125 lines
3.0 KiB
C++
125 lines
3.0 KiB
C++
/*
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Copyright (C) 2002 Brett Viren & Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __lib_pbd_undo_h__
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#define __lib_pbd_undo_h__
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#include <string>
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#include <list>
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#include <map>
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#include <sigc++/slot.h>
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#include <sigc++/bind.h>
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#ifndef COMPILER_MSVC
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#include <sys/time.h>
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#else
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#include <ardourext/misc.h>
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#endif
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#include "pbd/command.h"
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typedef sigc::slot<void> UndoAction;
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class UndoTransaction : public Command
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{
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public:
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UndoTransaction ();
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UndoTransaction (const UndoTransaction&);
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UndoTransaction& operator= (const UndoTransaction&);
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~UndoTransaction ();
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void clear ();
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bool empty() const;
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bool clearing () const { return _clearing; }
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void add_command (Command* const);
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void remove_command (Command* const);
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void operator() ();
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void undo();
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void redo();
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XMLNode &get_state();
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void set_timestamp (struct timeval &t) {
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_timestamp = t;
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}
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const struct timeval& timestamp() const {
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return _timestamp;
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}
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private:
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std::list<Command*> actions;
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struct timeval _timestamp;
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bool _clearing;
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friend void command_death (UndoTransaction*, Command *);
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void about_to_explicitly_delete ();
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};
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class UndoHistory : public PBD::ScopedConnectionList
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{
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public:
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UndoHistory();
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~UndoHistory() {}
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void add (UndoTransaction* ut);
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void undo (unsigned int n);
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void redo (unsigned int n);
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unsigned long undo_depth() const { return UndoList.size(); }
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unsigned long redo_depth() const { return RedoList.size(); }
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std::string next_undo() const { return (UndoList.empty() ? std::string() : UndoList.back()->name()); }
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std::string next_redo() const { return (RedoList.empty() ? std::string() : RedoList.back()->name()); }
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void clear ();
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void clear_undo ();
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void clear_redo ();
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/* returns all or part of the history.
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If depth==0 it returns just the top
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node. If depth<0, it returns everything.
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If depth>0, it returns state for that
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many elements of the history, or
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the full history, whichever is smaller.
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*/
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XMLNode &get_state(int32_t depth = 0);
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void save_state();
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void set_depth (uint32_t);
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PBD::Signal0<void> Changed;
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PBD::Signal0<void> BeginUndoRedo;
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PBD::Signal0<void> EndUndoRedo;
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private:
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bool _clearing;
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uint32_t _depth;
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std::list<UndoTransaction*> UndoList;
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std::list<UndoTransaction*> RedoList;
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void remove (UndoTransaction*);
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};
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#endif /* __lib_pbd_undo_h__ */
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