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/* jshint onevar:false, loopfunc:true */
/* global jetpackSlideshowSettings, escape */
function JetpackSlideshow( element, transition, autostart ) {
this.element = element;
this.images = [];
this.controls = {};
this.transition = transition || 'fade';
this.autostart = autostart;
}
JetpackSlideshow.prototype.showLoadingImage = function( toggle ) {
if ( toggle ) {
this.loadingImage_ = document.createElement( 'div' );
this.loadingImage_.className = 'slideshow-loading';
var img = document.createElement( 'img' );
img.src = jetpackSlideshowSettings.spinner;
this.loadingImage_.appendChild( img );
this.loadingImage_.appendChild( this.makeZeroWidthSpan() );
this.element.append( this.loadingImage_ );
} else if ( this.loadingImage_ ) {
this.loadingImage_.parentNode.removeChild( this.loadingImage_ );
this.loadingImage_ = null;
}
};
JetpackSlideshow.prototype.init = function() {
this.showLoadingImage(true);
var self = this;
// Set up DOM.
for ( var i = 0; i < this.images.length; i++ ) {
var imageInfo = this.images[i];
var img = document.createElement( 'img' );
img.src = imageInfo.src;
img.title = typeof( imageInfo.title ) !== 'undefined' ? imageInfo.title : '';
img.alt = typeof( imageInfo.alt ) !== 'undefined' ? imageInfo.alt : '';
img.align = 'middle';
img.setAttribute('itemprop','image');
img.nopin = 'nopin';
var caption = document.createElement( 'div' );
caption.className = 'slideshow-slide-caption';
caption.setAttribute('itemprop','caption description');
caption.innerHTML = imageInfo.caption;
var container = document.createElement('div');
container.className = 'slideshow-slide';
container.setAttribute('itemprop','associatedMedia');
container.setAttribute('itemscope','');
container.setAttribute('itemtype','http://schema.org/ImageObject');
// Hide loading image once first image has loaded.
if ( i === 0 ) {
if ( img.complete ) {
// IE, image in cache
setTimeout( function() {
self.finishInit_();
}, 1);
} else {
jQuery( img ).load(function() {
self.finishInit_();
});
}
}
container.appendChild( img );
// I'm not sure where these were coming from, but IE adds
// bad values for width/height for portrait-mode images
img.removeAttribute('width');
img.removeAttribute('height');
container.appendChild( this.makeZeroWidthSpan() );
container.appendChild( caption );
this.element.append( container );
}
};
JetpackSlideshow.prototype.makeZeroWidthSpan = function() {
var emptySpan = document.createElement( 'span' );
emptySpan.className = 'slideshow-line-height-hack';
// Having a NBSP makes IE act weird during transitions, but other
// browsers ignore a text node with a space in it as whitespace.
if ( -1 !== window.navigator.userAgent.indexOf( 'MSIE ' ) ) {
emptySpan.appendChild( document.createTextNode(' ') );
} else {
emptySpan.innerHTML = ' ';
}
return emptySpan;
};
JetpackSlideshow.prototype.finishInit_ = function() {
this.showLoadingImage( false );
this.renderControls_();
var self = this;
if ( this.images.length > 1 ) {
// Initialize Cycle instance.
this.element.cycle( {
fx: this.transition,
prev: this.controls.prev,
next: this.controls.next,
slideExpr: '.slideshow-slide',
onPrevNextEvent: function() {
return self.onCyclePrevNextClick_.apply( self, arguments );
}
} );
var slideshow = this.element;
if ( ! this.autostart ) {
slideshow.cycle( 'pause' );
jQuery(this.controls.stop).removeClass( 'running' );
jQuery(this.controls.stop).addClass( 'paused' );
}
jQuery( this.controls.stop ).click( function() {
var button = jQuery(this);
if ( ! button.hasClass( 'paused' ) ) {
slideshow.cycle( 'pause' );
button.removeClass( 'running' );
button.addClass( 'paused' );
} else {
button.addClass( 'running' );
button.removeClass( 'paused' );
slideshow.cycle( 'resume', true );
}
return false;
} );
} else {
this.element.children( ':first' ).show();
this.element.css( 'position', 'relative' );
}
this.initialized_ = true;
};
JetpackSlideshow.prototype.renderControls_ = function() {
if ( this.controlsDiv_ ) {
return;
}
var controlsDiv = document.createElement( 'div' );
controlsDiv.className = 'slideshow-controls';
var controls = [ 'prev', 'stop', 'next' ];
for ( var i = 0; i < controls.length; i++ ) {
var controlName = controls[i];
var a = document.createElement( 'a' );
a.href = '#';
controlsDiv.appendChild( a );
this.controls[controlName] = a;
}
this.element.append( controlsDiv );
this.controlsDiv_ = controlsDiv;
};
JetpackSlideshow.prototype.onCyclePrevNextClick_ = function( isNext, i/*, slideElement*/ ) {
// If blog_id not present don't track page views
if ( ! jetpackSlideshowSettings.blog_id ) {
return;
}
var postid = this.images[i].id;
var stats = new Image();
stats.src = document.location.protocol +
'//pixel.wp.com/g.gif?host=' +
escape( document.location.host ) +
'&rand=' + Math.random() +
'&blog=' + jetpackSlideshowSettings.blog_id +
'&subd=' + jetpackSlideshowSettings.blog_subdomain +
'&user_id=' + jetpackSlideshowSettings.user_id +
'&post=' + postid +
'&ref=' + escape( document.location );
};
( function ( $ ) {
function jetpack_slideshow_init() {
$( '.jetpack-slideshow-noscript' ).remove();
$( '.jetpack-slideshow' ).each( function () {
var container = $( this );
if ( container.data( 'processed' ) ) {
return;
}
var slideshow = new JetpackSlideshow( container, container.data( 'trans' ), container.data( 'autostart' ) );
slideshow.images = container.data( 'gallery' );
slideshow.init();
container.data( 'processed', true );
} );
}
$( document ).ready( jetpack_slideshow_init );
$( 'body' ).on( 'post-load', jetpack_slideshow_init );
} )( jQuery );
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