cutter/src/widgets/PieView.h

/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
**     of its contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef PIEVIEW_H
#define PIEVIEW_H

#include <QAbstractItemView>

//! [0]
class PieView : public QAbstractItemView
{
    Q_OBJECT

public:
    explicit PieView(QWidget *parent = nullptr);

    QRect visualRect(const QModelIndex &index) const override;
    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) override;
    QModelIndex indexAt(const QPoint &point) const override;

public slots:
    void reset() override;

protected slots:
    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight,
                     const QVector<int> &roles = QVector<int>()) override;
    void rowsInserted(const QModelIndex &parent, int start, int end) override;
    void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) override;

protected:
    bool edit(const QModelIndex &index, EditTrigger trigger, QEvent *event) override;
    QModelIndex moveCursor(QAbstractItemView::CursorAction cursorAction,
                           Qt::KeyboardModifiers modifiers) override;

    int horizontalOffset() const override;
    int verticalOffset() const override;

    bool isIndexHidden(const QModelIndex &index) const override;

    void setSelection(const QRect &, QItemSelectionModel::SelectionFlags command) override;

    void mousePressEvent(QMouseEvent *event) override;

    void mouseMoveEvent(QMouseEvent *event) override;
    void mouseReleaseEvent(QMouseEvent *event) override;

    void paintEvent(QPaintEvent *event) override;
    void resizeEvent(QResizeEvent *event) override;
    void scrollContentsBy(int dx, int dy) override;

    QRegion visualRegionForSelection(const QItemSelection &selection) const override;

private:
    QRect itemRect(const QModelIndex &index) const;
    QRegion itemRegion(const QModelIndex &index) const;
    int rows(const QModelIndex &index = QModelIndex()) const;
    void updateGeometries() override;
    int getMin(int x, int y) const;

    int margin;
    int totalSize;
    int pieSize;
    int validItems;
    double totalValue;
    QPoint origin;
    QRubberBand *rubberBand;
};
//! [0]

#endif // PIEVIEW_H