/*************************************************************************

 * Copyright (C) 2014 by Hugo Pereira Da Costa <hugo.pereira@free.fr>    *

 *                                                                       *

 * This program is free software; you can redistribute it and/or modify  *

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

 * the Free Software Foundation; either version 2 of the License, or     *

 * (at your option) any later version.                                   *

 *                                                                       *

 * This program 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, write to the                         *

 * Free Software Foundation, Inc.,                                       *

 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *

 *************************************************************************/

#ifndef ADWAITA_ANIMATION_DATA_H

#define ADWAITA_ANIMATION_DATA_H

#include "adwaitaanimation.h"

#include "adwaitaqt_export.h"

#include <QEvent>

#include <QObject>

#include <QWidget>

#include <cmath>

namespace Adwaita

{

//* base class

class ADWAITAQT_EXPORT AnimationData : public QObject

{

    Q_OBJECT

public:

    //* constructor

    AnimationData(QObject *parent, QWidget *target)

        : QObject(parent)

        , _target(target)

        , _enabled(true)

    {

        Q_ASSERT(_target);

    }

    //* destructor

    virtual ~AnimationData()

    {

    }

    //* duration

    virtual void setDuration(int) = 0;

    //* steps

    static void setSteps(int value)

    {

        _steps = value;

    }

    //* enability

    virtual bool enabled() const

    {

        return _enabled;

    }

    //* enability

    virtual void setEnabled(bool value)

    {

        _enabled = value;

    }

    //* target

    const WeakPointer<QWidget> &target() const

    {

        return _target;

    }

    //* invalid opacity

    static const qreal OpacityInvalid;

protected:

    //* setup animation

    virtual void setupAnimation(const Animation::Pointer &animation, const QByteArray &property);

    //* apply step

    virtual qreal digitize(const qreal &value) const

    {

        if (_steps > 0) {

            return std::floor(value * _steps) / _steps;

        } else {

            return value;

        }

    }

    //* trigger target update

    virtual void setDirty() const

    {

        if (_target) {

            _target.data()->update();

        }

    }

private:

    //* guarded target

    WeakPointer<QWidget> _target;

    //* enability

    bool _enabled;

    //* steps

    static int _steps;

};

} // namespace Adwaita

#endif // ADWAITA_ANIMATION_DATA_H