* Move TreeModel filtering to TreeProxyModel.

src/libtomahawk/database/databasecommand_allartists.cpp

@@ -82,7 +82,6 @@ DatabaseCommand_AllArtists::exec( DatabaseImpl* dbi )
         al << artist;
     }
 
-    if ( al.count() )
-        emit artists( al );
+    emit artists( al );
     emit done();
 }

src/libtomahawk/playlist/treemodel.cpp

@@ -528,7 +528,6 @@ TreeModel::addAllCollections()
 
     emit loadingStarted();
     DatabaseCommand_AllArtists* cmd = new DatabaseCommand_AllArtists();
-    cmd->setFilter( m_filter );
 
     connect( cmd, SIGNAL( artists( QList<Tomahawk::artist_ptr> ) ),
                     SLOT( onArtistsAdded( QList<Tomahawk::artist_ptr> ) ) );
@@ -579,7 +578,6 @@ TreeModel::addTracks( const album_ptr& album, const QModelIndex& parent )
     emit loadingStarted();
     DatabaseCommand_AllTracks* cmd = new DatabaseCommand_AllTracks( m_collection );
     cmd->setAlbum( album.data() );
-//    cmd->setArtist( album->artist().data() );
 
     QList< QVariant > rows;
     rows << parent.row();
@@ -602,7 +600,6 @@ TreeModel::addCollection( const collection_ptr& collection )
 
     m_collection = collection;
     DatabaseCommand_AllArtists* cmd = new DatabaseCommand_AllArtists( collection );
-    cmd->setFilter( m_filter );
 
     connect( cmd, SIGNAL( artists( QList<Tomahawk::artist_ptr> ) ),
                     SLOT( onArtistsAdded( QList<Tomahawk::artist_ptr> ) ) );
@@ -644,6 +641,7 @@ TreeModel::addFilteredCollection( const collection_ptr& collection, unsigned int
 void
 TreeModel::onArtistsAdded( const QList<Tomahawk::artist_ptr>& artists )
 {
+    emit loadingFinished();
     if ( !artists.count() )
         return;
 
@@ -663,7 +661,6 @@ TreeModel::onArtistsAdded( const QList<Tomahawk::artist_ptr>& artists )
     }
 
     emit endInsertRows();
-    emit loadingFinished();
 }
 
 
@@ -785,19 +782,6 @@ TreeModel::infoSystemInfo( Tomahawk::InfoSystem::InfoRequestData requestData, QV
 }
 
 
-void
-TreeModel::setFilter( const QString& pattern )
-{
-    m_filter = pattern;
-    clear();
-
-    if ( !m_collection.isNull() )
-        addCollection( m_collection );
-    else
-        addAllCollections();
-}
-
-
 void
 TreeModel::infoSystemFinished( QString target )
 {

src/libtomahawk/playlist/treemodel.h

@@ -81,6 +81,8 @@ public:
 
     virtual QPersistentModelIndex currentItem() { return m_currentIndex; }
 
+    Tomahawk::collection_ptr collection() const { return m_collection; }
+
     void addAllCollections();
     void addCollection( const Tomahawk::collection_ptr& collection );
     void addFilteredCollection( const Tomahawk::collection_ptr& collection, unsigned int amount, DatabaseCommand_AllArtists::SortOrder order );
@@ -99,9 +101,6 @@ public:
     virtual void setTitle( const QString& title ) { m_title = title; }
     virtual void setDescription( const QString& description ) { m_description = description; }
 
-    virtual QString filter() const { return m_filter; }
-    virtual void setFilter( const QString& pattern );
-
     TreeModelItem* itemFromIndex( const QModelIndex& index ) const
     {
         if ( index.isValid() )
@@ -154,9 +153,10 @@ private:
     QString m_description;
     ColumnStyle m_columnStyle;
 
+    QList<Tomahawk::artist_ptr> m_artistsFilter;
+
     Tomahawk::collection_ptr m_collection;
     QHash<qlonglong, QPersistentModelIndex> m_coverHash;
-    QString m_filter;
 };
 
 #endif // ALBUMMODEL_H

src/libtomahawk/playlist/treeproxymodel.cpp

@@ -21,6 +21,7 @@
 #include <QListView>
 
 #include "query.h"
+#include "database/database.h"
 #include "utils/logger.h"
 
 
@@ -63,11 +64,27 @@ TreeProxyModel::setSourceTreeModel( TreeModel* sourceModel )
 void
 TreeProxyModel::setFilter( const QString& pattern )
 {
-    PlaylistInterface::setFilter( pattern );
-    setFilterRegExp( pattern );
-    m_model->setFilter( pattern );
+    m_filter = pattern;
 
-    emit filterChanged( pattern );
+    DatabaseCommand_AllArtists* cmd = new DatabaseCommand_AllArtists( m_model->collection() );
+    cmd->setFilter( pattern );
+
+    connect( cmd, SIGNAL( artists( QList<Tomahawk::artist_ptr> ) ),
+                    SLOT( onFilterArtists( QList<Tomahawk::artist_ptr> ) ) );
+
+    Database::instance()->enqueue( QSharedPointer<DatabaseCommand>( cmd ) );
+}
+
+
+void
+TreeProxyModel::onFilterArtists( const QList<Tomahawk::artist_ptr>& artists )
+{
+    m_artistsFilter = artists;
+
+    PlaylistInterface::setFilter( m_filter );
+    setFilterRegExp( m_filter );
+
+    emit filterChanged( m_filter );
     emit trackCountChanged( trackCount() );
 }
 
@@ -112,6 +129,10 @@ TreeProxyModel::filterAcceptsRow( int sourceRow, const QModelIndex& sourceParent
         m_cache.insertMulti( sourceParent, pi->result() );
     }
 
+    if ( !filterRegExp().isEmpty() && !pi->artist().isNull() )
+    {
+        return m_artistsFilter.contains( pi->artist() );
+    }
     return true;
 
     QStringList sl = filterRegExp().pattern().split( " ", QString::SkipEmptyParts );

src/libtomahawk/playlist/treeproxymodel.h

@@ -82,11 +82,17 @@ protected:
     bool filterAcceptsRow( int sourceRow, const QModelIndex& sourceParent ) const;
     bool lessThan( const QModelIndex& left, const QModelIndex& right ) const;
 
+private slots:
+    void onFilterArtists( const QList<Tomahawk::artist_ptr>& artists );
+
 private:
     QString textForItem( TreeModelItem* item ) const;
 
     mutable QMap< QPersistentModelIndex, Tomahawk::result_ptr > m_cache;
 
+    QList<Tomahawk::artist_ptr> m_artistsFilter;
+    QString m_filter;
+
     TreeModel* m_model;
     RepeatMode m_repeatMode;
     bool m_shuffled;