/* -*- 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"
#include "nsIAccessible.idl"
#include "nsIArray.idl"

/**
 * An interface for the accessibility module and in-process accessibility clients
 * for dealing with getting and changing the selection of accessible nodes.
 */
[scriptable, uuid(34d268d6-1dd2-11b2-9d63-83a5e0ada290)]
interface nsIAccessibleSelectable : nsISupports
{
    const unsigned long eSelection_Add = 0;
    const unsigned long eSelection_Remove = 1;
    const unsigned long eSelection_GetState = 2;

    /**
     * Return an nsIArray of selected nsIAccessible children 
     */
    nsIArray GetSelectedChildren();
    
    /**
     * Returns the number of accessible children currently selected.
     */
    readonly attribute long selectionCount;

    /**
     * Adds the specified accessible child of the object to the
     * object's selection.
     * If the specified object is already selected, then it does nothing.
     * @throws NS_ERROR_FAILURE if the specified object is not selectable.
     */
    void addChildToSelection(in long index);

    /**
     * Removes the specified child of the object from the object's selection.
     * If the specified object was not selected, then it does nothing.
     * @throws NS_ERROR_FAILURE if the specified object is not selectable.
     */
    void removeChildFromSelection(in long index);

    /**
     * Clears the selection in the object so that no children in the object
     * are selected.
     */
    void clearSelection();

    /**
     * Returns a reference to the accessible object representing the specified
     * selected child of the object.
     * @param index Zero-based selected accessible child index 
     * @return The nth selected accessible child
     */
    nsIAccessible refSelection(in long index);

    /**
      * Determines if the current child of this object is selected
      * @param The zero-based accessible child index
      * @return Returns true if the child is selected, false if not.
      */
    boolean isChildSelected(in long index);

    /**
     * Select all children
     * @return If the object does not accept multiple selection, return false.
     *         Otherwise, returns true.
     */
    boolean selectAllSelection();
};