeout( $.proxy( function() {
if( typeof this.$largeImg !== 'undefined' ) { this.$largeImg.fadeOut( 'fast' ); } this.$previewEl.css( 'height', 0 ); // the current expanded item (might be different from this.$item) var $expandedItem = $items.eq( this.expandedIdx ); $expandedItem.css( 'height', $expandedItem.data( 'height' ) ).on( transEndEventName, onEndFn );
if( !support ) { onEndFn.call(); }
}, this ), 25 ); return false;
}, calcHeight : function() {
var heightPreview = winsize.height - this.$item.data( 'height' ) - marginExpanded, itemHeight = winsize.height;
if( heightPreview < settings.minHeight ) { heightPreview = settings.minHeight; itemHeight = settings.minHeight + this.$item.data( 'height' ) + marginExpanded; }
this.height = heightPreview; this.itemHeight = itemHeight;
}, setHeights : function() {
var self = this, onEndFn = function() { if( support ) { self.$item.off( transEndEventName ); } self.$item.addClass( 'preview-expanded' ); };
this.calcHeight(); this.$previewEl.css( 'height', this.height ); this.$item.css( 'height', this.itemHeight ).on( transEndEventName, onEndFn );
if( !support ) { onEndFn.call(); }
}, positionPreview : function() {
// scroll page // case 1 : preview height + item height fits in window´s height // case 2 : preview height + item height does not fit in window´s height and preview height is smaller than window´s height // case 3 : preview height + item height does not fit in window´s height and preview height is bigger than window´s height var position = this.$item.data( 'offsetTop' ), previewOffsetT = this.$previewEl.offset().top - scrollExtra, scrollVal = this.height + this.$item.data( 'height' ) + marginExpanded <= winsize.height ? position : this.height < winsize.height ? previewOffsetT - ( winsize.height - this.height ) : previewOffsetT; $body.animate( { scrollTop : scrollVal }, settings.speed );
}, setTransition : function() { this.$previewEl.css( 'transition', 'height ' + settings.speed + 'ms ' + settings.easing ); this.$item.css( 'transition', 'height ' + settings.speed + 'ms ' + settings.easing ); }, getEl : function() { return this.$previewEl; } }
return { init : init, addItems : addItems };
})();
$(function() { ExpandPreview.init(); });