/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIAccessible;
interface nsIArray;

/**
 * An accessibility interface for selectable widgets.
 */
[scriptable, builtinclass, uuid(8efb03d4-1354-4875-94cf-261336057626)]
interface nsIAccessibleSelectable : nsISupports
{
  /**
   * Return an nsIArray of selected items within the widget.
   */
  readonly attribute nsIArray selectedItems;

  /**
   * Return the number of currently selected items.
   */
  readonly attribute unsigned long selectedItemCount;

  /**
   * Return a nth selected item within the widget.
   */
  nsIAccessible getSelectedItemAt(in unsigned long index);

  /**
   * Return true if the given item is selected.
   */
  boolean isItemSelected(in unsigned long index);

  /**
   * Adds the specified item to the widget's selection.
   */
  void addItemToSelection(in unsigned long index);

  /**
   * Removes the specified item from the widget's selection.
   */
  void removeItemFromSelection(in unsigned long index);

  /**
   * Select all items.
   *
   * @return false if the object does not accept multiple selection,
   *         otherwise true.
   */
  boolean selectAll();

  /**
   * Unselect all items.
   */
  void unselectAll();
};
