linkelementcommand.h

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/*
        Copyright 2006-2020 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