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

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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 <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