com_example_hello_world
├─ gui
│  ├─ init.py
│  └─ spokes
│     └─ init.py
└─ tui
   ├─ init.py
   └─ spokes
   └─ init.py

<!DOCTYPE busconfig PUBLIC
"-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
       <policy user="root">
               <allow own="org.fedoraproject.Anaconda.Addons.HelloWorld"/>
               <allow send_destination="org.fedoraproject.Anaconda.Addons.HelloWorld"/>
       </policy>
       <policy context="default">
               <deny own="org.fedoraproject.Anaconda.Addons.HelloWorld"/>
               <allow send_destination="org.fedoraproject.Anaconda.Addons.HelloWorld"/>
       </policy>
</busconfig>

[D-BUS Service]
# Start the org.fedoraproject.Anaconda.Addons.HelloWorld service.
# Runs org_fedora_hello_world/service/main.py
Name=org.fedoraproject.Anaconda.Addons.HelloWorld
Exec=/usr/libexec/anaconda/start-module org_fedora_hello_world.service
User=root

# 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, bootloader, 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))

        # every GUIObject gets ksdata in init
        dialog = HelloWorldDialog(self.data)

        # show dialog above the lightbox
        with self.main_window.enlightbox(dialog.window):
            dialog.run()

@classmethod
    def should_run(cls, environment, data):
    """Run this spoke for Anaconda and Initial Setup"""
    return True

def __init__(self, *args, **kwargs):
    """
    Create the representation of the spoke.

    :see: simpleline.render.screen.UIScreen
    """
    super().__init__(*args, **kwargs)
    self.title = N_("Hello World")
    self._hello_world_module = HELLO_WORLD.get_proxy()
    self._container = None
    self._reverse = False
    self._lines = ""

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 separated thread.

    :see: pyanaconda.ui.common.UIObject.initialize
    """
    # nothing to do here
    super().initialize()

def setup(self, args=None):
    """
    The setup method that is called right before the spoke is entered.
    It should update its state according to the contents of DBus modules.

    :see: simpleline.render.screen.UIScreen.setup
    """
    super().setup(args)

    self._reverse = self._hello_world_module.Reverse
    self._lines = self._hello_world_module.Lines

    return True

def refresh(self, args=None):
    """
    The refresh method that is called every time the spoke is displayed.
    It should generate the UI elements according to its state.

    :see: pyanaconda.ui.common.UIObject.refresh
    :see: simpleline.render.screen.UIScreen.refresh
    """
    super().refresh(args)

    self._container = ListColumnContainer(
        columns=1
    )
    self._container.add(
        CheckboxWidget(
            title="Reverse",
            completed=self._reverse
        ),
        callback=self._change_reverse
    )
    self._container.add(
        EntryWidget(
            title="Hello world text",
            value="".join(self._lines)
        ),
        callback=self._change_lines
    )

    self.window.add_with_separator(self._container)

def _change_reverse(self, data):
    """
    Callback when user wants to switch checkbox.
    Flip state of the "reverse" parameter which is boolean.
    """
    self._reverse = not self._reverse

def _change_lines(self, data):
    """
    Callback when user wants to input new lines.
    Show a dialog and save the provided lines.
    """
    dialog = Dialog("Lines")
    result = dialog.run()
    self._lines = result.splitlines(True)

def input(self, args, key):
    """
    The input method that is called by the main loop on user's input.

    * If the input should not be handled here, return it.
    * If the input is invalid, return InputState.DISCARDED.
    * If the input is handled and the current screen should be refreshed,
      return InputState.PROCESSED_AND_REDRAW.
    * If the input is handled and the current screen should be closed,
      return InputState.PROCESSED_AND_CLOSE.

    :see: simpleline.render.screen.UIScreen.input
    """
    if self._container.process_user_input(key):
        return InputState.PROCESSED_AND_REDRAW

    if key.lower() == Prompt.CONTINUE:
        self.apply()
        self.execute()
        return InputState.PROCESSED_AND_CLOSE

    return super().input(args, key)

def apply(self):
    """
    The apply method is not called automatically for TUI. It should be called
    in input() if required. It should update the contents of internal data
    structures with values set in the spoke.
    """
    self._hello_world_module.SetReverse(self._reverse)
    self._hello_world_module.SetLines(self._lines)

def execute(self):
    """
    The execute method is not called automatically for TUI. It should be called
    in input() if required. It is supposed to do all changes to the runtime
    environment according to the values set in the spoke.
    """
    # nothing to do here
    pass

class HelloWorldEditSpoke(NormalTUISpoke):
    """Example class demonstrating usage of editing in TUI"""

    category = HelloWorldCategory

    def init(self, data, storage, payload):
        """
        :see: simpleline.render.screen.UIScreen
        :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, bootloader, etc.)
        :type storage: blivet.Blivet
        :param payload: object storing packaging-related information
        :type payload: pyanaconda.packaging.Payload
        """
        NormalTUISpoke.init(self, data, storage, payload)

        self.title = N_("Hello World Edit")
        self._container = None
        # values for user to set
        self._checked = False
        self._unconditional_input = ""
        self._conditional_input = ""

    def refresh(self, args=None):
        """
        The refresh method that is called every time the spoke is displayed.
        It should update the UI elements according to the contents of
        self.data.
        :see: pyanaconda.ui.common.UIObject.refresh
        :see: simpleline.render.screen.UIScreen.refresh
        :param args: optional argument that may be used when the screen is
                     scheduled
        :type args: anything
        """
        super().refresh(args)
        self._container = ListColumnContainer(columns=1)

        # add ListColumnContainer to window (main window container)
        # this will automatically add numbering and will call callbacks when required
        self.window.add(self._container)

        self._container.add(CheckboxWidget(title="Simple checkbox", completed=self._checked),
                            callback=self._checkbox_called)
        self._container.add(EntryWidget(title="Unconditional text input",
                                        value=self._unconditional_input),
                            callback=self._get_unconditional_input)

        # show conditional input only if the checkbox is checked
        if self._checked:
            self._container.add(EntryWidget(title="Conditional password input",
                                            value="Password set" if self._conditional_input
                                            else ""),
                                callback=self._get_conditional_input)

        self._window.add_separator()


    @property
    def completed(self):
        # completed if user entered something non-empty to the Conditioned input
        return bool(self._conditional_input)
    @property
    def status(self):
        return "Hidden input %s" % ("entered" if self._conditional_input
                                    else "not entered")

    def apply(self):
        # nothing needed here, values are set in the self.args tree
        pass