5.10. 对附加图形用户界面(GUI)添加支持

# will never be translated
_ = lambda x: x
N_ = lambda x: x

# the path to addons is in sys.path so we can import things from org_fedora_hello_world
from org_fedora_hello_world.gui.categories.hello_world import HelloWorldCategory
from pyanaconda.ui.gui.spokes import NormalSpoke

# export only the spoke, no helper functions, classes or constants
all = ["HelloWorldSpoke"]

class HelloWorldSpoke(FirstbootSpokeMixIn, NormalSpoke):
    """
    Class for the Hello world spoke. This spoke will be in the Hello world
    category and thus on the Summary hub. It is a very simple example of a unit
    for the Anaconda's graphical user interface. Since it is also inherited form
    the FirstbootSpokeMixIn, it will also appear in the Initial Setup (successor
    of the Firstboot tool).

    :see: pyanaconda.ui.common.UIObject
    :see: pyanaconda.ui.common.Spoke
    :see: pyanaconda.ui.gui.GUIObject
    :see: pyanaconda.ui.common.FirstbootSpokeMixIn
    :see: pyanaconda.ui.gui.spokes.NormalSpoke

    """

    # class attributes defined by API #

    # list all top-level objects from the .glade file that should be exposed
    # to the spoke or leave empty to extract everything
    builderObjects = ["helloWorldSpokeWindow", "buttonImage"]

    # the name of the main window widget
    mainWidgetName = "helloWorldSpokeWindow"

    # name of the .glade file in the same directory as this source
    uiFile = "hello_world.glade"

    # category this spoke belongs to
    category = HelloWorldCategory

    # spoke icon (will be displayed on the hub)
    # preferred are the -symbolic icons as these are used in Anaconda's spokes
    icon = "face-cool-symbolic"

    # title of the spoke (will be displayed on the hub)
    title = N_("_HELLO WORLD")

def __init__(self, data, storage, payload):
    """
    :see: pyanaconda.ui.common.Spoke.init
    :param data: data object passed to every spoke to load/store data
    from/to it
    :type data: pykickstart.base.BaseHandler
    :param storage: object storing storage-related information
    (disks, partitioning, boot loader, etc.)
    :type storage: blivet.Blivet
    :param payload: object storing packaging-related information
    :type payload: pyanaconda.packaging.Payload

    """

    NormalSpoke.init(self, data, storage, payload)
    self._hello_world_module = HELLO_WORLD.get_proxy()

def initialize(self):
    """
    The initialize method that is called after the instance is created.
    The difference between init and this method is that this may take
    a long time and thus could be called in a separate thread.
    :see: pyanaconda.ui.common.UIObject.initialize
    """
    NormalSpoke.initialize(self)
    self._entry = self.builder.get_object("textLines")
    self._reverse = self.builder.get_object("reverseCheckButton")

def refresh(self):
    """
    The refresh method that is called every time the spoke is displayed.
    It should update the UI elements according to the contents of
    internal data structures.
    :see: pyanaconda.ui.common.UIObject.refresh
    """
    lines = self._hello_world_module.Lines
    self._entry.get_buffer().set_text("".join(lines))
    reverse = self._hello_world_module.Reverse
    self._reverse.set_active(reverse)

def apply(self):
    """
    The apply method that is called when user leaves the spoke. It should
    update the D-Bus service with values set in the GUI elements.
    """
    buf = self._entry.get_buffer()
    text = buf.get_text(buf.get_start_iter(),
                        buf.get_end_iter(),
                        True)
    lines = text.splitlines(True)
    self._hello_world_module.SetLines(lines)

    self._hello_world_module.SetReverse(self._reverse.get_active())

def execute(self):
  """
  The execute method that is called when the spoke is exited. It is
  supposed to do all changes to the runtime environment according to
  the values set in the GUI elements.

  """

  # nothing to do here
  pass

@property
def ready(self):
    """
    The ready property reports whether the spoke is ready, that is, can be visited
    or not. The spoke is made (in)sensitive based on the returned value of the ready
    property.

    :rtype: bool

    """

    # this spoke is always ready
    return True


@property
def mandatory(self):
    """
    The mandatory property that tells whether the spoke is mandatory to be
    completed to continue in the installation process.

    :rtype: bool

    """

    # this is an optional spoke that is not mandatory to be completed
    return False

@property
def status(self):
    """
    The status property that is a brief string describing the state of the
    spoke. It should describe whether all values are set and if possible
    also the values themselves. The returned value will appear on the hub
    below the spoke's title.
    :rtype: str
    """
    lines = self._hello_world_module.Lines
    if not lines:
        return _("No text added")
    elif self._hello_world_module.Reverse:
        return _("Text set with {} lines to reverse").format(len(lines))
    else:
        return _("Text set with {} lines").format(len(lines))