/*
 *   Copyright (C) 2007 Petri Damsten <damu@iki.fi>
 *
 *   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 Library 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 SCROLLER_HEADER
#define SCROLLER_HEADER

#include "feeddata.h"
#include <QList>
#include <QGraphicsWidget>
#include <QWeakPointer>
#include <QAbstractAnimation>
#include <plasma/plasma_export.h>
#include <plasma/animator.h>
#include <plasma/dataengine.h>


class KIcon;
class SingleFeedItem;
class FeedData;
class QPropertyAnimation;

namespace Plasma
{
  // namespace Plasma
  class IconWidget;
  class Svg;
}

class Scroller : public QGraphicsWidget
{
    Q_OBJECT
    Q_PROPERTY(qreal animate READ animValue WRITE animate)

public:
    Scroller(QGraphicsItem *parent = 0);
    virtual ~Scroller();

    virtual void setGeometry(const QRectF &geometry);

    QList<FeedData> list();
    void delayedMoveNext(int delay);
    void listUpdated();

    void setAnimations(bool animations);
    bool animations() const;

    int  maxAge() const;
    void setMaxAge(int maxAge);

    bool dropTarget() const;
    void setDropTarget(bool droptarget);

    bool hovering() const;

    qreal animValue() const;

public slots:
    void dataUpdated(const QString& source, const Plasma::DataEngine::Data &data);

protected:
    virtual void wheelEvent (QGraphicsSceneWheelEvent *event);
    virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    virtual void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
    virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
    virtual QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;

protected slots:
    void leftClicked();
    void rightClicked();
    void moveNext();
    void movePrev();
    void animationComplete();
    void clearUnusedItems();
    void animate(qreal value);

private:
    void updateSize();
    void doAnimation(QAbstractAnimation::Direction direction);
    QString fuzzyDate(const QDateTime& datetime);

    int m_current;
    bool m_animations;

    //how many times has the user clicked / scrolled next or previous
    //while the current animation is being displayed.
    int m_delayedNext;
    int m_delayedPrev;

    int m_maxAge;

    bool m_droptarget;

    QList<FeedData> m_list;
    //itemlist contains all SingleFeedItems that are currently in
    //memory and should be cleared later.
    QList<SingleFeedItem *> m_itemlist;
    //activeitemlist contains all SingleFeedItems that are currently
    //displayed (always 1 or 2 in a horizontal scroller, but a future
    //vertical scroller might need more so we use a list
    QList<SingleFeedItem *> m_activeitemlist;
    QMap<QString, KIcon *> m_feedIcons;

    Plasma::IconWidget *m_left;
    Plasma::IconWidget *m_right;

    bool m_hovered;
    bool m_isAnimating;
    QWeakPointer<QPropertyAnimation> m_animation;
};

#endif
