code: def __update_mouse(self, milliseconds):
          
          for button in self.gui_buttons:
              was_hovering = button.is_mouse_hovering
              button.update(milliseconds)
  
              #Provides capibilities for the mouse to select a button if the mouse is the focus of input.
              if was_hovering == False and button.is_mouse_hovering:
                  #The user has just moved the mouse over the button. Set it as active.
                  old_index = self.current_index
                  self.current_index = self.gui_buttons.index(button)
                  self.__handle_selections(old_index, self.current_index)
              elif Ragnarok.get_world().Mouse.is_clicked(self.mouse_select_button) and button.is_mouse_hovering:
                  #The main mouse button has just depressed, click the current button.
                  button.clicked_action()
docs: Use the mouse to control selection of the buttons.