The following is a SSCCE code I have simulated your use case. At the result there was no table disturbing, or pane shrinking. Test it yourself and compare it with yours:
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TitledPane;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class PaneDemo extends Application {
private TableView<NodeInfo> table = new TableView<NodeInfo>();
private final ObservableList<NodeInfo> data = FXCollections.observableArrayList();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
stage.setWidth(450);
stage.setHeight(500);
TableColumn firstNameCol = new TableColumn("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(new PropertyValueFactory<NodeInfo, String>("firstName"));
TableColumn paneCol = new TableColumn("Pane");
paneCol.setMinWidth(100);
paneCol.setCellValueFactory(new PropertyValueFactory<NodeInfo, TitledPane>("titledPane"));
for (int i = 0; i < 5; i++) {
TitledPane pane = new TitledPane("title " + i, new Text("text " + i));
data.add(new NodeInfo("name " + i, pane));
}
table.setItems(data);
table.getColumns().addAll(firstNameCol, paneCol);
Button btn = new Button("add new item");
btn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
TitledPane pane = new TitledPane("title new", new Text("text new"));
data.add(new NodeInfo("name new", pane));
}
});
final VBox vbox = new VBox(20);
vbox.getChildren().addAll(table, btn);
((Group) scene.getRoot()).getChildren().addAll(vbox);
stage.setScene(scene);
stage.show();
}
public static class NodeInfo {
private final SimpleStringProperty firstName;
private TitledPane titledPane;
private NodeInfo(String fName, TitledPane titledPane) {
this.firstName = new SimpleStringProperty(fName);
this.titledPane = titledPane;
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String fName) {
firstName.set(fName);
}
public TitledPane getTitledPane() {
return titledPane;
}
public void setTitledPane(TitledPane fName) {
titledPane = fName;
}
}
}