diff options
Diffstat (limited to 'kpovmodeler/pmdatachangecommand.cpp')
-rw-r--r-- | kpovmodeler/pmdatachangecommand.cpp | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/kpovmodeler/pmdatachangecommand.cpp b/kpovmodeler/pmdatachangecommand.cpp new file mode 100644 index 00000000..0793986e --- /dev/null +++ b/kpovmodeler/pmdatachangecommand.cpp @@ -0,0 +1,111 @@ +/* +************************************************************************** + 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( ) ); +} |