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pieview.h

/****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech AS. 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:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** 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

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