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git-svn-id: svn://svn.icculus.org/netradiant/trunk@1 61c419a2-8eb2-4b30-bcec-8cead039b335

include/iundo.h

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+/*
+Copyright (C) 2001-2006, William Joseph.
+All Rights Reserved.
+
+This file is part of GtkRadiant.
+
+GtkRadiant 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.
+
+GtkRadiant 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 GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined(INCLUDED_IUNDO_H)
+#define INCLUDED_IUNDO_H
+
+/// \file
+/// \brief The undo-system interface. Uses the 'memento' pattern.
+
+#include <cstddef>
+#include "generic/constant.h"
+#include "generic/callbackfwd.h"
+
+class UndoMemento
+{
+public:
+  virtual void release() = 0;
+};
+
+class Undoable
+{
+public:
+  virtual UndoMemento* exportState() const = 0;
+  virtual void importState(const UndoMemento* state) = 0;
+};
+
+class UndoObserver
+{
+public:
+  virtual void save(Undoable* undoable) = 0;
+};
+
+class UndoTracker
+{
+public:
+  virtual void clear() = 0;
+  virtual void begin() = 0;
+  virtual void undo() = 0;
+  virtual void redo() = 0;
+};
+
+class UndoSystem
+{
+public:
+  INTEGER_CONSTANT(Version, 1);
+  STRING_CONSTANT(Name, "undo");
+
+  virtual UndoObserver* observer(Undoable* undoable) = 0;
+  virtual void release(Undoable* undoable) = 0;
+
+  virtual std::size_t size() const = 0;
+  virtual void start() = 0;
+  virtual void finish(const char* command) = 0;
+  virtual void undo() = 0;
+  virtual void redo() = 0;
+  virtual void clear() = 0;
+
+  virtual void trackerAttach(UndoTracker& tracker) = 0;
+  virtual void trackerDetach(UndoTracker& tracker) = 0;
+};
+
+#include "modulesystem.h"
+
+template<typename Type>
+class GlobalModule;
+typedef GlobalModule<UndoSystem> GlobalUndoModule;
+
+template<typename Type>
+class GlobalModuleRef;
+typedef GlobalModuleRef<UndoSystem> GlobalUndoModuleRef;
+
+inline UndoSystem& GlobalUndoSystem()
+{
+  return GlobalUndoModule::getTable();
+}
+
+class UndoableCommand
+{
+  const char* m_command;
+public:
+  UndoableCommand(const char* command) : m_command(command)
+  {
+    GlobalUndoSystem().start();
+  }
+  ~UndoableCommand()
+  {
+    GlobalUndoSystem().finish(m_command);
+  }
+};
+
+
+#endif