linedelegate.h

/*
   Copyright (C) 2020 Denis Gofman - <sendevent@gmail.com>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program. If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
*/

#pragma once

#include <QPen>
#include <QStyledItemDelegate>

class LineDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    LineDelegate(QObject *parent = nullptr);

    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
    bool editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option,
                     const QModelIndex &index) override;

private:
    QPen m_linePen;
    QPoint m_startPoint;
    QModelIndex m_startIndex;

    void handleMousePress(QMouseEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option,
                          const QModelIndex &index);
    void handleMouseMove(QMouseEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option,
                         const QModelIndex &index);
    void handleMouseRelease(QMouseEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option,
                            const QModelIndex &index);
};