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akonadi

flatcollectionproxymodel.cpp

00001 /*
00002     Copyright (c) 2008 Volker Krause <vkrause@kde.org>
00003 
00004     This library is free software; you can redistribute it and/or modify it
00005     under the terms of the GNU Library General Public License as published by
00006     the Free Software Foundation; either version 2 of the License, or (at your
00007     option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful, but WITHOUT
00010     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00011     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00012     License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to the
00016     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017     02110-1301, USA.
00018 */
00019 
00020 #include "flatcollectionproxymodel_p.h"
00021 
00022 #include <kdebug.h>
00023 
00024 using namespace Akonadi;
00025 
00029 class FlatCollectionProxyModel::Private
00030 {
00031   public:
00032     Private( FlatCollectionProxyModel* parent ) : q( parent ) {}
00033 
00034     // ### SLOW!
00035     static int totalCount( QAbstractItemModel *model, const QModelIndex &index )
00036     {
00037       Q_ASSERT( model );
00038       const int rows = model->rowCount( index );
00039       int count = rows;
00040       for ( int i = 0; i < rows; ++i ) {
00041         QModelIndex current = model->index( i, 0, index );
00042         if ( current.isValid() )
00043           count += totalCount( model, current );
00044       }
00045       return count;
00046     }
00047 
00048     // ### EVEN SLOWER, and even called multiple times in a row!
00049     static QModelIndex findSourceIndex( QAbstractItemModel *model, int _row, int col, const QModelIndex &parent = QModelIndex() )
00050     {
00051       int row = _row;
00052       Q_ASSERT( model );
00053       for ( int i = 0; i <= row; ++i ) {
00054         QModelIndex current = model->index( i, col, parent );
00055         if ( i == row )
00056           return current;
00057         const int childCount = totalCount( model, current );
00058         if ( childCount >= ( row - i ) )
00059           return findSourceIndex( model, row - i - 1, col, current );
00060         else
00061           row -= childCount;
00062       }
00063       Q_ASSERT( false );
00064       return QModelIndex();
00065     }
00066 
00067     void sourceDataChanged( const QModelIndex &sourceTopLeft, const QModelIndex &sourceBottomRight )
00068     {
00069       if ( sourceTopLeft != sourceBottomRight ) {
00070         emit q->dataChanged( q->mapFromSource( sourceTopLeft ), q->mapFromSource( sourceBottomRight ) );
00071       } else {
00072         const QModelIndex proxyIndex = q->mapFromSource( sourceTopLeft );
00073         emit q->dataChanged( proxyIndex, proxyIndex );
00074       }
00075     }
00076 
00077     FlatCollectionProxyModel *q;
00078 };
00079 
00080 FlatCollectionProxyModel::FlatCollectionProxyModel(QObject * parent) :
00081     QAbstractProxyModel( parent ),
00082     d( new Private( this ) )
00083 {
00084 }
00085 
00086 FlatCollectionProxyModel::~FlatCollectionProxyModel()
00087 {
00088   delete d;
00089 }
00090 
00091 void FlatCollectionProxyModel::setSourceModel(QAbstractItemModel * sourceModel)
00092 {
00093   QAbstractProxyModel::setSourceModel( sourceModel );
00094   connect( sourceModel, SIGNAL(modelReset()), SIGNAL(modelReset()) );
00095   connect( sourceModel, SIGNAL(layoutChanged()), SIGNAL(layoutChanged()) );
00096   connect( sourceModel, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
00097            SLOT(sourceDataChanged(QModelIndex,QModelIndex)) );
00098 }
00099 
00100 int FlatCollectionProxyModel::rowCount(const QModelIndex & parent) const
00101 {
00102   if ( parent.isValid() )
00103     return 0;
00104   return d->totalCount( sourceModel(), mapToSource( parent ) );
00105 }
00106 
00107 int FlatCollectionProxyModel::columnCount(const QModelIndex & parent) const
00108 {
00109   return sourceModel()->columnCount( mapToSource( parent ) );
00110 }
00111 
00112 QModelIndex FlatCollectionProxyModel::index(int row, int column, const QModelIndex & parent) const
00113 {
00114   Q_UNUSED( parent );
00115   return createIndex( row, column );
00116 }
00117 
00118 QModelIndex FlatCollectionProxyModel::parent(const QModelIndex & index) const
00119 {
00120   Q_UNUSED( index );
00121   return QModelIndex();
00122 }
00123 
00124 QModelIndex FlatCollectionProxyModel::mapToSource(const QModelIndex & proxyIndex) const
00125 {
00126   if ( !proxyIndex.isValid() )
00127     return QModelIndex();
00128   return d->findSourceIndex( sourceModel(), proxyIndex.row(), proxyIndex.column() );
00129 }
00130 
00131 QModelIndex FlatCollectionProxyModel::mapFromSource(const QModelIndex & sourceIndex) const
00132 {
00133   if ( !sourceIndex.isValid() )
00134     return QModelIndex();
00135   int row = 0;
00136   QModelIndex current = sourceIndex;
00137   while ( current.parent() != QModelIndex() ) {
00138     row += current.row() + 1;
00139     for ( int i = current.row() - 1; i >= 0; --i )
00140       row += d->totalCount( sourceModel(), sourceModel()->index( i, 0, current.parent() ) );
00141     current = current.parent();
00142   }
00143   row += current.row();
00144   for ( int i = current.row() - 1; i >= 0; --i )
00145     row += d->totalCount( sourceModel(), sourceModel()->index( i, 0 ) );
00146   return createIndex( row, sourceIndex.column() );
00147 }
00148 
00149 QVariant FlatCollectionProxyModel::data(const QModelIndex & index, int role) const
00150 {
00151   if ( role == Qt::DisplayRole ) {
00152     QModelIndex sourceIndex = mapToSource( index );
00153     QString name = sourceIndex.data( role ).toString();
00154     sourceIndex = sourceIndex.parent();
00155     while ( sourceIndex.isValid() ) {
00156       name.prepend( sourceIndex.data( role ).toString() + QLatin1String( "/" ) );
00157       sourceIndex = sourceIndex.parent();
00158     }
00159     return name;
00160   }
00161   return QAbstractProxyModel::data( index, role );
00162 }
00163 
00164 #include "flatcollectionproxymodel_p.moc"

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