linkelementcommand.h

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/*
    Copyright 2006-2019 The QElectroTech Team
    This file is part of QElectroTech.

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

    QElectroTech 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef LINKELEMENTCOMMAND_H
#define LINKELEMENTCOMMAND_H

#include <QUndoCommand>

class Element;

class LinkElementCommand : public QUndoCommand
{
    public:
        LinkElementCommand(Element *element_, QUndoCommand *parent = nullptr);

        int id() const override {return 2;}
        bool mergeWith(const QUndoCommand *other) override;

        static bool isLinkable (Element *element_a, Element *element_b, bool already_linked = false);

        void setLink (const QList<Element *>& element_list);
        void setLink (Element *element_);
        void unlink  (QList<Element *> element_list);
        void unlinkAll ();

        void undo() override;
        void redo() override;

    private:
        void setUpNewLink (const QList<Element *> &element_list, bool already_link);
        void makeLink (const QList <Element *> &element_list);

    private:
        Element *m_element;
        bool m_first_redo;
        QList<Element *> m_linked_before; //<Linked elements before this command, or when we call "undo"
        QList<Element *> m_linked_after;  //<Linked elements after this command, or when we recall "redo"
};

#endif // LINKELEMENTCOMMAND_H