13
0
livetrax/libs/pbd/undo.cc

250 lines
4.5 KiB
C++

/*
Copyright (C) 2001 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.
$Id$
*/
#include <iostream>
#include <string>
#include <sstream>
#include <pbd/undo.h>
#include <pbd/xml++.h>
#include <pbd/shiva.h>
#include <sigc++/bind.h>
using namespace std;
using namespace sigc;
UndoTransaction::UndoTransaction ()
{
_clearing = false;
}
UndoTransaction::UndoTransaction (const UndoTransaction& rhs)
{
_name = rhs._name;
_clearing = false;
clear ();
actions.insert(actions.end(),rhs.actions.begin(),rhs.actions.end());
}
UndoTransaction::~UndoTransaction ()
{
GoingAway ();
clear ();
}
void
command_death (UndoTransaction* ut, Command* c)
{
if (ut->clearing()) {
return;
}
ut->remove_command (c);
if (ut->empty()) {
delete ut;
}
}
UndoTransaction&
UndoTransaction::operator= (const UndoTransaction& rhs)
{
if (this == &rhs) return *this;
_name = rhs._name;
clear ();
actions.insert(actions.end(),rhs.actions.begin(),rhs.actions.end());
return *this;
}
void
UndoTransaction::add_command (Command *const action)
{
/* catch death */
new PBD::ProxyShiva<Command,UndoTransaction> (*action, *this, &command_death);
actions.push_back (action);
}
void
UndoTransaction::remove_command (Command* const action)
{
actions.remove (action);
}
bool
UndoTransaction::empty () const
{
return actions.empty();
}
void
UndoTransaction::clear ()
{
_clearing = true;
for (list<Command*>::iterator i = actions.begin(); i != actions.end(); ++i) {
delete *i;
}
actions.clear ();
_clearing = false;
}
void
UndoTransaction::operator() ()
{
for (list<Command*>::iterator i = actions.begin(); i != actions.end(); ++i) {
(*(*i))();
}
}
void
UndoTransaction::undo ()
{
for (list<Command*>::reverse_iterator i = actions.rbegin(); i != actions.rend(); ++i) {
(*i)->undo();
}
}
void
UndoTransaction::redo ()
{
(*this)();
}
XMLNode &UndoTransaction::get_state()
{
XMLNode *node = new XMLNode ("UndoTransaction");
stringstream ss;
ss << _timestamp.tv_sec;
node->add_property("tv_sec", ss.str());
ss.str("");
ss << _timestamp.tv_usec;
node->add_property("tv_usec", ss.str());
node->add_property("name", _name);
list<Command*>::iterator it;
for (it=actions.begin(); it!=actions.end(); it++)
node->add_child_nocopy((*it)->get_state());
return *node;
}
UndoHistory::UndoHistory ()
{
_clearing = false;
}
void
UndoHistory::add (UndoTransaction* const ut)
{
ut->GoingAway.connect (bind (mem_fun (*this, &UndoHistory::remove), ut));
UndoList.push_back (ut);
/* we are now owners of the transaction */
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::remove (UndoTransaction* const ut)
{
if (_clearing) {
return;
}
UndoList.remove (ut);
RedoList.remove (ut);
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::undo (unsigned int n)
{
while (n--) {
if (UndoList.size() == 0) {
return;
}
UndoTransaction* ut = UndoList.back ();
UndoList.pop_back ();
ut->undo ();
RedoList.push_back (ut);
}
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::redo (unsigned int n)
{
while (n--) {
if (RedoList.size() == 0) {
return;
}
UndoTransaction* ut = RedoList.back ();
RedoList.pop_back ();
ut->redo ();
UndoList.push_back (ut);
}
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::clear_redo ()
{
_clearing = true;
RedoList.clear ();
_clearing = false;
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::clear_undo ()
{
_clearing = true;
UndoList.clear ();
_clearing = false;
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::clear ()
{
clear_undo ();
clear_redo ();
Changed (); /* EMIT SIGNAL */
}
XMLNode & UndoHistory::get_state()
{
XMLNode *node = new XMLNode ("UndoHistory");
list<UndoTransaction*>::iterator it;
for (it = UndoList.begin(); it != UndoList.end(); it++) {
node->add_child_nocopy((*it)->get_state());
}
return *node;
}