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