void QgsVectorLayerJoinBuffer::createJoinCaches()
{
QList< QgsVectorJoinInfo >::iterator joinIt = mVectorJoins.begin();
for ( ; joinIt != mVectorJoins.end(); ++joinIt )
{
cacheJoinLayer( *joinIt );
}
}
void QgsVectorLayerJoinBuffer::addJoin( const QgsVectorJoinInfo& joinInfo )
{
mVectorJoins.push_back( joinInfo );
//cache joined layer to virtual memory if specified by user
if ( joinInfo.memoryCache )
{
cacheJoinLayer( mVectorJoins.last() );
}
}
void QgsVectorLayerJoinBuffer::createJoinCaches()
{
QList< QgsVectorJoinInfo >::iterator joinIt = mVectorJoins.begin();
for ( ; joinIt != mVectorJoins.end(); ++joinIt )
{
cacheJoinLayer( *joinIt );
// make sure we are connected to the joined layer
if ( QgsVectorLayer* vl = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( joinIt->joinLayerId ) ) )
connect( vl, SIGNAL( updatedFields() ), this, SLOT( joinedLayerUpdatedFields() ), Qt::UniqueConnection );
}
}
void QgsVectorLayerJoinBuffer::joinedLayerUpdatedFields()
{
QgsVectorLayer* joinedLayer = qobject_cast<QgsVectorLayer*>( sender() );
Q_ASSERT( joinedLayer );
// recache the joined layer
for ( QgsVectorJoinList::iterator it = mVectorJoins.begin(); it != mVectorJoins.end(); ++it )
{
if ( joinedLayer->id() == it->joinLayerId )
{
it->cachedAttributes.clear();
cacheJoinLayer( *it );
}
}
emit joinedFieldsChanged();
}
void QgsVectorLayerJoinBuffer::addJoin( const QgsVectorJoinInfo& joinInfo )
{
mVectorJoins.push_back( joinInfo );
//cache joined layer to virtual memory if specified by user
if ( joinInfo.memoryCache )
{
cacheJoinLayer( mVectorJoins.last() );
}
// Wait for notifications about changed fields in joined layer to propagate them.
// During project load the joined layers possibly do not exist yet so the connection will not be created,
// but then QgsProject makes sure to call createJoinCaches() which will do the connection.
// Unique connection makes sure we do not respond to one layer's update more times (in case of multiple join)
if ( QgsVectorLayer* vl = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( joinInfo.joinLayerId ) ) )
connect( vl, SIGNAL( updatedFields() ), this, SLOT( joinedLayerUpdatedFields() ), Qt::UniqueConnection );
emit joinedFieldsChanged();
}
