Set up basic UI

src/main/java/org/openautonomousconnection/webclient/ui/TopBar.java

@@ -0,0 +1,82 @@
+/* Author: Maple
+ *  Jan. 18 2026
+ *  */
+
+package org.openautonomousconnection.webclient.ui;
+
+import lombok.Getter;
+import org.openautonomousconnection.webclient.Main;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionAdapter;
+
+public class TopBar extends JPanel {
+    @Getter
+    private MenuButton closeButton, minimizeButton, maximizeButton;
+
+    @Getter
+    private JPanel buttonPanel;
+
+    private Point dragOffset;
+
+    public TopBar() {
+        this.setPreferredSize(new Dimension(0, 40));
+
+        this.buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
+
+        this.closeButton = new MenuButton("X", MenuButton.ClickAction.CLOSE);
+        this.minimizeButton = new MenuButton("-", MenuButton.ClickAction.MINIMIZE);
+        this.maximizeButton = new MenuButton("[]", MenuButton.ClickAction.MAXIMIZE);
+
+        this.buttonPanel.add(this.closeButton);
+        this.buttonPanel.add(this.minimizeButton);
+        this.buttonPanel.add(this.maximizeButton);
+
+        this.init();
+    }
+
+    private void init() {
+        this.addMouseListener(new MouseAdapter() {
+            @Override
+            public void mousePressed(MouseEvent e) {
+                Point mouseOnScreen = e.getLocationOnScreen();
+                Point frameLocation = Main.mainFrame.getLocation();
+
+                dragOffset = new Point(
+                        mouseOnScreen.x - frameLocation.x,
+                        mouseOnScreen.y - frameLocation.y
+                );
+            }
+
+            @Override
+            public void mouseReleased(MouseEvent e) {
+                dragOffset = null;
+            }
+        });
+
+        this.addMouseMotionListener(new MouseMotionAdapter() {
+            @Override
+            public void mouseDragged(MouseEvent e) {
+                if (dragOffset != null) {
+                    Point mouseOnScreen = e.getLocationOnScreen();
+
+                    int newX = mouseOnScreen.x - dragOffset.x;
+                    int newY = mouseOnScreen.y - dragOffset.y;
+
+                    Main.mainFrame.setLocation(newX, newY);
+                }
+            }
+        });
+    }
+
+    public void initButtonPanel(String alignment) {
+        this.setLayout(new BorderLayout());
+
+        this.add(this.buttonPanel, alignment);
+
+        this.repaint();
+    }
+}