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The new ResourceListModel implements a ResourceModel to be used with QListView & friends. It provides all items of the given ResourceDB as a flat unsorted list. It'll be mainly used for the upcoming QuickLoadDialog. ResourceListModel features an internal lookup table, resulting in very good performance when filtering (even with thousands of items).
138 lines
3.0 KiB
C++
138 lines
3.0 KiB
C++
/*
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* ResourceListModel.cpp - implementation of ResourceListModel
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*
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* Copyright (c) 2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#include "ResourceListModel.h"
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ResourceListModel::ResourceListModel( ResourceDB * _db, QObject * _parent ) :
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ResourceModel( _db, _parent ),
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m_lookupTable()
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{
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connect( db(), SIGNAL( itemsChanged() ),
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this, SLOT( updateLookupTable() ),
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Qt::DirectConnection );
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updateLookupTable();
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}
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int ResourceListModel::rowCount( const QModelIndex & _parent ) const
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{
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Q_UNUSED(_parent);
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// return number of non-hidden items
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return m_lookupTable.size();
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}
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QModelIndex ResourceListModel::index( int _row, int _col,
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const QModelIndex & _parent ) const
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{
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if( _row < m_lookupTable.size() )
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{
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return createIndex( _row, _col, m_lookupTable[_row]->relation() );
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}
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return QModelIndex();
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}
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void ResourceListModel::setFilter( const QString & _s )
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{
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if( !_s.isEmpty() )
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{
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m_filterKeywords = _s.toLower().split( " " );
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}
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else
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{
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m_filterKeywords.clear();
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}
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updateLookupTable();
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}
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// update lookup table so ResourceListModel::index(...) can run with O(1)
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void ResourceListModel::updateLookupTable()
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{
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int items = 0;
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if( m_filterKeywords.isEmpty() )
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{
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// unhide all items if empty filter string given
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m_lookupTable.resize( db()->items().size() );
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foreach( ResourceItem * item, db()->items() )
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{
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item->setHidden( false, this );
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m_lookupTable[items] = item;
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++items;
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}
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}
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else
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{
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// filter and count number of non-hidden items
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foreach( ResourceItem * item, db()->items() )
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{
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if( item->keywordMatch( m_filterKeywords ) )
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{
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item->setHidden( false, this );
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++items;
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}
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else
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{
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item->setHidden( true, this );
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}
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}
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// resize our lookup table accordingly
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m_lookupTable.resize( items );
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// fill the lookup table
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items = 0;
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foreach( ResourceItem * item, db()->items() )
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{
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// insert all items that are not hidden due to filtering
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if( !item->isHidden( this ) )
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{
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m_lookupTable[items] = item;
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++items;
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}
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}
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}
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// finally notify view about changed data
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emit layoutChanged();
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}
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#include "moc_ResourceListModel.cxx"
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/* vim: set tw=0 noexpandtab: */
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