Only enable edit datum transform button when a transform is selected

Sponsored by ICSM

src/app/qgsdatumtransformtablewidget.cpp

@@ -188,6 +188,9 @@ QgsDatumTransformTableWidget::QgsDatumTransformTableWidget( QWidget *parent )
   connect( mAddButton, &QToolButton::clicked, this, &QgsDatumTransformTableWidget::addDatumTransform );
   connect( mRemoveButton, &QToolButton::clicked, this, &QgsDatumTransformTableWidget::removeDatumTransform );
   connect( mEditButton, &QToolButton::clicked, this, &QgsDatumTransformTableWidget::editDatumTransform );
+
+  connect( mTableView->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsDatumTransformTableWidget::selectionChanged );
+  mEditButton->setEnabled( false );
 }
 
 void QgsDatumTransformTableWidget::addDatumTransform()
@@ -199,6 +202,7 @@ void QgsDatumTransformTableWidget::addDatumTransform()
     QgsCoordinateTransformContext context = mModel->transformContext();
     context.addSourceDestinationDatumTransform( dt.first.first, dt.second.first, dt.first.second, dt.second.second );
     mModel->setTransformContext( context );
+    selectionChanged();
   }
 }
 
@@ -208,6 +212,7 @@ void QgsDatumTransformTableWidget::removeDatumTransform()
   if ( selectedIndexes.count() > 0 )
   {
     mModel->removeTransform( selectedIndexes );
+    selectionChanged();
   }
 }
 
@@ -255,3 +260,8 @@ void QgsDatumTransformTableWidget::editDatumTransform()
     }
   }
 }
+
+void QgsDatumTransformTableWidget::selectionChanged( const QItemSelection &, const QItemSelection & )
+{
+  mEditButton->setEnabled( !mTableView->selectionModel()->selection().empty() );
+}

src/app/qgsdatumtransformtablewidget.h

@@ -44,7 +44,6 @@ class APP_EXPORT QgsDatumTransformTableModel : public QAbstractTableModel
     };
 
     QgsDatumTransformTableModel( QObject *parent = nullptr );
-    ~QgsDatumTransformTableModel() {}
 
     void setTransformContext( const QgsCoordinateTransformContext &context );
 
@@ -96,6 +95,10 @@ class APP_EXPORT QgsDatumTransformTableWidget : public QWidget, private Ui::QgsD
     //! edit currently selected datum transform
     void editDatumTransform();
 
+  private slots:
+
+    void selectionChanged( const QItemSelection &selected = QItemSelection(), const QItemSelection &deselected = QItemSelection() );
+
   private:
     QgsDatumTransformTableModel *mModel = nullptr;
 };