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( ) );
+}