Also add newly created sensors to the selected virtual sensor

src/fr/uca/iut/clfreville2/gui/MainWindows.java

@@ -28,7 +28,9 @@ import javafx.beans.value.ChangeListener;
 import javafx.beans.value.ObservableValue;
 import javafx.collections.FXCollections;
 import javafx.fxml.FXML;
+import javafx.scene.control.Alert;
 import javafx.scene.control.Button;
+import javafx.scene.control.ButtonType;
 import javafx.scene.control.CheckBox;
 import javafx.scene.control.ChoiceBox;
 import javafx.scene.control.Slider;
@@ -139,7 +141,16 @@ public class MainWindows {
 
     @FXML
     public void onCreateClick() {
-        createType.getSelectionModel().getSelectedItem().create(registry, newName.getText());
+        if (createType.getSelectionModel().getSelectedItem() == null || newName.getText().isEmpty()) {
+            Alert alert = new Alert(Alert.AlertType.ERROR, "Empty form", ButtonType.CANCEL);
+            alert.showAndWait();
+            return;
+        }
+        Sensor sensor = createType.getSelectionModel().getSelectedItem().create(registry, newName.getText());
+        Sensor selected = getSelectedSensor();
+        if (selected instanceof VirtualSensor virtual) {
+            virtual.addSource(sensor, 1D);
+        }
     }
 
     @FXML
@@ -232,6 +243,7 @@ public class MainWindows {
                 new VirtualSensorFactory()
         );
         createType.setConverter(new NameableStringConverter<>(createType.getItems()));
+        createType.getSelectionModel().selectFirst();
     }
 
     @FXML