Moved system tray logic to StatusTrayIcon class

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

@@ -1,17 +1,11 @@
 package envoy.client.ui;
 
-import java.awt.AWTException;
 import java.awt.Color;
 import java.awt.ComponentOrientation;
 import java.awt.Font;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
-import java.awt.Image;
 import java.awt.Insets;
-import java.awt.SystemTray;
-import java.awt.Toolkit;
-import java.awt.TrayIcon;
-import java.awt.TrayIcon.MessageType;
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.WindowAdapter;
@@ -128,8 +122,8 @@ public class ChatWindow extends JFrame {
 
 			@Override
 			public void keyReleased(KeyEvent e) {
-				if (e.getKeyCode() == KeyEvent.VK_ENTER && ((SettingsScreen.enterToSend && e.getModifiersEx() == 0)
-						|| (e.getModifiersEx() == KeyEvent.CTRL_DOWN_MASK))) {
+				if (e.getKeyCode() == KeyEvent.VK_ENTER
+						&& ((SettingsScreen.enterToSend && e.getModifiersEx() == 0) || (e.getModifiersEx() == KeyEvent.CTRL_DOWN_MASK))) {
 
 					postMessage(messageList);
 				}
@@ -220,11 +214,7 @@ public class ChatWindow extends JFrame {
 				final User			user				= selectedUserList.getSelectedValue();
 				client.setRecipient(user);
 
-				currentChat = localDB.getChats()
-					.stream()
-					.filter(chat -> chat.getRecipient().getID() == user.getID())
-					.findFirst()
-					.get();
+				currentChat = localDB.getChats().stream().filter(chat -> chat.getRecipient().getID() == user.getID()).findFirst().get();
 
 				// Set all unread messages in the chat to read
 				readCurrentChat();
@@ -263,10 +253,7 @@ public class ChatWindow extends JFrame {
 
 	private void postMessage(JList<Message> messageList) {
 		if (!client.hasRecipient()) {
-			JOptionPane.showMessageDialog(this,
-					"Please select a recipient!",
-					"Cannot send message",
-					JOptionPane.INFORMATION_MESSAGE);
+			JOptionPane.showMessageDialog(this, "Please select a recipient!", "Cannot send message", JOptionPane.INFORMATION_MESSAGE);
 		}
 
 		if (!messageEnterTextArea.getText().isEmpty()) try {
@@ -322,8 +309,7 @@ public class ChatWindow extends JFrame {
 			new Thread(() -> {
 
 				// Synchronize
-				localDB.applySync(
-						client.sendSync(client.getSender().getID(), localDB.fillSync(client.getSender().getID())));
+				localDB.applySync(client.sendSync(client.getSender().getID(), localDB.fillSync(client.getSender().getID())));
 
 				// Process unread messages
 				localDB.addUnreadMessagesToLocalDB();
@@ -333,8 +319,7 @@ public class ChatWindow extends JFrame {
 				readCurrentChat();
 
 				// Update UI
-				SwingUtilities
-					.invokeLater(() -> { updateUserStates(); contentPane.revalidate(); contentPane.repaint(); });
+				SwingUtilities.invokeLater(() -> { updateUserStates(); contentPane.revalidate(); contentPane.repaint(); });
 			}).start();
 		}).start();
 	}
@@ -350,14 +335,4 @@ public class ChatWindow extends JFrame {
 	 * Marks messages in the current chat as {@code READ}.
 	 */
 	private void readCurrentChat() { if (currentChat != null) { localDB.setMessagesToRead(currentChat); } }
-
-	private void displayNotification(String message) throws AWTException {
-		SystemTray	tray		= SystemTray.getSystemTray();
-		Image		image		= Toolkit.getDefaultToolkit().createImage(getClass().getResource("Envoy Logo.png"));
-		TrayIcon	trayIcon	= new TrayIcon(image, "Envoy Client");
-		trayIcon.setImageAutoSize(true);
-		trayIcon.setToolTip("You are notified if you have unread messages.");
-		tray.add(trayIcon);
-		trayIcon.displayMessage("Envoy Client", message, MessageType.INFO);
-	}
 }

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

@@ -0,0 +1,39 @@
+package envoy.client.ui;
+
+import java.awt.AWTException;
+import java.awt.Image;
+import java.awt.SystemTray;
+import java.awt.Toolkit;
+import java.awt.TrayIcon;
+
+import envoy.exception.EnvoyException;
+
+/**
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>StatusTrayIcon.java</strong><br>
+ * Created: <strong>3 Dec 2019</strong><br>
+ *
+ * @author Kai S. K. Engelbart
+ * @since Envoy v0.2-alpha
+ */
+public class StatusTrayIcon {
+
+	private TrayIcon trayIcon;
+
+	public StatusTrayIcon() throws EnvoyException {
+		if (!SystemTray.isSupported()) throw new EnvoyException("The Envoy tray icon is not supported.");
+
+		Image		img			= Toolkit.getDefaultToolkit().createImage(getClass().getResource("envoy_logo.png"));
+		TrayIcon	trayIcon	= new TrayIcon(img, "Envoy Client");
+		trayIcon.setImageAutoSize(true);
+		trayIcon.setToolTip("You are notified if you have unread messages.");
+		try {
+			SystemTray.getSystemTray().add(trayIcon);
+		} catch (AWTException e) {
+			throw new EnvoyException("Could not attach Envoy tray icon to system tray.", e);
+		}
+	}
+
+	// TODO: Add event listener
+	// trayIcon.displayMessage("Envoy Client", message, MessageType.INFO);
+}