Feat: Add 'Close File' option to menu to unload current file

src/teletext/ui.py

@@ -111,6 +111,12 @@ class MainWindow(QMainWindow):
         save_action.triggered.connect(self.save_file)
         file_menu.addAction(save_action)
         
+        close_action = QAction("Close File", self)
+        close_action.triggered.connect(self.close_file)
+        file_menu.addAction(close_action)
+        
+        file_menu.addSeparator()
+        
         exit_action = QAction("Exit", self)
         exit_action.triggered.connect(self.close)
         file_menu.addAction(exit_action)
@@ -133,6 +139,19 @@ class MainWindow(QMainWindow):
             self.canvas.redraw()
             self.canvas.update()
 
+    def close_file(self):
+        # Reset everything
+        self.service = TeletextService()
+        self.current_page = None
+        self.populate_list()
+        self.subpage_combo.clear()
+        self.page_groups = {}
+        # Clear canvas
+        self.canvas.set_page(None)
+        # Maybe reset text of hex input
+        self.hex_input.clear()
+        QMessageBox.information(self, "Closed", "File closed.")
+
     def open_file(self):
         fname, _ = QFileDialog.getOpenFileName(self, "Open T42", "", "Teletext Files (*.t42);;All Files (*)")
         if fname:
@@ -248,8 +267,8 @@ class MainWindow(QMainWindow):
             self.canvas.move_cursor(0, 1)
         else:
             # Typing
-            # Filter non-printable
-            if text and len(text) == 1 and 32 <= ord(text) <= 126:
+            # Allow wider range of chars for national support
+            if text and len(text) == 1 and ord(text) >= 32:
                 self.canvas.handle_input(text)
             elif key == Qt.Key.Key_Backspace:
                 # Move back and delete