Renamed method + made error dialog box customizable

src/main/java/no/ntnu/idatt1002/demo/controller/BudgetController.java

 package no.ntnu.idatt1002.demo.controller;
 
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.time.LocalDate;
 import java.util.Arrays;
 import java.util.List;
@@ -51,6 +53,13 @@ public class BudgetController implements FinanceController {
 
     @FXML
     private Button returnBtn;
+
+    @FXML
+    private Button backBtn;
+
+    @FXML
+    private Button continueBtn;
+
     @FXML
     private TableColumn<BudgetItem, Double> amountCol;
 
@@ -69,9 +78,6 @@ public class BudgetController implements FinanceController {
     @FXML
     private DatePicker date;
 
-    @FXML
-    private TableColumn<BudgetItem, Double> percentageColumn;
-
     @FXML
     private ObservableList<BudgetItem> budgetList;
 
@@ -85,7 +91,6 @@ public class BudgetController implements FinanceController {
 
     @FXML
     public void initialize() {
-        //TODO make budget item throw exception with negative amount
         //TODO specify error messgage for when amount is exceeded / duplicate exists
         //todo properly close screen so things are saved
         //Initialize table columns
@@ -93,16 +98,36 @@ public class BudgetController implements FinanceController {
         amountCol.setCellValueFactory(new PropertyValueFactory<BudgetItem, Double>("budgetAmount"));
         descriptionCol.setCellValueFactory(new PropertyValueFactory<BudgetItem, String>("budgetDescription"));
 
+        /*FileHandlingBudget fileHandlingBudget = new FileHandlingBudget();
+        try {
+            if (fileHandlingBudget.isEmpty("Budget")) {
+
+                returnBtn.setOpacity(0);
+            } else {
+                addBtn.setDisable(true);
+                editBtn.setDisable(true);
+                deleteBtn.setDisable(true);
+                backBtn.setOpacity(0);
+                continueBtn.setOpacity(0);
+            }
+
+        } catch(IOException ioe) {
+            showErrorDialogBox("File reading error", "Error in reading file", "Could not"
+                + "read from the Budget file");
+        }*/
+
         try { //Initialize registers, tableview and pie charts
             //if (FileHandlingBudget.hasBudgetSet - from line 4/5, so after the general amount and such) {
             //add, edit and delete buttons are removed.
+
+            //hvis linje fire er tom, instansier et nytt register, hvis ikke, last ned fra fil
             general = loadBudgetDataFromFile("Budget");
             budgetList = FXCollections.observableArrayList(general.getBudgetItems());
             budgetTableView.setItems(budgetList);
             refreshPieChart();
         } catch(IOException ioe) {
-            showErrorDialogBox("File reading error", "Error in reading from file", "An error occurred"
-                + "when reading the registers from file");
+            showErrorDialogBox("File reading error", "Error in reading from file", "Could not read"
+                + " registers from file");
         }
 
         setButtons();
@@ -112,6 +137,10 @@ public class BudgetController implements FinanceController {
         //sum.setText(String.valueOf(general.totalSum()));
     }
 
+    /**
+     * Method that disables or removes button, based on where the budget window
+     * is being used.
+     */
     private void setButtons() {
         FileHandlingBudget fileHandlingBudget = new FileHandlingBudget();
         try {
@@ -121,15 +150,13 @@ public class BudgetController implements FinanceController {
                 addBtn.setDisable(true);
                 editBtn.setDisable(true);
                 deleteBtn.setDisable(true);
+                backBtn.setOpacity(0);
+                continueBtn.setOpacity(0);
             }
 
         } catch(IOException ioe) {
-            Alert alert = new Alert(AlertType.CONFIRMATION);
-            alert.setTitle("Confirm Delete");
-            alert.setHeaderText("Delete Confirmation");
-            alert.setContentText("Are you sure you would like to delete the selected entry?");
-
-            alert.show();
+            showErrorDialogBox("File reading error", "Error in reading file", "Could not"
+                + "read from the Budget file");
         }
     }
 
@@ -318,23 +345,31 @@ public class BudgetController implements FinanceController {
     }
 
     /**
-     * Switches scenes back to main menu, by loading a new FXML file and setting the scene to this location.
+     * Switches scene, by loading a new FXML file and setting the scene to this location.
      * @param event A button click on the return to main menu button
-     * @throws IOException If an error occurs with loading any of the FXML files.
      */
     @FXML
-    public void returnToMainMenu(ActionEvent event) throws IOException {
-        //Adds unused categories to the table
-        general.addUnusedCategories();
-        //Always saving the data when switching scenes
-        saveDataToFile();
+    public void switchScene(ActionEvent event) {
         FXMLLoader loader = new FXMLLoader();
-        loader.setLocation(getClass().getResource("/view/MainMenuNew.fxml"));
-
-        Parent root = loader.load();
-        Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
-        Scene scene = new Scene(root);
-        stage.setScene(scene);
-        stage.show();
+        try {
+            if (event.getSource() == returnBtn || event.getSource() == continueBtn) {
+                //Adds unused categories to the table
+                general.addUnusedCategories();
+                //Always saving the data when switching scenes
+                saveDataToFile();
+                loader.setLocation(getClass().getResource("/view/MainMenuNew.fxml"));
+            } else if (event.getSource() == backBtn) {
+                loader.setLocation(getClass().getResource("/view/dualList.fxml"));
+            }
+            Parent root = loader.load();
+            Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
+            Scene scene = new Scene(root);
+            stage.setScene(scene);
+            stage.show();
+
+        } catch(Exception ioe) {
+            showErrorDialogBox("Loading error", "Error in loading", "Could load"
+                + "to FXML file");
+        }
     }
 }