JavaFX primaryStage binding with TextField - javafx

Question

In JavaFx I'm currently trying to change the height of
primaryStage via binding.
primaryStage.setScene(scene);
primaryStage.setHeight(400.0);
primaryStage.widthProperty().bindBidirectional(textField.textProperty());
It's just a homework problem, not meaningful.
Unfortunately primaryStage is readOnlyDoubleProperty. May I change this settings to gain write-permissions?
I know, there is the possibility to change the window size via EventHandler, but I would like to change the window size on the fly through the TextField with bindings.
So any newly entered number enlarges the window.
Any ideas?

Answer 1

It's definitely possible and I hope there is a better way and no one should ever use this code ever but this is what I managed to make work
public class Main extends Application {
#Override
public void start(Stage primaryStage) {
TextField textField = new TextField();
//Allows for only numeric input
textField.setTextFormatter(new TextFormatter<>(change -> {
if (change.getText().matches("[0-9]*"))
return change;
else
return null;
}));
primaryStage.setScene(new Scene(textField));
primaryStage.setHeight(200.0);
//Allows Program to start without error
primaryStage.setMaxWidth(200);
//Binds min and max to ensure stage width change due to only 1 possible size
primaryStage.minWidthProperty().bind(primaryStage.maxWidthProperty());
//Bind textfield to width
textField.textProperty().bindBidirectional(primaryStage.maxWidthProperty(), new NumberStringConverter());
primaryStage.show();
}
}