// $Id: slider.js,v 1.1.2.2 2009/02/25 11:52:11 marktheunissen Exp $

Drupal.behaviors.initSlider = function(context) {
  var panels = $('#slider .scrollContainer > div');
  var container = $('#slider .scrollContainer');

  // if false, we'll float all the panels left and fix the width
  // of the container
  var horizontal = true;

  // float the panels left if we're going horizontal
  if (horizontal) {
    panels.css({
      'float' : 'left',
      'position' : 'relative' // IE fix to ensure overflow is hidden
    });

    // calculate a new width for the container (so it holds all panels)
    container.css('width', panels[0].offsetWidth * panels.length);
  }

  // collect the scroll object, at the same time apply the hidden overflow
  // to remove the default scrollbars that will appear
  var scroll = $('#slider .scroll').css('overflow', 'hidden');

  // apply our left + right buttons
  scroll
    .before('<img class="scrollButtons left" src="' + path_to_slider + '/images/scroll_left.png" />')
    .after('<img class="scrollButtons right" src="' + path_to_slider + '/images/scroll_right.png" />');

  // handle nav selection
  function selectNav() {
    $(this)
      .parents('ul:first')
        .find('a')
          .removeClass('slidetab-active')
        .end()
      .end()
      .addClass('slidetab-active');
  }

  $('#slider .slidenav').find('a').click(selectNav);

  // go find the navigation link that has this target and select the nav
  function trigger(data) {
    var el = $('#slider .slidenav').find('a[href$="' + data.id + '"]').get(0);
    selectNav.call(el);
  }

  if (window.location.hash) {
    trigger({ id : window.location.hash.substr(1) });
  } else {
    $('ul.slidenav a:first').click();
  }

  // offset is used to move to *exactly* the right place, since I'm using
  // padding on my example, I need to subtract the amount of padding to
  // the offset.  Try removing this to get a good idea of the effect
  var offset = parseInt((horizontal ?
    container.css('paddingTop') :
    container.css('paddingLeft'))
    || 0) * -1;

  var scrollOptions = {
    target: scroll, // the element that has the overflow

    // can be a selector which will be relative to the target
    items: panels,

    navigation: '.slidenav a',

    // selectors are NOT relative to document, i.e. make sure they're unique
    prev: 'img.left',
    next: 'img.right',

    // allow the scroll effect to run both directions
    axis: 'xy',

    onAfter: trigger, // our final callback

    offset: offset,

    // duration of the sliding effect
    duration: 400,

    // easing - can be used with the easing plugin:
    // http://gsgd.co.uk/sandbox/jquery/easing/
    easing: 'swing'
  };

  // apply serialScroll to the slider - we chose this plugin because it
  // supports the indexed next and previous scroll along with hooking
  // in to our navigation.
  $('#slider').serialScroll(scrollOptions);

  // now apply localScroll to hook any other arbitrary links to trigger
  // the effect
  $.localScroll(scrollOptions);

  // finally, if the URL has a hash, move the slider in to position,
  // setting the duration to 1 because I don't want it to scroll in the
  // very first page load.  We don't always need this, but it ensures
  // the positioning is absolutely spot on when the pages loads.
  scrollOptions.duration = 1;
  $.localScroll.hash(scrollOptions);
};