/*
    Copyright (C) 2010 Klarälvdalens Datakonsult AB,
        a KDAB Group company, info@kdab.net,
        author Stephen Kelly <stephen@kdab.com>

    This library 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 of the License, or (at your
    option) any later version.

    This library 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 Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#ifndef PROGRESSSPINNERDELEGATE_P_H
#define PROGRESSSPINNERDELEGATE_P_H

#include <QStyledItemDelegate>
#include <QSet>

#include <kpixmapsequence.h>

namespace Akonadi {

class DelegateAnimator : public QObject
{
  Q_OBJECT
public:
  DelegateAnimator(QAbstractItemView *view);

  void push(const QModelIndex &index) {
    if (m_animations.isEmpty())
      m_timerId = startTimer(200);
    m_animations.insert(Animation(index));
  }
  void pop(const QModelIndex &index) {
    m_animations.remove(Animation(index));
    if (m_animations.isEmpty() && m_timerId != -1) {
      killTimer(m_timerId);
      m_timerId = -1;
    }
  }

  QPixmap sequenceFrame(const QModelIndex &index);

  static const int sCount = 7;
  struct Animation {
      inline Animation(const QPersistentModelIndex &idx)
          : frame(0), index(idx)
      {
      }

      bool operator==(const Animation &other) const
      { return index == other.index; }


      inline void animate() const { frame = ( frame + 1 ) % sCount; }
      mutable int frame;
      QPersistentModelIndex index;
  };

protected:
  virtual void timerEvent(QTimerEvent *event);

private:

  mutable QSet<Animation> m_animations;
  QAbstractItemView *m_view;
  KPixmapSequence m_pixmapSequence;
  int m_timerId;
};

uint qHash(Akonadi::DelegateAnimator::Animation anim);

/**
 *
 */
class ProgressSpinnerDelegate : public QStyledItemDelegate
{
  Q_OBJECT
public:
  ProgressSpinnerDelegate(DelegateAnimator *animator, QObject* parent = 0);

protected:
  virtual void initStyleOption(QStyleOptionViewItem* option, const QModelIndex& index) const;

private:
  DelegateAnimator *m_animator;
};

}

#endif
