Fixed multiple bugs concerning enterToSend and the postButton

src/main/java/envoy/client/ui/controller/ChatScene.java

@@ -197,6 +197,34 @@ public final class ChatScene {
 		sceneContext.<ContactSearchScene>getController().initializeData(sceneContext, localDB);
 	}
 
+	/**
+	 * Checks the text length of the {@code messageTextArea}, adjusts the
+	 * {@code remainingChars} - Label and checks whether to send the message
+	 * automatically.
+	 *
+	 * @param e the keys that have been entered
+	 * @since Envoy Client v0.1-beta
+	 */
+	@FXML
+	private void checkKeyCombination(KeyEvent e) {
+		// checks whether the text is too long
+		messageTextUpdated();
+		// Automatic sending of messages via (ctrl +) enter
+		checkPostConditions(e);
+	}
+
+	/**
+	 * @param e the keys that have been pressed
+	 * @since Envoy Client v0.1-beta
+	 */
+	@FXML
+	private void checkPostConditions(KeyEvent e) {
+		if (!postButton.isDisabled() && settings.isEnterToSend() && e.getCode() == KeyCode.ENTER
+				|| !settings.isEnterToSend() && e.getCode() == KeyCode.ENTER && e.isControlDown())
+			postMessage();
+		postButton.setDisable(messageTextArea.getText().isBlank() || currentChat == null);
+	}
+
 	/**
 	 * Actions to perform when the text was updated in the messageTextArea.
 	 *
@@ -210,29 +238,21 @@ public final class ChatScene {
 			messageTextArea.positionCaret(MAX_MESSAGE_LENGTH);
 			messageTextArea.setScrollTop(Double.MAX_VALUE);
 		}
+		designRemainingCharsLabel();
+	}
 
-		// Redesigning the remainingChars - Label
+	/**
+	 * Sets the text and text-color of the {@code remainingChars} - Label.
+	 *
+	 * @since Envoy Client v0.1-beta
+	 */
+	private void designRemainingCharsLabel() {
 		final int	currentLength	= messageTextArea.getText().length();
 		final int	remainingLength	= MAX_MESSAGE_LENGTH - currentLength;
 		remainingChars.setText(String.format("remaining chars: %d/%d", remainingLength, MAX_MESSAGE_LENGTH));
 		remainingChars.setTextFill(Color.rgb(currentLength, remainingLength, 0, 1));
 	}
 
-	/**
-	 * Actions to perform when a key has been entered.
-	 *
-	 * @param e the Keys that have been entered
-	 * @since Envoy Client v0.1-beta
-	 */
-	@FXML
-	private void checkKeyCombination(KeyEvent e) {
-		// Automatic sending of messages via (ctrl +) enter
-		if (!postButton.isDisabled() && settings.isEnterToSend() && e.getCode() == KeyCode.ENTER
-				|| !settings.isEnterToSend() && e.getCode() == KeyCode.ENTER && e.isControlDown())
-			postMessage();
-		postButton.setDisable(messageTextArea.getText().isBlank() || currentChat == null);
-	}
-
 	/**
 	 * Sends a new message to the server based on the text entered in the
 	 * messageTextArea.
@@ -241,10 +261,12 @@ public final class ChatScene {
 	 */
 	@FXML
 	private void postMessage() {
+		final var text = messageTextArea.getText().strip();
+		if (text.isBlank()) throw new IllegalArgumentException("A message without visible text can not be sent.");
 		try {
 			// Create and send message
 			final var message = new MessageBuilder(localDB.getUser().getID(), currentChat.getRecipient().getID(), localDB.getIDGenerator())
-				.setText(messageTextArea.getText().strip())
+				.setText(text)
 				.build();
 
 			// Send message
@@ -264,5 +286,6 @@ public final class ChatScene {
 		// Clear text field and disable post button
 		messageTextArea.setText("");
 		postButton.setDisable(true);
+		designRemainingCharsLabel();
 	}
 }

src/main/resources/fxml/ChatScene.fxml

@@ -27,7 +27,7 @@
 		<Button fx:id="settingsButton" mnemonicParsing="true" onAction="#settingsButtonClicked" text="_Settings" GridPane.columnIndex="2" GridPane.halignment="CENTER" GridPane.valignment="CENTER" />
 		<ListView fx:id="messageList" prefHeight="257.0" prefWidth="155.0" GridPane.columnIndex="1" GridPane.columnSpan="2" GridPane.rowIndex="1" GridPane.rowSpan="2" />
 		<Button fx:id="postButton" defaultButton="true" disable="true" mnemonicParsing="true" onAction="#postMessage" prefHeight="10.0" prefWidth="65.0" text="_Post" GridPane.columnIndex="2" GridPane.halignment="CENTER" GridPane.rowIndex="3" GridPane.valignment="CENTER" />
-      	<TextArea fx:id="messageTextArea" disable="true" onInputMethodTextChanged="#messageTextUpdated" onKeyPressed="#checkKeyCombination" onKeyTyped="#messageTextUpdated" prefHeight="200.0" prefWidth="200.0" wrapText="true" GridPane.columnIndex="1" GridPane.rowIndex="3" />
+      	<TextArea fx:id="messageTextArea" disable="true" onInputMethodTextChanged="#messageTextUpdated" onKeyPressed="#checkPostConditions" onKeyTyped="#checkKeyCombination" prefHeight="200.0" prefWidth="200.0" wrapText="true" GridPane.columnIndex="1" GridPane.rowIndex="3" />
       <Button mnemonicParsing="true" onAction="#addContactButtonClicked" text="_Add Contacts" GridPane.halignment="CENTER" GridPane.rowIndex="3" GridPane.valignment="CENTER">
          <padding>
             <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />