Formatting

* Split applyTheme method in applyTheme and autoscroll.
* Added Javadoc

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

@@ -250,6 +250,7 @@ public class ChatWindow extends JFrame {
 		messageList.setBackground(theme.getCellColor());
 		// scrollPane
 		scrollPane.applyTheme(theme);
+		scrollPane.autoscroll();
 
 		// messageEnterTextArea
 		messageEnterTextArea.setCaretColor(theme.getTypingMessageColor());

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

@@ -8,6 +8,7 @@ import javax.swing.JScrollPane;
  * Created: <strong>15 Dec 2019</strong><br>
  *
  * @author Kai S. K. Engelbart
+ * @author Maximilian K&auml;fer
  */
 public class PrimaryScrollPane extends JScrollPane {
 
@@ -18,6 +19,12 @@ public class PrimaryScrollPane extends JScrollPane {
 
 	public PrimaryScrollPane() { setBorder(null); }
 
+	/**
+	 * Styles the vertical and horizontal scroll bars.
+	 * 
+	 * @param theme
+	 * @since Envoy v0.2-alpha
+	 */
 	public void applyTheme(Theme theme) {
 		setForeground(theme.getBackgroundColor());
 		setBackground(theme.getCellColor());
@@ -26,7 +33,22 @@ public class PrimaryScrollPane extends JScrollPane {
 		getVerticalScrollBar().setUI(new PrimaryScrollBar(theme, true));
 		getHorizontalScrollBar().setBackground(theme.getCellColor());
 		getHorizontalScrollBar().setUI(new PrimaryScrollBar(theme, false));
+	}
 
+	/**
+	 * Implements <b>autoscroll functionality</b> for the vertical scroll bar. </br>
+	 * </br>
+	 * Functionality to automatically scroll down when user views </br>
+	 * the bottom of the chat while there are new messages added. </br>
+	 * </br>
+	 * When chat is opened, the vertical scroll bar starts at the bottom. </br>
+	 * </br>
+	 * When rereading messages, the chat doesn't scroll down if new messages </br>
+	 * are added. (Besides see first point)
+	 * 
+	 * @since Envoy v0.2-alpha
+	 */
+	public void autoscroll() {
 		// Automatic scrolling to the bottom
 		getVerticalScrollBar().addAdjustmentListener(e -> {
 			if (verticalScrollBarMaximum == e.getAdjustable().getMaximum()) return;