Added several improvements XXVIII

src/main/java/rvc/timecalc/AnalogClock.java

@@ -10,6 +10,8 @@ import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.RenderingHints;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
 
@@ -29,6 +31,33 @@ public class AnalogClock extends JPanel {
         setPreferredSize(new Dimension(400, 300));
         setBackground(BACKGROUND_COLOR);
         new Timer(1000, e -> repaint()).start();
+
+        addMouseListener(new MouseListener() {
+            @Override
+            public void mouseClicked(MouseEvent e) {
+                highlight = !highlight;
+            }
+
+            @Override
+            public void mousePressed(MouseEvent e) {
+
+            }
+
+            @Override
+            public void mouseReleased(MouseEvent e) {
+
+            }
+
+            @Override
+            public void mouseEntered(MouseEvent e) {
+
+            }
+
+            @Override
+            public void mouseExited(MouseEvent e) {
+
+            }
+        });
     }
 
     @Override

src/main/java/rvc/timecalc/TimeCalcWindow.java

@@ -7,6 +7,8 @@ import javax.swing.JFrame;
 import javax.swing.JTextPane;
 import java.awt.Color;
 import java.awt.Font;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
 import java.awt.image.BufferedImage;
 import java.io.ByteArrayInputStream;
 import java.text.DecimalFormat;