1 /*  This file is part of the KDE project.

     2 

     3 Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 

     5 This library is free software: you can redistribute it and/or modify

     6 it under the terms of the GNU Lesser General Public License as published by

     7 the Free Software Foundation, either version 2.1 or 3 of the License.

     8 

     9 This library is distributed in the hope that it will be useful,

    10 but WITHOUT ANY WARRANTY; without even the implied warranty of

    11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12 GNU Lesser General Public License for more details.

    13 

    14 You should have received a copy of the GNU Lesser General Public License

    15 along with this library.  If not, see <http://www.gnu.org/licenses/>.

    16 */

    17 

    18 #ifndef PHONON_VOLUMEEFFECT_H

    19 #define PHONON_VOLUMEEFFECT_H

    20 

    21 #include "effect.h"

    22 #include <phonon/volumefaderinterface.h>

    23 

    24 QT_BEGIN_NAMESPACE

    25 

    26 #ifndef QT_NO_PHONON_VOLUMEFADEREFFECT

    27 

    28 namespace Phonon

    29 {

    30     namespace DS9

    31     {

    32         class VolumeEffectFilter;

    33         class VolumeEffect : public Effect, public Phonon::VolumeFaderInterface

    34         {

    35             Q_OBJECT

    36                 Q_INTERFACES(Phonon::VolumeFaderInterface)

    37         public:

    38             VolumeEffect(QObject *parent);

    39 

    40             //reimplementation

    41             virtual float volume() const;

    42             virtual void setVolume(float);

    43             virtual Phonon::VolumeFaderEffect::FadeCurve fadeCurve() const;

    44             virtual void setFadeCurve(Phonon::VolumeFaderEffect::FadeCurve);

    45             virtual void fadeTo(float, int);

    46 

    47         private:

    48             float m_volume;

    49 

    50             //paramaters used to fade

    51             Phonon::VolumeFaderEffect::FadeCurve m_fadeCurve;

    52 

    53             bool m_fading; //determines if we should be fading.

    54             float m_initialVolume;  

    55             float m_targetVolume;

    56             int m_fadeDuration;

    57             int m_fadeSamplePosition;

    58             qreal (*m_fadeCurveFn)(const qreal, const qreal, const qreal);

    59 

    60             //allow the filter to get access to that

    61             friend class VolumeEffectFilter;

    62 

    63         };

    64     }

    65 }

    66 

    67 #endif //QT_NO_PHONON_VOLUMEFADEREFFECT

    68 

    69 QT_END_NAMESPACE

    70 

    71 #endif