Update structure JavaFX TreeTableView - javafx

Question

I create two windows and pass the Instance controller to the child window as a parameter. My problem is updating on the fly. I tried calling the refresh() method on treeTblState but nothing came of it.
First window
<AnchorPane xmlns="http://javafx.com/javafx/18" xmlns:fx="http://javafx.com/fxml/1" fx:controller="mo.specdoc.controllers.StateController">
<children>
<TreeTableView fx:id="treeTblState" showRoot="false">
<columns>
....
</columns>
</TreeTableView>
</children>
</AnchorPane>
Controller
public class StateController implements Initializable {
private static Map<Long, TreeItem> subdivisions = new HashMap<>();
private static StateController instance;
#FXML private TreeTableColumn<StateEntity, String> tblClmnTitle,...,tblClmnDelete;
#FXML private TreeTableView<StateEntity> treeTblState = new TreeTableView<>();
//Create root element (property setShow = false в FXML)
private StateEntity root = new StateEntity(0L,"State");
//Pattern Instance
public static StateController getInstance() {
if (instance == null) {
instance = new StateController();
}
return instance;
}
#Override
public void initialize(URL location, ResourceBundle resources) {
try {
tblClmnTitle.setCellValueFactory(new TreeItemPropertyValueFactory<>("postName"));
...
tblClmnDelete.setCellValueFactory(new TreeItemPropertyValueFactory<>("delete"));
treeGreate();
} catch ....
}
public void addChildren(StateEntity state) {
TreeItem<StateEntity> item = null;
for (Long key : subdivisions.keySet()) {
if (key == state.getSubdivisionId()) {
TreeItem<StateEntity> subdiv = subdivisions.get(key);
item = new TreeItem<StateEntity>(state);
subdiv.getChildren().add(item);
}
}
}
private void treeGreate() {
TreeItem<StateEntity> itemRoot = new TreeItem<StateEntity>(root);
treeTblState.setRoot(itemRoot);
//create tree - level 2
//subdivisions
for (SubdivisionEntity subdivision : subdivisionDAO.findAll()) {
StateEntity state = new StateEntity(
subdivision.getId(),
subdivision.getTitle()
);
state.getAdd().setOnAction(new EventHandler<ActionEvent>() {
#Override public void handle(ActionEvent e) {
createScene("Add post", new StateEntity(), subdivision.getId());
}
});
TreeItem<StateEntity> subdiv = new TreeItem<StateEntity>(state);
itemRoot.getChildren().add(subdiv);
subdivisions.put(state.getSubdivisionId(), subdiv);
//posts
List<StateEntity> childrens = stateDAO.findByIdSubdiv(state.getSubdivisionId());
if (!childrens.isEmpty()) {
for (StateEntity child : childrens) {
TreeItem<StateEntity> item = new TreeItem<StateEntity>(child);
subdiv.getChildren().add(item);
}
}
}
}
private void createScene(String title, StateEntity state, Long subdivisionId) {
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("/views/state-edit.fxml"));
StateEditController stateEditController = new StateEditController(state, subdivisionId);
loader.setController(stateEditController);
Stage stage = new Stage();
Scene scene = new Scene(loader.load());
stage.setScene(scene);
stage.initModality(Modality.APPLICATION_MODAL);
stage.showAndWait();
} catch ....
}
}
Result
Second window
<AnchorPane xmlns="http://javafx.com/javafx/18" xmlns:fx="http://javafx.com/fxml/1">
<children>
...elements...
</children>
</AnchorPane>
Controller
public class StateEditController implements Initializable {
....
#FXML
void saveAction(ActionEvent event) {
currentEntry.setSubdivisionId(subdivisionId);
currentEntry.setMaxAmountPersonal(cmbBoxMaxAmount.getSelectionModel().getSelectedItem().intValue());
currentEntry.setMinAmountPersonal(cmbBoxMaxAmount.getSelectionModel().getSelectedItem().intValue());
currentEntry.setAmplification(tglSwitchAmpl.isSelected());
currentEntry.setPostId(cmbBoxPost.getSelectionModel().getSelectedItem().getId());
if (currentEntry.getId() == null) {
stateDAO.save(currentEntry);
} else {
stateDAO.update(currentEntry);
}
stateController.addChildren(currentEntry); //call instance metod
}
#Override
public void initialize(URL location, ResourceBundle resources) {
....
}
}
Result
Everything is entered into the database successfully, but it is not updated when the window is closed 2.

Answer 1

I redraw the child elements using the clear method when adding an item
public void addChildren(StateEntity state) {
subdivisions.get(state.getSubdivisionId()).getChildren().clear();
List<StateEntity> childrens = stateDAO.findByIdSubdiv(state.getSubdivisionId());
if (!childrens.isEmpty()) {
for (StateEntity child : childrens) {
TreeItem<StateEntity> item = new TreeItem<StateEntity>(child);
subdivisions.get(state.getSubdivisionId()).getChildren().add(item);
}
}
}