6337a1894c
Coding for undo/redo starts in earnest. Paul and I decided to go with a standard gang of four Command pattern, with serialization. This overcomes the terrible difficulties we were having with static type checking and the sigc++ approach. I'm adding the requirement that each command support undo, simplifying undo/redo. NOTE that an important fallout here is that Command::operator()() is the opposite of the old UndoAction::operator()(), i.e. Command::operator()() is execute/redo, and Command::undo() is undo. This commit is a reworking of the infrastructure, and won't compile until creating Command subclasses for the various commands being performed. That is primarily where you find get_memento and/or calls to add_(undo|redo.*). git-svn-id: svn://localhost/ardour2/branches/undo@655 d708f5d6-7413-0410-9779-e7cbd77b26cf
97 lines
2.2 KiB
C++
97 lines
2.2 KiB
C++
/*
|
|
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.
|
|
|
|
$Id$
|
|
*/
|
|
|
|
#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>
|
|
|
|
using std::string;
|
|
using std::list;
|
|
|
|
typedef Command UndoAction;
|
|
|
|
class UndoTransaction : public Command
|
|
{
|
|
public:
|
|
UndoTransaction ();
|
|
UndoTransaction (const UndoTransaction&);
|
|
UndoTransaction& operator= (const UndoTransaction&);
|
|
|
|
void clear ();
|
|
|
|
void add_command (const UndoAction&);
|
|
|
|
void operator() ();
|
|
void undo();
|
|
|
|
void set_name (const string& str) {
|
|
_name = str;
|
|
}
|
|
const string& name() const { return _name; }
|
|
|
|
void set_timestamp (struct timeval &t) {
|
|
_timestamp = t;
|
|
}
|
|
|
|
const struct timeval& timestamp() const {
|
|
return _timestamp;
|
|
}
|
|
|
|
private:
|
|
list<UndoAction> actions;
|
|
struct timeval _timestamp;
|
|
string _name;
|
|
};
|
|
|
|
class UndoHistory
|
|
{
|
|
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(); }
|
|
|
|
string next_undo() const { return (UndoList.empty() ? string("") : UndoList.back().name()); }
|
|
string next_redo() const { return (RedoList.empty() ? string("") : RedoList.back().name()); }
|
|
|
|
void clear ();
|
|
void clear_undo ();
|
|
void clear_redo ();
|
|
|
|
private:
|
|
list<UndoTransaction> UndoList;
|
|
list<UndoTransaction> RedoList;
|
|
};
|
|
|
|
|
|
#endif /* __lib_pbd_undo_h__ */
|