CartoDB/cartodb20

  /**
   * User options dropdown (extends Dropdown)
   *
   * It shows the content in a dropdown (or dropup) with a special effect.
   *
   * Usage example:
   *
      var user_menu = new cdb.admin.DropdownMenu({
        target: $('a.account'),
        model: {username: username}, // No necessary indeed
        template_base: 'common/views/settings_item'
      });
   *
   */


  cdb.admin.DropdownMenu = cdb.ui.common.Dropdown.extend({

    show: function() {
      var dfd = $.Deferred();
      var self = this;
      //sometimes this dialog is child of a node that is removed
      //for that reason we link again DOM events just in case
      this.delegateEvents();
      this.$el
        .css({
          marginTop: self.options.vertical_position == "down" ? "-10px" : "10px",
          opacity:0,
          display:"block"
        })
        .animate({
          margin: "0",
          opacity: 1
        }, {
          "duration": this.options.speedIn,
          "complete": function(){
            dfd.resolve();
          }
        });
      this.trigger("onDropdownShown",this.el);

      return dfd.promise();
    },

    /**
     * open the dialog at x, y
     */
    openAt: function(x, y) {
      var dfd = $.Deferred();

      this.$el.css({
        top: y,
        left: x,
        width: this.options.width
      })
      .addClass(
        (this.options.vertical_position == "up" ? "vertical_top" : "vertical_bottom" )
        + " " +
        (this.options.horizontal_position == "right" ? "horizontal_right" : "horizontal_left" )
        + " " +
        // Add tick class
        "tick_" + this.options.tick
      )

      this.isOpen = true;

      // Show
      $.when(this.show()).done(function(){ dfd.resolve();})
      // xabel: I've add the deferred to make it easily testable

      return dfd.promise();
    },


    hide: function(done) {

      // don't attempt to hide the dropdown if it's already hidden
      if (!this.isOpen) { done && done(); return; }

      var self    = this;
      this.isOpen = false;

      this.$el.animate({

        marginTop: self.options.vertical_position == "down" ? "10px" : "-10px",
        opacity: 0

      }, this.options.speedOut, function(){

        // Remove selected class
        $(self.options.target).removeClass("selected");

        // And hide it
        self.$el.hide();
        done && done();

        self.trigger("onDropdownHidden", self.el);

      });
    }
  });