/* ************************************************************************

   qooxdoo - the new era of web development

   http://qooxdoo.org

   Copyright:
     2004-2009 1&1 Internet AG, Germany, http://www.1und1.de

   License:
     LGPL: http://www.gnu.org/licenses/lgpl.html
     EPL: http://www.eclipse.org/org/documents/epl-v10.php
     See the LICENSE file in the project's top-level directory for details.

   Authors:
     * Christian Hagendorn (chris_schmidt)
     * Martin Wittemann (martinwittemann)

************************************************************************ */

/**
 * Each object, which should support multiselection selection have to
 * implement this interface.
 */
qx.Interface.define("qx.ui.core.IMultiSelection",
{
  extend: qx.ui.core.ISingleSelection,


  /*
  *****************************************************************************
     MEMBERS
  *****************************************************************************
  */


  members :
  {
    /**
     * Selects all items of the managed object.
     */
    selectAll : function() {
      return true;
    },

    /**
     * Adds the given item to the existing selection.
     *
     * @param item {qx.ui.core.Widget} Any valid item
     * @throws {Error} if the item is not a child element.
     */
    addToSelection : function(item) {
      return arguments.length == 1;
    },

    /**
     * Removes the given item from the selection.
     *
     * Use {@link qx.ui.core.ISingleSelection#resetSelection} when you
     * want to clear the whole selection at once.
     *
     * @param item {qx.ui.core.Widget} Any valid item
     * @throws {Error} if the item is not a child element.
     */
    removeFromSelection : function(item) {
      return arguments.length == 1;
    }
  }
});
