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2024-03-06 14:54:30 +08:00
commit edac2715f0
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--- a/lib/engine/rs_undo.h
+++ b/lib/engine/rs_undo.h
@@ -0,0 +1,116 @@
+/****************************************************************************
+**
+** This file is part of the LibreCAD project, a 2D CAD program
+**
+** Copyright (C) 2018 A. Stebich (librecad@mail.lordofbikes.de)
+** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl)
+** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
+**
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU General Public License version 2 as published by the Free Software
+** Foundation and appearing in the file gpl-2.0.txt included in the
+** packaging of this file.
+**
+** This program 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 this program; if not, write to the Free Software
+** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+**
+** This copyright notice MUST APPEAR in all copies of the script!
+**
+**********************************************************************/
+
+
+#ifndef RS_UNDO_H
+#define RS_UNDO_H
+
+#include <memory>
+#include <vector>
+
+class RS_UndoCycle;
+class RS_Undoable;
+
+/**
+ * Undo / redo functionality. The internal undo list consists of
+ * RS_UndoCycle entries.
+ *
+ * @see RS_UndoCycle
+ * @author Andrew Mustun
+ */
+class RS_Undo {
+public:
+	virtual ~RS_Undo() = default;
+
+    virtual bool undo();
+    virtual bool redo();
+
+//	virtual std::shared_ptr<RS_UndoCycle> getUndoCycle();
+//	virtual std::shared_ptr<RS_UndoCycle> getRedoCycle();
+
+    virtual int countUndoCycles();
+    virtual int countRedoCycles();
+    virtual bool hasUndoable();
+
+    virtual void startUndoCycle();
+    virtual void addUndoable(RS_Undoable* u);
+    virtual void endUndoCycle();
+
+    /**
+     * Must be overwritten by the implementing class and delete
+     * the given Undoable (unrecoverable). This method is called
+     * for Undoables that are no longer in the undo buffer.
+     */
+    virtual void removeUndoable(RS_Undoable* u) = 0;
+
+    /**
+	  *\brief enable/disable redo/undo buttons in main application window
+	  *\author: Dongxu Li
+      **/
+	void setGUIButtons() const;
+
+    friend std::ostream& operator << (std::ostream& os, RS_Undo& a);
+
+    static bool test();
+
+private:
+
+	void addUndoCycle(std::shared_ptr<RS_UndoCycle> const& i);
+    //! List of undo list items. every item is something that can be undone.
+	std::vector<std::shared_ptr<RS_UndoCycle>> undoList;
+
+    /**
+     * Index that points to the current position in the undo list.
+     * The item it points on will be undone the next time undo is called.
+     * The item after will be redone (if there is an item) when redo
+     * is called.
+     */
+	int undoPointer = -1;
+
+    /**
+     * Current undo cycle.
+     */
+    std::shared_ptr<RS_UndoCycle> currentCycle {nullptr};
+
+    int refCount {0}; ///< reference counter for nested start/end calls
+};
+
+
+/**
+ * Stub for testing the RS_Undo class.
+ */
+#ifdef RS_TEST
+class RS_UndoStub : public RS_Undo {
+    virtual void removeUndoable(RS_Undoable* u) {
+        delete u;
+        u = NULL;
+    }
+};
+#endif
+
+#endif
+