/*
 * Copyright (C) 2015 ~ 2017 Deepin Technology Co., Ltd.
 *
 * 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 3 of the License, or
 * 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef GraphicsGlowEffect_H
#define GraphicsGlowEffect_H

#include <QGraphicsDropShadowEffect>
#include <QGraphicsEffect>
#include <QPainter>

#include "dtkwidget_global.h"

DWIDGET_BEGIN_NAMESPACE

class LIBDTKWIDGETSHARED_EXPORT GraphicsGlowEffect : public QGraphicsEffect
{
    Q_OBJECT
public:
    explicit GraphicsGlowEffect(QObject *parent = 0);

    void draw(QPainter *painter);
    QRectF boundingRectFor(const QRectF &rect) const;

    inline void setOffset(qreal dx, qreal dy) {m_xOffset = dx; m_yOffset = dy;}

    inline void setXOffset(qreal dx) {m_xOffset = dx;}
    inline qreal xOffset() const {return m_xOffset;}

    inline void setYOffset(qreal dy) {m_yOffset = dy;}
    inline qreal yOffset() const {return m_yOffset;}

    inline void setDistance(qreal distance) { m_distance = distance; updateBoundingRect(); }
    inline qreal distance() const { return m_distance; }

    inline void setBlurRadius(qreal blurRadius) { m_blurRadius = blurRadius; updateBoundingRect(); }
    inline qreal blurRadius() const { return m_blurRadius; }

    inline void setColor(const QColor &color) { m_color = color; }
    inline QColor color() const { return m_color; }

protected:
    void cachePixmap(const QPixmap &source);

private:
    QPixmap cacheBlurPixmap;
    qreal   m_xOffset;
    qreal   m_yOffset;
    qreal   m_distance;
    qreal   m_blurRadius;
    QColor  m_color;
};

DWIDGET_END_NAMESPACE

#endif // GraphicsGlowEffect_H
