refactor: removed MainFXMLController from dependencies

Replaced MainFXMLController-based scene-changing with event-based scene-changing to remove cyclic dependency

src/main/java/ch/zhaw/gartenverwaltung/MainFXMLController.java

@@ -1,21 +1,25 @@
 package ch.zhaw.gartenverwaltung;
 
+import ch.zhaw.gartenverwaltung.bootstrap.AfterInject;
 import ch.zhaw.gartenverwaltung.bootstrap.AppLoader;
+import ch.zhaw.gartenverwaltung.bootstrap.ChangeViewEvent;
+import ch.zhaw.gartenverwaltung.bootstrap.Inject;
+import javafx.event.EventHandler;
 import javafx.fxml.FXML;
-import javafx.fxml.Initializable;
 import javafx.scene.control.Button;
 import javafx.scene.layout.AnchorPane;
 import javafx.scene.layout.Pane;
 
 import java.io.IOException;
-import java.net.URL;
-import java.util.ResourceBundle;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
-public class MainFXMLController implements Initializable {
+public class MainFXMLController {
     private static final Logger LOG = Logger.getLogger(MainFXMLController.class.getName());
-    private final AppLoader appLoader = new AppLoader(this);
+
+    @Inject
+    AppLoader appLoader;
+
     @FXML
     private Button home_button;
 
@@ -31,29 +35,26 @@ public class MainFXMLController implements Initializable {
     @FXML
     private Button plants_button;
 
-    public MainFXMLController() throws IOException {
-    }
-
     @FXML
-    void goToHome() throws IOException {
+    void goToHome() {
         showPaneAsMainView("Home.fxml");
         styleChangeButton(home_button);
     }
 
     @FXML
-    void goToMyPlants() throws IOException {
+    void goToMyPlants() {
         showPaneAsMainView("MyGarden.fxml");
         styleChangeButton(myGarden_button);
     }
 
     @FXML
-    void goToMySchedule() throws IOException {
+    void goToMySchedule() {
         showPaneAsMainView("MySchedule.fxml");
         styleChangeButton(mySchedule_button);
     }
 
     @FXML
-    void goToPlants() throws IOException {
+    void goToPlants() {
         showPaneAsMainView("Plants.fxml");
         styleChangeButton(plants_button);
     }
@@ -63,15 +64,22 @@ public class MainFXMLController implements Initializable {
      * set HGrow and VGrow to parent AnchorPane.
      * Sends MainController to other Controllers.
      * @param fxmlFile string of fxml file
-     * @throws IOException exception when file does not exist
      */
-    public void showPaneAsMainView(String fxmlFile) throws IOException {
-        Pane anchorPane = appLoader.loadPane(fxmlFile);
-        mainPane.getChildren().setAll(anchorPane);
-        anchorPane.prefWidthProperty().bind(mainPane.widthProperty());
-        anchorPane.prefHeightProperty().bind(mainPane.heightProperty());
+    public void showPaneAsMainView(String fxmlFile) {
+        try {
+            Pane anchorPane = appLoader.loadPane(fxmlFile);
+            mainPane.getChildren().setAll(anchorPane);
+            anchorPane.prefWidthProperty().bind(mainPane.widthProperty());
+            anchorPane.prefHeightProperty().bind(mainPane.heightProperty());
+
+            anchorPane.removeEventHandler(ChangeViewEvent.CHANGE_MAIN_VIEW, changeMainViewHandler);
+            anchorPane.addEventHandler(ChangeViewEvent.CHANGE_MAIN_VIEW, changeMainViewHandler);
+        } catch (IOException e) {
+            LOG.log(Level.SEVERE, "Could not load pane.", e);
+        }
     }
 
+    private final EventHandler<ChangeViewEvent> changeMainViewHandler = (ChangeViewEvent event) -> showPaneAsMainView(event.view());
 
     private void preloadPanes() throws IOException {
         appLoader.loadAndCacheFxml("MyGarden.fxml");
@@ -87,8 +95,9 @@ public class MainFXMLController implements Initializable {
      * loads the default FXML File
      * {@inheritDoc}
      */
-    @Override
-    public void initialize(URL url, ResourceBundle resourceBundle) {
+    @AfterInject
+    @SuppressWarnings("unused")
+    public void init() {
         try {
             preloadPanes();
             showPaneAsMainView("Home.fxml");