Feat: Add Prev/Next subpage navigation buttons

src/teletext/ui.py

@@ -61,8 +61,19 @@ class MainWindow(QMainWindow):
         self.subpage_combo = QComboBox()
         self.subpage_combo.setMinimumWidth(250)
         self.subpage_combo.currentIndexChanged.connect(self.on_subpage_changed)
+        
+        self.btn_prev_sub = QPushButton("<")
+        self.btn_prev_sub.setFixedWidth(30)
+        self.btn_prev_sub.clicked.connect(self.prev_subpage)
+        
+        self.btn_next_sub = QPushButton(">")
+        self.btn_next_sub.setFixedWidth(30)
+        self.btn_next_sub.clicked.connect(self.next_subpage)
+        
         top_bar.addWidget(self.subpage_label)
+        top_bar.addWidget(self.btn_prev_sub)
         top_bar.addWidget(self.subpage_combo)
+        top_bar.addWidget(self.btn_next_sub)
         top_bar.addStretch()
         
         center_layout.addLayout(top_bar)
@@ -139,6 +150,22 @@ class MainWindow(QMainWindow):
             self.canvas.redraw()
             self.canvas.update()
 
+    def prev_subpage(self):
+        count = self.subpage_combo.count()
+        if count <= 1: return
+        
+        current = self.subpage_combo.currentIndex()
+        new_index = (current - 1) % count
+        self.subpage_combo.setCurrentIndex(new_index)
+
+    def next_subpage(self):
+        count = self.subpage_combo.count()
+        if count <= 1: return
+        
+        current = self.subpage_combo.currentIndex()
+        new_index = (current + 1) % count
+        self.subpage_combo.setCurrentIndex(new_index)
+
     def close_file(self):
         # Reset everything
         self.service = TeletextService()