JavaFX: Issue with setting same Node to multiple t

Question

I am trying to set a particular node to more than one tabs on a tab pane. The problem is that only the last tab has the node when the application is launched but the rest of the tabs are shown empty.

I am attaching the code and a few screen shots to explain the problem:

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.geometry.Side;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class TabExample extends Application
{

public static void main(String[] args)
{
    Application.launch(args);
}

@Override
public void start(Stage primaryStage)
{
    primaryStage.setTitle("Tabs");
    Group root = new Group();
    Scene scene = new Scene(root, 400, 250, Color.WHITE);

    TabPane tabPane = new TabPane();

    BorderPane borderPane = new BorderPane();

    Text myText = new Text("Hello");

    for (int i = 0; i < 5; i++)
    {
        Tab tab = new Tab();
        tab.setText("Tab"
            + i);
        HBox hbox = new HBox();
        hbox.getChildren().add(new Label("Tab"
            + i));
        hbox.setAlignment(Pos.CENTER);
        tab.setContent(myText);
        tab.setClosable(false);
        tabPane.getTabs().add(tab);
    }
    tabPane.setSide(Side.BOTTOM);

    // bind to take available space
    borderPane.prefHeightProperty().bind(scene.heightProperty());
    borderPane.prefWidthProperty().bind(scene.widthProperty());

    borderPane.setCenter(tabPane);
    root.getChildren().add(borderPane);
    primaryStage.setScene(scene);
    primaryStage.show();
}
}

Please let me know if there is anything wrong with what I am doing or is it a known bug?

Answer 1

In JavaFX, each Node can have exactly one (1) Parent. See the Node Class Page in the JavaFX API. If you add a Node to another Parent, the Node looses its "connection" with the old Parent, which means it will not be displayed or accessable under the old Parent. The method which causes this in your source code is tab.setContent(myText);.

To solve your problem, you have to create five different (=separate) objects and set each one of them to exactly one TabPane as child // content .