C++ QgsVectorLayer::allFeatureIds方法代码示例

void QgsGeometrySnapperDialog::run()
{
  /** Get layers **/
  QgsVectorLayer* layer = getInputLayer();
  QgsVectorLayer* referenceLayer = getReferenceLayer();
  if ( layer == 0 || referenceLayer == 0 )
  {
    return;
  }

  if ( ui.radioButtonOutputNew->isChecked() &&
       ( layer->dataProvider()->dataSourceUri().startsWith( ui.lineEditOutput->text() ) ||
         referenceLayer->dataProvider()->dataSourceUri().startsWith( ui.lineEditOutput->text() ) ) )
  {
    QMessageBox::critical( this, tr( "Invalid Output Layer" ), tr( "The chosen output layer is the same as an input layer." ) );
    return;
  }

  bool selectedOnly = ui.checkBoxInputSelectedOnly->isChecked();

  /** Duplicate if necessary **/
  if ( ui.radioButtonOutputNew->isChecked() )
  {
    QString filename = ui.lineEditOutput->text();

    // Remove existing layer with same uri
    QStringList toRemove;
    foreach ( QgsMapLayer* maplayer, QgsMapLayerRegistry::instance()->mapLayers() )
    {
      if ( dynamic_cast<QgsVectorLayer*>( maplayer ) &&
           static_cast<QgsVectorLayer*>( maplayer )->dataProvider()->dataSourceUri().startsWith( filename ) )
      {
        toRemove.append( maplayer->id() );
      }
    }
    if ( !toRemove.isEmpty() )
    {
      QgsMapLayerRegistry::instance()->removeMapLayers( toRemove );
    }

    QString errMsg;
    QgsVectorFileWriter::WriterError err =  QgsVectorFileWriter::writeAsVectorFormat( layer, filename, layer->dataProvider()->encoding(), &layer->crs(), mOutputDriverName, selectedOnly, &errMsg );
    if ( err != QgsVectorFileWriter::NoError )
    {
      QMessageBox::critical( this, tr( "Layer Creation Failed" ), tr( "Failed to create the output layer: %1" ).arg( errMsg ) );
      return;
    }
    QgsVectorLayer* newlayer = new QgsVectorLayer( filename, QFileInfo( filename ).completeBaseName(), "ogr" );

    if ( selectedOnly )
    {
      QgsFeature feature;

      // Get features to select (only selected features were written up to this point)
      QgsFeatureIds selectedFeatures = newlayer->allFeatureIds();

      // Write non-selected feature ids
      QgsFeatureList features;
      QgsFeatureIterator it = layer->getFeatures();
      while ( it.nextFeature( feature ) )
      {
        if ( !layer->selectedFeaturesIds().contains( feature.id() ) )
        {
          features.append( feature );
        }
      }
      newlayer->dataProvider()->addFeatures( features );

      // Set selected features
      newlayer->setSelectedFeatures( selectedFeatures );
    }
    layer = newlayer;
  }

void QgsGeometryCheckerSetupTab::runChecks()
{
  // Get selected layer
  QList<QgsVectorLayer *> layers = getSelectedLayers();
  if ( layers.isEmpty() )
    return;

  if ( ui.radioButtonOutputNew->isChecked() )
  {
    for ( QgsVectorLayer *layer : layers )
    {
      if ( layer->dataProvider()->dataSourceUri().startsWith( ui.lineEditOutputDirectory->text() ) )
      {
        QMessageBox::critical( this, tr( "Invalid Output Directory" ), tr( "The chosen output directory contains one or more input layers." ) );
        return;
      }
    }
  }
  QgsVectorLayer *lineLayerCheckLayer = ui.comboLineLayerIntersection->isEnabled() ? dynamic_cast<QgsVectorLayer *>( QgsProject::instance()->mapLayer( ui.comboLineLayerIntersection->currentData().toString() ) ) : nullptr;
  QgsVectorLayer *followBoundaryCheckLayer = ui.comboBoxFollowBoundaries->isEnabled() ? dynamic_cast<QgsVectorLayer *>( QgsProject::instance()->mapLayer( ui.comboBoxFollowBoundaries->currentData().toString() ) ) : nullptr;
  if ( layers.contains( lineLayerCheckLayer ) || layers.contains( followBoundaryCheckLayer ) )
  {
    QMessageBox::critical( this, tr( "Error" ), tr( "The test layer set contains a layer selected for a topology check." ) );
    return;
  }

  for ( QgsVectorLayer *layer : layers )
  {
    if ( layer->isEditable() )
    {
      QMessageBox::critical( this, tr( "Editable Input Layer" ), tr( "Input layer are not allowed to be in editing mode." ) );
      return;
    }
  }
  bool selectedOnly = ui.checkBoxInputSelectedOnly->isChecked();

  // Set window busy
  setCursor( Qt::WaitCursor );
  mRunButton->setEnabled( false );
  ui.labelStatus->setText( tr( "<b>Preparing output...</b>" ) );
  ui.labelStatus->show();
  QApplication::processEvents( QEventLoop::ExcludeUserInputEvents );

  QList<QgsVectorLayer *> processLayers;
  if ( ui.radioButtonOutputNew->isChecked() )
  {
    // Get output directory and file extension
    QDir outputDir = QDir( ui.lineEditOutputDirectory->text() );
    QString outputDriverName = ui.comboBoxOutputFormat->currentText();
    QgsVectorFileWriter::MetaData metadata;
    if ( !QgsVectorFileWriter::driverMetadata( outputDriverName, metadata ) )
    {
      QMessageBox::critical( this, tr( "Unknown Output Format" ), tr( "The specified output format cannot be recognized." ) );
      mRunButton->setEnabled( true );
      ui.labelStatus->hide();
      unsetCursor();
      return;
    }
    QString outputExtension = metadata.ext;

    // List over input layers, check which existing project layers need to be removed and create output layers
    QString filenamePrefix = ui.lineEditFilenamePrefix->text();
    QSettings().setValue( "/geometry_checker/previous_values/filename_prefix", filenamePrefix );
    QStringList toRemove;
    QStringList createErrors;
    for ( QgsVectorLayer *layer : layers )
    {
      QString outputPath = outputDir.absoluteFilePath( filenamePrefix + layer->name() + "." + outputExtension );

      // Remove existing layer with same uri from project
      for ( QgsVectorLayer *projectLayer : QgsProject::instance()->layers<QgsVectorLayer *>() )
      {
        if ( projectLayer->dataProvider()->dataSourceUri().startsWith( outputPath ) )
        {
          toRemove.append( projectLayer->id() );
        }
      }

      // Create output layer
      QString errMsg;
      QgsVectorFileWriter::WriterError err =  QgsVectorFileWriter::writeAsVectorFormat( layer, outputPath, layer->dataProvider()->encoding(), layer->crs(), outputDriverName, selectedOnly, &errMsg );
      if ( err != QgsVectorFileWriter::NoError )
      {
        createErrors.append( errMsg );
        continue;
      }

      QgsVectorLayer *newlayer = new QgsVectorLayer( outputPath, QFileInfo( outputPath ).completeBaseName(), QStringLiteral( "ogr" ) );
      if ( selectedOnly )
      {
        QgsFeature feature;

        // Get features to select (only selected features were written up to this point)
        QgsFeatureIds selectedFeatures = newlayer->allFeatureIds();

        // Write non-selected feature ids
        QgsFeatureList features;
        QgsFeatureIterator it = layer->getFeatures();
        while ( it.nextFeature( feature ) )
        {
//.........这里部分代码省略.........

void QgsMapToolReshape::cadCanvasReleaseEvent( QgsMapMouseEvent * e )
{
  //check if we operate on a vector layer //todo: move this to a function in parent class to avoid duplication
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mCanvas->currentLayer() );

  if ( !vlayer )
  {
    notifyNotVectorLayer();
    return;
  }

  if ( !vlayer->isEditable() )
  {
    notifyNotEditableLayer();
    return;
  }

  //add point to list and to rubber band
  if ( e->button() == Qt::LeftButton )
  {
    int error = addVertex( e->mapPoint(), e->mapPointMatch() );
    if ( error == 1 )
    {
      //current layer is not a vector layer
      return;
    }
    else if ( error == 2 )
    {
      //problem with coordinate transformation
      emit messageEmitted( tr( "Cannot transform the point to the layers coordinate system" ), QgsMessageBar::WARNING );
      return;
    }

    startCapturing();
  }
  else if ( e->button() == Qt::RightButton )
  {
    deleteTempRubberBand();

    //find out bounding box of mCaptureList
    if ( size() < 1 )
    {
      stopCapturing();
      return;
    }
    QgsPoint firstPoint = points().at( 0 );
    QgsRectangle bbox( firstPoint.x(), firstPoint.y(), firstPoint.x(), firstPoint.y() );
    for ( int i = 1; i < size(); ++i )
    {
      bbox.combineExtentWith( points().at( i ).x(), points().at( i ).y() );
    }

    //query all the features that intersect bounding box of capture line
    QgsFeatureIterator fit = vlayer->getFeatures( QgsFeatureRequest().setFilterRect( bbox ).setSubsetOfAttributes( QgsAttributeList() ) );
    QgsFeature f;
    int reshapeReturn;
    bool reshapeDone = false;

    vlayer->beginEditCommand( tr( "Reshape" ) );
    while ( fit.nextFeature( f ) )
    {
      //query geometry
      //call geometry->reshape(mCaptureList)
      //register changed geometry in vector layer
      QgsGeometry* geom = f.geometry();
      if ( geom )
      {
        reshapeReturn = geom->reshapeGeometry( points() );
        if ( reshapeReturn == 0 )
        {
          //avoid intersections on polygon layers
          if ( vlayer->geometryType() == QGis::Polygon )
          {
            //ignore all current layer features as they should be reshaped too
            QMap<QgsVectorLayer*, QSet<QgsFeatureId> > ignoreFeatures;
            ignoreFeatures.insert( vlayer, vlayer->allFeatureIds() );

            if ( geom->avoidIntersections( ignoreFeatures ) != 0 )
            {
              emit messageEmitted( tr( "An error was reported during intersection removal" ), QgsMessageBar::CRITICAL );
              vlayer->destroyEditCommand();
              stopCapturing();
              return;
            }

            if ( geom->isGeosEmpty() ) //intersection removal might have removed the whole geometry
            {
              emit messageEmitted( tr( "The feature cannot be reshaped because the resulting geometry is empty" ), QgsMessageBar::CRITICAL );
              vlayer->destroyEditCommand();
              stopCapturing();
              return;
            }
          }

          vlayer->changeGeometry( f.id(), geom );
          reshapeDone = true;
        }
      }
    }

//.........这里部分代码省略.........