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
137 lines
2.5 KiB
C++
137 lines
2.5 KiB
C++
/*
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Copyright (C) 2001 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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$Id$
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*/
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#include <iostream>
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#include <pbd/undo.h>
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using namespace std;
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using namespace sigc;
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UndoTransaction::UndoTransaction ()
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{
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}
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UndoTransaction::UndoTransaction (const UndoTransaction& rhs)
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{
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_name = rhs._name;
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clear ();
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actions.insert(actions.end(),rhs.actions.begin(),rhs.actions.end());
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}
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UndoTransaction&
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UndoTransaction::operator= (const UndoTransaction& rhs)
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{
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if (this == &rhs) return *this;
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_name = rhs._name;
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clear ();
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actions.insert(actions.end(),rhs.actions.begin(),rhs.actions.end());
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return *this;
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}
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void
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UndoTransaction::add_command (const UndoAction& action)
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{
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actions.push_back (action);
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}
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void
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UndoTransaction::clear ()
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{
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actions.clear ();
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}
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void
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UndoTransaction::operator() ()
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{
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for (list<UndoAction>::iterator i = actions.begin(); i != actions.end(); ++i) {
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(*i)();
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}
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}
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void
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UndoTransaction::undo ()
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{
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cerr << "Undo " << _name << endl;
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for (list<UndoAction>::reverse_iterator i = actions.rbegin(); i != actions.rend(); ++i) {
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i->undo();
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}
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}
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void
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UndoTransaction::redo ()
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{
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cerr << "Redo " << _name << endl;
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(*this)();
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}
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void
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UndoHistory::add (UndoTransaction ut)
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{
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UndoList.push_back (ut);
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}
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void
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UndoHistory::undo (unsigned int n)
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{
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while (n--) {
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if (UndoList.size() == 0) {
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return;
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}
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UndoTransaction ut = UndoList.back ();
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UndoList.pop_back ();
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ut.undo ();
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RedoList.push_back (ut);
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}
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}
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void
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UndoHistory::redo (unsigned int n)
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{
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while (n--) {
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if (RedoList.size() == 0) {
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return;
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}
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UndoTransaction ut = RedoList.back ();
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RedoList.pop_back ();
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ut.redo ();
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UndoList.push_back (trans);
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}
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}
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void
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UndoHistory::clear_redo ()
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{
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RedoList.clear ();
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}
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void
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UndoHistory::clear_undo ()
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{
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UndoList.clear ();
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}
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void
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UndoHistory::clear ()
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{
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RedoList.clear ();
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UndoList.clear ();
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}
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