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name : display.py
 from typing import Dict, List, Optional, Tuple

from pyvirtualdisplay.xephyr import XephyrDisplay
from pyvirtualdisplay.xvfb import XvfbDisplay
from pyvirtualdisplay.xvnc import XvncDisplay

_class_map = {"xvfb": XvfbDisplay, "xvnc": XvncDisplay, "xephyr": XephyrDisplay}


class Display(object):
    """
    Proxy class

    :param color_depth: [8, 16, 24, 32]
    :param size: screen size (width,height)
    :param bgcolor: background color ['black' or 'white']
    :param visible: True -> Xephyr, False -> Xvfb
    :param backend: 'xvfb', 'xvnc' or 'xephyr', ignores ``visible``
    :param xauth: If a Xauthority file should be created.
    :param manage_global_env: if True then $DISPLAY is set in os.environ
        which is not thread-safe. Use False to make it thread-safe.
    """

    def __init__(
        self,
        backend: Optional[str] = None,
        visible: bool = False,
        size: Tuple[int, int] = (1024, 768),
        color_depth: int = 24,
        bgcolor: str = "black",
        use_xauth: bool = False,
        # check_startup=False,
        retries: int = 10,
        extra_args: List[str] = [],
        manage_global_env: bool = True,
        **kwargs
    ):
        self._color_depth = color_depth
        self._size = size
        self._bgcolor = bgcolor
        self._visible = visible
        self._backend = backend

        if not self._backend:
            if self._visible:
                self._backend = "xephyr"
            else:
                self._backend = "xvfb"

        cls = _class_map.get(self._backend)
        if not cls:
            raise ValueError("unknown backend: %s" % self._backend)

        self._obj = cls(
            size=size,
            color_depth=color_depth,
            bgcolor=bgcolor,
            retries=retries,
            use_xauth=use_xauth,
            # check_startup=check_startup,
            extra_args=extra_args,
            manage_global_env=manage_global_env,
            **kwargs
        )

    def start(self) -> "Display":
        """
        start display

        :rtype: self
        """
        self._obj.start()
        return self

    def stop(self) -> "Display":
        """
        stop display

        :rtype: self
        """
        self._obj.stop()
        return self

    def __enter__(self):
        """used by the :keyword:`with` statement"""
        self.start()
        return self

    def __exit__(self, *exc_info):
        """used by the :keyword:`with` statement"""
        self.stop()

    def is_alive(self) -> bool:
        return self._obj.is_alive()

    # @property
    # def return_code(self):
    #     return self._obj.return_code

    @property
    def pid(self) -> int:
        """
        PID (:attr:`subprocess.Popen.pid`)

        :rtype: int
        """
        return self._obj.pid

    @property
    def display(self) -> int:
        """The new $DISPLAY variable as int.  Example 1 if $DISPLAY=':1'"""
        return self._obj.display

    @property
    def new_display_var(self) -> str:
        """The new $DISPLAY variable like ':1'"""
        return self._obj.new_display_var

    def env(self) -> Dict[str, str]:
        """env() copies global os.environ and adds disp.new_display_var"""
        return self._obj._env()
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