Merge branch 'dev' into feature_controllerPlantList_M2

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

@@ -10,10 +10,16 @@ import javafx.scene.layout.AnchorPane;
 
 import java.io.IOException;
 import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.Objects;
 import java.util.ResourceBundle;
 
 public class MainFXMLController implements Initializable {
+    /**
+     * Caching the panes
+     */
+    private final Map<String, AnchorPane> panes = new HashMap<>();
 
     @FXML
     private Button home_button;
@@ -62,12 +68,17 @@ public class MainFXMLController implements Initializable {
      * @throws IOException exception when file does not exist
      */
     public void loadPane(String fxmlFile) throws IOException {
-        AnchorPane anchorPane;
-        FXMLLoader loader = new FXMLLoader(Objects.requireNonNull(HelloApplication.class.getResource(fxmlFile)));
-        anchorPane = loader.load();
-        if(fxmlFile.equals("MyPlants.fxml")) {
-            MyPlantsController myPlantsController = loader.getController();
-            myPlantsController.getMainController(this);
+
+        AnchorPane anchorPane = panes.get(fxmlFile);
+        if (anchorPane == null) {
+            FXMLLoader loader = new FXMLLoader(Objects.requireNonNull(HelloApplication.class.getResource(fxmlFile)));
+            anchorPane = loader.load();
+            panes.put(fxmlFile, anchorPane);
+
+            if(fxmlFile.equals("MyPlants.fxml")) {
+                MyPlantsController myPlantsController = loader.getController();
+                myPlantsController.getMainController(this);
+            }
         }
         mainPane.getChildren().setAll(anchorPane);
         anchorPane.prefWidthProperty().bind(mainPane.widthProperty());