// $Id: collapse.js,v 1.17 2008/01/29 10:58:25 goba Exp $

/**

 * Toggle the visibility of a fieldset using smooth animations

 */

Drupal.toggleFieldset = function(fieldset) {

  if ($(fieldset).is('.collapsed')) {

    // Action div containers are processed separately because of a IE bug

    // that alters the default submit button behavior.

    var content = $('> div:not(.action)', fieldset);

    $(fieldset).removeClass('collapsed');

    content.hide();

    content.slideDown( {

      duration: 'fast',

      easing: 'linear',

      complete: function() {

        Drupal.collapseScrollIntoView(this.parentNode);

        this.parentNode.animating = false;

        $('div.action', fieldset).show();

      },

      step: function() {

        // Scroll the fieldset into view

        Drupal.collapseScrollIntoView(this.parentNode);

      }

    });

  }

  else {

    $('div.action', fieldset).hide();

    var content = $('> div:not(.action)', fieldset).slideUp('fast', function() {

      $(this.parentNode).addClass('collapsed');

      this.parentNode.animating = false;

    });

  }

};

/**

 * Scroll a given fieldset into view as much as possible.

 */

Drupal.collapseScrollIntoView = function (node) {

  var h = self.innerHeight || document.documentElement.clientHeight || $('body')[0].clientHeight || 0;

  var offset = self.pageYOffset || document.documentElement.scrollTop || $('body')[0].scrollTop || 0;

  var posY = $(node).offset().top;

  var fudge = 55;

  if (posY + node.offsetHeight + fudge > h + offset) {

    if (node.offsetHeight > h) {

      window.scrollTo(0, posY);

    } else {

      window.scrollTo(0, posY + node.offsetHeight - h + fudge);

    }

  }

};

Drupal.behaviors.collapse = function (context) {

  $('fieldset.collapsible > legend:not(.collapse-processed)', context).each(function() {

    var fieldset = $(this.parentNode);

    // Expand if there are errors inside

    if ($('input.error, textarea.error, select.error', fieldset).size() > 0) {

      fieldset.removeClass('collapsed');

    }

    // Turn the legend into a clickable link and wrap the contents of the fieldset

    // in a div for easier animation

    var text = this.innerHTML;

      $(this).empty().append($('<a href="#">'+ text +'</a>').click(function() {

        var fieldset = $(this).parents('fieldset:first')[0];

        // Don't animate multiple times

        if (!fieldset.animating) {

          fieldset.animating = true;

          Drupal.toggleFieldset(fieldset);

        }

        return false;

      }))

      .after($('<div class="fieldset-wrapper"></div>')

      .append(fieldset.children(':not(legend):not(.action)')))

      .addClass('collapse-processed');

  });

};