terminal function can be edited, edted value is applied to element

sources/undocommand/changeelementdatacommand.h

@@ -0,0 +1,38 @@
+/*
+        Copyright 2006-2021 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 CHANGEELEMENTDATACOMMAND_H
+#define CHANGEELEMENTDATACOMMAND_H
+
+#include <../properties/elementdata.h>
+#include <QUndoCommand>
+
+class Element;
+
+class ChangeElementDataCommand : public QUndoCommand
+{
+    public:
+        ChangeElementDataCommand(Element *element, ElementData new_data);
+        void undo() override;
+        void redo() override;
+
+    private:
+        QPointer<Element> m_element;
+        ElementData m_old_data, m_new_data;
+};
+
+#endif // CHANGEELEMENTDATACOMMAND_H