bool QgsVirtualLayerProvider::loadSourceLayers()
{
Q_FOREACH ( const QgsVirtualLayerDefinition::SourceLayer &layer, mDefinition.sourceLayers() )
{
if ( layer.isReferenced() )
{
QgsMapLayer *l = QgsMapLayerRegistry::instance()->mapLayer( layer.reference() );
if ( !l )
{
PROVIDER_ERROR( QString( "Cannot find layer %1" ).arg( layer.reference() ) );
return false;
}
if ( l->type() != QgsMapLayer::VectorLayer )
{
PROVIDER_ERROR( QString( "Layer %1 is not a vector layer" ).arg( layer.reference() ) );
return false;
}
// add the layer to the list
QgsVectorLayer* vl = static_cast<QgsVectorLayer*>( l );
mLayers << SourceLayer( vl, layer.name() );
// connect to modification signals to invalidate statistics
connect( vl, SIGNAL( featureAdded( QgsFeatureId ) ), this, SLOT( invalidateStatistics() ) );
connect( vl, SIGNAL( featureDeleted( QgsFeatureId ) ), this, SLOT( invalidateStatistics() ) );
connect( vl, SIGNAL( geometryChanged( QgsFeatureId, const QgsGeometry& ) ), this, SLOT( invalidateStatistics() ) );
}
else
{
void QgsVirtualLayerDefinition::addSource( const QString& name, const QString source, const QString& provider, const QString& encoding )
{
mSourceLayers.append( SourceLayer( name, source, provider, encoding ) );
}
void QgsVirtualLayerDefinition::addSource( const QString& name, const QString ref )
{
mSourceLayers.append( SourceLayer( name, ref ) );
}
