openCom-Companion/sbapp/kivymd/uix/screenmanager.py

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"""
Components/ScreenManager
========================
.. versionadded:: 1.0.0
:class:`~kivy.uix.screenmanager.ScreenManager` class equivalent.
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If you want to use Hero animations you need to use
:class:`~kivymd.uix.screenmanager.MDScreenManager` not
:class:`~kivy.uix.screenmanager.ScreenManager` class.
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Transition
----------
:class:`~kivymd.uix.screenmanager.MDScreenManager` class supports the following
transitions:
- :class:`~kivymd.uix.transition.MDFadeSlideTransition`
- :class:`~kivymd.uix.transition.MDSlideTransition`
- :class:`~kivymd.uix.transition.MDSwapTransition`
You need to use the :class:`~kivymd.uix.screenmanager.MDScreenManager` class
when you want to use hero animations on your screens. If you don't need hero
animation use the :class:`~kivy.uix.screenmanager.ScreenManager` class.
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"""
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from kivy import Logger
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from kivy.clock import Clock
from kivy.properties import ListProperty, StringProperty
from kivy.uix.screenmanager import ScreenManager
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from kivymd.uix.behaviors import DeclarativeBehavior
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from kivymd.uix.hero import MDHeroFrom
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class MDScreenManager(DeclarativeBehavior, ScreenManager):
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"""
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Screen manager. This is the main class that will control your
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:class:`~kivymd.uix.screen.MDScreen` stack and memory.
For more
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information, see in the :class:`~kivy.uix.screenmanager.ScreenManager`
class documentation.
"""
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current_hero = StringProperty(None, deprecated=True)
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"""
The name of the current tag for the :class:`~kivymd.uix.hero.MDHeroFrom`
and :class:`~kivymd.uix.hero.MDHeroTo` objects that will be animated when
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animating the transition between screens.
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.. deprecated:: 1.1.0
Use :attr:`current_heroes` attribute instead.
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See the `Hero <https://kivymd.readthedocs.io/en/latest/components/hero/>`_
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module documentation for more information about creating and using Hero
animations.
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:attr:`current_hero` is an :class:`~kivy.properties.StringProperty`
and defaults to `None`.
"""
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current_heroes = ListProperty()
"""
A list of names (tags) of heroes that need to be animated when moving
to the next screen.
.. versionadded:: 1.1.0
:attr:`current_heroes` is an :class:`~kivy.properties.ListProperty`
and defaults to `[]`.
"""
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# Collection of `MDHeroFrom` objects on all screens of the current
# screen manager.
_heroes_data = ListProperty()
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def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
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Clock.schedule_once(self.check_transition)
def check_transition(self, *args) -> None:
"""Sets the default type transition."""
from kivymd.uix.transition.transition import MDTransitionBase
if not issubclass(self.transition.__class__, MDTransitionBase):
from kivymd.uix.transition import MDSlideTransition
self.transition = MDSlideTransition()
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def get_hero_from_widget(self) -> list:
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"""
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Get a list of :class:`~kivymd.uix.hero.MDHeroFrom` objects according
to the tag names specified in the :attr:`~current_heroes` list.
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"""
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hero_from_widget = []
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for name_hero in self.current_heroes:
for hero_widget in self._heroes_data:
if isinstance(hero_widget, MDHeroFrom) or issubclass(
hero_widget.__class__, MDHeroFrom
):
if hero_widget.tag == name_hero:
hero_from_widget.append(hero_widget)
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return hero_from_widget
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def on_current_hero(self, instance, value: str) -> None:
"""
Called when the value of the :attr:`current_hero` attribute changes.
"""
Logger.warning(
"KivyMD: "
"`kivymd/uix/screenmanager.MDScreenManager.current_hero` "
"attribute is deprecated. "
"Use `kivymd/uix/screenmanager.MDScreenManager.current_heroes` "
"attribute instead."
)
if value:
self.current_heroes = [value]
else:
self.current_heroes = []
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def add_widget(self, widget, *args, **kwargs):
super().add_widget(widget, *args, **kwargs)
Clock.schedule_once(lambda x: self._create_heroes_data(widget))
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# TODO: Add a method to delete an object from the arrt:`_heroes_data`
# collection when deleting an object using the `remove_widget` method.
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def _create_heroes_data(self, widget):
def find_hero_widget(child_widget):
widget_hero = None
for w in child_widget.children:
if isinstance(w, MDHeroFrom) or issubclass(
w.__class__, MDHeroFrom
):
self._heroes_data.append(w)
find_hero_widget(w)
return widget_hero
for child in widget.children:
if isinstance(child, MDHeroFrom) or issubclass(
child.__class__, MDHeroFrom
):
self._heroes_data.append(child)
else:
find_hero_widget(child)