Esempio n. 1
0
QString QgsRelationReferenceFieldFormatter::representValue( QgsVectorLayer* layer, int fieldIndex, const QVariantMap& config, const QVariant& cache, const QVariant& value ) const
{
  Q_UNUSED( cache );

  // Some sanity checks
  if ( !config.contains( QStringLiteral( "Relation" ) ) )
  {
    QgsMessageLog::logMessage( "Missing Relation in configuration" );
    return value.toString();
  }
  QgsRelation relation = QgsProject::instance()->relationManager()->relation( config[QStringLiteral( "Relation" )].toString() );
  if ( !relation.isValid() )
  {
    QgsMessageLog::logMessage( "Invalid relation" );
    return value.toString();
  }
  QgsVectorLayer* referencingLayer = relation.referencingLayer();
  if ( layer != referencingLayer )
  {
    QgsMessageLog::logMessage( "representValue() with inconsistent layer parameter w.r.t relation referencingLayer" );
    return value.toString();
  }
  int referencingFieldIdx = referencingLayer->fields().lookupField( relation.fieldPairs().at( 0 ).first );
  if ( referencingFieldIdx != fieldIndex )
  {
    QgsMessageLog::logMessage( "representValue() with inconsistent fieldIndex parameter w.r.t relation referencingFieldIdx" );
    return value.toString();
  }
  QgsVectorLayer* referencedLayer = relation.referencedLayer();
  if ( !referencedLayer )
  {
    QgsMessageLog::logMessage( "Cannot find referenced layer" );
    return value.toString();
  }

  // Attributes from the referencing layer
  QgsAttributes attrs = QgsAttributes( layer->fields().count() );
  // Set the value on the foreign key field of the referencing record
  attrs[ referencingFieldIdx ] = value;

  QgsFeatureRequest request = relation.getReferencedFeatureRequest( attrs );
  QgsFeature feature;
  referencedLayer->getFeatures( request ).nextFeature( feature );
  if ( !feature.isValid() )
    return value.toString();

  QgsExpression expr( referencedLayer->displayExpression() );
  QgsExpressionContext context;
  context << QgsExpressionContextUtils::globalScope()
  << QgsExpressionContextUtils::projectScope()
  << QgsExpressionContextUtils::layerScope( referencedLayer );
  context.setFeature( feature );
  QString title = expr.evaluate( &context ).toString();
  if ( expr.hasEvalError() )
  {
    int referencedFieldIdx = referencedLayer->fields().lookupField( relation.fieldPairs().at( 0 ).second );
    title = feature.attribute( referencedFieldIdx ).toString();
  }
  return title;
}
Esempio n. 2
0
void QgsRelReferenceConfigDlg::on_mComboRelation_indexChanged( int idx )
{
  QString relName = mComboRelation->itemData( idx ).toString();
  QgsRelation rel = QgsProject::instance()->relationManager()->relation( relName );

  QgsVectorLayer* referencedLayer = rel.referencedLayer();
  if ( referencedLayer )
  {
    mTxtDisplayExpression->setText( referencedLayer->displayExpression() );
  }
}
Esempio n. 3
0
QString QgsMapTip::fetchFeature( QgsMapLayer *layer, QgsPoint &mapPosition, QgsMapCanvas *mapCanvas )
{
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( layer );
  if ( !vlayer )
    return QString();

  double searchRadius = QgsMapTool::searchRadiusMU( mapCanvas );

  QgsRectangle r;
  r.setXMinimum( mapPosition.x() - searchRadius );
  r.setYMinimum( mapPosition.y() - searchRadius );
  r.setXMaximum( mapPosition.x() + searchRadius );
  r.setYMaximum( mapPosition.y() + searchRadius );

  r = mapCanvas->mapSettings().mapToLayerCoordinates( layer, r );

  QgsFeature feature;

  if ( !vlayer->getFeatures( QgsFeatureRequest().setFilterRect( r ).setFlags( QgsFeatureRequest::ExactIntersect ) ).nextFeature( feature ) )
    return QString();

  QgsExpressionContext context( QgsExpressionContextUtils::globalProjectLayerScopes( vlayer ) );
  if ( mapCanvas )
    context.appendScope( QgsExpressionContextUtils::mapSettingsScope( mapCanvas->mapSettings() ) );

  context.setFeature( feature );

  QString mapTip = vlayer->mapTipTemplate();
  if ( !mapTip.isEmpty() )
  {
    return QgsExpression::replaceExpressionText( mapTip, &context );
  }
  else
  {
    QgsExpression exp( vlayer->displayExpression() );
    return exp.evaluate( &context ).toString();
  }
}
Esempio n. 4
0
void QgsServerProjectParser::addLayerProjectSettings( QDomElement& layerElem, QDomDocument& doc, QgsMapLayer* currentLayer ) const
{
  if ( !currentLayer )
  {
    return;
  }
  // Layer tree name
  QDomElement treeNameElem = doc.createElement( "TreeName" );
  QDomText treeNameText = doc.createTextNode( currentLayer->name() );
  treeNameElem.appendChild( treeNameText );
  layerElem.appendChild( treeNameElem );

  if ( currentLayer->type() == QgsMapLayer::VectorLayer )
  {
    QgsVectorLayer* vLayer = static_cast<QgsVectorLayer*>( currentLayer );
    const QSet<QString>& excludedAttributes = vLayer->excludeAttributesWms();

    int displayFieldIdx = -1;
    QString displayField = "maptip";
    QgsExpression exp( vLayer->displayExpression() );
    if ( exp.isField() )
    {
      displayField = static_cast<const QgsExpression::NodeColumnRef*>( exp.rootNode() )->name();
      displayFieldIdx = vLayer->fieldNameIndex( displayField );
    }

    //attributes
    QDomElement attributesElem = doc.createElement( "Attributes" );
    const QgsFields& layerFields = vLayer->pendingFields();
    for ( int idx = 0; idx < layerFields.count(); ++idx )
    {
      QgsField field = layerFields.at( idx );
      if ( excludedAttributes.contains( field.name() ) )
      {
        continue;
      }
      // field alias in case of displayField
      if ( idx == displayFieldIdx )
      {
        displayField = vLayer->attributeDisplayName( idx );
      }
      QDomElement attributeElem = doc.createElement( "Attribute" );
      attributeElem.setAttribute( "name", field.name() );
      attributeElem.setAttribute( "type", QVariant::typeToName( field.type() ) );
      attributeElem.setAttribute( "typeName", field.typeName() );
      QString alias = vLayer->attributeAlias( idx );
      if ( !alias.isEmpty() )
      {
        attributeElem.setAttribute( "alias", alias );
      }

      //edit type to text
      attributeElem.setAttribute( "editType", vLayer->editFormConfig()->widgetType( idx ) );
      attributeElem.setAttribute( "comment", field.comment() );
      attributeElem.setAttribute( "length", field.length() );
      attributeElem.setAttribute( "precision", field.precision() );
      attributesElem.appendChild( attributeElem );
    }
    //displayfield
    layerElem.setAttribute( "displayField", displayField );

    //geometry type
    layerElem.setAttribute( "geometryType", QgsWkbTypes::displayString( vLayer->wkbType() ) );

    layerElem.appendChild( attributesElem );
  }
}