Implement export action

python/core/qgsauxiliarystorage.sip

@@ -92,6 +92,15 @@ class QgsAuxiliaryLayer : QgsVectorLayer
 
 
 
+    QgsVectorLayer *toSpatialLayer() const;
+%Docstring
+ An auxiliary layer is not spatial. This method returns a spatial
+ representation of auxiliary data.
+
+ :return: A new spatial vector layer
+ :rtype: QgsVectorLayer
+%End
+
     bool clear();
 %Docstring
  Deletes all features from the layer. Changes are automatically committed

src/app/qgisapp.cpp

@@ -1856,7 +1856,7 @@ void QgisApp::createActions()
   connect( mActionRollbackAllEdits, &QAction::triggered, this, &QgisApp::rollbackAllEdits );
   connect( mActionCancelEdits, &QAction::triggered, this, [ = ] { cancelEdits(); } );
   connect( mActionCancelAllEdits, &QAction::triggered, this, &QgisApp::cancelAllEdits );
-  connect( mActionLayerSaveAs, &QAction::triggered, this, &QgisApp::saveAsFile );
+  connect( mActionLayerSaveAs, &QAction::triggered, this, [ = ] { saveAsFile(); } );
   connect( mActionSaveLayerDefinition, &QAction::triggered, this, &QgisApp::saveAsLayerDefinition );
   connect( mActionRemoveLayer, &QAction::triggered, this, &QgisApp::removeLayer );
   connect( mActionDuplicateLayer, &QAction::triggered, this, [ = ] { duplicateLayers(); } );
@@ -6442,9 +6442,11 @@ void QgisApp::attributeTable()
   // the dialog will be deleted by itself on close
 }
 
-void QgisApp::saveAsRasterFile()
+void QgisApp::saveAsRasterFile( QgsRasterLayer *rasterLayer )
 {
-  QgsRasterLayer *rasterLayer = qobject_cast<QgsRasterLayer *>( activeLayer() );
+  if ( !rasterLayer )
+    rasterLayer = qobject_cast<QgsRasterLayer *>( activeLayer() );
+
   if ( !rasterLayer )
   {
     return;
@@ -6578,20 +6580,22 @@ void QgisApp::saveAsRasterFile()
 }
 
 
-void QgisApp::saveAsFile()
+void QgisApp::saveAsFile( QgsMapLayer *layer )
 {
-  QgsMapLayer *layer = activeLayer();
+  if ( !layer )
+    layer = activeLayer();
+
   if ( !layer )
     return;
 
   QgsMapLayer::LayerType layerType = layer->type();
   if ( layerType == QgsMapLayer::RasterLayer )
   {
-    saveAsRasterFile();
+    saveAsRasterFile( qobject_cast<QgsRasterLayer *>( layer ) );
   }
   else if ( layerType == QgsMapLayer::VectorLayer )
   {
-    saveAsVectorFileGeneral();
+    saveAsVectorFileGeneral( qobject_cast<QgsVectorLayer *>( layer ) );
   }
 }
 

src/app/qgisapp.h

@@ -654,6 +654,9 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
     QSize iconSize( bool dockedToolbar = false ) const;
 
   public slots:
+    //! save current vector layer
+    void saveAsFile( QgsMapLayer *layer = nullptr );
+
     //! Process the list of URIs that have been dropped in QGIS
     void handleDropUriList( const QgsMimeDataUtils::UriList &lst );
     //! Convenience function to open either a project or a layer file.
@@ -1439,13 +1442,10 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
     //! set the CAD dock widget visible
     void setCadDockVisible( bool visible );
 
-    //! save current vector layer
-    void saveAsFile();
-
     void saveAsLayerDefinition();
 
     //! save current raster layer
-    void saveAsRasterFile();
+    void saveAsRasterFile( QgsRasterLayer *layer = nullptr );
 
     //! show Python console
     void showPythonDialog();

src/app/qgsvectorlayerproperties.cpp

@@ -86,6 +86,7 @@ QgsVectorLayerProperties::QgsVectorLayerProperties(
   , mAuxiliaryLayerActionNew( nullptr )
   , mAuxiliaryLayerActionClear( nullptr )
   , mAuxiliaryLayerActionDelete( nullptr )
+  , mAuxiliaryLayerActionExport( nullptr )
 {
   setupUi( this );
   connect( mLayerOrigNameLineEdit, &QLineEdit::textEdited, this, &QgsVectorLayerProperties::mLayerOrigNameLineEdit_textEdited );
@@ -371,6 +372,10 @@ QgsVectorLayerProperties::QgsVectorLayerProperties(
   menu->addAction( mAuxiliaryLayerActionDelete );
   connect( mAuxiliaryLayerActionDelete, &QAction::triggered, this, &QgsVectorLayerProperties::onAuxiliaryLayerDelete );
 
+  mAuxiliaryLayerActionExport = new QAction( tr( "Export" ), this );
+  menu->addAction( mAuxiliaryLayerActionExport );
+  connect( mAuxiliaryLayerActionExport, &QAction::triggered, this, &QgsVectorLayerProperties::onAuxiliaryLayerExport );
+
   mAuxiliaryStorageActions->setMenu( menu );
 
   updateAuxiliaryStoragePage();
@@ -1504,6 +1509,7 @@ void QgsVectorLayerProperties::updateAuxiliaryStoragePage( bool reset )
     // update actions
     mAuxiliaryLayerActionClear->setEnabled( true );
     mAuxiliaryLayerActionDelete->setEnabled( true );
+    mAuxiliaryLayerActionExport->setEnabled( true );
     mAuxiliaryLayerActionNew->setEnabled( false );
 
     const QgsAuxiliaryLayer *alayer = mLayer->auxiliaryLayer();
@@ -1540,6 +1546,7 @@ void QgsVectorLayerProperties::updateAuxiliaryStoragePage( bool reset )
 
     mAuxiliaryLayerActionClear->setEnabled( false );
     mAuxiliaryLayerActionDelete->setEnabled( false );
+    mAuxiliaryLayerActionExport->setEnabled( false );
 
     if ( mLayer->isSpatial() )
       mAuxiliaryLayerActionNew->setEnabled( true );
@@ -1612,3 +1619,15 @@ void QgsVectorLayerProperties::onAuxiliaryLayerDelete()
     mLayer->triggerRepaint();
   }
 }
+
+void QgsVectorLayerProperties::onAuxiliaryLayerExport()
+{
+  const QgsAuxiliaryLayer *alayer = mLayer->auxiliaryLayer();
+  if ( !alayer )
+    return;
+
+  std::unique_ptr<QgsVectorLayer> clone;
+  clone.reset( alayer->toSpatialLayer() );
+
+  QgisApp::instance()->saveAsFile( clone.get() );
+}

src/app/qgsvectorlayerproperties.h

@@ -162,6 +162,8 @@ class APP_EXPORT QgsVectorLayerProperties : public QgsOptionsDialogBase, private
 
     void onAuxiliaryLayerDelete();
 
+    void onAuxiliaryLayerExport();
+
   private:
 
     void saveStyleAs( StyleType styleType );
@@ -228,6 +230,7 @@ class APP_EXPORT QgsVectorLayerProperties : public QgsOptionsDialogBase, private
     QAction *mAuxiliaryLayerActionNew;
     QAction *mAuxiliaryLayerActionClear;
     QAction *mAuxiliaryLayerActionDelete;
+    QAction *mAuxiliaryLayerActionExport;
 
   private slots:
     void openPanel( QgsPanelWidget *panel );

src/core/qgsauxiliarystorage.cpp

@@ -21,6 +21,7 @@
 #include "qgsproject.h"
 #include "qgspallabeling.h"
 #include "qgsdiagramrenderer.h"
+#include "qgsmemoryproviderutils.h"
 
 #include <QFile>
 
@@ -169,6 +170,37 @@ QgsAuxiliaryLayer::QgsAuxiliaryLayer( const QString &pkField, const QString &fil
   mJoinInfo.setCascadedDelete( true );
 }
 
+QgsVectorLayer *QgsAuxiliaryLayer::toSpatialLayer() const
+{
+  QgsVectorLayer *layer = QgsMemoryProviderUtils::createMemoryLayer( QStringLiteral( "auxiliary_layer" ), fields(), mLayer->wkbType(), mLayer->crs() );
+
+  QString pkField = mJoinInfo.targetFieldName();
+  QgsFeature joinFeature;
+  QgsFeature targetFeature;
+  QgsFeatureIterator it = getFeatures();
+
+  layer->startEditing();
+  while ( it.nextFeature( joinFeature ) )
+  {
+    QString filter = QgsExpression::createFieldEqualityExpression( pkField, joinFeature.attribute( AS_JOINFIELD ) );
+
+    QgsFeatureRequest request;
+    request.setFilterExpression( filter );
+
+    mLayer->getFeatures( request ).nextFeature( targetFeature );
+
+    if ( targetFeature.isValid() )
+    {
+      QgsFeature newFeature( joinFeature );
+      newFeature.setGeometry( targetFeature.geometry() );
+      layer->addFeature( newFeature );
+    }
+  }
+  layer->commitChanges();
+
+  return layer;
+}
+
 QgsVectorLayerJoinInfo QgsAuxiliaryLayer::joinInfo() const
 {
   return mJoinInfo;

src/core/qgsauxiliarystorage.h

@@ -122,6 +122,14 @@ class CORE_EXPORT QgsAuxiliaryLayer : public QgsVectorLayer
 
     QgsAuxiliaryLayer &operator=( QgsAuxiliaryLayer const &rhs ) = delete;
 
+    /**
+     * An auxiliary layer is not spatial. This method returns a spatial
+     * representation of auxiliary data.
+     *
+     * \returns A new spatial vector layer
+     */
+    QgsVectorLayer *toSpatialLayer() const;
+
     /**
      * Deletes all features from the layer. Changes are automatically committed
      * and the layer remains editable.