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/*
**************************************************************************
description
--------------------
copyright : (C) 2000-2001 by Andreas Zehender
email : zehender@kde.org
**************************************************************************
**************************************************************************
* *
* 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. *
* *
**************************************************************************/
#include "pmdatachangecommand.h"
#include "pmcommandmanager.h"
#include "pmmemento.h"
#include "pmobject.h"
#include <klocale.h>
PMDataChangeCommand::PMDataChangeCommand( PMMemento* memento )
: PMCommand( )
{
QString text = memento->originator( )->name( );
if( text.isEmpty( ) )
text = memento->originator( )->description( );
setText( i18n( "Change %1" ).arg( text ) );
// the data is already changed when the command is created
m_executed = true;
m_unexecuted = false;
m_pOldState = memento;
m_pNewState = 0;
}
PMDataChangeCommand::~PMDataChangeCommand( )
{
if( m_pOldState )
delete m_pOldState;
if( m_pNewState )
delete m_pNewState;
}
void PMDataChangeCommand::execute( PMCommandManager* theManager )
{
PMObject* obj = m_pOldState->originator( );
if( !m_executed )
{
// if the command is not executed
// restore the memento
if( m_pNewState )
{
if( m_pNewState->containsChanges( ) )
{
obj->restoreMemento( m_pNewState );
if( m_pOldState->idChanged( ) )
theManager->cmdIDChanged( obj, m_pOldState->oldID( ) );
signalChanges( theManager, m_pNewState );
}
}
m_executed = true;
}
else if( !m_unexecuted )
{
// the data can be changed multiple times
// if the command was never unexecuted, emit the signal
// ( the data was already changed, so this is not necessary here )
if( m_pOldState->idChanged( ) )
theManager->cmdIDChanged( obj, m_pOldState->oldID( ) );
signalChanges( theManager, m_pOldState );
}
}
void PMDataChangeCommand::undo( PMCommandManager* theManager )
{
if( m_executed )
{
if( m_pOldState->containsChanges( ) )
{
PMObject* obj = m_pOldState->originator( );
if( !m_pNewState )
obj->createMemento( );
obj->restoreMemento( m_pOldState );
if( !m_pNewState )
m_pNewState = obj->takeMemento( );
if( m_pNewState->idChanged( ) )
theManager->cmdIDChanged( obj, m_pNewState->oldID( ) );
signalChanges( theManager, m_pOldState );
}
m_executed = false;
m_unexecuted = true;
}
}
void PMDataChangeCommand::signalChanges( PMCommandManager* theManager,
PMMemento* memento )
{
PMObjectChangeListIterator it( memento->changedObjects( ) );
for( ; it.current( ); ++it )
theManager->cmdObjectChanged( it.current( )->object( ),
it.current( )->mode( ) );
}
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