/*
 * barrier -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2002 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 * 
 * This package 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include "base/Event.h"
#include "common/IInterface.h"

//! Screen saver interface
/*!
This interface defines the methods common to all screen savers.
*/
class IScreenSaver : public IInterface {
public:
    // note -- the c'tor/d'tor must *not* enable/disable the screen saver

    //! @name manipulators
    //@{

    //! Enable screen saver
    /*!
    Enable the screen saver, restoring the screen saver settings to
    what they were when disable() was previously called.  If disable()
    wasn't previously called then it should keep the current settings
    or use reasonable defaults.
    */
    virtual void        enable() = 0;

    //! Disable screen saver
    /*!
    Disable the screen saver, saving the old settings for the next
    call to enable().
    */
    virtual void        disable() = 0;

    //! Activate screen saver
    /*!
    Activate (i.e. show) the screen saver.
    */
    virtual void        activate() = 0;

    //! Deactivate screen saver
    /*!
    Deactivate (i.e. hide) the screen saver, reseting the screen saver
    timer.
    */
    virtual void        deactivate() = 0;

    //@}
    //! @name accessors
    //@{

    //! Test if screen saver on
    /*!
    Returns true iff the screen saver is currently active (showing).
    */
    virtual bool        isActive() const = 0;

    //@}
};
