// Easing equation, borrowed from jQuery easing plugin
// http://gsgd.co.uk/sandbox/jquery/easing/
jQuery.easing.easeOutQuart = function (x, t, b, c, d) {
 return -c * ((t=t/d-1)*t*t*t - 1) + b;
};

jQuery(function( $ ){
 /**
  * Most jQuery.serialScroll's settings, actually belong to jQuery.ScrollTo, check it's demo for an example of each option.
  * @see http://flesler.demos.com/jquery/scrollTo/
  * You can use EVERY single setting of jQuery.ScrollTo, in the settings hash you send to jQuery.serialScroll.
  */
 
 /**
  * The plugin binds 6 events to the container to allow external manipulation.
  * prev, next, goto, start, stop and notify
  * You use them like this: $(your_container).trigger('next'), $(your_container).trigger('goto', [5]) (0-based index).
  * If for some odd reason, the element already has any of these events bound, trigger it with the namespace.
  */  
 
 /**
  * IMPORTANT: this call to the plugin specifies ALL the settings (plus some of jQuery.ScrollTo)
  * This is done so you can see them. You DON'T need to specify the commented ones.
  * A 'target' is specified, that means that #screen is the context for target, prev, next and navigation.
  */
 $('#screen').serialScroll({
  target:'#sections',
  items:'li', // Selector to the items ( relative to the matched elements, '#sections' in this case )
  prev:'img.prev',// Selector to the 'prev' button (absolute!, meaning it's relative to the document)
  next:'img.next',// Selector to the 'next' button (absolute too)
  axis:'xy',// The default is 'y' scroll on both ways
  navigation:'#navigation li a',
  duration:700,// Length of the animation (if you scroll 2 axes and use queue, then each axis take half this time)
  force:true, // Force a scroll to the element specified by 'start' (some browsers don't reset on refreshes)

  //queue:false,// We scroll on both axes, scroll both at the same time.
  //event:'click',// On which event to react (click is the default, you probably won't need to specify it)
  //stop:false,// Each click will stop any previous animations of the target. (false by default)
  //lock:true, // Ignore events if already animating (true by default)  
  //start: 0, // On which element (index) to begin ( 0 is the default, redundant in this case )  
  //cycle:true,// Cycle endlessly ( constant velocity, true is the default )
  //step:1, // How many items to scroll each time ( 1 is the default, no need to specify )
  //jump:false, // If true, items become clickable (or w/e 'event' is, and when activated, the pane scrolls to them)
  //lazy:false,// (default) if true, the plugin looks for the items on each event(allows AJAX or JS content, or reordering)
  //interval:1000, // It's the number of milliseconds to automatically go to the next
  //constant:true, // constant speed
  
  onBefore:function( e, elem, $pane, $items, pos ){
   /**
    * 'this' is the triggered element 
    * e is the event object
    * elem is the element we'll be scrolling to
    * $pane is the element being scrolled
    * $items is the items collection at this moment
    * pos is the position of elem in the collection
    * if it returns false, the event will be ignored
    */
    //those arguments with a $ are jqueryfied, elem isn't.
   e.preventDefault();
   if( this.blur )
    this.blur();
  },
  onAfter:function( elem ){
   //'this' is the element being scrolled ($pane) not jqueryfied
  }
 });
 
 /**
  * No need to have only one element in view, you can use it for slideshows or similar.
  * In this case, clicking the images, scrolls to them.
  * No target in this case, so the selectors are absolute.
  */
 
 $('#slideshow').serialScroll({
  items:'li',
  prev:'#screen2 a.prev',
  next:'#screen2 a.next',
  offset:-230, //when scrolling to photo, stop 230 before reaching it (from the left)
  start:1, //as we are centering it, start at the 2nd
  duration:1200,
  force:true,
  stop:true,
  lock:false,
  cycle:false, //don't pull back once you reach the end
  easing:'easeOutQuart', //use this easing equation for a funny effect
  jump: false //click on the images to scroll to them
 });
 
 /**
  * The call below, is just to show that you are not restricted to prev/next buttons
  * In this case, the plugin will react to a custom event on the container
  * You can trigger the event from the outside.
  */
 
 var $news = $('#news-ticker');//we'll re use it a lot, so better save it to a var.
 $news.serialScroll({
  items:'div',
  duration:2000,
  force:true,
  axis:'y',
  easing:'linear',
  lazy:true,// NOTE: it's set to true, meaning you can add/remove/reorder items and the changes are taken into account.
  interval:1, // yeah! I now added auto-scrolling
  step:2 // scroll 2 news each time
 }); 
 
 /**
  * The following you don't need to see, is just for the "Add 2 Items" and "Shuffle"" buttons
  * These exemplify the use of the option 'lazy'.
  */
 $('#add-news').click(function(){
  var 
   $items = $news.find('div'),
   num = $items.length + 1;
   
  $items.slice(-2).clone().find('h4').each(function(i){
   $(this).text( 'News ' + (num + i) );
  }).end().appendTo($news);
 });
 $('#shuffle-news').click(function(){//don't shuffle the first, don't wanna deal with css
  var shuffled = $news.find('div').get().slice(1).sort(function(){
   return Math.round(Math.random())-0.5;//just a random number between -0.5 and 0.5
  });
  $(shuffled).appendTo($news);//add them all reordered
 });
});