KD Chart 2: KDChartAbstractProxyModel.cpp Source File

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# KDChartAbstractProxyModel.cpp

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    00001 #include "KDChartAbstractProxyModel.h"
    00002
    00003 #include <QDebug>
    00004
    00005 #include <KDABLibFakes>
    00006
    00007
    00008 namespace KDChart {
    00009
    00012 AbstractProxyModel::AbstractProxyModel(QObject* parent)
    00013   : QAbstractProxyModel(parent) {}
    00014
    00015 // Think this is ugly? Well, it's not from me, it comes from QProxyModel
    00016 struct KDPrivateModelIndex
    00017 {
    00018   int r, c;
    00019   void *p;
    00020   const QAbstractItemModel *m;
    00021 };
    00022
    00023 QModelIndex AbstractProxyModel::mapFromSource( const QModelIndex & sourceIndex ) const
    00024 {
    00025   if ( !sourceIndex.isValid() )
    00026     return QModelIndex();
    00027   //qDebug() << "sourceIndex.model()="<<sourceIndex.model();
    00028   //qDebug() << "model()="<<sourceModel();
    00029   Q_ASSERT( sourceIndex.model() == sourceModel() );
    00030
    00031   // Create an index that preserves the internal pointer from the source;
    00032   // this way AbstractProxyModel preserves the structure of the source model
    00033   return createIndex( sourceIndex.row(), sourceIndex.column(), sourceIndex.internalPointer() );
    00034 }
    00035
    00036 QModelIndex AbstractProxyModel::mapToSource( const QModelIndex &proxyIndex ) const
    00037 {
    00038   if ( !proxyIndex.isValid() )
    00039     return QModelIndex();
    00040   Q_ASSERT( proxyIndex.model() == this );
    00041   // So here we need to create a source index which holds that internal pointer.
    00042   // No way to pass it to sourceModel()->index... so we have to do the ugly way:
    00043   QModelIndex sourceIndex;
    00044   KDPrivateModelIndex* hack = reinterpret_cast<KDPrivateModelIndex*>(&sourceIndex);
    00045   hack->r = proxyIndex.row();
    00046   hack->c = proxyIndex.column();
    00047   hack->p = proxyIndex.internalPointer();
    00048   hack->m = sourceModel();
    00049   Q_ASSERT( sourceIndex.isValid() );
    00050   return sourceIndex;
    00051 }
    00052
    00053 QModelIndex AbstractProxyModel::index( int row, int col, const QModelIndex& index ) const
    00054 {
    00055     Q_ASSERT(sourceModel());
    00056     return mapFromSource(sourceModel()->index( row, col, mapToSource(index) ));
    00057 }
    00058
    00059 QModelIndex AbstractProxyModel::parent( const QModelIndex& index ) const
    00060 {
    00061     Q_ASSERT(sourceModel());
    00062     return mapFromSource(sourceModel()->parent( mapToSource(index) ));
    00063 }
    00064
    00065 }