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# pieview.h Example File
itemviews/chart/pieview.h

     /****************************************************************************
     **
     ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of
     ** this file.  Please review the following information to ensure GNU
     ** General Public Licensing requirements will be met:
     ** http://www.trolltech.com/products/qt/opensource.html
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
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     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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     ****************************************************************************/

     #ifndef PIEVIEW_H
     #define PIEVIEW_H

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

     class QRubberBand;

     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 mousePressEvent(QMouseEvent *event);

         void mouseMoveEvent(QMouseEvent *event);
         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;
         QPoint origin;
         QRubberBand *rubberBand;
     };

     #endif