rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 108 insertions, 0 deletions

diff --git a/libs/pbd/pbd/undo.h b/libs/pbd/pbd/undo.h
new file mode 100644
index 0000000000..8f1716d09f
--- /dev/null
+++ b/libs/pbd/pbd/undo.h
@@ -0,0 +1,108 @@
+/* 
+    Copyright (C) 2002 Brett Viren & Paul Davis
+
+    This program 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.
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __lib_pbd_undo_h__
+#define __lib_pbd_undo_h__
+
+#include <string>
+#include <list>
+#include <map>
+#include <sigc++/slot.h>
+#include <sigc++/bind.h>
+#include <sys/time.h>
+#include <pbd/command.h>
+
+typedef sigc::slot<void> UndoAction;
+
+class UndoTransaction : public Command
+{
+  public:
+	UndoTransaction ();
+	UndoTransaction (const UndoTransaction&);
+	UndoTransaction& operator= (const UndoTransaction&);
+	~UndoTransaction ();
+
+	void clear ();
+	bool empty() const;
+	bool clearing () const { return _clearing; }
+
+	void add_command (Command* const);
+	void remove_command (Command* const);
+
+	void operator() ();
+	void undo();
+	void redo();
+
+	XMLNode &get_state();
+
+	void set_timestamp (struct timeval &t) {
+		_timestamp = t;
+	}
+
+	const struct timeval& timestamp() const {
+		return _timestamp;
+	}
+
+  private:
+	std::list<Command*>    actions;
+	struct timeval        _timestamp;
+	bool                  _clearing;
+
+	friend void command_death (UndoTransaction*, Command *);
+};
+
+class UndoHistory : public sigc::trackable
+{
+  public:
+	UndoHistory();
+	~UndoHistory() {}
+	
+	void add (UndoTransaction* ut);
+	void undo (unsigned int n);
+	void redo (unsigned int n);
+	
+	unsigned long undo_depth() const { return UndoList.size(); }
+	unsigned long redo_depth() const { return RedoList.size(); }
+	
+	std::string next_undo() const { return (UndoList.empty() ? std::string() : UndoList.back()->name()); }
+	std::string next_redo() const { return (RedoList.empty() ? std::string() : RedoList.back()->name()); }
+
+	void clear ();
+	void clear_undo ();
+	void clear_redo ();
+
+        XMLNode &get_state(int32_t depth = 0);
+        void save_state();
+
+	void set_depth (int32_t);
+	int32_t get_depth() const { return _depth; }
+
+	sigc::signal<void> Changed;
+	
+  private:
+	bool _clearing;
+	int32_t _depth;
+	std::list<UndoTransaction*> UndoList;
+	std::list<UndoTransaction*> RedoList;
+
+	void remove (UndoTransaction*);
+};
+
+
+#endif /* __lib_pbd_undo_h__ */