QList<QString> QgsCategorizedSymbolRendererV2::usedAttributes() { QSet<QString> attributes; // mAttrName can contain either attribute name or an expression. // Sometimes it is not possible to distinguish between those two, // e.g. "a - b" can be both a valid attribute name or expression. // Since we do not have access to fields here, try both options. attributes << mAttrName; QgsExpression testExpr( mAttrName ); if ( !testExpr.hasParserError() ) attributes.unite( testExpr.referencedColumns().toSet() ); if ( mRotation.data() ) attributes.unite( mRotation->referencedColumns().toSet() ); if ( mSizeScale.data() ) attributes.unite( mSizeScale->referencedColumns().toSet() ); QgsCategoryList::const_iterator catIt = mCategories.constBegin(); for ( ; catIt != mCategories.constEnd(); ++catIt ) { QgsSymbolV2* catSymbol = catIt->symbol(); if ( catSymbol ) { attributes.unite( catSymbol->usedAttributes() ); } } return attributes.toList(); }
QgsLegendSymbolList QgsCategorizedSymbolRendererV2::legendSymbolItems() { QSettings settings; bool showClassifiers = settings.value( "/qgis/showLegendClassifiers", false ).toBool(); QgsLegendSymbolList lst; if ( showClassifiers ) { lst << qMakePair( classAttribute(), ( QgsSymbolV2* )0 ); } QgsCategoryList::const_iterator catIt = mCategories.constBegin(); for ( ; catIt != mCategories.constEnd(); ++catIt ) { lst << qMakePair( catIt->label(), catIt->symbol() ); } return lst; }
QList<QString> QgsCategorizedSymbolRendererV2::usedAttributes() { QgsExpression exp( mAttrName ); QSet<QString> attributes( exp.referencedColumns().toSet() ); if ( mRotation.data() ) attributes.unite( mRotation->referencedColumns().toSet() ); if ( mSizeScale.data() ) attributes.unite( mSizeScale->referencedColumns().toSet() ); QgsCategoryList::const_iterator catIt = mCategories.constBegin(); for ( ; catIt != mCategories.constEnd(); ++catIt ) { QgsSymbolV2* catSymbol = catIt->symbol(); if ( catSymbol ) { attributes.unite( catSymbol->usedAttributes() ); } } return attributes.toList(); }
QList<QString> QgsCategorizedSymbolRendererV2::usedAttributes() { QSet<QString> attributes; attributes.insert( mAttrName ); if ( !mRotationField.isEmpty() ) { attributes.insert( mRotationField ); } if ( !mSizeScaleField.isEmpty() ) { attributes.insert( mSizeScaleField ); } QgsCategoryList::const_iterator catIt = mCategories.constBegin(); for ( ; catIt != mCategories.constEnd(); ++catIt ) { QgsSymbolV2* catSymbol = catIt->symbol(); if ( catSymbol ) { attributes.unite( catSymbol->usedAttributes() ); } } return attributes.toList(); }