/*
- Copyright (C) 2002 Brett Viren & Paul Davis
+ 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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id$
*/
#ifndef __lib_pbd_undo_h__
#include <string>
#include <list>
+#include <map>
#include <sigc++/slot.h>
+#include <sigc++/bind.h>
#include <sys/time.h>
-using std::string;
-using std::list;
+#include "pbd/command.h"
typedef sigc::slot<void> UndoAction;
-class UndoCommand
+class UndoTransaction : public Command
{
public:
- UndoCommand ();
- UndoCommand (const UndoCommand&);
- UndoCommand& operator= (const UndoCommand&);
+ UndoTransaction ();
+ UndoTransaction (const UndoTransaction&);
+ UndoTransaction& operator= (const UndoTransaction&);
+ ~UndoTransaction ();
void clear ();
+ bool empty() const;
+ bool clearing () const { return _clearing; }
- void add_undo (const UndoAction&);
- void add_redo (const UndoAction&);
- void add_redo_no_execute (const UndoAction&);
+ void add_command (Command* const);
+ void remove_command (Command* const);
+ void operator() ();
void undo();
void redo();
-
- void set_name (const string& str) {
- _name = str;
- }
- const string& name() const { return _name; }
+
+ XMLNode &get_state();
void set_timestamp (struct timeval &t) {
_timestamp = t;
}
private:
- list<UndoAction> redo_actions;
- list<UndoAction> undo_actions;
- struct timeval _timestamp;
- string _name;
+ std::list<Command*> actions;
+ struct timeval _timestamp;
+ bool _clearing;
+
+ friend void command_death (UndoTransaction*, Command *);
+
+ void about_to_explicitly_delete ();
};
-class UndoHistory
+class UndoHistory : public PBD::ScopedConnectionList
{
public:
- UndoHistory() {}
+ UndoHistory();
~UndoHistory() {}
- void add (UndoCommand uc);
+ 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(); }
- string next_undo() const { return (UndoList.empty() ? string("") : UndoList.back().name()); }
- string next_redo() const { return (RedoList.empty() ? string("") : RedoList.back().name()); }
+ 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 ();
+ /* returns all or part of the history.
+ If depth==0 it returns just the top
+ node. If depth<0, it returns everything.
+ If depth>0, it returns state for that
+ many elements of the history, or
+ the full history, whichever is smaller.
+ */
+
+ XMLNode &get_state(int32_t depth = 0);
+ void save_state();
+
+ void set_depth (uint32_t);
+
+ PBD::Signal0<void> Changed;
+ PBD::Signal0<void> BeginUndoRedo;
+ PBD::Signal0<void> EndUndoRedo;
+
private:
- list<UndoCommand> UndoList;
- list<UndoCommand> RedoList;
+ bool _clearing;
+ uint32_t _depth;
+ std::list<UndoTransaction*> UndoList;
+ std::list<UndoTransaction*> RedoList;
+
+ void remove (UndoTransaction*);
};