/****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef PIEVIEW_H
#define PIEVIEW_H

#include <QAbstractItemView>
#include <QFont>
#include <QItemSelection>
#include <QItemSelectionModel>
#include <QModelIndex>
#include <QRect>
#include <QSize>
#include <QWidget>

class PieView : public QAbstractItemView
{
    Q_OBJECT

public:
    PieView(QWidget *parent = 0);

    QRect visualRect(const QModelIndex &index) const;
    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible);
    QModelIndex indexAt(const QPoint &point) const;

protected slots:
    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
    void rowsInserted(const QModelIndex &parent, int start, int end);
    void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end);

protected:
    bool edit(const QModelIndex &index, EditTrigger trigger, QEvent *event);
    QModelIndex moveCursor(QAbstractItemView::CursorAction cursorAction,
                           Qt::KeyboardModifiers modifiers);

    int horizontalOffset() const;
    int verticalOffset() const;

    bool isIndexHidden(const QModelIndex &index) const;

    void setSelection(const QRect&, QItemSelectionModel::SelectionFlags command);

    void mouseReleaseEvent(QMouseEvent *event);
    void paintEvent(QPaintEvent *event);
    void resizeEvent(QResizeEvent *event);
    void scrollContentsBy(int dx, int dy);

    QRegion visualRegionForSelection(const QItemSelection &selection) const;

private:
    QRect itemRect(const QModelIndex &item) const;
    QRegion itemRegion(const QModelIndex &index) const;
    int rows(const QModelIndex &index = QModelIndex()) const;
    void updateGeometries();

    int margin;
    int totalSize;
    int pieSize;
    int validItems;
    double totalValue;
    QRect selectionRect;
};

#endif
