CODEWITHSUNDEEP
javajavafxkeylistenercapslock
user2734182
user2734182

Reputation: 1955

Get CapsLock-state in JavaFX

I'm trying to build an input form with several checks. One of those is to check if CapsLock is active. It works if I try to build this function together with Java Swing, see code below. But in JavaFX, it DOES not work at all. I get the same state every time I check; it seems like my application just asks for the initial state, and then saves it, and present it further...

JavaSwing (Works just fine)

frame.addKeyListener(new KeyListener() {
        public void keyTyped(KeyEvent e) {
            if(e.getKeyCode() == KeyEvent.VK_CAPS_LOCK){
                System.out.println(Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK));
            } else if(e.isShiftDown()){
                System.out.println("SHIFT");
            }
        }

        public void keyPressed(KeyEvent e) {
            if(e.getKeyCode() == KeyEvent.VK_CAPS_LOCK){
                System.out.println(Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK));
            } else if(e.isShiftDown()){
                System.out.println("SHIFT");
            }
        }

        public void keyReleased(KeyEvent e) {
            if(e.getKeyCode() == KeyEvent.VK_CAPS_LOCK){
                System.out.println(Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK));
            } else if(e.isShiftDown()){
                System.out.println("SHIFT");
            }
        }
});

JavaFX (Always present the same state)

scene.setOnKeyReleased(new EventHandler<javafx.scene.input.KeyEvent>() {
    @Override
    public void handle(javafx.scene.input.KeyEvent event) {
        if(event.getCode() == KeyCode.CAPS){
            System.out.println("CAPS");
            System.out.println(Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK));
        }
    }
});

Does anyone know why? What can i do?

Upvotes: 3

Views: 2307

Answers (1)

JohnRW
JohnRW

Reputation: 778

Edit: It seems like the issue is a windows related one. This question has an answer that might work for you

This works for me with the following console output when pressing caps lock repeatedly:

Capslock pressed

Capslock state: true

Capslock pressed

Capslock state: false

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.input.KeyCode;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

import java.awt.*;
import java.awt.event.KeyEvent;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {

        Pane root = new Pane();
        Scene scene = new Scene(root, 500, 500);

        primaryStage.setScene(scene);
        primaryStage.show();

        //scene.setOnKeyPressed( event -> {
        scene.setOnKeyReleased( event -> {
            if ( event.getCode() == KeyCode.CAPS ) {
                System.out.println("Capslock pressed");
                System.out.println("Capslock state: " + Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK));
            }
        });

    }

    public static void main(String[] args) {
        launch(args);
    }
}

I'm not sure what the issue is?

Upvotes: 2

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