/sites/all/modules/ctools/js/dropbutton.js

/**
 * @file
 * Implement a simple, clickable dropbutton menu.
 *
 * See dropbutton.theme.inc for primary documentation.
 *
 * The javascript relies on four classes:
 * - The dropbutton must be fully contained in a div with the class
 *   ctools-dropbutton. It must also contain the class ctools-no-js
 *   which will be immediately removed by the javascript; this allows for
 *   graceful degradation.
 * - The trigger that opens the dropbutton must be an a tag wit hthe class
 *   ctools-dropbutton-link. The href should just be '#' as this will never
 *   be allowed to complete.
 * - The part of the dropbutton that will appear when the link is clicked must
 *   be a div with class ctools-dropbutton-container.
 * - Finally, ctools-dropbutton-hover will be placed on any link that is being
 *   hovered over, so that the browser can restyle the links.
 *
 * This tool isn't meant to replace click-tips or anything, it is specifically
 * meant to work well presenting menus.
 */

(function ($) {
  Drupal.behaviors.CToolsDropbutton = {
    attach: function() {
      // Process buttons. All dropbuttons are buttons.
      $('.ctools-button')
        .once('ctools-button')
        .removeClass('ctools-no-js');

      // Process dropbuttons. Not all buttons are dropbuttons.
      $('.ctools-dropbutton').once('ctools-dropbutton', function() {
        var $dropbutton = $(this);
        var $button = $('.ctools-content', $dropbutton);
        var $secondaryActions = $('li', $button).not(':first');
        var $twisty = $(".ctools-link", $dropbutton);
        var open = false;
        var hovering = false;
        var timerID = 0;

        var toggle = function(close) {
          // if it's open or we're told to close it, close it.
          if (open || close) {
            // If we're just toggling it, close it immediately.
            if (!close) {
              open = false;
              $secondaryActions.slideUp(100);
              $dropbutton.removeClass('open');
            }
            else {
              // If we were told to close it, wait half a second to make
              // sure that's what the user wanted.
              // Clear any previous timer we were using.
              if (timerID) {
                clearTimeout(timerID);
              }
              timerID = setTimeout(function() {
                if (!hovering) {
                  open = false;
                  $secondaryActions.slideUp(100);
                  $dropbutton.removeClass('open');
                }}, 500);
            }
          }
          else {
            // open it.
            open = true;
            $secondaryActions.animate({height: "show", opacity: "show"}, 100);
            $dropbutton.addClass('open');
          }
        }
        // Hide the secondary actions initially.
        $secondaryActions.hide();

        $twisty.click(function() {
            toggle();
            return false;
          });

        $dropbutton.hover(
          function() {
            hovering = true;
          }, // hover in
          function() { // hover out
            hovering = false;
            toggle(true);
            return false;
          }
        );
      });
    }
  }
})(jQuery);