itembackground.h

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/***************************************************************************
 *   Copyright 2009 by Alessandro Diaferia <alediaferia@gmail.com>         *
 *   Copyright 2009 by Marco Martin <notmart@gmail.com>                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Library General Public License as       *
 *   published by the Free Software Foundation; either version 2, 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 ITEMBACKGROUND_H
#define ITEMBACKGROUND_H

#include <QtGui/QGraphicsWidget>

#include <plasma/plasma_export.h>

namespace Plasma {

class FrameSvg;
class ItemBackgroundPrivate;

class PLASMA_EXPORT ItemBackground : public QGraphicsWidget
{
    Q_OBJECT
    Q_PROPERTY(QRectF target READ target WRITE setTarget)
    Q_PROPERTY(QGraphicsItem* targetItem READ targetItem WRITE setTargetItem)

    Q_PROPERTY(qreal animationUpdate READ animationUpdate WRITE setAnimationUpdate)

public:
    ItemBackground(QGraphicsWidget *parent = 0);
    ~ItemBackground();

    void setTarget(const QRectF &newGeometry);

    QRectF target() const;

    void setTargetItem(QGraphicsItem *target);

    QGraphicsItem *targetItem() const;

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

Q_SIGNALS:
    void appearanceChanged();

    void animationStep(qreal progress);

    void targetReached(QRectF);

    void targetItemReached(QGraphicsItem *);

protected:
    QVariant itemChange(GraphicsItemChange change, const QVariant &value);

    bool eventFilter(QObject *watched, QEvent *event);

    bool sceneEventFilter(QGraphicsItem *watched, QEvent *event);

    void resizeEvent(QGraphicsSceneResizeEvent *);

private:
    void setAnimationUpdate(qreal progress);
    qreal animationUpdate() const;

private:
    Q_PRIVATE_SLOT(d, void targetDestroyed(QObject*))
    Q_PRIVATE_SLOT(d, void frameSvgChanged())
    Q_PRIVATE_SLOT(d, void refreshCurrentTarget())

    friend class ItemBackgroundPrivate;
    ItemBackgroundPrivate * const d;
};
}

#endif