source: trunk/examples/itemviews/chart/pieview.h@ 651

/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 1.1, 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 have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#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