KDChartAbstractProxyModel.cpp

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00001 /****************************************************************************
00002 ** Copyright (C) 2001-2011 Klaralvdalens Datakonsult AB.  All rights reserved.
00003 **
00004 ** This file is part of the KD Chart library.
00005 **
00006 ** Licensees holding valid commercial KD Chart licenses may use this file in
00007 ** accordance with the KD Chart Commercial License Agreement provided with
00008 ** the Software.
00009 **
00010 **
00011 ** This file may be distributed and/or modified under the terms of the
00012 ** GNU General Public License version 2 and version 3 as published by the
00013 ** Free Software Foundation and appearing in the file LICENSE.GPL.txt included.
00014 **
00015 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
00016 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
00017 **
00018 ** Contact info@kdab.com if any conditions of this licensing are not
00019 ** clear to you.
00020 **
00021 **********************************************************************/
00022 
00023 #include "KDChartAbstractProxyModel.h"
00024 
00025 #include <QDebug>
00026 
00027 #include <KDABLibFakes>
00028 
00029 #ifdef __GNUC__
00030 #if __GNUC__ > 3
00031 #define ATTRIBUTE __attribute__((__may_alias__))
00032 #endif
00033 #else
00034 #define ATTRIBUTE
00035 #endif
00036 
00037 namespace KDChart {
00038 
00041 AbstractProxyModel::AbstractProxyModel(QObject* parent) 
00042   : QAbstractProxyModel(parent) {}
00043 
00044 // Think this is ugly? Well, it's not from me, it comes from QProxyModel
00045 struct ATTRIBUTE KDPrivateModelIndex
00046 {
00047   int r, c;
00048   void *p;
00049   const QAbstractItemModel *m;
00050 } ;
00051 
00052 QModelIndex AbstractProxyModel::mapFromSource( const QModelIndex & sourceIndex ) const
00053 {
00054   if ( !sourceIndex.isValid() )
00055     return QModelIndex();
00056   //qDebug() << "sourceIndex.model()="<<sourceIndex.model();
00057   //qDebug() << "model()="<<sourceModel();
00058   Q_ASSERT( sourceIndex.model() == sourceModel() );
00059 
00060   // Create an index that preserves the internal pointer from the source;
00061   // this way AbstractProxyModel preserves the structure of the source model
00062   return createIndex( sourceIndex.row(), sourceIndex.column(), sourceIndex.internalPointer() );
00063 }
00064 
00065 QModelIndex AbstractProxyModel::mapToSource( const QModelIndex &proxyIndex ) const
00066 {
00067   if ( !proxyIndex.isValid() )
00068     return QModelIndex();
00069   if( proxyIndex.model() != this )
00070     qDebug() << proxyIndex.model() << this;
00071   Q_ASSERT( proxyIndex.model() == this );
00072   // So here we need to create a source index which holds that internal pointer.
00073   // No way to pass it to sourceModel()->index... so we have to do the ugly way:
00074   QModelIndex sourceIndex;
00075   KDPrivateModelIndex* hack = reinterpret_cast<KDPrivateModelIndex*>(&sourceIndex);
00076   hack->r = proxyIndex.row();
00077   hack->c = proxyIndex.column();
00078   hack->p = proxyIndex.internalPointer();
00079   hack->m = sourceModel();
00080   Q_ASSERT( sourceIndex.isValid() );
00081   return sourceIndex;
00082 }
00083 
00084 QModelIndex AbstractProxyModel::index( int row, int col, const QModelIndex& index ) const
00085 {
00086     Q_ASSERT(sourceModel());
00087     return mapFromSource(sourceModel()->index( row, col, mapToSource(index) ));
00088 }
00089 
00090 QModelIndex AbstractProxyModel::parent( const QModelIndex& index ) const
00091 {
00092     Q_ASSERT(sourceModel());
00093     return mapFromSource(sourceModel()->parent( mapToSource(index) ));
00094 }
00095 
00096 }
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