SeedSigner main loop pseudocode to demonstrate changes in the Flow-based testing PR #339

Flow-based test pseudocode changes

Controller:
    create initial Destination (** configurable; MainMenuView by default)
    infinite while loop:
        next_destination.run()
        Destination.run():
            ** Destination._instantiate_view():
                instantiate View
            ** Destination._run_view():
                View.run():
                    do some setup
                    ** View.run_screen():
                        instantiate its Screen (may be a generic Screen, may be specific)
                        Screen.display():
                            (render the screen, listen for user input)
                            return the user's selection
                        return the user's selection
                    receives the user's selection
                    creates the next Destination
                    returns that Destination to its calling Destination (above).
                received the next Destination from the View.
            return next Destination to the Controller
        Controller receives its next_destination
        ** Check for StopFlowBasedTestCommand

Original main loop pseudocode.txt

Controller:
    create initial Destination (MainMenuView)
    infinite while loop:
        next_destination.run()
        Destination.run():  (view.py, line 96)
            insantiate View
            View.run():
                do some setup
                instantiate its Screen (may be a generic Screen, may be specific)
                Screen.display():
                    (render the screen, listen for user input)
                    return the user's selection
                receives the user's selection
                creates the next Destination
                returns that Destination to its calling Destination (above).
            received the next Destination from the View.
            return next Destination to the Controller
        Controller receives its next_destination