vreplacingcmd.cpp

/* This file is part of the KDE project
   Copyright (C) 2002, The Karbon Developers
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
 
   This library 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
   Library General Public License for more details.
 
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
*/
 
 
#include "vreplacingcmd.h"
#include "vselection.h"
#include "vdocument.h"
 
VReplacingCmd::VReplacingCmd( VDocument* doc, const TQString& name )
    : VCommand( doc, name )
{
    // Set members.
    m_oldObjects = doc ? document()->selection()->clone() : 0L;
    m_newObjects = 0L;
}
 
VReplacingCmd::~VReplacingCmd()
{
    delete( m_oldObjects );
    delete( m_newObjects );
}
 
void
VReplacingCmd::execute()
{
    // Did we have at least once a success? Otherwise we don't get inserted
    // into the command history.
    bool successful = false;
 
 
    // Create new shapes if they don't exist yet.
    if( !m_newObjects )
    {
        m_newObjects = new VSelection();
 
        // Pointer to temporary object.
        VObject* newObject;
 
        VObjectListIterator itr( m_oldObjects->objects() );
        VObjectList rejects;
 
        for( ; itr.current(); ++itr )
        {
            // Clone object and visit the clone.
            newObject = itr.current()->clone();
 
            // Success.
            if( visit( *newObject ) )
            {
                successful = true;
 
                // Insert new shape right before old shape.
                itr.current()->parent()->insertInfrontOf(
                    newObject, itr.current() );
 
                // Add new shape to list of new objects.
                m_newObjects->append( newObject );
            }
            // No success.
            else
            {
                rejects.append( itr.current() );
                // Delete temporary object.
                delete( newObject );
            }
        }
        VObjectListIterator jtr( rejects );
        for( ; jtr.current(); ++jtr )
        {
            // Don't consider this object in the future anymore.
            m_oldObjects->take( *jtr.current() );
        }
    }
 
    // Nothing to do.
    if( m_newObjects->objects().count() == 0 )
        return;
 
 
    VObjectListIterator itr( m_oldObjects->objects() );
 
    // Hide old objects.
    for( ; itr.current(); ++itr )
    {
        document()->selection()->take( *itr.current() );
        itr.current()->setState( VObject::deleted );
    }
 
    // Show new objects.
    for( itr = m_newObjects->objects(); itr.current(); ++itr )
    {
        itr.current()->setState( VObject::normal );
        document()->selection()->append( itr.current() );
    }
 
 
    // Tell command history wether we had success at least once.
    setSuccess( successful );
}
 
void
VReplacingCmd::unexecute()
{
    // Nothing to do.
    if( m_newObjects->objects().count() == 0 )
        return;
 
 
    VObjectListIterator itr( m_oldObjects->objects() );
 
    // Show old objects.
    for( ; itr.current(); ++itr )
    {
        itr.current()->setState( VObject::normal );
        document()->selection()->append( itr.current() );
    }
 
    // Hide new objects.
    for( itr = m_newObjects->objects(); itr.current(); ++itr )
    {
        document()->selection()->take( *itr.current() );
        itr.current()->setState( VObject::deleted );
    }
 
 
    // Reset success for command history.
    setSuccess( false );
}