Add message editing

Which constrains the message format and layout

src/main/java/name/nathanmcrae/NumbersStation.fxml

@@ -82,7 +82,7 @@
             <Insets bottom="10.0" />
          </padding>
       </VBox>
-      <TextArea layoutY="110.0" prefHeight="270.0" prefWidth="640.0" text="0239 0480 2938 0928&#10;3093 2298 3923 8933" wrapText="true" AnchorPane.bottomAnchor="40.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="110.0">
+      <TextArea fx:id="messageTextArea" layoutY="110.0" prefHeight="270.0" prefWidth="640.0" text="0239 0480 2938 0928&#10;3093 2298 3923 8933" wrapText="true" AnchorPane.bottomAnchor="40.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="110.0">
          <font>
             <Font size="30.0" />
          </font>

src/main/java/name/nathanmcrae/NumbersStationController.java

@@ -2,16 +2,26 @@ package name.nathanmcrae;
 
 import javafx.fxml.FXML;
 import javafx.fxml.FXMLLoader;
+import javafx.fxml.Initializable;
+import javafx.scene.input.KeyEvent;
+import javafx.scene.input.KeyCode;
 import javafx.scene.Parent;
 import javafx.scene.Scene;
 import javafx.stage.Stage;
 import javafx.scene.control.Label;
+import javafx.scene.control.TextArea;
+
+import java.net.URL;
+import java.util.ResourceBundle;
+
+public class NumbersStationController implements Initializable {
+    private Stage configStage;
 
-public class NumbersStationController {
     @FXML
     private Label lastRetrievedLabel;
 
-    private Stage configStage;
+    @FXML
+    private TextArea messageTextArea;
 
     @FXML
     private void handleButtonPress() {
@@ -33,4 +43,50 @@ public class NumbersStationController {
             configStage.toFront();
         }
     }
+
+    @Override
+    public void initialize(URL location, ResourceBundle resources) {
+        messageTextArea.addEventFilter(KeyEvent.ANY, event -> {
+            int cursorPosition = messageTextArea.getCaretPosition();
+
+            String character = event.getCharacter();
+            KeyCode code = event.getCode();
+
+            String str = event.getText();
+
+            // Consume the event to block the default behavior
+            if (!(code == KeyCode.LEFT ||
+                  code == KeyCode.RIGHT ||
+                  code == KeyCode.UP ||
+                  code == KeyCode.DOWN ||
+                  code == KeyCode.HOME ||
+                  code == KeyCode.END ||
+                  code == KeyCode.PAGE_UP ||
+                  code == KeyCode.PAGE_DOWN)) {
+                event.consume();
+            }
+
+            if (event.getEventType() == KeyEvent.KEY_PRESSED &&
+                (code == KeyCode.DIGIT0 ||
+                 code == KeyCode.DIGIT1 ||
+                 code == KeyCode.DIGIT2 ||
+                 code == KeyCode.DIGIT3 ||
+                 code == KeyCode.DIGIT4 ||
+                 code == KeyCode.DIGIT5 ||
+                 code == KeyCode.DIGIT6 ||
+                 code == KeyCode.DIGIT7 ||
+                 code == KeyCode.DIGIT8 ||
+                 code == KeyCode.DIGIT9)) {
+
+                if (cursorPosition < messageTextArea.getLength()) {
+                    char currentChar = messageTextArea.getText().charAt(cursorPosition);
+                    if (Character.isWhitespace(currentChar)) {
+                        messageTextArea.replaceText(cursorPosition + 1, cursorPosition + 2, str);
+                    } else {
+                        messageTextArea.replaceText(cursorPosition, cursorPosition + 1, str);
+                    }
+                }
+            }
+        });
+    }
 }