Add offline mode check box and connection label to login dialog

src/main/java/envoy/client/ui/LoginDialog.java

@@ -49,6 +49,12 @@ public final class LoginDialog extends Dialog<Void> {
 	@FXML
 	private CheckBox registerCheckBox;
 
+	@FXML
+	private CheckBox offlineCheckBox;
+
+	@FXML
+	private Label connectionLabel;
+
 	private final Client			client;
 	private final LocalDB			localDB;
 	private final Cache<Message>	receivedMessageCache;
@@ -97,8 +103,12 @@ public final class LoginDialog extends Dialog<Void> {
 			if (registerCheckBox.isSelected() && !passwordField.getText().equals(repeatPasswordField.getText())) {
 				clearPasswordFields();
 				new Alert(AlertType.ERROR, "The entered password is unequal to the repeated one").showAndWait();
-			} else
+			} else {
-				performHandshake(new LoginCredentials(userTextField.getText(), passwordField.getText().toCharArray(), registerCheckBox.isSelected()));
+				final var credentials = new LoginCredentials(userTextField.getText(), passwordField.getText().toCharArray(),
+						registerCheckBox.isSelected());
+				if (!offlineCheckBox.isSelected()) performHandshake(credentials);
+				else attemptOfflineMode(credentials);
+			}
 		});
 
 		// Perform automatic login if configured
@@ -112,6 +122,7 @@ public final class LoginDialog extends Dialog<Void> {
 
 	@FXML
 	private void initialize() {
+		connectionLabel.setText("Server: " + config.getServer() + ":" + config.getPort());
 
 		// Show an alert after an unsuccessful handshake
 		eventBus.register(HandshakeRejectionEvent.class,
@@ -128,11 +139,6 @@ public final class LoginDialog extends Dialog<Void> {
 		clearPasswordFields();
 	}
 
-	private void abortLogin() {
-		logger.info("The login process has been cancelled. Exiting...");
-		System.exit(0);
-	}
-
 	private void performHandshake(LoginCredentials credentials) {
 		try {
 			client.performHandshake(credentials, receivedMessageCache);
@@ -143,23 +149,32 @@ public final class LoginDialog extends Dialog<Void> {
 		} catch (IOException | InterruptedException | TimeoutException e) {
 			logger.warning("Could not connect to server: " + e);
 			logger.finer("Attempting offline mode...");
+			attemptOfflineMode(credentials);
+		}
+	}
+
+	private void attemptOfflineMode(LoginCredentials credentials) {
 		try {
 			// Try entering offline mode
 			localDB.loadUsers();
 			User clientUser = (User) localDB.getUsers().get(credentials.getIdentifier());
 			if (clientUser == null) throw new EnvoyException("Could not enter offline mode: user name unknown");
 			client.setSender(clientUser);
-				new Alert(AlertType.WARNING, "A connection to the server could not be established. Starting in offline mode.\n" + e).showAndWait();
+			new Alert(AlertType.WARNING, "A connection to the server could not be established. Starting in offline mode.").showAndWait();
 			hide();
-			} catch (Exception e1) {
+		} catch (Exception e) {
 			new Alert(AlertType.ERROR, "Client error: " + e).showAndWait();
 			System.exit(1);
 		}
 	}
-	}
 
 	private void clearPasswordFields() {
 		passwordField.clear();
 		repeatPasswordField.clear();
 	}
+
+	private void abortLogin() {
+		logger.info("The login process has been cancelled. Exiting...");
+		System.exit(0);
+	}
 }

src/main/resources/fxml/LoginDialog.fxml

@@ -11,7 +11,7 @@
 <?import javafx.scene.layout.VBox?>
 <?import javafx.scene.text.Font?>
 
-<DialogPane prefHeight="201.0" prefWidth="525.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1">
+<DialogPane prefHeight="265.0" prefWidth="545.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1">
 	<content>
 		<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="217.0" prefWidth="545.0">
 			<children>
@@ -40,6 +40,8 @@
 					</children>
 				</GridPane>
 				<CheckBox fx:id="registerCheckBox" mnemonicParsing="false" onAction="#registerCheckboxChanged" prefHeight="17.0" prefWidth="181.0" text="Register" />
+            <Label fx:id="connectionLabel" />
+            <CheckBox fx:id="offlineCheckBox" layoutX="20.0" layoutY="144.0" mnemonicParsing="false" prefHeight="17.0" prefWidth="181.0" text="Offline mode" />
 			</children>
 		</VBox>
 	</content>