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154 lines
5.0 KiB
Python
154 lines
5.0 KiB
Python
"""
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Components/ScreenManager
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========================
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.. versionadded:: 1.0.0
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:class:`~kivy.uix.screenmanager.ScreenManager` class equivalent.
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If you want to use Hero animations you need to use
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:class:`~kivymd.uix.screenmanager.MDScreenManager` not
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:class:`~kivy.uix.screenmanager.ScreenManager` class.
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Transition
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----------
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:class:`~kivymd.uix.screenmanager.MDScreenManager` class supports the following
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transitions:
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- :class:`~kivymd.uix.transition.MDFadeSlideTransition`
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- :class:`~kivymd.uix.transition.MDSlideTransition`
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- :class:`~kivymd.uix.transition.MDSwapTransition`
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You need to use the :class:`~kivymd.uix.screenmanager.MDScreenManager` class
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when you want to use hero animations on your screens. If you don't need hero
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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
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from kivy.properties import ListProperty, StringProperty
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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.
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For more
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information, see in the :class:`~kivy.uix.screenmanager.ScreenManager`
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class documentation.
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"""
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current_hero = StringProperty(None, deprecated=True)
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"""
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The name of the current tag for the :class:`~kivymd.uix.hero.MDHeroFrom`
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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
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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
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animations.
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:attr:`current_hero` is an :class:`~kivy.properties.StringProperty`
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and defaults to `None`.
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"""
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current_heroes = ListProperty()
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"""
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A list of names (tags) of heroes that need to be animated when moving
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to the next screen.
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.. versionadded:: 1.1.0
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:attr:`current_heroes` is an :class:`~kivy.properties.ListProperty`
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and defaults to `[]`.
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"""
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# Collection of `MDHeroFrom` objects on all screens of the current
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# screen manager.
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_heroes_data = ListProperty()
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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Clock.schedule_once(self.check_transition)
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def check_transition(self, *args) -> None:
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"""Sets the default type transition."""
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from kivymd.uix.transition.transition import MDTransitionBase
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if not issubclass(self.transition.__class__, MDTransitionBase):
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from kivymd.uix.transition import MDSlideTransition
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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
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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:
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for hero_widget in self._heroes_data:
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if isinstance(hero_widget, MDHeroFrom) or issubclass(
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hero_widget.__class__, MDHeroFrom
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):
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if hero_widget.tag == name_hero:
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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:
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"""
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Called when the value of the :attr:`current_hero` attribute changes.
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"""
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Logger.warning(
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"KivyMD: "
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"`kivymd/uix/screenmanager.MDScreenManager.current_hero` "
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"attribute is deprecated. "
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"Use `kivymd/uix/screenmanager.MDScreenManager.current_heroes` "
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"attribute instead."
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)
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if value:
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self.current_heroes = [value]
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else:
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self.current_heroes = []
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def add_widget(self, widget, *args, **kwargs):
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super().add_widget(widget, *args, **kwargs)
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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`
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# collection when deleting an object using the `remove_widget` method.
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def _create_heroes_data(self, widget):
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def find_hero_widget(child_widget):
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widget_hero = None
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for w in child_widget.children:
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if isinstance(w, MDHeroFrom) or issubclass(
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w.__class__, MDHeroFrom
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):
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self._heroes_data.append(w)
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find_hero_widget(w)
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return widget_hero
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for child in widget.children:
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if isinstance(child, MDHeroFrom) or issubclass(
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child.__class__, MDHeroFrom
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):
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self._heroes_data.append(child)
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else:
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find_hero_widget(child)
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