void QgsVectorLayerRenderer::prepareDiagrams( QgsVectorLayer* layer, QStringList& attributeNames )
{
if ( !mContext.labelingEngine() )
return;
if ( !layer->diagramRenderer() || !layer->diagramLayerSettings() )
return;
mDiagrams = true;
const QgsDiagramRendererV2* diagRenderer = layer->diagramRenderer();
const QgsDiagramLayerSettings* diagSettings = layer->diagramLayerSettings();
mContext.labelingEngine()->addDiagramLayer( layer, diagSettings ); // will make internal copy of diagSettings + initialize it
//add attributes needed by the diagram renderer
QList<QString> att = diagRenderer->diagramAttributes();
QList<QString>::const_iterator attIt = att.constBegin();
for ( ; attIt != att.constEnd(); ++attIt )
{
QgsExpression* expression = diagRenderer->diagram()->getExpression( *attIt, &mFields );
QStringList columns = expression->referencedColumns();
QStringList::const_iterator columnsIterator = columns.constBegin();
for ( ; columnsIterator != columns.constEnd(); ++columnsIterator )
{
if ( !attributeNames.contains( *columnsIterator ) )
attributeNames << *columnsIterator;
}
}
const QgsLinearlyInterpolatedDiagramRenderer* linearlyInterpolatedDiagramRenderer = dynamic_cast<const QgsLinearlyInterpolatedDiagramRenderer*>( layer->diagramRenderer() );
if ( linearlyInterpolatedDiagramRenderer != NULL )
{
if ( linearlyInterpolatedDiagramRenderer->classificationAttributeIsExpression() )
{
QgsExpression* expression = diagRenderer->diagram()->getExpression( linearlyInterpolatedDiagramRenderer->classificationAttributeExpression(), &mFields );
QStringList columns = expression->referencedColumns();
QStringList::const_iterator columnsIterator = columns.constBegin();
for ( ; columnsIterator != columns.constEnd(); ++columnsIterator )
{
if ( !attributeNames.contains( *columnsIterator ) )
attributeNames << *columnsIterator;
}
}
else
{
QString name = mFields.at( linearlyInterpolatedDiagramRenderer->classificationAttribute() ).name();
if ( !attributeNames.contains( name ) )
attributeNames << name;
}
}
//and the ones needed for data defined diagram positions
if ( diagSettings->xPosColumn != -1 )
attributeNames << mFields.at( diagSettings->xPosColumn ).name();
if ( diagSettings->yPosColumn != -1 )
attributeNames << mFields.at( diagSettings->yPosColumn ).name();
}
bool QgsVectorLayerLabelProvider::prepare( const QgsRenderContext &context, QSet<QString> &attributeNames )
{
QgsPalLayerSettings &lyr = mSettings;
const QgsMapSettings &mapSettings = mEngine->mapSettings();
QgsDebugMsgLevel( "PREPARE LAYER " + mLayerId, 4 );
if ( lyr.drawLabels )
{
if ( lyr.fieldName.isEmpty() )
{
return false;
}
if ( lyr.isExpression )
{
QgsExpression exp( lyr.fieldName );
if ( exp.hasEvalError() )
{
QgsDebugMsgLevel( "Prepare error:" + exp.evalErrorString(), 4 );
return false;
}
}
else
{
// If we aren't an expression, we check to see if we can find the column.
if ( mFields.lookupField( lyr.fieldName ) == -1 )
{
return false;
}
}
}
lyr.mCurFields = mFields;
if ( lyr.drawLabels || lyr.obstacle )
{
if ( lyr.drawLabels )
{
// add field indices for label's text, from expression or field
if ( lyr.isExpression )
{
// prepare expression for use in QgsPalLayerSettings::registerFeature()
QgsExpression *exp = lyr.getLabelExpression();
exp->prepare( &context.expressionContext() );
if ( exp->hasEvalError() )
{
QgsDebugMsgLevel( "Prepare error:" + exp->evalErrorString(), 4 );
}
Q_FOREACH ( const QString &name, exp->referencedColumns() )
{
QgsDebugMsgLevel( "REFERENCED COLUMN = " + name, 4 );
attributeNames.insert( name );
}
}
else
{
attributeNames.insert( lyr.fieldName );
}
}
void QgsVectorLayerFeatureIterator::prepareExpressions()
{
const QList<QgsExpressionFieldBuffer::ExpressionField> exps = mSource->mExpressionFieldBuffer->expressions();
for ( int i = 0; i < mSource->mFields.count(); i++ )
{
if ( mSource->mFields.fieldOrigin( i ) == QgsFields::OriginExpression )
{
// Only prepare if there is no subset defined or the subset contains this field
if ( !( mRequest.flags() & QgsFeatureRequest::SubsetOfAttributes )
|| mRequest.subsetOfAttributes().contains( i ) )
{
int oi = mSource->mFields.fieldOriginIndex( i );
QgsExpression* exp = new QgsExpression( exps[oi].expression );
exp->prepare( mSource->mFields );
mExpressionFieldInfo.insert( i, exp );
if ( mRequest.flags() & QgsFeatureRequest::SubsetOfAttributes )
{
QgsAttributeList attrs;
Q_FOREACH( const QString& col, exp->referencedColumns() )
{
attrs.append( mSource->mFields.fieldNameIndex( col ) );
}
mRequest.setSubsetOfAttributes( mRequest.subsetOfAttributes() + attrs );
}
if ( exp->needsGeometry() )
{
mRequest.setFlags( mRequest.flags() & ~QgsFeatureRequest::NoGeometry );
}
}
}
void QgsAttributeTableModel::loadAttributes()
{
if ( !layer() )
{
return;
}
bool ins = false, rm = false;
QgsAttributeList attributes;
const QgsFields& fields = layer()->pendingFields();
for ( int idx = 0; idx < fields.count(); ++idx )
{
switch ( layer()->editType( idx ) )
{
case QgsVectorLayer::Hidden:
continue;
case QgsVectorLayer::ValueMap:
mValueMaps.insert( idx, new QMap< QString, QVariant >( layer()->valueMap( idx ) ) );
break;
case QgsVectorLayer::ValueRelation:
{
const QgsVectorLayer::ValueRelationData &data = layer()->valueRelation( idx );
QgsVectorLayer *layer = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( data.mLayer ) );
if ( !layer )
continue;
int ki = layer->fieldNameIndex( data.mKey );
int vi = layer->fieldNameIndex( data.mValue );
QgsExpression *e = 0;
if ( !data.mFilterExpression.isEmpty() )
{
e = new QgsExpression( data.mFilterExpression );
if ( e->hasParserError() || !e->prepare( layer->pendingFields() ) )
continue;
}
if ( ki >= 0 && vi >= 0 )
{
QSet<int> attributes;
attributes << ki << vi;
QgsFeatureRequest::Flag flags = QgsFeatureRequest::NoGeometry;
if ( e )
{
if ( e->needsGeometry() )
flags = QgsFeatureRequest::NoFlags;
foreach ( const QString &field, e->referencedColumns() )
{
int idx = layer->fieldNameIndex( field );
if ( idx < 0 )
continue;
attributes << idx;
}
}
QMap< QString, QVariant > *map = new QMap< QString, QVariant >();
QgsFeatureIterator fit = layer->getFeatures( QgsFeatureRequest().setFlags( flags ).setSubsetOfAttributes( attributes.toList() ) );
QgsFeature f;
while ( fit.nextFeature( f ) )
{
if ( e && !e->evaluate( &f ).toBool() )
continue;
map->insert( f.attribute( vi ).toString(), f.attribute( ki ) );
}
mValueMaps.insert( idx, map );
}
}
break;
default:
break;
}
attributes << idx;
}
bool QgsVectorLayerDiagramProvider::prepare( const QgsRenderContext& context, QStringList& attributeNames )
{
QgsDiagramLayerSettings& s2 = mSettings;
const QgsMapSettings& mapSettings = mEngine->mapSettings();
s2.ct = nullptr;
if ( mapSettings.hasCrsTransformEnabled() )
{
if ( context.coordinateTransform() )
// this is context for layer rendering - use its CT as it includes correct datum transform
s2.ct = context.coordinateTransform()->clone();
else
// otherwise fall back to creating our own CT - this one may not have the correct datum transform!
s2.ct = new QgsCoordinateTransform( mLayerCrs, mapSettings.destinationCrs() );
}
s2.xform = &mapSettings.mapToPixel();
s2.fields = mFields;
s2.renderer = mDiagRenderer;
const QgsDiagramRendererV2* diagRenderer = s2.renderer;
//add attributes needed by the diagram renderer
QList<QString> att = diagRenderer->diagramAttributes();
QList<QString>::const_iterator attIt = att.constBegin();
for ( ; attIt != att.constEnd(); ++attIt )
{
QgsExpression* expression = diagRenderer->diagram()->getExpression( *attIt, context.expressionContext() );
QStringList columns = expression->referencedColumns();
QStringList::const_iterator columnsIterator = columns.constBegin();
for ( ; columnsIterator != columns.constEnd(); ++columnsIterator )
{
if ( !attributeNames.contains( *columnsIterator ) )
attributeNames << *columnsIterator;
}
}
const QgsLinearlyInterpolatedDiagramRenderer* linearlyInterpolatedDiagramRenderer = dynamic_cast<const QgsLinearlyInterpolatedDiagramRenderer*>( diagRenderer );
if ( linearlyInterpolatedDiagramRenderer )
{
if ( linearlyInterpolatedDiagramRenderer->classificationAttributeIsExpression() )
{
QgsExpression* expression = diagRenderer->diagram()->getExpression( linearlyInterpolatedDiagramRenderer->classificationAttributeExpression(), context.expressionContext() );
QStringList columns = expression->referencedColumns();
QStringList::const_iterator columnsIterator = columns.constBegin();
for ( ; columnsIterator != columns.constEnd(); ++columnsIterator )
{
if ( !attributeNames.contains( *columnsIterator ) )
attributeNames << *columnsIterator;
}
}
else
{
QString name = mFields.at( linearlyInterpolatedDiagramRenderer->classificationAttribute() ).name();
if ( !attributeNames.contains( name ) )
attributeNames << name;
}
}
//and the ones needed for data defined diagram positions
if ( mSettings.xPosColumn != -1 )
attributeNames << mFields.at( mSettings.xPosColumn ).name();
if ( mSettings.yPosColumn != -1 )
attributeNames << mFields.at( mSettings.yPosColumn ).name();
return true;
}
