implemented a property

src/main/java/at/ionas999/questioncatalog/controller/ViewController.java

@@ -4,6 +4,11 @@ import at.ionas999.questioncatalog.model.Question;
 import at.ionas999.questioncatalog.model.QuestionCatalog;
 import at.ionas999.questioncatalog.services.QuestionCatalogService;
 import at.ionas999.questioncatalog.services.QuestionService;
+import javafx.beans.binding.Bindings;
+import javafx.beans.property.BooleanProperty;
+import javafx.beans.property.ObjectProperty;
+import javafx.beans.property.SimpleBooleanProperty;
+import javafx.beans.property.SimpleObjectProperty;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
@@ -23,9 +28,9 @@ public class ViewController {
     @FXML
     private ListView<Question> questionListView;
 
-    private Question currentQuestion;
+    private ObjectProperty<Question> currentQuestion = new SimpleObjectProperty<>();
     private ObservableList<Question> questions;
-    private boolean isInEditState;
+    private BooleanProperty isInEditState = new SimpleBooleanProperty(false);
 
     @FXML
     private void initialize() throws SQLException {
@@ -33,6 +38,12 @@ public class ViewController {
         selectBox.setItems(catalogs);
         selectBox.getSelectionModel().selectedItemProperty().addListener((_, _, newVal) -> loadQuestions(newVal));
         questionListView.getSelectionModel().selectedItemProperty().addListener((_, _, newVal) -> updateCurrentQuestion(newVal));
+
+        editButton.textProperty().bind(Bindings.when(isInEditState).then("Edit").otherwise("Save"));
+        questionField.editableProperty().bind(isInEditState);
+        answerField.editableProperty().bind(isInEditState);
+        deleteButton.disableProperty().bind(isInEditState);
+        questionListView.disableProperty().bind(isInEditState);
     }
 
     private void loadQuestions(QuestionCatalog catalog) {
@@ -47,42 +58,29 @@ public class ViewController {
 
     private void updateCurrentQuestion(Question question) {
         if (question == null) return;
-        currentQuestion = question;
+        currentQuestion.set(question);
         questionField.setText(question.getQuestion());
         answerField.setText(question.getAnswer());
     }
 
     @FXML
     private void deleteQuestion() {
-        if (currentQuestion == null || !showConfirmationButton("Delete question: \n" + currentQuestion.getQuestion())) return;
+        if (currentQuestion.get() == null || !showConfirmationButton("Delete question: \n" + currentQuestion.get().getQuestion())) return;
-        QuestionService.DeleteQuestion(currentQuestion.getId());
+        QuestionService.DeleteQuestion(currentQuestion.get().getId());
-        questions.remove(currentQuestion);
+        questions.remove(currentQuestion.get());
         questionListView.refresh();
         currentQuestion = null;
     }
 
     @FXML
     private void editQuestion() throws SQLException {
-        if (isInEditState) {
+        if (isInEditState.get()) {
-            currentQuestion.setQuestion(questionField.getText());
+            currentQuestion.get().setQuestion(questionField.getText());
-            currentQuestion.setAnswer(answerField.getText());
+            currentQuestion.get().setAnswer(answerField.getText());
-            QuestionService.UpdateQuestion(currentQuestion);
+            QuestionService.UpdateQuestion(currentQuestion.get());
-            toggleEditState(false);
+            isInEditState.set(false);
         } else {
-            toggleEditState(true);
+            isInEditState.set(true);
         }
     }
-
-    private void toggleEditState(boolean editing) {
-        isInEditState = editing;
-        editButton.setText(editing ? "Save" : "Edit");
-        setEditable(editing);
-    }
-
-    private void setEditable(boolean editable) {
-        questionField.setEditable(editable);
-        answerField.setEditable(editable);
-        questionListView.setDisable(editable);
-        deleteButton.setDisable(editable);
-    }
 }

src/main/java/at/ionas999/questioncatalog/model/Question.java

@@ -1,15 +1,18 @@
 package at.ionas999.questioncatalog.model;
 
+import javafx.beans.property.SimpleStringProperty;
+import javafx.beans.property.StringProperty;
+
 public class Question {
     private int id;
-    private String question;
+    private StringProperty answer = new SimpleStringProperty();
-    private String answer;
+    private StringProperty question = new SimpleStringProperty();
     private int questionCatalogId;
 
     public Question(int id,String question, String answer, int questionCatalogId) {
         this.id = id;
-        this.question = question;
+        this.question.set(question);
-        this.answer = answer;
+        this.answer.set(answer);
         this.questionCatalogId = questionCatalogId;
     }
 
@@ -18,19 +21,28 @@ public class Question {
         return questionCatalogId;
     }
     public String getQuestion() {
-        return question;
+        return question.get();
     }
 
     public void setQuestion(String question) {
-        this.question = question;
+        this.question.set(question);
     }
 
-    public String getAnswer() {
+    public StringProperty questionProperty()
+    {
+        return question;
+    }
+
+    public StringProperty answerProperty() {
         return answer;
     }
 
+    public String getAnswer() {
+        return answer.get();
+    }
+
     public void setAnswer(String answer) {
-        this.answer = answer;
+        this.answer.set(answer);
     }
 
     public void setQuestionCatalogId(int questionCatalogId) {
@@ -43,6 +55,6 @@ public class Question {
     }
     @Override
     public String toString() {
-        return question;
+        return question.get();
     }
 }