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/* This file is part of the KDE libraries
    Copyright (C) 2006 Aaron Seigo <aseigo@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef KDELIBS_KNOTIFICATIONRESTRICTIONS_H
#define KDELIBS_KNOTIFICATIONRESTRICTIONS_H

#include <kdeui_export.h>

#include <QtCore/QObject>

/**
 * KNotificationRestrictions provides a simple mechanism to avoid disruptions
 * during full screen presentations or other use cases where the screensaver or
 * desktop notifcations are inappropriate.
 *
 * Using KNotificationRestrictions is quite straightforward: create an instance
 * of KNotificationRestrictions, passing in the set of or'd flags representing
 * the services that should be prevented from interrupting the user. When done
 * (for instance when the presentation is complete) simply delete the
 * KNotificationRestrictions object.
 *
 * Example: to ensure the screensaver does not turn on during a presentation:
 * @code
 * void MyApp::doPresentation()
 * {
 *   KNotificationRestrictions restrict(KNotificationRestrictions::ScreenSaver);
 *   // show presentation
 * }
 * @endcode
 */
class KDEUI_EXPORT KNotificationRestrictions : public QObject
{
    Q_OBJECT

    public:
        /**
         * @enum Service
         */
        enum Service
        {
            /**
             * The baseline "don't disable anything" value.
             */
            NoServices = 0,
            /**
             * Causes the screensaver to be prevented from automatically
             * turning on.
             */
            ScreenSaver = 1,
            /**
             * Causes instant messaging and email notifications to not appear.
             *
             * @note <b>not implemented yet</b>
             */
            MessagingPopups = 2,
            /**
             * Causes non-critical desktop messages to be suppressed.
             *
             * @note <b>not implemented yet</b>
             */
            Notifications = 4,
            /**
             * Causes all desktop notifications, including critical ones
             * (such as as "battery low" warnings) to be suppressed.
             *
             * @note <b>not implemented yet</b>
             */
            CriticalNotifications = 8,
            NonCriticalServices = ScreenSaver |
                                  MessagingPopups |
                                  Notifications,
            AllServices = NonCriticalServices | CriticalNotifications
        };
        Q_DECLARE_FLAGS(Services, Service)

        /**
         * Constructs a new service for restrict some services.
         *
         * @param control the services to be restricted
         * @param parent the parent of this object
         */
        explicit KNotificationRestrictions(Services control = NonCriticalServices,
                                           QObject* parent = 0);
        virtual ~KNotificationRestrictions();

    private:
        class Private;
        Private * const d;

        Q_PRIVATE_SLOT( d, void screensaverFakeKeyEvent() )
};

Q_DECLARE_OPERATORS_FOR_FLAGS(KNotificationRestrictions::Services)
#endif