Added demo thread

src/Main.java

 import javafx.application.Application;
 import javafx.stage.Stage;
+import model.Demo;
 import model.OSInterface;
 import ui.MainScreen;
 
@@ -16,7 +17,9 @@ public class Main extends Application {
 
     public static void main(String[] args) {
         Thread thread = new Thread(OSInterface.getInstance());
+        Thread demoThread = new Thread(new Demo());
         thread.start();
+        demoThread.start();
 
         launch(args);
 

src/model/Demo.java

+package model;
+
+public class Demo implements Runnable {
+    int id = 0;
+    boolean stop = false;
+
+    public Demo() {
+
+    }
+
+     public void run() {
+         while (!stop) {
+             if (OSInterface.getInstance().wasPressed(id)) {
+
+             }
+         }
+     }
+
+     public void stop() {
+        stop = true;
+     }
+}

src/ui/MainScreen.java

@@ -6,6 +6,7 @@ import javafx.scene.control.ComboBox;
 import javafx.scene.layout.Pane;
 import javafx.stage.Stage;
 import model.Hotkey;
+import model.Modifier;
 import model.OSInterface;
 
 /**
@@ -144,7 +145,7 @@ public class MainScreen extends Pane {
         save.setStyle("-fx-background-color: #2c2f33; -fx-text-fill: white; -fx-font-size: 16; -fx-vertical-align: middle; " +
                 "-fx-pref-width: 100px; -fx-pref-height: 50px; -fx-text-align: center;");
         save.setOnAction(e -> {
-            Hotkey newHotkey = new Hotkey(KBV.getKeyToBind(), id, KBV.getKeyAction());
+            Hotkey newHotkey = new Hotkey(KBV.getKeyToBind(), id, Modifier.NONE.val());
             id ++;
             boolean register = OSInterface.getInstance().registerHotkey(newHotkey);
             primaryStage.setScene(mainScreenScene);