/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#ifndef CXEAUTOFOCUSCONTROL_H

#define CXEAUTOFOCUSCONTROL_H

#include <QObject>

#include <QMetaType>

#include "cxeerror.h"

class QImage;

/**

 * CxeAutoFocusControl is responsible for handling Autofocus events from the camera adaptation.

 * It also routes the Autofocus successful and failed events to the clients interested in Žknowing the

 * status of Autofocus.

 */

class CxeAutoFocusControl : public QObject

    {

    Q_OBJECT

public:

    /*

     * Autofocus control states.

     */

    enum State

        {

        //! focusing

        InProgress = 0x01,

        //! Autofocus Failed

        Failed     = 0x02,

        //! Focused

        Ready      = 0x04,

        //! State after successfully canceling AF or during startup

        Unknown    = 0x08,

        //! Starting to cancel any pending AF requests

        Canceling  = 0x10     // Starting to Cancel any pending AF requests

        };

    // TODO: Check if we have to get all the supported modes from adaptation.

    enum Mode

        {

        //! AF mode: Auto

        Auto,

        //! AF mode: Hyperfocal

        Hyperfocal,

        //! AF mode: Macro

        Macro,

        //! AF mode: Infinity

        Infinity,

        //! AF mode: Portrait

        Portrait

        };

    /**

     * Starts Autofocus.

     */

    virtual CxeError::Id start() = 0;

    /**

     * Cancels Autofocus.

     */

    virtual void cancel() = 0;                // cancels active start operation

    /**

     * Setting Autofocus Mode.

     */

    virtual void setMode( Mode newMode ) = 0; // sets default value for current view/mode

    /**

     * Get current Autofocus mode.

     */

    virtual Mode mode() const = 0;

    /**

     * Get current Autofocus state.

     */

    virtual State state() const = 0;                // returns current AF state, one of AutoFocusState

    /**

     * Check if Autofocus is Supported or Not.

     */

    virtual bool supported() const = 0;             // true when AF is supported

signals:

    void stateChanged( CxeAutoFocusControl::State newState, CxeError::Id error );

protected:

    CxeAutoFocusControl() {} // protected empty contructor so that derived class construction works

private:

    Q_DISABLE_COPY( CxeAutoFocusControl )

    };

Q_DECLARE_METATYPE(CxeAutoFocusControl::State)

#endif // CXEAUTOFOCUSCONTROL_H