JavaFX resizing root stackpane - javafx-2

Question

i'd like to have a StackPane as the root node, it makes overlay effects easy.
But by using a stackpane as the root, inner controls can move out of the window.
In the following example you can see the controls moving out of the window ,
if you shrink the window small enough, e.g. both the menubar and the listview go out to the left. I want to prevent this, how can i do that?
package test;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class App extends Application {
#Override
public void start(Stage stage) throws Exception {
stage.setTitle("controls move out of window :(");
Menu menu = new Menu("Menu");
MenuBar menubar = new MenuBar(menu);
ListView<String> listView = new ListView<>(FXCollections.observableArrayList("Args, it moves away."));
BorderPane borderPane = new BorderPane();
borderPane.setTop(menubar);
borderPane.setLeft(listView);
StackPane rootStackPane = new StackPane(borderPane);
Scene scene = new Scene(rootStackPane);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Update:
setting the alignment for the BorderPane inside the StackPane seems to help:
public void start(Stage stage) throws Exception {
stage.setTitle("controls stay in window :)");
Menu menu = new Menu("Menu");
MenuBar menubar = new MenuBar(menu);
ListView<String> listView = new ListView<>(FXCollections.observableArrayList("it stays!"));
BorderPane borderPane = new BorderPane();
borderPane.setTop(menubar);
borderPane.setLeft(listView);
StackPane rootStackPane = new StackPane(borderPane);
StackPane.setAlignment(borderPane, Pos.TOP_LEFT);
Scene scene = new Scene(rootStackPane);
stage.setScene(scene);
stage.show();
}

Answer 1

Place your stack in a Group and bind the stack's preferred size to the scene's preferred size.
As you can see from the second image, the overlay is not centered on the visible screen, it is centered on the StackPane. The StackPane's minimum size will be the minimum size of it's largest component (even if it overflows the screen), so the overlay is centered on that. To find out minimum sizes of things, you could use either design the UI in SceneBuilder or debug the UI using ScenicView.
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
public class App extends Application {
#Override
public void start(Stage stage) throws Exception {
stage.setTitle("controls stay in window :)");
Menu menu = new Menu("Menu");
MenuBar menubar = new MenuBar();
menubar.getMenus().add(menu);
ListView<String> listView = new ListView<>(FXCollections.observableArrayList("Args, it moves away."));
BorderPane borderPane = new BorderPane();
borderPane.setTop(menubar);
borderPane.setLeft(listView);
borderPane.setStyle("-fx-background-color: palegreen;");
Node overlayContent = new Label("centered");
StackPane stack = new StackPane(borderPane, overlayContent);
Scene scene = new Scene(new Group(stack));
stage.setScene(scene);
stage.show();
stack.prefWidthProperty().bind(scene.widthProperty());
stack.prefHeightProperty().bind(scene.heightProperty());
}
public static void main(String[] args) {
launch(args);
}
}