Add exit handler

src/main/java/app/MainController.java

@@ -8,8 +8,10 @@ import com.google.common.eventbus.EventBus;
 import com.google.common.eventbus.Subscribe;
 
 import app.controllers.*;
+import app.events.ExitApplicationEvent;
 import app.events.LanguageChangedEvent;
 import app.model.Model;
+import javafx.application.Platform;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
 
@@ -71,4 +73,11 @@ public class MainController implements Initializable {
     Model.getScene().getStylesheets().add(nextStyleSheet);
   }
 
+  @Subscribe
+  private void handle(ExitApplicationEvent event) {
+    // TODO: send save file event, exit application safely.
+
+    Platform.exit();
+  }
+
 }

src/main/java/app/controllers/MenubarController.java

@@ -7,8 +7,8 @@ import java.util.ResourceBundle;
 import com.google.common.eventbus.EventBus;
 import com.google.common.eventbus.Subscribe;
 
+import app.events.ExitApplicationEvent;
 import app.events.LanguageChangedEvent;
-import app.model.Model;
 import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
@@ -84,6 +84,7 @@ public class MenubarController implements Initializable, Controller {
 
   /**
    * Handles the event where the language was change from the menu.
+   * @param event
    */
   @FXML
   private void handleLanguageChange(ActionEvent event) {
@@ -92,8 +93,18 @@ public class MenubarController implements Initializable, Controller {
         ((RadioMenuItem) event.getSource()).getText()));
   }
 
+  /**
+   * Handles the event where there was an exit request from the menu.
+   * @param event
+   */
+  @FXML
+  private void handleExitApplication(ActionEvent event) {
+    this.eventBus.post(new ExitApplicationEvent());
+  }
+
   /**
    * Updates menubuttons whenever the language is changed
+   * @param event
    */
   @Subscribe
   private void handle(LanguageChangedEvent event) {

src/main/java/app/events/ExitApplicationEvent.java

@@ -0,0 +1,5 @@
+package app.events;
+
+public class ExitApplicationEvent {
+  
+}