JavaFX Using alternative FXML structure for Title (Stage is root) - title

Question

I read answer about putting Title in FXML (JavaFx : Set window title in fxml file), but I don't understand how to call this code.
I can't call it in the classic way:
FXMLLoader loader = new FXMLLoader(getClass().getResource("some.fxml"));
Scene scene = new Scene(loader.load());
Stage stage = new Stage();
stage.initOwner(root.getScene().getWindow());
stage.initModality(Modality.WINDOW_MODAL);
stage.setScene(scene);
stage.show();
some.fxml
<?xml version="1.0" encoding="utf-8"?>
<?import javafx.scene.layout.VBox?>
<?import javafx.stage.Stage?>
<?import javafx.scene.Scene?>
<?import javafx.scene.control.Label?>
<Stage title="Some Stage">
<scene>
<Scene>
<VBox xmlns:fx="http://javafx.com/fxml">
<children>
<Label text="John Doe"/>
</children>
</VBox>
</Scene>
</scene>
</Stage>

Answer 1

Because the fxml is creating a stage, you don't need to create another stage in your Java code, just get a reference to the stage created by FXML and show it directly.
StageLoader.java
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.*;
import java.io.IOException;
public class StageLoader extends Application {
private void showDialog(Stage owner) {
try {
FXMLLoader loader = new FXMLLoader(
getClass().getResource("some.fxml")
);
Stage dialog = loader.load();
dialog.initOwner(owner);
dialog.initModality(Modality.WINDOW_MODAL);
dialog.initStyle(StageStyle.UTILITY);
dialog.show();
} catch (IOException e) {
System.out.println("Unable to load dialog FXML");
e.printStackTrace();
}
}
#Override
public void start(final Stage stage) throws IOException {
Button openDialog = new Button("Open Dialog");
openDialog.setOnAction(event -> showDialog(stage));
stage.setTitle("Main Window");
stage.setScene(
new Scene(
new StackPane(openDialog),
200, 200
)
);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
I made a couple of minor modifications to the fxml to ensure the resultant stage is large enough to actually see the dialog stage title.
some.fxml
<?xml version="1.0" encoding="utf-8"?>
<?import javafx.scene.layout.VBox?>
<?import javafx.stage.Stage?>
<?import javafx.scene.Scene?>
<?import javafx.scene.control.Label?>
<Stage title="Some Stage" resizable="false" xmlns:fx="http://javafx.com/fxml" >
<scene>
<Scene>
<VBox >
<children>
<Label text="John Doe" prefWidth="150"/>
</children>
</VBox>
</Scene>
</scene>
</Stage>
SceneBuilder who can't open FXML after adding Stage and Scene tags.
You could write the FXML with the stage and scene definitions as an outer shell with an embedded <fx:include..> statement to include an inner FXML document which could be opened edited directly in SceneBuilder. Also, you could create a feature request against SceneBuilder (it is called the "design tool" in the issue tracker), to request direct support for FXML files with stage roots and scenes included in the FXML.