feat(io): SwingIO.choose renders the menu as buttons

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/SwingIO.java

@@ -10,7 +10,11 @@ import thb.jeanluc.adventure.io.text.StyledText;
 
 import javax.swing.AbstractAction;
 import javax.swing.BorderFactory;
+import javax.swing.Box;
+import javax.swing.BoxLayout;
+import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JDialog;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
@@ -342,6 +346,51 @@ public class SwingIO implements GameIO {
         // The GUI map panel is always visible; nothing extra to do on the 'map' command.
     }
 
+    @Override
+    public int choose(String title, List<String> options) {
+        // Same EDT↔worker handoff as readLine: the worker blocks on take(),
+        // the EDT (button click / window close) offers the chosen index.
+        LinkedBlockingQueue<Integer> picked = new LinkedBlockingQueue<>();
+        SwingUtilities.invokeLater(() -> {
+            JDialog dialog = new JDialog(frame, title, true);
+            JPanel panel = new JPanel();
+            panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
+            panel.setBorder(BorderFactory.createEmptyBorder(12, 12, 12, 12));
+            panel.add(new JLabel(title));
+            panel.add(Box.createVerticalStrut(8));
+            for (int i = 0; i < options.size(); i++) {
+                int idx = i;
+                JButton b = new JButton(options.get(i));
+                b.setAlignmentX(0f);
+                b.addActionListener(e -> {
+                    dialog.dispose();
+                    picked.offer(idx);
+                });
+                panel.add(b);
+                panel.add(Box.createVerticalStrut(4));
+            }
+            // Closing the dialog counts as the last (safe/cancel) option.
+            dialog.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
+            dialog.addWindowListener(new java.awt.event.WindowAdapter() {
+                @Override
+                public void windowClosing(java.awt.event.WindowEvent e) {
+                    dialog.dispose();
+                    picked.offer(options.size() - 1);
+                }
+            });
+            dialog.setContentPane(panel);
+            dialog.pack();
+            dialog.setLocationRelativeTo(frame);
+            dialog.setVisible(true);
+        });
+        try {
+            return picked.take();
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            return options.size() - 1;
+        }
+    }
+
     private void addList(List<Span> spans, List<String> xs, Style st) {
         for (int i = 0; i < xs.size(); i++) {
             if (i > 0) {