Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef PIEVIEW_H
+#define PIEVIEW_H
+
+#include <QAbstractItemView>
+#include <QFont>
+#include <QItemSelection>
+#include <QItemSelectionModel>
+#include <QModelIndex>
+#include <QRect>
+#include <QSize>
+#include <QPoint>
+#include <QWidget>
+
+QT_BEGIN_NAMESPACE
+class QRubberBand;
+QT_END_NAMESPACE
+
+//! [0]
+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;
+};
+//! [0]
+
+#endif