Implement delete action

python/core/qgsauxiliarystorage.sip

@@ -241,6 +241,14 @@ class QgsAuxiliaryStorage
  :rtype: QgsAuxiliaryLayer
 %End
 
+    static bool deleteTable( const QgsDataSourceUri &uri );
+%Docstring
+ Removes a table from the auxiliary storage.
+
+ :return: true if the table is well deleted, false otherwise
+ :rtype: bool
+%End
+
     static QString extension();
 %Docstring
  Returns the extension used for auxiliary databases.

src/app/qgsvectorlayerproperties.cpp

@@ -85,6 +85,7 @@ QgsVectorLayerProperties::QgsVectorLayerProperties(
   , mOriginalSubsetSQL( lyr->subsetString() )
   , mAuxiliaryLayerActionNew( nullptr )
   , mAuxiliaryLayerActionClear( nullptr )
+  , mAuxiliaryLayerActionDelete( nullptr )
 {
   setupUi( this );
   connect( mLayerOrigNameLineEdit, &QLineEdit::textEdited, this, &QgsVectorLayerProperties::mLayerOrigNameLineEdit_textEdited );
@@ -366,6 +367,10 @@ QgsVectorLayerProperties::QgsVectorLayerProperties(
   menu->addAction( mAuxiliaryLayerActionClear );
   connect( mAuxiliaryLayerActionClear, &QAction::triggered, this, &QgsVectorLayerProperties::onAuxiliaryLayerClear );
 
+  mAuxiliaryLayerActionDelete = new QAction( tr( "Delete" ), this );
+  menu->addAction( mAuxiliaryLayerActionDelete );
+  connect( mAuxiliaryLayerActionDelete, &QAction::triggered, this, &QgsVectorLayerProperties::onAuxiliaryLayerDelete );
+
   mAuxiliaryStorageActions->setMenu( menu );
 
   updateAuxiliaryStoragePage();
@@ -1497,6 +1502,8 @@ void QgsVectorLayerProperties::updateAuxiliaryStoragePage( bool reset )
     mAuxiliaryStorageFeaturesLineEdit->setText( QString::number( features ) );
 
     // update actions
+    mAuxiliaryLayerActionClear->setEnabled( true );
+    mAuxiliaryLayerActionDelete->setEnabled( true );
     mAuxiliaryLayerActionNew->setEnabled( false );
 
     const QgsAuxiliaryLayer *alayer = mLayer->auxiliaryLayer();
@@ -1531,6 +1538,9 @@ void QgsVectorLayerProperties::updateAuxiliaryStoragePage( bool reset )
     mAuxiliaryStorageInformationGrpBox->setEnabled( false );
     mAuxiliaryStorageFieldsGrpBox->setEnabled( false );
 
+    mAuxiliaryLayerActionClear->setEnabled( false );
+    mAuxiliaryLayerActionDelete->setEnabled( false );
+
     if ( mLayer->isSpatial() )
       mAuxiliaryLayerActionNew->setEnabled( true );
 
@@ -1580,3 +1590,25 @@ void QgsVectorLayerProperties::onAuxiliaryLayerClear()
     mLayer->triggerRepaint();
   }
 }
+
+void QgsVectorLayerProperties::onAuxiliaryLayerDelete()
+{
+  QgsAuxiliaryLayer *alayer = mLayer->auxiliaryLayer();
+  if ( !alayer )
+    return;
+
+  const QString msg = tr( "Are you sure you want to delete auxiliary storage for %1" ).arg( mLayer->name() );
+  QMessageBox::StandardButton reply;
+  reply = QMessageBox::question( this, "Delete auxiliary storage", msg, QMessageBox::Yes | QMessageBox::No );
+
+  if ( reply == QMessageBox::Yes )
+  {
+    QApplication::setOverrideCursor( Qt::WaitCursor );
+    QgsDataSourceUri uri( alayer->source() );
+    mLayer->setAuxiliaryLayer(); // remove auxiliary layer
+    QgsAuxiliaryStorage::deleteTable( uri );
+    QApplication::restoreOverrideCursor();
+    updateAuxiliaryStoragePage( true );
+    mLayer->triggerRepaint();
+  }
+}

src/app/qgsvectorlayerproperties.h

@@ -157,8 +157,11 @@ class APP_EXPORT QgsVectorLayerProperties : public QgsOptionsDialogBase, private
     void updateFieldsPropertiesDialog();
 
     void onAuxiliaryLayerNew();
+
     void onAuxiliaryLayerClear();
 
+    void onAuxiliaryLayerDelete();
+
   private:
 
     void saveStyleAs( StyleType styleType );
@@ -224,6 +227,7 @@ class APP_EXPORT QgsVectorLayerProperties : public QgsOptionsDialogBase, private
 
     QAction *mAuxiliaryLayerActionNew;
     QAction *mAuxiliaryLayerActionClear;
+    QAction *mAuxiliaryLayerActionDelete;
 
   private slots:
     void openPanel( QgsPanelWidget *panel );

src/core/qgsauxiliarystorage.cpp

@@ -311,6 +311,45 @@ QgsAuxiliaryLayer *QgsAuxiliaryStorage::createAuxiliaryLayer( const QgsField &fi
   return alayer;
 }
 
+bool QgsAuxiliaryStorage::deleteTable( const QgsDataSourceUri &uri )
+{
+  bool rc = false;
+
+  // parsing for ogr style uri :
+  // " filePath|layername='tableName' table="" sql="
+  QStringList uriParts = uri.uri().split( '|' );
+  if ( uriParts.count() < 2 )
+    return false;
+
+  const QString databasePath = uriParts[0].replace( ' ', "" );
+
+  const QString table = uriParts[1];
+  QStringList tableParts = table.split( ' ' );
+
+  if ( tableParts.count() < 1 )
+    return false;
+
+  const QString tableName = tableParts[0].replace( "layername=", "" );
+
+  if ( !databasePath.isEmpty() && !tableName.isEmpty() )
+  {
+    sqlite3 *handler = openDB( databasePath );
+
+    if ( handler )
+    {
+      QString sql = QString( "DROP TABLE %1" ).arg( tableName );
+      rc = exec( sql, handler );
+
+      sql = QString( "VACUUM" );
+      rc = exec( sql, handler );
+
+      close( handler );
+    }
+  }
+
+  return rc;
+}
+
 bool QgsAuxiliaryStorage::saveAs( const QString &filename ) const
 {
   if ( QFile::exists( filename ) )

src/core/qgsauxiliarystorage.h

@@ -259,6 +259,13 @@ class CORE_EXPORT QgsAuxiliaryStorage
      */
     QgsAuxiliaryLayer *createAuxiliaryLayer( const QgsField &field, const QgsVectorLayer *layer ) const;
 
+    /**
+     * Removes a table from the auxiliary storage.
+     *
+     * \returns true if the table is well deleted, false otherwise
+     */
+    static bool deleteTable( const QgsDataSourceUri &uri );
+
     /**
      * Returns the extension used for auxiliary databases.
      */