First draft of elements renumber function.

sources/autoNum/renumberelementscommand.h

@@ -0,0 +1,70 @@
+/*
+    Copyright 2006-2026 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 RENUMBERELEMENTSCOMMAND_H
+#define RENUMBERELEMENTSCOMMAND_H
+
+#include <QUndoCommand>
+#include <QHash>
+#include <QVector>
+
+#include "../diagramcontext.h"
+#include "assignvariables.h" // defines autonum::sequentialNumbers
+
+class Element;
+class QETProject;
+
+/**
+ * @brief Undoable renumbering of element labels and sequence structs.
+ */
+class RenumberElementsCommand final : public QUndoCommand
+{
+public:
+    struct ElementChange
+    {
+        Element *element = nullptr;
+        DiagramContext old_infos;
+        DiagramContext new_infos;
+        autonum::sequentialNumbers old_seq;
+        autonum::sequentialNumbers new_seq;
+        bool old_frozen = false;
+        bool new_frozen = false;
+    };
+
+    RenumberElementsCommand(
+            QETProject *project,
+            QVector<ElementChange> changes,
+            QHash<QString, NumerotationContext> old_ctx,
+            QHash<QString, NumerotationContext> new_ctx,
+            const QString &text);
+
+    void undo() override;
+    void redo() override;
+
+private:
+    void apply(bool use_new);
+
+private:
+    QETProject *project_ = nullptr;
+    QVector<ElementChange> changes_;
+    QHash<QString, NumerotationContext> old_ctx_;
+    QHash<QString, NumerotationContext> new_ctx_;
+    bool first_redo_ = true;
+};
+
+#endif // RENUMBERELEMENTSCOMMAND_H