void QgsSymbolsListWidget::createAuxiliaryField()
{
// try to create an auxiliary layer if not yet created
if ( !mLayer->auxiliaryLayer() )
{
QgsNewAuxiliaryLayerDialog dlg( mLayer, this );
dlg.exec();
}
// return if still not exists
if ( !mLayer->auxiliaryLayer() )
return;
QgsPropertyOverrideButton *button = qobject_cast<QgsPropertyOverrideButton *>( sender() );
QgsSymbolLayer::Property key = static_cast< QgsSymbolLayer::Property >( button->propertyKey() );
const QgsPropertyDefinition def = QgsSymbolLayer::propertyDefinitions()[key];
// create property in auxiliary storage if necessary
if ( !mLayer->auxiliaryLayer()->exists( def ) )
mLayer->auxiliaryLayer()->addAuxiliaryField( def );
// update property with join field name from auxiliary storage
QgsProperty property = button->toProperty();
property.setField( QgsAuxiliaryLayer::nameFromProperty( def, true ) );
property.setActive( true );
button->updateFieldLists();
button->setToProperty( property );
QgsMarkerSymbol *markerSymbol = static_cast<QgsMarkerSymbol *>( mSymbol );
QgsLineSymbol *lineSymbol = static_cast<QgsLineSymbol *>( mSymbol );
switch ( key )
{
case QgsSymbolLayer::PropertyAngle:
if ( markerSymbol )
markerSymbol->setDataDefinedAngle( button->toProperty() );
break;
case QgsSymbolLayer::PropertySize:
if ( markerSymbol )
{
markerSymbol->setDataDefinedSize( button->toProperty() );
markerSymbol->setScaleMethod( QgsSymbol::ScaleDiameter );
}
break;
case QgsSymbolLayer::PropertyStrokeWidth:
if ( lineSymbol )
lineSymbol->setDataDefinedWidth( button->toProperty() );
break;
default:
break;
}
emit changed();
}
void QgsSymbolsListWidget::updateDataDefinedLineWidth()
{
QgsLineSymbol *lineSymbol = static_cast<QgsLineSymbol *>( mSymbol );
QgsProperty dd( mWidthDDBtn->toProperty() );
spinWidth->setEnabled( !mWidthDDBtn->isActive() );
QgsProperty symbolDD( lineSymbol->dataDefinedWidth() );
if ( // shall we remove datadefined expressions for layers ?
( !symbolDD && !dd )
// shall we set the "en masse" expression for properties ?
|| dd )
{
lineSymbol->setDataDefinedWidth( dd );
emit changed();
}
}
void QgsFeatureRenderer::convertSymbolSizeScale( QgsSymbol * symbol, QgsSymbol::ScaleMethod method, const QString & field )
{
if ( symbol->type() == QgsSymbol::Marker )
{
QgsMarkerSymbol * s = static_cast<QgsMarkerSymbol *>( symbol );
if ( QgsSymbol::ScaleArea == QgsSymbol::ScaleMethod( method ) )
{
const QgsDataDefined dd( "coalesce(sqrt(" + QString::number( s->size() ) + " * (" + field + ")),0)" );
s->setDataDefinedSize( dd );
}
else
{
const QgsDataDefined dd( "coalesce(" + QString::number( s->size() ) + " * (" + field + "),0)" );
s->setDataDefinedSize( dd );
}
s->setScaleMethod( QgsSymbol::ScaleDiameter );
}
else if ( symbol->type() == QgsSymbol::Line )
{
QgsLineSymbol * s = static_cast<QgsLineSymbol *>( symbol );
const QgsDataDefined dd( "coalesce(" + QString::number( s->width() ) + " * (" + field + "),0)" );
s->setDataDefinedWidth( dd );
}
}