JavaFX button.arm() not working. Are there other ways to? - button

Question

I am trying to auto press a button in my application so that it triggers a function.
As per the java docs, the .arm() button should do this. But it does not.
I also tried .fire(), but with no luck.
Any ideas on how to get a button be clicked on its own?

Answer 1

button.fire() works and is the right method to use to trigger an automated button press.
Here is a short sample which demonstrates it's use:
A timeline is started which automatically fires a button every second. When the button is fired it increments the counter label below the button.
import javafx.animation.*;
import javafx.application.Application;
import javafx.geometry.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Duration;
public class Clicker extends Application {
#Override
public void start(Stage stage) throws Exception {
Label counter = new Label("0");
Button clicker = new Button("Auto-clicked");
clicker.setOnAction(event ->
counter.setText(
(1 + Integer.parseInt(counter.getText())) + ""
)
);
Timeline ticker = new Timeline(
new KeyFrame(
Duration.seconds(1),
event -> clicker.fire()
)
);
ticker.setCycleCount(1_000_000);
ticker.play();
VBox layout = new VBox(10, clicker, counter);
layout.setAlignment(Pos.CENTER);
layout.setPadding(new Insets(10));
stage.setScene(new Scene(layout));
stage.show();
}
public static void main(String[] args) {
launch(Clicker.class);
}
}