How to set a window always on top of another specific window in javafx

Question

I have a toolbox that needs to stay always on top of the main window, but not of any other windows. So what I would need is a .setAlwaysOnTop(true) but for a specific window. How do I do that?

Answer 1

When you create the second Stage you have to call initOwner and initModality with Modality.WINDOW_MODAL . Then the new stage is always on top of the other but you can't interact with the parent stage.

For example:

public void createNewStage(Window parent) {
    //... all the other stuff
    Stage onTop = new Stage();
    onTop.initOwner(parent);
    onTop.initModality(Modality.WINDOW_MODAL);
    onTop.show();
}