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88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/*
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* Copyright 2013 Aurélien Gâteau <agateau@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef SHADOWEFFECT_H
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#define SHADOWEFFECT_H
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// Qt
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#include <QGraphicsEffect>
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/**
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* An effect which draws a shadow behind an item, using
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* Plasma::PaintUtils::shadowBlur()
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*
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* If the color is not specified, it will attempt to compute the best
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* appropriate color, based on the item "color" property (if it has any).
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*/
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class ShadowEffect : public QGraphicsEffect
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{
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Q_OBJECT
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Q_PROPERTY(qreal xOffset READ xOffset WRITE setXOffset NOTIFY xOffsetChanged)
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Q_PROPERTY(qreal yOffset READ yOffset WRITE setYOffset NOTIFY yOffsetChanged)
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Q_PROPERTY(qreal blurRadius READ blurRadius WRITE setBlurRadius NOTIFY blurRadiusChanged)
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Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged)
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public:
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explicit ShadowEffect(QObject *parent = 0);
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~ShadowEffect();
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QRectF boundingRectFor(const QRectF &rect) const; // reimp
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qreal xOffset() const;
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qreal yOffset() const;
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qreal blurRadius() const;
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QColor color() const;
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/**
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* Use this method if you set the color manually and now want ShadowEffect
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* to pick the color automatically, based on the color of the item on which
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* the effect is applied.
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*/
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Q_INVOKABLE void resetColor();
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public Q_SLOTS:
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void setXOffset(qreal dx);
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void setYOffset(qreal dy);
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void setBlurRadius(qreal blurRadius);
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void setColor(const QColor &color);
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Q_SIGNALS:
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void xOffsetChanged(qreal);
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void yOffsetChanged(qreal);
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void blurRadiusChanged(qreal blurRadius);
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void colorChanged(const QColor &color);
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protected:
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void draw(QPainter *painter); // reimp
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void sourceChanged(ChangeFlags flags); // reimp
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private:
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qreal m_xOffset;
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qreal m_yOffset;
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qreal m_blurRadius;
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QColor m_color;
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QImage m_shadow;
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QImage generateShadow(const QPixmap &px) const;
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QColor computeColorFromSource() const;
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};
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#endif /* SHADOWEFFECT_H */
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