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