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490 lines
13 KiB
JavaScript
490 lines
13 KiB
JavaScript
/*
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* debouncedresize: special jQuery event that happens once after a window resize
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*
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* latest version and complete README available on Github:
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* https://github.com/louisremi/jquery-smartresize/blob/master/jquery.debouncedresize.js
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*
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* Copyright 2011 @louis_remi
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* Licensed under the MIT license.
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*/
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var $event = $.event,
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$special,
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resizeTimeout;
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$special = $event.special.debouncedresize = {
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setup: function() {
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$( this ).on( "resize", $special.handler );
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},
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teardown: function() {
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$( this ).off( "resize", $special.handler );
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},
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handler: function( event, execAsap ) {
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// Save the context
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var context = this,
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args = arguments,
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dispatch = function() {
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// set correct event type
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event.type = "debouncedresize";
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$event.dispatch.apply( context, args );
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};
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if ( resizeTimeout ) {
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clearTimeout( resizeTimeout );
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}
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execAsap ?
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dispatch() :
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resizeTimeout = setTimeout( dispatch, $special.threshold );
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},
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threshold: 250
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};
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// ======================= imagesLoaded Plugin ===============================
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// https://github.com/desandro/imagesloaded
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// $('#my-container').imagesLoaded(myFunction)
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// execute a callback when all images have loaded.
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// needed because .load() doesn't work on cached images
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// callback function gets image collection as argument
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// this is the container
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// original: MIT license. Paul Irish. 2010.
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// contributors: Oren Solomianik, David DeSandro, Yiannis Chatzikonstantinou
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// blank image data-uri bypasses webkit log warning (thx doug jones)
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var BLANK = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==';
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$.fn.imagesLoaded = function( callback ) {
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var $this = this,
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deferred = $.isFunction($.Deferred) ? $.Deferred() : 0,
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hasNotify = $.isFunction(deferred.notify),
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$images = $this.find('img').add( $this.filter('img') ),
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loaded = [],
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proper = [],
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broken = [];
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// Register deferred callbacks
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if ($.isPlainObject(callback)) {
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$.each(callback, function (key, value) {
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if (key === 'callback') {
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callback = value;
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} else if (deferred) {
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deferred[key](value);
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}
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});
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}
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function doneLoading() {
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var $proper = $(proper),
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$broken = $(broken);
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if ( deferred ) {
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if ( broken.length ) {
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deferred.reject( $images, $proper, $broken );
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} else {
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deferred.resolve( $images );
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}
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}
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if ( $.isFunction( callback ) ) {
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callback.call( $this, $images, $proper, $broken );
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}
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}
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function imgLoaded( img, isBroken ) {
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// don't proceed if BLANK image, or image is already loaded
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if ( img.src === BLANK || $.inArray( img, loaded ) !== -1 ) {
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return;
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}
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// store element in loaded images array
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loaded.push( img );
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// keep track of broken and properly loaded images
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if ( isBroken ) {
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broken.push( img );
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} else {
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proper.push( img );
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}
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// cache image and its state for future calls
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$.data( img, 'imagesLoaded', { isBroken: isBroken, src: img.src } );
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// trigger deferred progress method if present
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if ( hasNotify ) {
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deferred.notifyWith( $(img), [ isBroken, $images, $(proper), $(broken) ] );
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}
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// call doneLoading and clean listeners if all images are loaded
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if ( $images.length === loaded.length ){
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setTimeout( doneLoading );
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$images.unbind( '.imagesLoaded' );
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}
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}
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// if no images, trigger immediately
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if ( !$images.length ) {
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doneLoading();
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} else {
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$images.bind( 'load.imagesLoaded error.imagesLoaded', function( event ){
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// trigger imgLoaded
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imgLoaded( event.target, event.type === 'error' );
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}).each( function( i, el ) {
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var src = el.src;
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// find out if this image has been already checked for status
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// if it was, and src has not changed, call imgLoaded on it
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var cached = $.data( el, 'imagesLoaded' );
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if ( cached && cached.src === src ) {
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imgLoaded( el, cached.isBroken );
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return;
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}
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// if complete is true and browser supports natural sizes, try
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// to check for image status manually
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if ( el.complete && el.naturalWidth !== undefined ) {
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imgLoaded( el, el.naturalWidth === 0 || el.naturalHeight === 0 );
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return;
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}
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// cached images don't fire load sometimes, so we reset src, but only when
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// dealing with IE, or image is complete (loaded) and failed manual check
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// webkit hack from http://groups.google.com/group/jquery-dev/browse_thread/thread/eee6ab7b2da50e1f
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if ( el.readyState || el.complete ) {
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el.src = BLANK;
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el.src = src;
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}
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});
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}
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return deferred ? deferred.promise( $this ) : $this;
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};
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var Grid = (function() {
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// list of items
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var $grid = $( '#og-grid' ),
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// the items
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$items = $grid.children( 'li' ),
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// current expanded item's index
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current = -1,
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// position (top) of the expanded item
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// used to know if the preview will expand in a different row
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previewPos = -1,
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// extra amount of pixels to scroll the window
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scrollExtra = 0,
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// extra margin when expanded (between preview overlay and the next items)
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marginExpanded = 10,
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$window = $( window ), winsize,
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$body = $( 'html, body' ),
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// transitionend events
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transEndEventNames = {
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'WebkitTransition' : 'webkitTransitionEnd',
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'MozTransition' : 'transitionend',
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'OTransition' : 'oTransitionEnd',
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'msTransition' : 'MSTransitionEnd',
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'transition' : 'transitionend'
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},
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transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ],
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// support for csstransitions
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support = Modernizr.csstransitions,
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// default settings
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settings = {
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minHeight : 500,
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speed : 350,
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easing : 'ease'
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};
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function init( config ) {
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// the settings..
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settings = $.extend( true, {}, settings, config );
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// preload all images
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$grid.imagesLoaded( function() {
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// save item´s size and offset
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saveItemInfo( true );
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// get window´s size
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getWinSize();
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// initialize some events
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initEvents();
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} );
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}
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// saves the item´s offset top and height (if saveheight is true)
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function saveItemInfo( saveheight ) {
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$items.each( function() {
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var $item = $( this );
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$item.data( 'offsetTop', $item.offset().top );
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if( saveheight ) {
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$item.data( 'height', $item.height() );
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}
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} );
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}
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function initEvents() {
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// when clicking an item, show the preview with the item´s info and large image.
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// close the item if already expanded.
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// also close if clicking on the item´s cross
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$items.on( 'click', 'span.og-close', function() {
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hidePreview();
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return false;
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} ).children( 'a' ).on( 'click', function(e) {
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var $item = $( this ).parent();
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// check if item already opened
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current === $item.index() ? hidePreview() : showPreview( $item );
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return false;
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} );
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// on window resize get the window´s size again
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// reset some values..
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$window.on( 'debouncedresize', function() {
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scrollExtra = 0;
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previewPos = -1;
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// save item´s offset
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saveItemInfo();
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getWinSize();
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var preview = $.data( this, 'preview' );
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if( typeof preview != 'undefined' ) {
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hidePreview();
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}
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} );
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}
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function getWinSize() {
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winsize = { width : $window.width(), height : $window.height() };
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}
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function showPreview( $item ) {
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var preview = $.data( this, 'preview' ),
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// item´s offset top
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position = $item.data( 'offsetTop' );
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scrollExtra = 0;
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// if a preview exists and previewPos is different (different row) from item´s top then close it
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if( typeof preview != 'undefined' ) {
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// not in the same row
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if( previewPos !== position ) {
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// if position > previewPos then we need to take te current preview´s height in consideration when scrolling the window
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if( position > previewPos ) {
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scrollExtra = preview.height;
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}
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hidePreview();
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}
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// same row
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else {
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preview.update( $item );
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return false;
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}
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}
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// update previewPos
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previewPos = position;
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// initialize new preview for the clicked item
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preview = $.data( this, 'preview', new Preview( $item ) );
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// expand preview overlay
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preview.open();
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}
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function hidePreview() {
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current = -1;
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var preview = $.data( this, 'preview' );
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preview.close();
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$.removeData( this, 'preview' );
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}
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// the preview obj / overlay
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function Preview( $item ) {
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this.$item = $item;
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this.expandedIdx = this.$item.index();
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this.create();
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this.update();
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}
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Preview.prototype = {
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create : function() {
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// create Preview structure:
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this.$title = $( '<h4></h4>' );
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this.$description = $( '<p></p>' );
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this.$href = $( '<a href="#" class="btn btn-theme">External link</a>' );
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this.$details = $( '<div class="og-details"></div>' ).append( this.$title, this.$description, this.$href );
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this.$loading = $( '<div class="og-loading"></div>' );
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this.$fullimage = $( '<div class="og-fullimg"></div>' ).append( this.$loading );
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this.$closePreview = $( '<span class="og-close"></span>' );
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this.$previewInner = $( '<div class="og-expander-inner"></div>' ).append( this.$closePreview, this.$fullimage, this.$details );
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this.$previewEl = $( '<div class="og-expander"></div>' ).append( this.$previewInner );
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// append preview element to the item
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this.$item.append( this.getEl() );
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// set the transitions for the preview and the item
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if( support ) {
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this.setTransition();
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}
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},
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update : function( $item ) {
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if( $item ) {
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this.$item = $item;
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}
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// if already expanded remove class "og-expanded" from current item and add it to new item
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if( current !== -1 ) {
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var $currentItem = $items.eq( current );
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$currentItem.removeClass( 'og-expanded' );
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this.$item.addClass( 'og-expanded' );
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// position the preview correctly
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this.positionPreview();
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}
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// update current value
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current = this.$item.index();
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// update preview´s content
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var $itemEl = this.$item.children( 'a' ),
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eldata = {
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href : $itemEl.attr( 'href' ),
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largesrc : $itemEl.data( 'largesrc' ),
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title : $itemEl.data( 'title' ),
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description : $itemEl.data( 'description' )
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};
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this.$title.html( eldata.title );
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this.$description.html( eldata.description );
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this.$href.attr( 'href', eldata.href );
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var self = this;
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// remove the current image in the preview
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if( typeof self.$largeImg != 'undefined' ) {
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self.$largeImg.remove();
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}
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// preload large image and add it to the preview
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// for smaller screens we don´t display the large image (the media query will hide the fullimage wrapper)
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if( self.$fullimage.is( ':visible' ) ) {
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this.$loading.show();
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$( '<img/>' ).load( function() {
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var $img = $( this );
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if( $img.attr( 'src' ) === self.$item.children('a').data( 'largesrc' ) ) {
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self.$loading.hide();
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self.$fullimage.find( 'img' ).remove();
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self.$largeImg = $img.fadeIn( 350 );
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self.$fullimage.append( self.$largeImg );
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}
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} ).attr( 'src', eldata.largesrc );
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}
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},
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open : function() {
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setTimeout( $.proxy( function() {
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// set the height for the preview and the item
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this.setHeights();
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// scroll to position the preview in the right place
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this.positionPreview();
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}, this ), 25 );
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},
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close : function() {
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var self = this,
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onEndFn = function() {
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if( support ) {
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$( this ).off( transEndEventName );
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}
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self.$item.removeClass( 'og-expanded' );
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self.$previewEl.remove();
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};
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setTimeout( $.proxy( function() {
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if( typeof this.$largeImg !== 'undefined' ) {
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this.$largeImg.fadeOut( 'fast' );
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}
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this.$previewEl.css( 'height', 0 );
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// the current expanded item (might be different from this.$item)
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var $expandedItem = $items.eq( this.expandedIdx );
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$expandedItem.css( 'height', $expandedItem.data( 'height' ) ).on( transEndEventName, onEndFn );
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if( !support ) {
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onEndFn.call();
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}
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}, this ), 25 );
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return false;
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},
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calcHeight : function() {
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var heightPreview = winsize.height - this.$item.data( 'height' ) - marginExpanded,
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itemHeight = winsize.height;
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if( heightPreview < settings.minHeight ) {
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heightPreview = settings.minHeight;
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itemHeight = settings.minHeight + this.$item.data( 'height' ) + marginExpanded;
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}
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this.height = heightPreview;
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this.itemHeight = itemHeight;
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},
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setHeights : function() {
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var self = this,
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onEndFn = function() {
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if( support ) {
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self.$item.off( transEndEventName );
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}
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self.$item.addClass( 'og-expanded' );
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};
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this.calcHeight();
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this.$previewEl.css( 'height', this.height );
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this.$item.css( 'height', this.itemHeight ).on( transEndEventName, onEndFn );
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if( !support ) {
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onEndFn.call();
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}
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},
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positionPreview : function() {
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// scroll page
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// case 1 : preview height + item height fits in window´s height
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// case 2 : preview height + item height does not fit in window´s height and preview height is smaller than window´s height
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// case 3 : preview height + item height does not fit in window´s height and preview height is bigger than window´s height
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var position = this.$item.data( 'offsetTop' ),
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previewOffsetT = this.$previewEl.offset().top - scrollExtra,
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scrollVal = this.height + this.$item.data( 'height' ) + marginExpanded <= winsize.height ? position : this.height < winsize.height ? previewOffsetT - ( winsize.height - this.height ) : previewOffsetT;
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$body.animate( { scrollTop : scrollVal }, settings.speed );
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},
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setTransition : function() {
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this.$previewEl.css( 'transition', 'height ' + settings.speed + 'ms ' + settings.easing );
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this.$item.css( 'transition', 'height ' + settings.speed + 'ms ' + settings.easing );
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},
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getEl : function() {
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return this.$previewEl;
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}
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}
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return { init : init };
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})();
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