/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Kan-Ru Chen <kchen@mozilla.com> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIDOMMozWakeLockListener;

/**
 * This interface implements navigator.mozPower
 */
[scriptable, uuid(256a3287-f528-45b5-9ba8-2b3650c056e6)]
interface nsIDOMMozPowerManager : nsISupports
{
    void    powerOff();
    void    reboot();

    /**
     * The listeners are notified when a resource changes its lock state to:
     *  - unlocked
     *  - locked but not visible
     *  - locked and visible
     */
    void    addWakeLockListener(in nsIDOMMozWakeLockListener aListener);
    void    removeWakeLockListener(in nsIDOMMozWakeLockListener aListener);

    /**
     * Query the wake lock state of the topic.
     *
     * Possible states are:
     *
     *  - "unlocked" - nobody holds the wake lock.
     *
     *  - "locked-foreground" - at least one window holds the wake lock,
     *    and it is visible.
     *
     *  - "locked-background" - at least one window holds the wake lock,
     *    but all of them are hidden.
     *
     * @param aTopic The resource name related to the wake lock.
     */
    DOMString getWakeLockState(in DOMString aTopic);

    /**
     * Is the device's screen currently enabled?  This attribute controls the
     * device's screen, so setting it to false will turn off the screen.
     */
    attribute boolean screenEnabled;

    /**
     * How bright is the screen's backlight, on a scale from 0 (very dim) to 1
     * (full brightness)?  Setting this attribute modifies the screen's
     * brightness.
     *
     * You can read and write this attribute even when the screen is disabled,
     * but the backlight is off while the screen is disabled.
     *
     * If you write a value of X into this attribute, the attribute may not have
     * the same value X when you later read it.  Most screens don't support as
     * many different brightness levels as there are doubles between 0 and 1, so
     * we may reduce the value's precision before storing it.
     *
     * @throw NS_ERROR_INVALID_ARG if brightness is not in the range [0, 1].
     */
    attribute double screenBrightness;

    /**
     * Is it possible that the device's CPU will sleep after the screen is
     * disabled?  Setting this attribute to false will prevent the device
     * entering suspend state.
     */
    attribute boolean cpuSleepAllowed;
};
