1 files changed, 144 insertions, 0 deletions
diff --git a/libs/pbd3/undo.cc b/libs/pbd3/undo.cc
new file mode 100644
index 0000000000..0af1cc2e7a
--- /dev/null
+++ b/libs/pbd3/undo.cc
@@ -0,0 +1,144 @@
+/* 
+    Copyright (C) 2001 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.
+
+    $Id$
+*/
+
+#include <iostream>
+
+#include <pbd/undo.h>
+
+using namespace std;
+using namespace sigc;
+
+UndoCommand::UndoCommand ()
+{
+}
+
+UndoCommand::UndoCommand (const UndoCommand& rhs)
+{
+	_name = rhs._name;
+	clear ();
+	undo_actions.insert(undo_actions.end(),rhs.undo_actions.begin(),rhs.undo_actions.end());
+	redo_actions.insert(redo_actions.end(),rhs.redo_actions.begin(),rhs.redo_actions.end());
+}
+
+UndoCommand& 
+UndoCommand::operator= (const UndoCommand& rhs)
+{
+	if (this == &rhs) return *this;
+	_name = rhs._name;
+	clear ();
+	undo_actions.insert(undo_actions.end(),rhs.undo_actions.begin(),rhs.undo_actions.end());
+	redo_actions.insert(redo_actions.end(),rhs.redo_actions.begin(),rhs.redo_actions.end());
+	return *this;
+}
+
+void
+UndoCommand::add_undo (const UndoAction& action)
+{
+	undo_actions.push_back (action);
+}
+
+void
+UndoCommand::add_redo (const UndoAction& action)
+{
+	redo_actions.push_back (action);
+	redo_actions.back()(); // operator()
+}
+
+void
+UndoCommand::add_redo_no_execute (const UndoAction& action)
+{
+	redo_actions.push_back (action);
+}
+
+void
+UndoCommand::clear ()
+{
+	undo_actions.clear ();
+	redo_actions.clear ();
+}
+
+void
+UndoCommand::undo ()
+{
+	for (list<UndoAction>::reverse_iterator i = undo_actions.rbegin(); i != undo_actions.rend(); ++i) {
+		(*i)();
+	}
+}
+
+void
+UndoCommand::redo ()
+{
+	for (list<UndoAction>::iterator i = redo_actions.begin(); i != redo_actions.end(); ++i) {
+		(*i)();
+	}
+}
+
+void
+UndoHistory::add (UndoCommand uc)
+{
+	UndoList.push_back (uc);
+}
+
+void
+UndoHistory::undo (unsigned int n)
+{
+	while (n--) {
+		if (UndoList.size() == 0) {
+			return;
+		}
+		UndoCommand uc = UndoList.back ();
+		UndoList.pop_back ();
+		uc.undo ();
+		RedoList.push_back (uc);
+	}
+}
+
+void
+UndoHistory::redo (unsigned int n)
+{
+	while (n--) {
+		if (RedoList.size() == 0) {
+			return;
+		}
+		UndoCommand cmd = RedoList.back ();
+		RedoList.pop_back ();
+		cmd.redo ();
+		UndoList.push_back (cmd);
+	}
+}
+
+void
+UndoHistory::clear_redo ()
+{
+	RedoList.clear ();
+}
+
+void
+UndoHistory::clear_undo ()
+{
+	UndoList.clear ();
+}
+
+void
+UndoHistory::clear ()
+{
+	RedoList.clear ();
+	UndoList.clear ();
+}