Material: add workbench manipulator

Implement a workbench manipulator to inject Std_Material and Std_Appearance to (context) menu.

src/Mod/Material/Gui/WorkbenchManipulator.h

@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+/***************************************************************************
+ *   Copyright (c) 2024 Werner Mayer <wmayer[at]users.sourceforge.net>     *
+ *                                                                         *
+ *   This file is part of FreeCAD.                                         *
+ *                                                                         *
+ *   FreeCAD is free software: you can redistribute it and/or modify it    *
+ *   under the terms of the GNU Lesser General Public License as           *
+ *   published by the Free Software Foundation, either version 2.1 of the  *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   FreeCAD 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      *
+ *   Lesser General Public License for more details.                       *
+ *                                                                         *
+ *   You should have received a copy of the GNU Lesser General Public      *
+ *   License along with FreeCAD. If not, see                               *
+ *   <https://www.gnu.org/licenses/>.                                      *
+ *                                                                         *
+ **************************************************************************/
+
+
+#ifndef MATGUI_WORKBENCHMANIPULATOR_H
+#define MATGUI_WORKBENCHMANIPULATOR_H
+
+#include <Gui/WorkbenchManipulator.h>
+
+namespace MatGui {
+
+class WorkbenchManipulator: public Gui::WorkbenchManipulator
+{
+protected:
+    /*!
+     * \brief modifyMenuBar
+     * Adds the commands Std_SetMaterial and Std_SetAppearance to the View menu
+     */
+    void modifyMenuBar(Gui::MenuItem* menuBar) override;
+    /*!
+     * \brief modifyContextMenu
+     * Adds the commands Std_SetMaterial and Std_SetAppearance to the contex-menu
+     */
+    void modifyContextMenu(const char* recipient, Gui::MenuItem* menuBar) override;
+
+private:
+    static void addCommands(Gui::MenuItem* menuBar, const char* reference);
+    static void addCommandsToTree(Gui::MenuItem* menuBar);
+};
+
+} // namespace MatGui
+
+
+#endif // MATGUI_WORKBENCHMANIPULATOR_H