JavaFX Stage/Scene automatic resize

Question

Like the picture showed, the red box above is a GridBox and below is a VBox with Splitpane (ListView) and Gridpane (2 Buttons). What I want to implement is to hide

Answer 1

I don't have enough reputation to make a comment (need 50, but I have 48) so I will make an answer. Now back on topic, try calling the method sizeToScene on your stage object after you remove the node.

https://docs.oracle.com/javase/8/javafx/api/javafx/stage/Window.html#sizeToScene--

Answer 2

I think Dusko is right given your approach, but I am asking why recreate the wheel? In this example, I use a TitledPane and adjust the Stage as the Scene's height gets larger or smaller. Thanks, @James_D for info on how to implement this.

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.Accordion;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.control.TitledPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 *
 * @author blj0011
 */
public class JavaFXApplication97 extends Application
{

    @Override
    public void start(Stage primaryStage)
    {
        Label tpLabel = new Label("text here!");
        TextField tpTextField = new TextField();
        Button tpButton = new Button("OK");
        HBox tpHBox = new HBox(tpTextField, tpButton);
        VBox topPanel = new VBox(tpLabel, tpHBox);

        TextArea bpTextArea = new TextArea();
        Button bpButton = new Button("Button");
        VBox bpVBox = new VBox(bpTextArea, bpButton);
        TextArea bpTextArea2 = new TextArea();
        Button bpButton2 = new Button("Button2");
        VBox bpVBox2 = new VBox(bpTextArea2, bpButton2);
        HBox bpHBox = new HBox(bpVBox, bpVBox2);

        TitledPane titledPane = new TitledPane();
        titledPane.setText("");
        titledPane.setContent(bpHBox);
        titledPane.setAnimated(false);
        Accordion bottomPanel = new Accordion(titledPane);
        VBox root = new VBox(topPanel, bottomPanel);

        //This adjust the Stage when the height of the Accordian change.
        bottomPanel.expandedPaneProperty().addListener((obs, oldVal, newVal) -> {
            System.out.println("hello");
            Platform.runLater(() -> {
                primaryStage.sizeToScene();    
            });
        });

        Scene scene = new Scene(root);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        launch(args);
    }

}