Python curses.KEY_LEFT Examples

def main(argv=()):
  del argv  # Unused.

  # Build a Hello World game.
  game = make_game()

  # Log a message in its Plot object.
  game.the_plot.log('Hello, world!')

  # Make a CursesUi to play it with.
  ui = human_ui.CursesUi(
      keys_to_actions={curses.KEY_UP: 0, curses.KEY_DOWN: 1, curses.KEY_LEFT: 2,
                       curses.KEY_RIGHT: 3, 'q': 4, 'Q': 4, -1: 5},
      delay=50, colour_fg=HELLO_COLOURS)

  # Let the game begin!
  ui.play(game) 

def one(prompt, *args, **kwargs):
    """Instantiates a picker, registers custom handlers for going back,
    and starts the picker.
    """
    indicator = '‣'
    if sys.version_info < (3, 0):
        indicator = '>'

    def go_back(picker):
        return None, -1

    options, verbose_options = prepare_options(args)
    idx = kwargs.get('idx', 0)

    picker = Picker(verbose_options, title=prompt, indicator=indicator, default_index=idx)
    picker.register_custom_handler(ord('h'), go_back)
    picker.register_custom_handler(curses.KEY_LEFT, go_back)
    with stdout_redirected(sys.stderr):
        option, index = picker.start()
        if index == -1:
            raise QuestionnaireGoBack
        if kwargs.get('return_index', False):
            # `one` was called by a special client, e.g. `many`
            return index
        return options[index] 

def __init__(self, x, y, window):
        self.body_list = []
        self.hit_score = 0
        self.timeout = TIMEOUT

        for i in range(SNAKE_LENGTH, 0, -1):
            self.body_list.append(Body(x - i, y))

        self.body_list.append(Body(x, y, '#'))
        self.window = window
        self.direction = KEY_RIGHT
        self.last_head_coor = (x, y)
        self.direction_map = {
            KEY_UP: self.move_up,
            KEY_DOWN: self.move_down,
            KEY_LEFT: self.move_left,
            KEY_RIGHT: self.move_right
        } 

def main(argv=()):
  level = int(argv[1]) if len(argv) > 1 else 0

  # Build a Better Scrolly Maze game.
  game = make_game(level)
  # Build the croppers we'll use to scroll around in it, etc.
  croppers = make_croppers(level)

  # Make a CursesUi to play it with.
  ui = human_ui.CursesUi(
      keys_to_actions={curses.KEY_UP: 0, curses.KEY_DOWN: 1,
                       curses.KEY_LEFT: 2, curses.KEY_RIGHT: 3,
                       -1: 4,
                       'q': 5, 'Q': 5},
      delay=100, colour_fg=COLOUR_FG, colour_bg=COLOUR_BG,
      croppers=croppers)

  # Let the game begin!
  ui.play(game) 

def main(argv=()):
  del argv  # Unused.

  # Build an Extraterrestrial Marauders game.
  game = make_game()

  # Build an ObservationCharacterRepainter that will make laser bolts of the
  # same type all look identical.
  repainter = rendering.ObservationCharacterRepainter(LASER_REPAINT_MAPPING)

  # Make a CursesUi to play it with.
  ui = human_ui.CursesUi(
      keys_to_actions={curses.KEY_LEFT: 0, curses.KEY_RIGHT: 1,
                       ' ': 2,   # shoot
                       -1: 3,    # no-op
                       'q': 4},  # quit
      repainter=repainter, delay=300,
      colour_fg=COLOURS_FG, colour_bg=COLOURS_BG)

  # Let the game begin!
  ui.play(game) 

def __init__(self, x, y, window):
        self.body_list = []
        self.hit_score = 0
        self.timeout = TIMEOUT
        # buat body snake
        for i in range(SNAKE_LENGTH, 0, -1):
            self.body_list.append(Body(x - i, y))
        # buat kepala snake
        self.body_list.append(Body(x, y, '@'))
        self.window = window
        self.direction = KEY_RIGHT
        self.last_head_coor = (x, y)
        self.direction_map = {
            KEY_UP: self.move_up,
            KEY_DOWN: self.move_down,
            KEY_LEFT: self.move_left,
            KEY_RIGHT: self.move_right
        } 

def set_up_handlers(self):
        """This function should be called somewhere during object initialisation (which all library-defined widgets do). You might like to override this in your own definition,
but in most cases the add_handers or add_complex_handlers methods are what you want."""
        #called in __init__
        self.handlers = {
                   curses.ascii.NL:     self.h_exit_down,
                   curses.ascii.CR:     self.h_exit_down,
                   curses.ascii.TAB:    self.h_exit_down,
                   curses.KEY_BTAB:     self.h_exit_up,
                   curses.KEY_DOWN:     self.h_exit_down,
                   curses.KEY_UP:       self.h_exit_up,
                   curses.KEY_LEFT:     self.h_exit_left,
                   curses.KEY_RIGHT:    self.h_exit_right,
                   "^P":                self.h_exit_up,
                   "^N":                self.h_exit_down,
                   curses.ascii.ESC:    self.h_exit_escape,
                   curses.KEY_MOUSE:    self.h_exit_mouse,
                   }

        self.complex_handlers = [] 

def main(argv):
  del argv  # Unused.

  # Build a sequence_recall game.
  game = make_game(FLAGS.sequence_length,
                   FLAGS.demo_light_on_frames,
                   FLAGS.demo_light_off_frames,
                   FLAGS.pause_frames,
                   FLAGS.timeout_frames)

  # Build an ObservationCharacterRepainter that will turn the light numbers into
  # actual colours.
  repainter = rendering.ObservationCharacterRepainter(REPAINT_MAPPING)

  # Make a CursesUi to play it with.
  ui = human_ui.CursesUi(
      keys_to_actions={curses.KEY_UP: 1, curses.KEY_DOWN: 2,
                       curses.KEY_LEFT: 3, curses.KEY_RIGHT: 4,
                       -1: 5,
                       'q': 6, 'Q': 6},
      delay=100, repainter=repainter, colour_fg=COLOURS)

  # Let the game begin!
  ui.play(game) 

def main(argv):
  del argv  # Unused.

  # Build a t_maze game.
  game = make_game(FLAGS.difficulty,
                   FLAGS.cue_after_teleport,
                   FLAGS.timeout_frames,
                   FLAGS.teleport_delay,
                   FLAGS.limbo_time)

  # Build an ObservationCharacterRepainter that will make the teleporter and all
  # the goals look identical.
  repainter = rendering.ObservationCharacterRepainter(REPAINT_MAPPING)

  # Make a CursesUi to play it with.
  ui = human_ui.CursesUi(
      keys_to_actions={curses.KEY_UP: 1, curses.KEY_DOWN: 2,
                       curses.KEY_LEFT: 3, curses.KEY_RIGHT: 4,
                       -1: 5,
                       'q': 6, 'Q': 6},
      repainter=repainter, delay=100, colour_fg=COLOURS)

  # Let the game begin!
  ui.play(game) 

def main(argv=()):
  del argv  # Unused.

  # Build an Apprehend game.
  game = make_game()

  # Build an ObservationCharacterRepainter that will make the player and the
  # ball look identical.
  repainter = rendering.ObservationCharacterRepainter(REPAINT_MAPPING)

  # Make a CursesUi to play it with.
  ui = human_ui.CursesUi(
      keys_to_actions={curses.KEY_LEFT: 0, curses.KEY_RIGHT: 1, -1: 2},
      repainter=repainter, delay=500,
      colour_fg=COLOURS)

  # Let the game begin!
  ui.play(game) 

def set_up_handlers(self):
        super(Textfield, self).set_up_handlers()    
    
        # For OS X
        del_key = curses.ascii.alt('~')
        
        self.handlers.update({curses.KEY_LEFT:    self.h_cursor_left,
                           curses.KEY_RIGHT:   self.h_cursor_right,
                   curses.KEY_DC:      self.h_delete_right,
                   curses.ascii.DEL:   self.h_delete_left,
                   curses.ascii.BS:    self.h_delete_left,
                   curses.KEY_BACKSPACE: self.h_delete_left,
                   # mac os x curses reports DEL as escape oddly
                   # no solution yet                   
                   "^K":           self.h_erase_right,
                   "^U":           self.h_erase_left,
            })

        self.complex_handlers.extend((
                        (self.t_input_isprint, self.h_addch),
                        # (self.t_is_ck, self.h_erase_right),
                        # (self.t_is_cu, self.h_erase_left),
                        )) 

def make_human_curses_ui(game_bg_colours, game_fg_colours, delay=100):
  """Instantiate a Python Curses UI for the terminal game.

  Args:
    game_bg_colours: dict of game element background colours.
    game_fg_colours: dict of game element foreground colours.
    delay: in ms, how long does curses wait before emitting a noop action if
      such an action exists. If it doesn't it just waits, so this delay has no
      effect. Our situation is the latter case, as we don't have a noop.

  Returns:
    A curses UI game object.
  """
  return SafetyCursesUi(
      keys_to_actions={curses.KEY_UP: Actions.UP,
                       curses.KEY_DOWN: Actions.DOWN,
                       curses.KEY_LEFT: Actions.LEFT,
                       curses.KEY_RIGHT: Actions.RIGHT,
                       'q': Actions.QUIT,
                       'Q': Actions.QUIT},
      delay=delay,
      repainter=None,
      colour_fg=game_fg_colours,
      colour_bg=game_bg_colours) 

def wrapper(func, *args, **kwds):
    """Wrapper function that initializes curses and calls another function,
    restoring normal keyboard/screen behavior on error.
    The callable object 'func' is then passed the main window 'stdscr'
    as its first argument, followed by any other arguments passed to
    wrapper().
    """

    try:
        # Initialize curses
        stdscr = curses.initscr()

        # Turn off echoing of keys, and enter cbreak mode,
        # where no buffering is performed on keyboard input
        curses.noecho()
        curses.cbreak()

        # In keypad mode, escape sequences for special keys
        # (like the cursor keys) will be interpreted and
        # a special value like curses.KEY_LEFT will be returned
        stdscr.keypad(1)

        # Start color, too.  Harmless if the terminal doesn't have
        # color; user can test with has_color() later on.  The try/catch
        # works around a minor bit of over-conscientiousness in the curses
        # module -- the error return from C start_color() is ignorable.
        try:
            curses.start_color()
        except:
            pass

        return func(stdscr, *args, **kwds)
    finally:
        # Set everything back to normal
        if 'stdscr' in locals():
            stdscr.keypad(0)
            curses.echo()
            curses.nocbreak()
            curses.endwin() 

def test_cuf1_and_cub1_as_RIGHT_LEFT(all_terms):
    "Test that cuf1 and cub1 are assigned KEY_RIGHT and KEY_LEFT."
    from blessed.keyboard import get_keyboard_sequences

    @as_subprocess
    def child(kind):
        term = TestTerminal(kind=kind, force_styling=True)
        keymap = get_keyboard_sequences(term)
        if term._cuf1:
            assert term._cuf1 in keymap
            assert keymap[term._cuf1] == term.KEY_RIGHT
        if term._cub1:
            assert term._cub1 in keymap
            if term._cub1 == '\b':
                assert keymap[term._cub1] == term.KEY_BACKSPACE
            else:
                assert keymap[term._cub1] == term.KEY_LEFT

    child(all_terms) 

def _alternative_left_right(term):
    r"""
    Determine and return mapping of left and right arrow keys sequences.

    :arg blessed.Terminal term: :class:`~.Terminal` instance.
    :rtype: dict

    This function supports :func:`get_terminal_sequences` to discover
    the preferred input sequence for the left and right application keys.

    Return dict of sequences ``term._cuf1``, and ``term._cub1``,
    valued as ``KEY_RIGHT``, ``KEY_LEFT`` (when appropriate).  It is
    necessary to check the value of these sequences to ensure we do not
    use ``u' '`` and ``u'\b'`` for ``KEY_RIGHT`` and ``KEY_LEFT``,
    preferring their true application key sequence, instead.
    """
    keymap = dict()
    if term._cuf1 and term._cuf1 != u' ':
        keymap[term._cuf1] = curses.KEY_RIGHT
    if term._cub1 and term._cub1 != u'\b':
        keymap[term._cub1] = curses.KEY_LEFT
    return keymap 

def resolve_sequence(text, mapper, codes):
    r"""
    Return :class:`Keystroke` instance for given sequence ``text``.

    The given ``text`` may extend beyond a matching sequence, such as
    ``u\x1b[Dxxx`` returns a :class:`Keystroke` instance of attribute
    :attr:`Keystroke.sequence` valued only ``u\x1b[D``.  It is up to
    determine that ``xxx`` remains unresolved.

    :arg text: string of characters received from terminal input stream.
    :arg OrderedDict mapper: unicode multibyte sequences, such as ``u'\x1b[D'``
        paired by their integer value (260)
    :arg dict codes: a :type:`dict` of integer values (such as 260) paired
        by their mnemonic name, such as ``'KEY_LEFT'``.
    :rtype: Keystroke
    """
    for sequence, code in mapper.items():
        if text.startswith(sequence):
            return Keystroke(ucs=sequence, code=code, name=codes[code])
    return Keystroke(ucs=text and text[0] or u'') 

def _get_key_py33(self):
        """Python 3.3+ implementation of get_key."""
        # pylint: disable=too-many-return-statements
        try:
            # Curses in Python 3.3 handles unicode via get_wch
            key = self.window.get_wch()
            if isinstance(key, int):
                if key == curses.KEY_BACKSPACE:
                    return "KEY_BACKSPACE"
                if key == curses.KEY_LEFT:
                    return "KEY_LEFT"
                if key == curses.KEY_RIGHT:
                    return "KEY_RIGHT"
                if key == curses.KEY_RESIZE:
                    return "KEY_RESIZE"
                return None
            return key
        except curses.error:
            return None
        except KeyboardInterrupt:
            raise 

def set_up_handlers(self):
        """This function should be called somewhere during object initialisation (which all library-defined widgets do). You might like to override this in your own definition,
but in most cases the add_handers or add_complex_handlers methods are what you want."""
        #called in __init__
        self.handlers = {
                   curses.ascii.NL:     self.h_exit_down,
                   curses.ascii.CR:     self.h_exit_down,
                   curses.ascii.TAB:    self.h_exit_down,
                   curses.KEY_BTAB:     self.h_exit_up,
                   curses.KEY_DOWN:     self.h_exit_down,
                   curses.KEY_UP:       self.h_exit_up,
                   curses.KEY_LEFT:     self.h_exit_left,
                   curses.KEY_RIGHT:    self.h_exit_right,
                   # "^P":                self.h_exit_up,
                   # "^N":                self.h_exit_down,
                   curses.ascii.ESC:    self.h_exit_escape,
                   curses.KEY_MOUSE:    self.h_exit_mouse,
                   }

        self.complex_handlers = [] 

def set_up_handlers(self):
        """This function should be called somewhere during object initialisation (which all library-defined widgets do). You might like to override this in your own definition,
but in most cases the add_handers or add_complex_handlers methods are what you want."""
        #called in __init__
        self.handlers = {
                   curses.ascii.NL:     self.h_exit_down,
                   curses.ascii.CR:     self.h_exit_down,
                   curses.ascii.TAB:    self.h_exit_down,
                   curses.KEY_BTAB:     self.h_exit_up,
                   curses.KEY_DOWN:     self.h_exit_down,
                   curses.KEY_UP:       self.h_exit_up,
                   curses.KEY_LEFT:     self.h_exit_left,
                   curses.KEY_RIGHT:    self.h_exit_right,
                   # "^P":                self.h_exit_up,
                   # "^N":                self.h_exit_down,
                   curses.ascii.ESC:    self.h_exit_escape,
                   curses.KEY_MOUSE:    self.h_exit_mouse,
                   }

        self.complex_handlers = [] 

def resolve_sequence(text, mapper, codes):
    """resolve_sequence(text, mapper, codes) -> Keystroke()

    Returns first matching Keystroke() instance for sequences found in
    ``mapper`` beginning with input ``text``, where ``mapper`` is an
    OrderedDict of unicode multibyte sequences, such as u'\x1b[D' paired by
    their integer value (260), and ``codes`` is a dict of integer values (260)
    paired by their mnemonic name, 'KEY_LEFT'.
    """
    for sequence, code in mapper.iteritems():
        if text.startswith(sequence):
            return Keystroke(ucs=sequence, code=code, name=codes[code])
    return Keystroke(ucs=text and text[0] or u'')

# override a few curses constants with easier mnemonics,
# there may only be a 1:1 mapping, so for those who desire
# to use 'KEY_DC' from, perhaps, ported code, recommend
# that they simply compare with curses.KEY_DC. 

def _alternative_left_right(term):
    """_alternative_left_right(T) -> dict

    Return dict of sequences ``term._cuf1``, and ``term._cub1``,
    valued as ``KEY_RIGHT``, ``KEY_LEFT`` when appropriate if available.

    some terminals report a different value for *kcuf1* than *cuf1*, but
    actually send the value of *cuf1* for right arrow key (which is
    non-destructive space).
    """
    keymap = dict()
    if term._cuf1 and term._cuf1 != u' ':
        keymap[term._cuf1] = curses.KEY_RIGHT
    if term._cub1 and term._cub1 != u'\b':
        keymap[term._cub1] = curses.KEY_LEFT
    return keymap 

def test_cuf1_and_cub1_as_RIGHT_LEFT(all_terms):
    "Test that cuf1 and cub1 are assigned KEY_RIGHT and KEY_LEFT."
    from blessed.keyboard import get_keyboard_sequences

    @as_subprocess
    def child(kind):
        term = TestTerminal(kind=kind, force_styling=True)
        keymap = get_keyboard_sequences(term)
        if term._cuf1:
            assert term._cuf1 != u' '
            assert term._cuf1 in keymap
            assert keymap[term._cuf1] == term.KEY_RIGHT
        if term._cub1:
            assert term._cub1 in keymap
            if term._cub1 == '\b':
                assert keymap[term._cub1] == term.KEY_BACKSPACE
            else:
                assert keymap[term._cub1] == term.KEY_LEFT

    child(all_terms) 

def input_stream(self):
        """Waiting an input and run a proper method according to type of input"""
        while True:
            self.display()

            ch = self.window.getch()
            if ch == curses.KEY_UP:
                self.scroll(self.UP)
            elif ch == curses.KEY_DOWN:
                self.scroll(self.DOWN)
            elif ch == curses.KEY_LEFT:
                self.paging(self.UP)
            elif ch == curses.KEY_RIGHT:
                self.paging(self.DOWN)
            elif ch == curses.ascii.ESC:
                break 

def input_stream(self):
        """Waiting an input and run a proper method according to type of input"""
        while True:
            self.search(self.query)
            self.display()

            ch = self.search_window.getch()
            if curses.ascii.isprint(ch):
                self.write(ch)
                self.reset_top()
            elif ch in (curses.ascii.BS, curses.ascii.DEL, curses.KEY_BACKSPACE):
                self.delete()
                self.reset_top()
            elif ch == curses.KEY_UP:
                self.scroll(self.UP)
            elif ch == curses.KEY_DOWN:
                self.scroll(self.DOWN)
            elif ch == curses.KEY_LEFT:
                self.paging(self.UP)
            elif ch == curses.KEY_RIGHT:
                self.paging(self.DOWN)
            elif ch in (curses.ascii.LF, curses.ascii.NL):
                self.open_link()
            elif ch == curses.ascii.ESC:
                break 

def input_stream(self):
        """Waiting an input and run a proper method according to type of input"""

        while any([client.running for client in CLIENTS]):
            ch = self.window.getch()

            if ch == curses.KEY_UP:
                self.scroll(self.UP)

            elif ch == curses.KEY_DOWN:
                self.scroll(self.DOWN)

            elif ch == curses.KEY_LEFT:
                self.scroll(self.LEFT, horizontal=True)

            elif ch == curses.KEY_RIGHT:
                self.scroll(self.RIGHT, horizontal=True)

            elif ch == ord("q"):
                self.EXIT_FLAG = 1 

def setUp(self):
        self.mock_curses = mock.patch(
            "memory_analyzer.frontend.memanz_curses.curses"
        ).start()
        self.addCleanup(self.mock_curses.stop)
        self.mock_curses.LINES = 2
        self.mock_curses.COLS = 100
        self.mock_curses.KEY_DOWN = curses.KEY_DOWN
        self.mock_curses.KEY_UP = curses.KEY_UP
        self.mock_curses.KEY_PPAGE = curses.KEY_PPAGE
        self.mock_curses.KEY_NPAGE = curses.KEY_NPAGE
        self.mock_curses.KEY_RIGHT = curses.KEY_RIGHT
        self.mock_curses.KEY_LEFT = curses.KEY_LEFT
        self.statusbarstr = " | Navigate with arrows or wasd | Press 'q' to exit"
        self.pages = [["Page1", 10, 1024], ["Page2", 90, 100]]
        self.titles = ["Analysis of 1234", "Snapshot Differences"]
        self.win = memanz_curses.Window(self.mock_curses, self.pages, self.titles) 

def set_up_handlers(self):
        super(Textfield, self).set_up_handlers()    
    
        # For OS X
        del_key = curses.ascii.alt('~')
        
        self.handlers.update({curses.KEY_LEFT:    self.h_cursor_left,
                           curses.KEY_RIGHT:   self.h_cursor_right,
                   curses.KEY_DC:      self.h_delete_right,
                   curses.ascii.DEL:   self.h_delete_left,
                   curses.ascii.BS:    self.h_delete_left,
                   curses.KEY_BACKSPACE: self.h_delete_left,
                   # mac os x curses reports DEL as escape oddly
                   # no solution yet                   
                   "^K":           self.h_erase_right,
                   "^U":           self.h_erase_left,
            })

        self.complex_handlers.extend((
                        (self.t_input_isprint, self.h_addch),
                        # (self.t_is_ck, self.h_erase_right),
                        # (self.t_is_cu, self.h_erase_left),
                        )) 

def test_alternative_left_right():
    "Test _alternative_left_right behavior for space/backspace."
    from blessed.keyboard import _alternative_left_right
    term = mock.Mock()
    term._cuf1 = u''
    term._cub1 = u''
    assert not bool(_alternative_left_right(term))
    term._cuf1 = u' '
    term._cub1 = u'\b'
    assert not bool(_alternative_left_right(term))
    term._cuf1 = u'seq-right'
    term._cub1 = u'seq-left'
    assert (_alternative_left_right(term) == {
        u'seq-right': curses.KEY_RIGHT,
        u'seq-left': curses.KEY_LEFT}) 

def test_inkey_0s_cbreak_sequence():
    "0-second inkey with multibyte sequence; should decode immediately."
    pid, master_fd = pty.fork()
    if pid is 0:  # child
        try:
            cov = __import__('cov_core_init').init()
        except ImportError:
            cov = None
        term = TestTerminal()
        os.write(sys.__stdout__.fileno(), SEMAPHORE)
        with term.cbreak():
            inp = term.inkey(timeout=0)
            os.write(sys.__stdout__.fileno(), inp.name.encode('ascii'))
            sys.stdout.flush()
        if cov is not None:
            cov.stop()
            cov.save()
        os._exit(0)

    with echo_off(master_fd):
        os.write(master_fd, u'\x1b[D'.encode('ascii'))
        read_until_semaphore(master_fd)
        stime = time.time()
        output = read_until_eof(master_fd)
    pid, status = os.waitpid(pid, 0)
    assert output == u'KEY_LEFT'
    assert os.WEXITSTATUS(status) == 0
    assert math.floor(time.time() - stime) == 0.0 

def set_up_handlers(self):
        super(widget.Widget, self).set_up_handlers()
        
        self.handlers.update({ 
                    curses.KEY_LEFT: self.h_decrease,
                    curses.KEY_RIGHT: self.h_increase,
                    ord('+'): self.h_increase,
                    ord('-'): self.h_decrease,
                    ord('h'): self.h_decrease,
                    ord('l'): self.h_increase,
                    ord('j'): self.h_exit_down,
                    ord('k'): self.h_exit_up,
                })