[attributetable] Adjust the edit selection when the filter changes

Make sure that we always have a feature on the form that matches the current filter condition

Author: m-kuhn

src/gui/attributetable/qgsdualview.cpp

@@ -48,7 +48,6 @@ QgsDualView::QgsDualView( QWidget *parent )
 
   mConditionalFormatWidget->hide();
 
-
   mPreviewColumnsMenu = new QMenu( this );
   mActionPreviewColumnsMenu->setMenu( mPreviewColumnsMenu );
 
@@ -84,7 +83,8 @@ void QgsDualView::init( QgsVectorLayer *layer, QgsMapCanvas *mapCanvas, const Qg
   mTableView->setModel( mFilterModel );
   mFeatureList->setModel( mFeatureListModel );
   delete mAttributeForm;
-  mAttributeForm = new QgsAttributeForm( mLayer, QgsFeature(), mEditorContext );
+  mAttributeForm = new QgsAttributeForm( mLayer, mTempAttributeFormFeature, mEditorContext );
+  mTempAttributeFormFeature = QgsFeature();
   if ( !context.parentContext() )
   {
     mAttributeEditorScrollArea = new QgsScrollArea();
@@ -410,7 +410,11 @@ void QgsDualView::mFeatureList_aboutToChangeEditSelection( bool &ok )
 
 void QgsDualView::mFeatureList_currentEditSelectionChanged( const QgsFeature &feat )
 {
-  if ( !mLayer->isEditable() || mAttributeForm->save() )
+  if ( !mAttributeForm )
+  {
+    mTempAttributeFormFeature = feat;
+  }
+  else if ( !mLayer->isEditable() || mAttributeForm->save() )
   {
     mAttributeForm->setFeature( feat );
     setCurrentEditSelection( QgsFeatureIds() << feat.id() );

src/gui/attributetable/qgsdualview.h

@@ -374,6 +374,9 @@ class GUI_EXPORT QgsDualView : public QStackedWidget, private Ui::QgsDualViewBas
     QgsAttributeTableConfig mConfig;
     QgsScrollArea *mAttributeEditorScrollArea = nullptr;
     QgsMapCanvas *mMapCanvas = nullptr;
+    // If the current feature is set, while the form is still not initialized
+    // we will temporarily save it in here and set it on init
+    QgsFeature mTempAttributeFormFeature;
 
     friend class TestQgsDualView;
     friend class TestQgsAttributeTable;

src/gui/attributetable/qgsfeaturelistmodel.cpp

@@ -45,6 +45,8 @@ void QgsFeatureListModel::setSourceModel( QgsAttributeTableFilterModel *sourceMo
     // propagate sort order changes from source model to views connected to this model
     connect( mFilterModel, &QAbstractItemModel::layoutAboutToBeChanged, this, &QAbstractItemModel::layoutAboutToBeChanged );
     connect( mFilterModel, &QAbstractItemModel::layoutChanged, this, &QAbstractItemModel::layoutChanged );
+    connect( mFilterModel, &QAbstractItemModel::modelAboutToBeReset, this, &QAbstractItemModel::modelAboutToBeReset );
+    connect( mFilterModel, &QAbstractItemModel::modelReset, this, &QAbstractItemModel::modelReset );
   }
 }
 

src/gui/attributetable/qgsfeaturelistview.cpp

@@ -76,6 +76,9 @@ void QgsFeatureListView::setModel( QgsFeatureListModel *featureListModel )
            this, static_cast<void ( QgsFeatureListView::* )()>( &QgsFeatureListView::repaintRequested ) );
   connect( mCurrentEditSelectionModel, &QItemSelectionModel::selectionChanged, this, &QgsFeatureListView::editSelectionChanged );
   connect( mModel->layerCache()->layer(), &QgsVectorLayer::attributeValueChanged, this, [ = ] { repaintRequested(); } );
+  connect( featureListModel, &QgsFeatureListModel::rowsRemoved, this, &QgsFeatureListView::ensureEditSelection );
+  connect( featureListModel, &QgsFeatureListModel::rowsInserted, this, &QgsFeatureListView::ensureEditSelection );
+  connect( featureListModel, &QgsFeatureListModel::modelReset, this, &QgsFeatureListView::ensureEditSelection );
 }
 
 bool QgsFeatureListView::setDisplayExpression( const QString &expression )
@@ -104,7 +107,8 @@ QString QgsFeatureListView::parserErrorString()
 QgsFeatureIds QgsFeatureListView::currentEditSelection()
 {
   QgsFeatureIds selection;
-  Q_FOREACH ( const QModelIndex &idx, mCurrentEditSelectionModel->selectedIndexes() )
+  const QModelIndexList selectedIndexes = mCurrentEditSelectionModel->selectedIndexes();
+  for ( const QModelIndex &idx : selectedIndexes )
   {
     selection << idx.data( QgsAttributeTableModel::FeatureIdRole ).value<QgsFeatureId>();
   }
@@ -328,6 +332,18 @@ void QgsFeatureListView::selectRow( const QModelIndex &index, bool anchor )
   mFeatureSelectionModel->selectFeatures( QItemSelection( tl, br ), command );
 }
 
+void QgsFeatureListView::ensureEditSelection()
+{
+  QModelIndexList selectedIndexes = mCurrentEditSelectionModel->selectedIndexes();
+  // If there is no selection or an invalid selection (and there would be something we could select) : select it
+  if ( ( selectedIndexes.isEmpty()
+         || mModel->mapFromMaster( selectedIndexes.first() ).row() == -1 )
+       && mModel->rowCount() )
+  {
+    mCurrentEditSelectionModel->select( mModel->mapToMaster( mModel->index( 0, 0 ) ), QItemSelectionModel::Select );
+  }
+}
+
 void QgsFeatureListView::setFeatureSelectionManager( QgsIFeatureSelectionManager *featureSelectionManager )
 {
   delete mFeatureSelectionManager;

src/gui/attributetable/qgsfeaturelistview.h

@@ -174,9 +174,15 @@ class GUI_EXPORT QgsFeatureListView : public QListView
   private slots:
     void editSelectionChanged( const QItemSelection &deselected, const QItemSelection &selected );
 
+    /**
+     * Make sure, there is an edit selection. If there is none, choose the first item.
+     */
+    void ensureEditSelection();
+
   private:
     void selectRow( const QModelIndex &index, bool anchor );
 
+
     QgsFeatureListModel *mModel = nullptr;
     QItemSelectionModel *mCurrentEditSelectionModel = nullptr;
     QgsFeatureSelectionModel *mFeatureSelectionModel = nullptr;