test-kivy-app/kivy_venv/lib/python3.11/site-packages/kivymd/uix/screen.py

"""
Components/Screen
=================

:class:`~kivy.uix.screenmanager.Screen` class equivalent. Simplifies working
with some widget properties. For example:

Screen
------

.. code-block:: kv

    Screen:
        canvas:
            Color:
                rgba: app.theme_cls.primaryColor
            RoundedRectangle:
                pos: self.pos
                size: self.size
                radius: [25, 0, 0, 0]

MDScreen
--------

.. code-block:: kv

    MDScreen:
        radius: [25, 0, 0, 0]
        md_bg_color: self.theme_cls.primaryColor
"""

from kivy.properties import ListProperty, ObjectProperty
from kivy.uix.screenmanager import Screen

from kivymd.theming import ThemableBehavior
from kivymd.uix import MDAdaptiveWidget
from kivymd.uix.behaviors import DeclarativeBehavior, BackgroundColorBehavior
from kivymd.uix.hero import MDHeroTo


class MDScreen(
    DeclarativeBehavior,
    ThemableBehavior,
    BackgroundColorBehavior,
    Screen,
    MDAdaptiveWidget,
):
    """
    Screen is an element intended to be used with a
    :class:`~kivymd.uix.screenmanager.MDScreenManager`.

    For more information see in the
    :class:`~kivymd.uix.behaviors.declarative_behavior.DeclarativeBehavior` and
    :class:`~kivymd.theming.ThemableBehavior` and
    :class:`~kivymd.uix.behaviors.backgroundcolor_behavior.BackgroundColorBehavior` and
    :class:`~kivy.uix.screenmanager.Screen` and
    :class:`~kivymd.uix.MDAdaptiveWidget`
    classes documentation.
    """

    hero_to = ObjectProperty(deprecated=True)
    """
    Must be a :class:`~kivymd.uix.hero.MDHeroTo` class.

    See the documentation of the
    `MDHeroTo <https://kivymd.readthedocs.io/en/latest/components/hero/>`_
    widget for more detailed information.

    .. deprecated:: 1.0.0
        Use attr:`heroes_to` attribute instead.

    :attr:`hero_to` is an :class:`~kivy.properties.ObjectProperty`
    and defaults to `None`.
    """

    heroes_to = ListProperty()
    """
    Must be a list of :class:`~kivymd.uix.hero.MDHeroTo` class.

    .. versionadded:: 1.0.0

    :attr:`heroes_to` is an :class:`~kivy.properties.LiatProperty`
    and defaults to `[]`.
    """

    def on_hero_to(self, screen, widget: MDHeroTo) -> None:
        """Fired when the value of the :attr:`hero_to` attribute changes."""

        if not isinstance(widget, MDHeroTo) or not issubclass(
            widget.__class__, MDHeroTo
        ):
            raise TypeError(
                f"The `{widget}` widget must be an `kivymd.uix.hero.MDHeroTo` "
                f"class or inherited from this class"
            )
        self.heroes_to = [widget]