150 lines
3.4 KiB
C++
150 lines
3.4 KiB
C++
/*
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* Copyright (C) 2002 Brett Viren
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* Copyright (C) 2006-2015 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2006 Hans Fugal <hans@fugal.net>
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* Copyright (C) 2007-2009 David Robillard <d@drobilla.net>
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* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
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*
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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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*
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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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 <list>
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#include <map>
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#include <string>
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#include <sigc++/bind.h>
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#include <sigc++/slot.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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#include "pbd/libpbd_visibility.h"
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namespace PBD {
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typedef sigc::slot<void> UndoAction;
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class LIBPBD_API UndoTransaction : public PBD::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 {
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return _clearing;
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}
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void add_command (PBD::Command* const);
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void remove_command (PBD::Command* const);
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std::list<PBD::Command*>::size_type size() const { return actions.size(); }
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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 () const;
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void set_timestamp (struct timeval& t)
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{
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_timestamp = t;
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}
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const struct timeval& timestamp () const
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{
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return _timestamp;
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}
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private:
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std::list<PBD::Command*> actions;
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struct timeval _timestamp;
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bool _clearing;
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void about_to_explicitly_delete ();
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};
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class LIBPBD_API 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
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{
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return UndoList.size ();
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}
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unsigned long redo_depth () const
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{
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return RedoList.size ();
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}
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std::string next_undo () const
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{
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return (UndoList.empty () ? std::string () : UndoList.back ()->name ());
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}
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std::string next_redo () const
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{
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return (RedoList.empty () ? std::string () : RedoList.back ()->name ());
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}
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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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} /* namespace */
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#endif /* __lib_pbd_undo_h__ */
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