void QgsComposerAttributeTableV2::setRelationId( const QString relationId )
{
  if ( relationId == mRelationId )
  {
    //no change
    return;
  }

  QgsVectorLayer* prevLayer = sourceLayer();
  mRelationId = relationId;
  QgsRelation relation = QgsProject::instance()->relationManager()->relation( mRelationId );
  QgsVectorLayer* newLayer = relation.referencingLayer();

  if ( mSource == QgsComposerAttributeTableV2::RelationChildren && newLayer != prevLayer )
  {
    if ( prevLayer )
    {
      //disconnect from previous layer
      disconnect( prevLayer, SIGNAL( layerModified() ), this, SLOT( refreshAttributes() ) );
    }

    //rebuild column list to match all columns from layer
    resetColumns();

    //listen for modifications to layer and refresh table when they occur
    connect( newLayer, SIGNAL( layerModified() ), this, SLOT( refreshAttributes() ) );
  }

  refreshAttributes();
  emit changed();
}
void QgsRelationReferenceWidgetWrapper::initWidget( QWidget *editor )
{
  QgsRelationReferenceWidget *w = dynamic_cast<QgsRelationReferenceWidget *>( editor );
  if ( !w )
  {
    w = new QgsRelationReferenceWidget( editor );
  }

  mWidget = w;

  mWidget->setEditorContext( context(), mCanvas, mMessageBar );

  bool showForm = config( QStringLiteral( "ShowForm" ), false ).toBool();
  bool mapIdent = config( QStringLiteral( "MapIdentification" ), false ).toBool();
  bool readOnlyWidget = config( QStringLiteral( "ReadOnly" ), false ).toBool();
  bool orderByValue = config( QStringLiteral( "OrderByValue" ), false ).toBool();
  bool showOpenFormButton = config( QStringLiteral( "ShowOpenFormButton" ), true ).toBool();

  mWidget->setEmbedForm( showForm );
  mWidget->setReadOnlySelector( readOnlyWidget );
  mWidget->setAllowMapIdentification( mapIdent );
  mWidget->setOrderByValue( orderByValue );
  mWidget->setOpenFormButtonVisible( showOpenFormButton );
  if ( config( QStringLiteral( "FilterFields" ), QVariant() ).isValid() )
  {
    mWidget->setFilterFields( config( QStringLiteral( "FilterFields" ) ).toStringList() );
    mWidget->setChainFilters( config( QStringLiteral( "ChainFilters" ) ).toBool() );
  }
  mWidget->setAllowAddFeatures( config( QStringLiteral( "AllowAddFeatures" ), false ).toBool() );

  const QVariant relationName = config( QStringLiteral( "Relation" ) );

  QgsRelation relation; // invalid relation by default
  if ( relationName.isValid() )
    relation = QgsProject::instance()->relationManager()->relation( relationName.toString() );
  else if ( ! layer()->referencingRelations( fieldIdx() ).isEmpty() )
    relation = layer()->referencingRelations( fieldIdx() )[0];

  // If this widget is already embedded by the same relation, reduce functionality
  const QgsAttributeEditorContext *ctx = &context();
  do
  {
    if ( ctx->relation().name() == relation.name() )
    {
      mWidget->setEmbedForm( false );
      mWidget->setReadOnlySelector( false );
      mWidget->setAllowMapIdentification( false );
      break;
    }
    ctx = ctx->parentContext();
  }
  while ( ctx );

  mWidget->setRelation( relation, config( QStringLiteral( "AllowNULL" ) ).toBool() );

  connect( mWidget, &QgsRelationReferenceWidget::foreignKeyChanged, this, &QgsRelationReferenceWidgetWrapper::foreignKeyChanged );
}
Exemplo n.º 3
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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() );
  }
}
Exemplo n.º 4
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void QgsRelReferenceConfigDlg::previewExpressionBuilder()
{
  QString relName = mComboRelation->itemData( mComboRelation->currentIndex() ).toString();
  QgsRelation relation = QgsProject::instance()->relationManager()->relation( relName );

  // Show expression builder
  QgsExpressionBuilderDialog dlg( relation.referencedLayer(), mTxtDisplayExpression->text() , this );
  dlg.setWindowTitle( tr( "Preview Expression" ) );

  if ( dlg.exec() == QDialog::Accepted )
  {
    mTxtDisplayExpression->setText( dlg.expressionText() );
  }
}
void QgsRelationEditorWidget::setRelations( const QgsRelation& relation, const QgsRelation& nmrelation )
{
  if ( mRelation.isValid() )
  {
    disconnect( mRelation.referencingLayer(), SIGNAL( editingStarted() ), this, SLOT( updateButtons() ) );
    disconnect( mRelation.referencingLayer(), SIGNAL( editingStopped() ), this, SLOT( updateButtons() ) );
  }

  if ( mNmRelation.isValid() )
  {
    disconnect( mNmRelation.referencedLayer(), SIGNAL( editingStarted() ), this, SLOT( updateButtons() ) );
    disconnect( mNmRelation.referencedLayer(), SIGNAL( editingStopped() ), this, SLOT( updateButtons() ) );
  }

  mRelation = relation;
  mNmRelation = nmrelation;

  if ( !mRelation.isValid() )
    return;

  connect( mRelation.referencingLayer(), SIGNAL( editingStarted() ), this, SLOT( updateButtons() ) );
  connect( mRelation.referencingLayer(), SIGNAL( editingStopped() ), this, SLOT( updateButtons() ) );

  if ( mNmRelation.isValid() )
  {
    connect( mNmRelation.referencingLayer(), SIGNAL( editingStarted() ), this, SLOT( updateButtons() ) );
    connect( mNmRelation.referencingLayer(), SIGNAL( editingStopped() ), this, SLOT( updateButtons() ) );
  }

  setTitle( relation.name() );

  QgsVectorLayer* lyr = relation.referencingLayer();

  bool canChangeAttributes = lyr->dataProvider()->capabilities() & QgsVectorDataProvider::ChangeAttributeValues;
  if ( canChangeAttributes && !lyr->isReadOnly() )
  {
    mToggleEditingButton->setEnabled( true );
    updateButtons();
  }
  else
  {
    mToggleEditingButton->setEnabled( false );
  }

  setObjectName( mRelation.name() );
  loadState();

  updateUi();
}
void QgsRelationReferenceWidgetWrapper::initWidget( QWidget* editor )
{
  QgsRelationReferenceWidget* w = dynamic_cast<QgsRelationReferenceWidget*>( editor );
  if ( !w )
  {
    w = new QgsRelationReferenceWidget( editor );
  }

  mWidget = w;

  mWidget->setEditorContext( context(), mCanvas, mMessageBar );

  bool showForm = config( "ShowForm", true ).toBool();
  bool mapIdent = config( "MapIdentification", false ).toBool();
  bool readOnlyWidget = config( "ReadOnly", false ).toBool();
  bool orderByValue = config( "OrderByValue", false ).toBool();

  mWidget->setEmbedForm( showForm );
  mWidget->setReadOnlySelector( readOnlyWidget );
  mWidget->setAllowMapIdentification( mapIdent );
  mWidget->setOrderByValue( orderByValue );
  if ( config( "FilterFields", QVariant() ).isValid() )
  {
    mWidget->setFilterFields( config( "FilterFields" ).toStringList() );
    mWidget->setChainFilters( config( "ChainFilters" ).toBool() );
  }
  mWidget->setAllowAddFeatures( config( "AllowAddFeatures", false ).toBool() );

  QgsRelation relation = QgsProject::instance()->relationManager()->relation( config( "Relation" ).toString() );

  // If this widget is already embedded by the same relation, reduce functionality
  const QgsAttributeEditorContext* ctx = &context();
  do
  {
    if ( ctx->relation().name() == relation.name() )
    {
      mWidget->setEmbedForm( false );
      mWidget->setReadOnlySelector( false );
      mWidget->setAllowMapIdentification( false );
    }
    ctx = ctx->parentContext();
  }
  while ( ctx );

  mWidget->setRelation( relation, config( "AllowNULL" ).toBool() );

  connect( mWidget, SIGNAL( foreignKeyChanged( QVariant ) ), this,  SLOT( foreignKeyChanged( QVariant ) ) );
}
QgsVectorLayer *QgsComposerAttributeTableV2::sourceLayer()
{
  switch ( mSource )
  {
    case QgsComposerAttributeTableV2::AtlasFeature:
      return mComposition->atlasComposition().coverageLayer();
    case QgsComposerAttributeTableV2::LayerAttributes:
      return mVectorLayer;
    case QgsComposerAttributeTableV2::RelationChildren:
    {
      QgsRelation relation = QgsProject::instance()->relationManager()->relation( mRelationId );
      return relation.referencingLayer();
    }
  }
  return 0;
}
Exemplo n.º 8
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QgsEditorWidgetConfig QgsRelReferenceConfigDlg::config()
{
  QgsEditorWidgetConfig myConfig;
  myConfig.insert( "AllowNULL", mCbxAllowNull->isChecked() );
  myConfig.insert( "ShowForm", mCbxShowForm->isChecked() );
  myConfig.insert( "Relation", mComboRelation->itemData( mComboRelation->currentIndex() ) );

  QString relName = mComboRelation->itemData( mComboRelation->currentIndex() ).toString();
  QgsRelation relation = QgsProject::instance()->relationManager()->relation( relName );

  if ( relation.isValid() )
  {
    relation.referencedLayer()->setDisplayExpression( mTxtDisplayExpression->text() );
  }

  return myConfig;
}
Exemplo n.º 9
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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;
}
Exemplo n.º 10
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void QgsRelationEditorWidget::setRelationFeature( const QgsRelation& relation, const QgsFeature& feature )
{
  if ( mRelation.isValid() )
  {
    disconnect( mRelation.referencingLayer(), SIGNAL( editingStarted() ), this, SLOT( updateButtons() ) );
    disconnect( mRelation.referencingLayer(), SIGNAL( editingStopped() ), this, SLOT( updateButtons() ) );
  }

  mRelation = relation;
  mFeature = feature;

  connect( mRelation.referencingLayer(), SIGNAL( editingStarted() ), this, SLOT( updateButtons() ) );
  connect( mRelation.referencingLayer(), SIGNAL( editingStopped() ), this, SLOT( updateButtons() ) );

  setTitle( relation.name() );

  QgsVectorLayer* lyr = relation.referencingLayer();

  bool canChangeAttributes = lyr->dataProvider()->capabilities() & QgsVectorDataProvider::ChangeAttributeValues;
  if ( canChangeAttributes && !lyr->isReadOnly() )
  {
    mToggleEditingButton->setEnabled( true );
    updateButtons();
  }
  else
  {
    mToggleEditingButton->setEnabled( false );
  }

  setObjectName( mRelation.name() );
  loadState();

  // If not yet initialized, it is not (yet) visible, so we don't load it to be faster (lazy loading)
  // If it is already initialized, it has been set visible before and the currently shown feature is changing
  // and the widget needs updating

  if ( mVisible )
  {
    QgsFeatureRequest myRequest = mRelation.getRelatedFeaturesRequest( mFeature );

    mDualView->init( mRelation.referencingLayer(), nullptr, myRequest, mEditorContext );
  }
}
Exemplo n.º 11
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void QgsRelationWidgetWrapper::initWidget( QWidget* editor )
{
  QgsRelationEditorWidget* w = dynamic_cast<QgsRelationEditorWidget*>( editor );

  // if the editor cannot be cast to relation editor, insert a new one
  if ( !w )
  {
    w = new QgsRelationEditorWidget( editor );
    w->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
    if ( ! editor->layout() )
    {
      editor->setLayout( new QGridLayout() );
    }
    editor->layout()->addWidget( w );
  }

  QgsAttributeEditorContext myContext( QgsAttributeEditorContext( context(), mRelation, QgsAttributeEditorContext::Multiple, QgsAttributeEditorContext::Embed ) );

  w->setEditorContext( myContext );

  QgsRelation nmrel = QgsProject::instance()->relationManager()->relation( config( "nm-rel" ).toString() );

  // If this widget is already embedded by the same relation, reduce functionality
  const QgsAttributeEditorContext* ctx = &context();
  do
  {
    if (( ctx->relation().name() == mRelation.name() && ctx->formMode() == QgsAttributeEditorContext::Embed )
        || ctx->relation().name() == nmrel.name() )
    {
      w->setVisible( false );
      break;
    }
    ctx = ctx->parentContext();
  }
  while ( ctx );


  w->setRelations( mRelation, nmrel );

  mWidget = w;
}
void QgsRelationReferenceWidget::setRelation( const QgsRelation& relation, bool allowNullValue )
{
  mAllowNull = allowNullValue;
  mRemoveFKButton->setVisible( allowNullValue && mReadOnlySelector );

  if ( relation.isValid() )
  {
    mInvalidLabel->hide();

    mRelation = relation;
    mReferencingLayer = relation.referencingLayer();
    mRelationName = relation.name();
    mReferencedLayer = relation.referencedLayer();
    mFkeyFieldIdx = mReferencedLayer->fieldNameIndex( relation.fieldPairs().first().second );

    QgsAttributeEditorContext context( mEditorContext, relation, QgsAttributeEditorContext::Single, QgsAttributeEditorContext::Embed );

    if ( mEmbedForm )
    {
      mAttributeEditorFrame->setTitle( mReferencedLayer->name() );
      mReferencedAttributeForm = new QgsAttributeForm( relation.referencedLayer(), QgsFeature(), context, this );
      mReferencedAttributeForm->hideButtonBox();
      mAttributeEditorLayout->addWidget( mReferencedAttributeForm );
    }
  }
  else
  {
    mInvalidLabel->show();
  }

  if ( mShown && isVisible() )
  {
    init();
  }
}
Exemplo n.º 13
0
void QgsRelationReferenceWidget::setRelation( const QgsRelation &relation, bool allowNullValue )
{
  mAllowNull = allowNullValue;
  mRemoveFKButton->setVisible( allowNullValue && mReadOnlySelector );

  if ( relation.isValid() )
  {
    mInvalidLabel->hide();

    mRelation = relation;
    mReferencingLayer = relation.referencingLayer();
    mRelationName = relation.name();
    mReferencedLayer = relation.referencedLayer();
    mReferencedField = relation.fieldPairs().at( 0 ).second;
    if ( mComboBox )
      mComboBox->setIdentifierField( mReferencedField );

    mReferencedFieldIdx = mReferencedLayer->fields().lookupField( relation.fieldPairs().at( 0 ).second );
    mReferencingFieldIdx = mReferencingLayer->fields().lookupField( relation.fieldPairs().at( 0 ).first );
    mAttributeEditorFrame->setObjectName( QStringLiteral( "referencing/" ) + relation.name() );


    if ( mEmbedForm )
    {
      QgsAttributeEditorContext context( mEditorContext, relation, QgsAttributeEditorContext::Single, QgsAttributeEditorContext::Embed );
      mAttributeEditorFrame->setTitle( mReferencedLayer->name() );
      mReferencedAttributeForm = new QgsAttributeForm( relation.referencedLayer(), QgsFeature(), context, this );
      mAttributeEditorLayout->addWidget( mReferencedAttributeForm );
    }

    connect( mReferencedLayer, &QgsVectorLayer::editingStarted, this, &QgsRelationReferenceWidget::updateAddEntryButton );
    connect( mReferencedLayer, &QgsVectorLayer::editingStopped, this, &QgsRelationReferenceWidget::updateAddEntryButton );
    updateAddEntryButton();
  }
  else
  {
    mInvalidLabel->show();
  }

  if ( mShown && isVisible() )
  {
    init();
  }
}
void QgsRelationEditorWidget::setRelations( const QgsRelation &relation, const QgsRelation &nmrelation )
{
  if ( mRelation.isValid() )
  {
    disconnect( mRelation.referencingLayer(), &QgsVectorLayer::editingStarted, this, &QgsRelationEditorWidget::updateButtons );
    disconnect( mRelation.referencingLayer(), &QgsVectorLayer::editingStopped, this, &QgsRelationEditorWidget::updateButtons );
  }

  if ( mNmRelation.isValid() )
  {
    disconnect( mNmRelation.referencedLayer(), &QgsVectorLayer::editingStarted, this, &QgsRelationEditorWidget::updateButtons );
    disconnect( mNmRelation.referencedLayer(), &QgsVectorLayer::editingStopped, this, &QgsRelationEditorWidget::updateButtons );
  }

  mRelation = relation;
  mNmRelation = nmrelation;

  if ( !mRelation.isValid() )
    return;

  mToggleEditingButton->setVisible( true );

  const auto transactionGroups = QgsProject::instance()->transactionGroups();
  for ( auto it = transactionGroups.constBegin(); it != transactionGroups.constEnd(); ++it )
  {
    if ( it.value()->layers().contains( mRelation.referencingLayer() ) )
    {
      mToggleEditingButton->setVisible( false );
      mSaveEditsButton->setVisible( false );
    }
  }

  connect( mRelation.referencingLayer(), &QgsVectorLayer::editingStarted, this, &QgsRelationEditorWidget::updateButtons );
  connect( mRelation.referencingLayer(), &QgsVectorLayer::editingStopped, this, &QgsRelationEditorWidget::updateButtons );

  if ( mNmRelation.isValid() )
  {
    connect( mNmRelation.referencedLayer(), &QgsVectorLayer::editingStarted, this, &QgsRelationEditorWidget::updateButtons );
    connect( mNmRelation.referencedLayer(), &QgsVectorLayer::editingStopped, this, &QgsRelationEditorWidget::updateButtons );
  }

  setTitle( relation.name() );

  QgsVectorLayer *lyr = relation.referencingLayer();

  bool canChangeAttributes = lyr->dataProvider()->capabilities() & QgsVectorDataProvider::ChangeAttributeValues;
  if ( canChangeAttributes && !lyr->readOnly() )
  {
    mToggleEditingButton->setEnabled( true );
    updateButtons();
  }
  else
  {
    mToggleEditingButton->setEnabled( false );
  }

  if ( mNmRelation.isValid() )
    mZoomToFeatureButton->setVisible( mNmRelation.referencedLayer()->isSpatial() );
  else
    mZoomToFeatureButton->setVisible( mRelation.referencingLayer()->isSpatial() );

  setObjectName( QStringLiteral( "referenced/" ) + mRelation.name() );

  updateUi();
}
Exemplo n.º 15
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QgsRelation QgsRelation::createFromXml( const QDomNode &node )
{
  QDomElement elem = node.toElement();

  if ( elem.tagName() != "relation" )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Cannot create relation. Unexpected tag '%1'" ).arg( elem.tagName() ) );
  }

  QgsRelation relation;

  QString referencingLayerId = elem.attribute( "referencingLayer" );
  QString referencedLayerId = elem.attribute( "referencedLayer" );
  QString id = elem.attribute( "id" );
  QString name = elem.attribute( "name" );

  const QMap<QString, QgsMapLayer*>& mapLayers = QgsMapLayerRegistry::instance()->mapLayers();

  QgsMapLayer* referencingLayer = mapLayers[referencingLayerId];
  QgsMapLayer* referencedLayer = mapLayers[referencedLayerId];

  if ( !referencingLayer )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which does not exist." ).arg( referencingLayerId ) );
  }
  else if ( QgsMapLayer::VectorLayer  != referencingLayer->type() )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which is not of type VectorLayer." ).arg( referencingLayerId ) );
  }

  if ( !referencedLayer )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which does not exist." ).arg( referencedLayerId ) );
  }
  else if ( QgsMapLayer::VectorLayer  != referencedLayer->type() )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which is not of type VectorLayer." ).arg( referencedLayerId ) );
  }

  relation.mReferencingLayerId = referencingLayerId;
  relation.mReferencingLayer = qobject_cast<QgsVectorLayer*>( referencingLayer );
  relation.mReferencedLayerId = referencedLayerId;
  relation.mReferencedLayer = qobject_cast<QgsVectorLayer*>( referencedLayer );
  relation.mRelationId = id;
  relation.mRelationName = name;

  QDomNodeList references = elem.elementsByTagName( "fieldRef" );
  for ( int i = 0; i < references.size(); ++i )
  {
    QDomElement refEl = references.at( i ).toElement();

    QString referencingField = refEl.attribute( "referencingField" );
    QString referencedField = refEl.attribute( "referencedField" );

    relation.addFieldPair( referencingField, referencedField );
  }

  relation.updateRelationStatus();

  return relation;
}
Exemplo n.º 16
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QgsRelation QgsRelation::createFromXml( const QDomNode &node, QgsReadWriteContext &context )
{
  QDomElement elem = node.toElement();

  if ( elem.tagName() != QLatin1String( "relation" ) )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Cannot create relation. Unexpected tag '%1'" ).arg( elem.tagName() ) );
  }

  QgsRelation relation;

  QString referencingLayerId = elem.attribute( QStringLiteral( "referencingLayer" ) );
  QString referencedLayerId = elem.attribute( QStringLiteral( "referencedLayer" ) );
  QString id = elem.attribute( QStringLiteral( "id" ) );
  QString name = context.projectTranslator()->translate( QStringLiteral( "project:relations" ), elem.attribute( QStringLiteral( "name" ) ) );
  QString strength = elem.attribute( QStringLiteral( "strength" ) );

  const QMap<QString, QgsMapLayer *> &mapLayers = QgsProject::instance()->mapLayers();

  QgsMapLayer *referencingLayer = mapLayers[referencingLayerId];
  QgsMapLayer *referencedLayer = mapLayers[referencedLayerId];

  if ( !referencingLayer )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which does not exist." ).arg( referencingLayerId ) );
  }
  else if ( QgsMapLayer::VectorLayer  != referencingLayer->type() )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which is not of type VectorLayer." ).arg( referencingLayerId ) );
  }

  if ( !referencedLayer )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which does not exist." ).arg( referencedLayerId ) );
  }
  else if ( QgsMapLayer::VectorLayer  != referencedLayer->type() )
  {
    QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which is not of type VectorLayer." ).arg( referencedLayerId ) );
  }

  relation.d->mReferencingLayerId = referencingLayerId;
  relation.d->mReferencingLayer = qobject_cast<QgsVectorLayer *>( referencingLayer );
  relation.d->mReferencedLayerId = referencedLayerId;
  relation.d->mReferencedLayer = qobject_cast<QgsVectorLayer *>( referencedLayer );
  relation.d->mRelationId = id;
  relation.d->mRelationName = name;
  if ( strength == QLatin1String( "Composition" ) )
  {
    relation.d->mRelationStrength = RelationStrength::Composition;
  }
  else
  {
    relation.d->mRelationStrength = RelationStrength::Association;
  }

  QDomNodeList references = elem.elementsByTagName( QStringLiteral( "fieldRef" ) );
  for ( int i = 0; i < references.size(); ++i )
  {
    QDomElement refEl = references.at( i ).toElement();

    QString referencingField = refEl.attribute( QStringLiteral( "referencingField" ) );
    QString referencedField = refEl.attribute( QStringLiteral( "referencedField" ) );

    relation.addFieldPair( referencingField, referencedField );
  }

  relation.updateRelationStatus();

  return relation;
}
Exemplo n.º 17
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bool QgsComposerAttributeTableV2::getTableContents( QgsComposerTableContents &contents )
{
  contents.clear();

  if (( mSource == QgsComposerAttributeTableV2::AtlasFeature || mSource == QgsComposerAttributeTableV2::RelationChildren )
      && !mComposition->atlasComposition().enabled() )
  {
    //source mode requires atlas, but atlas disabled
    return false;
  }

  QgsVectorLayer* layer = sourceLayer();

  if ( !layer )
  {
    //no source layer
    return false;
  }

  //prepare filter expression
  std::auto_ptr<QgsExpression> filterExpression;
  bool activeFilter = false;
  if ( mFilterFeatures && !mFeatureFilter.isEmpty() )
  {
    filterExpression = std::auto_ptr<QgsExpression>( new QgsExpression( mFeatureFilter ) );
    if ( !filterExpression->hasParserError() )
    {
      activeFilter = true;
    }
  }

  QgsRectangle selectionRect;
  if ( mComposerMap && mShowOnlyVisibleFeatures )
  {
    selectionRect = *mComposerMap->currentMapExtent();
    if ( layer && mComposition->mapSettings().hasCrsTransformEnabled() )
    {
      //transform back to layer CRS
      QgsCoordinateTransform coordTransform( layer->crs(), mComposition->mapSettings().destinationCrs() );
      try
      {
        selectionRect = coordTransform.transformBoundingBox( selectionRect, QgsCoordinateTransform::ReverseTransform );
      }
      catch ( QgsCsException &cse )
      {
        Q_UNUSED( cse );
        return false;
      }
    }
  }

  QgsFeatureRequest req;

  if ( mSource == QgsComposerAttributeTableV2::RelationChildren )
  {
    QgsRelation relation = QgsProject::instance()->relationManager()->relation( mRelationId );
    QgsFeature* atlasFeature = mComposition->atlasComposition().currentFeature();
    if ( atlasFeature )
    {
      req = relation.getRelatedFeaturesRequest( *atlasFeature );
    }
    else
    {
      //no atlas feature, so empty table
      return true;
    }
  }

  if ( !selectionRect.isEmpty() )
    req.setFilterRect( selectionRect );

  req.setFlags( mShowOnlyVisibleFeatures ? QgsFeatureRequest::ExactIntersect : QgsFeatureRequest::NoFlags );

  if ( mSource == QgsComposerAttributeTableV2::AtlasFeature
       && mComposition->atlasComposition().enabled() )
  {
    //source mode is current atlas feature
    QgsFeature* atlasFeature = mComposition->atlasComposition().currentFeature();
    if ( atlasFeature )
    {
      req.setFilterFid( atlasFeature->id() );
    }
    else
    {
      //no atlas feature, so empty table
      return true;
    }
  }

  QgsFeature f;
  int counter = 0;
  QgsFeatureIterator fit = layer->getFeatures( req );

  while ( fit.nextFeature( f ) && counter < mMaximumNumberOfFeatures )
  {
    //check feature against filter
    if ( activeFilter )
    {
      QVariant result = filterExpression->evaluate( &f, layer->pendingFields() );
      // skip this feature if the filter evaluation is false
      if ( !result.toBool() )
      {
        continue;
      }
    }
    //check against atlas feature intersection
    if ( mFilterToAtlasIntersection )
    {
      if ( !f.geometry() || ! mComposition->atlasComposition().enabled() )
      {
        continue;
      }
      QgsFeature* atlasFeature = mComposition->atlasComposition().currentFeature();
      if ( !atlasFeature || !atlasFeature->geometry() ||
           !f.geometry()->intersects( atlasFeature->geometry() ) )
      {
        //feature falls outside current atlas feature
        continue;
      }
    }

    QgsComposerTableRow currentRow;

    QList<QgsComposerTableColumn*>::const_iterator columnIt = mColumns.constBegin();
    for ( ; columnIt != mColumns.constEnd(); ++columnIt )
    {
      int idx = layer->fieldNameIndex(( *columnIt )->attribute() );
      if ( idx != -1 )
      {
        currentRow << f.attributes()[idx];
      }
      else
      {
        // Lets assume it's an expression
        QgsExpression* expression = new QgsExpression(( *columnIt )->attribute() );
        expression->setCurrentRowNumber( counter + 1 );
        expression->prepare( layer->pendingFields() );
        QVariant value = expression->evaluate( f ) ;
        currentRow << value;
      }
    }

    if ( !mShowUniqueRowsOnly || !contentsContainsRow( contents, currentRow ) )
    {
      contents << currentRow;
      ++counter;
    }
  }

  //sort the list, starting with the last attribute
  QgsComposerAttributeTableCompareV2 c;
  QList< QPair<int, bool> > sortColumns = sortAttributes();
  for ( int i = sortColumns.size() - 1; i >= 0; --i )
  {
    c.setSortColumn( sortColumns.at( i ).first );
    c.setAscending( sortColumns.at( i ).second );
    qStableSort( contents.begin(), contents.end(), c );
  }

  recalculateTableSize();
  return true;
}