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livetrax/libs/pbd/undo.cc

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/*
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 <string>
#include <sstream>
#include <time.h>
#include "pbd/undo.h"
#include "pbd/xml++.h"
#include <sigc++/bind.h>
using namespace std;
using namespace sigc;
UndoTransaction::UndoTransaction ()
: _clearing(false)
{
gettimeofday (&_timestamp, 0);
}
UndoTransaction::UndoTransaction (const UndoTransaction& rhs)
: Command(rhs._name)
, _clearing(false)
{
_timestamp = rhs._timestamp;
clear ();
actions.insert(actions.end(),rhs.actions.begin(),rhs.actions.end());
}
UndoTransaction::~UndoTransaction ()
{
drop_references ();
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 cmd)
{
/* catch death of command (e.g. caused by death of object to
which it refers. command_death() is a normal static function
so there is no need to manage this connection.
*/
cmd->DropReferences.connect_same_thread (*this, boost::bind (&command_death, this, cmd));
actions.push_back (cmd);
}
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");
node->set_property("tv-sec", (int64_t)_timestamp.tv_sec);
node->set_property("tv-usec", (int64_t)_timestamp.tv_usec);
node->set_property("name", _name);
list<Command*>::iterator it;
for (it=actions.begin(); it!=actions.end(); it++)
node->add_child_nocopy((*it)->get_state());
return *node;
}
class UndoRedoSignaller {
public:
UndoRedoSignaller (UndoHistory& uh)
: _history (uh) {
_history.BeginUndoRedo();
}
~UndoRedoSignaller() {
_history.EndUndoRedo();
}
private:
UndoHistory& _history;
};
UndoHistory::UndoHistory ()
{
_clearing = false;
_depth = 0;
}
void
UndoHistory::set_depth (uint32_t d)
{
UndoTransaction* ut;
uint32_t current_depth = UndoList.size();
_depth = d;
if (d > current_depth) {
/* not even transactions to meet request */
return;
}
if (_depth > 0) {
uint32_t cnt = current_depth - d;
while (cnt--) {
ut = UndoList.front();
UndoList.pop_front ();
delete ut;
}
}
}
void
UndoHistory::add (UndoTransaction* const ut)
{
uint32_t current_depth = UndoList.size();
ut->DropReferences.connect_same_thread (*this, boost::bind (&UndoHistory::remove, this, ut));
/* if the current undo history is larger than or equal to the currently
requested depth, then pop off at least 1 element to make space
at the back for new one.
*/
if ((_depth > 0) && current_depth && (current_depth >= _depth)) {
uint32_t cnt = 1 + (current_depth - _depth);
while (cnt--) {
UndoTransaction* ut;
ut = UndoList.front ();
UndoList.pop_front ();
delete ut;
}
}
UndoList.push_back (ut);
/* Adding a transacrion makes the redo list meaningless. */
_clearing = true;
for (std::list<UndoTransaction*>::iterator i = RedoList.begin(); i != RedoList.end(); ++i) {
delete *i;
}
RedoList.clear ();
_clearing = false;
/* we are now owners of the transaction and must delete it when finished with it */
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::remove (UndoTransaction* const ut)
{
if (_clearing) {
return;
}
UndoList.remove (ut);
RedoList.remove (ut);
Changed (); /* EMIT SIGNAL */
}
/** Undo some transactions.
* @param n Number of transactions to undo.
*/
void
UndoHistory::undo (unsigned int n)
{
if (n == 0) {
return;
}
{
UndoRedoSignaller exception_safe_signaller (*this);
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)
{
if (n == 0) {
return;
}
{
UndoRedoSignaller exception_safe_signaller (*this);
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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;
for (std::list<UndoTransaction*>::iterator i = RedoList.begin(); i != RedoList.end(); ++i) {
delete *i;
}
RedoList.clear ();
_clearing = false;
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::clear_undo ()
{
_clearing = true;
for (std::list<UndoTransaction*>::iterator i = UndoList.begin(); i != UndoList.end(); ++i) {
delete *i;
}
UndoList.clear ();
_clearing = false;
Changed (); /* EMIT SIGNAL */
}
void
UndoHistory::clear ()
{
clear_undo ();
clear_redo ();
Changed (); /* EMIT SIGNAL */
}
XMLNode&
UndoHistory::get_state (int32_t depth)
{
XMLNode *node = new XMLNode ("UndoHistory");
if (depth == 0) {
return (*node);
} else if (depth < 0) {
/* everything */
for (list<UndoTransaction*>::iterator it = UndoList.begin(); it != UndoList.end(); ++it) {
node->add_child_nocopy((*it)->get_state());
}
} else {
/* just the last "depth" transactions */
list<UndoTransaction*> in_order;
for (list<UndoTransaction*>::reverse_iterator it = UndoList.rbegin(); it != UndoList.rend() && depth; ++it, depth--) {
in_order.push_front (*it);
}
for (list<UndoTransaction*>::iterator it = in_order.begin(); it != in_order.end(); it++) {
node->add_child_nocopy((*it)->get_state());
}
}
return *node;
}