[FIXED] How to switch to new scenes without an Mouse/Drag/etc. event?

Issue

In my code I can switch to another scene using buttons like this:

public void handleButtonClick(MouseEvent event) throws IOException {
        Parent menu_parent = FXMLLoader.load(getClass().getResource("/FXML/FXMLmm2.fxml"));
        Scene SceneMenu = new Scene(menu_parent);
        Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
        stage.setScene(SceneMenu);
        stage.show();
}

Now I have a method in the controller class which should open a scene without an event:

public void showResult(boolean win) throws IOException {
        if (win == true) {
            Parent menu_parent = FXMLLoader.load(getClass().getResource("/FXML/FXMLWinScreen.fxml"));
            Scene SceneMenu = new Scene(menu_parent);
            Stage stage = new Stage();
            stage.setScene(SceneMenu);
            stage.show();
        }

The problem is, I don't know how to get the node for the stage, this program is only working when I open a whole new stage/window.

How can I switch to a new Scene without an events and opening a new stage?

Solution

You can use any @FXML injected node from your controller class,

Let's say you have a button

@FXML private Button show;

Now use that button show.getParent().getScene().getWindow() to get the current stage,

public void showResult(boolean win) throws IOException {
    if (win == true) {
        Parent menu_parent = FXMLLoader.load(getClass()
                               .getResource("/FXML/FXMLWinScreen.fxml"));
        Scene SceneMenu = new Scene(menu_parent);
        Stage stage = (Stage)show.getParent().getScene().getWindow();
        stage.setScene(SceneMenu);
        stage.show();
    }
}

But make SURE that showResult executes after the controller initialization and the node is injected.

Answered By - Shekhar Rai