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93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
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"""
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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 :class:`~kivymd.uix.screenmanager.MDScreenManager`
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not :class:`~kivy.uix.screenmanager.ScreenManager` class.
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"""
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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.hero import MDHeroFrom
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class MDScreenManager(ScreenManager):
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current_hero = StringProperty(None)
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"""
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The name of the current tag for the :class:`~kivymd.uix.hero.MDHeroFrom` and
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:class:`~kivymd.uix.hero.MDHeroTo` objects that will be animated when
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animating the transition between screens.
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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`
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and defaults to `None`.
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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, **kwargs):
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super().__init__(**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) -> None:
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"""
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Get an :class:`~kivymd.uix.hero.MDHeroTo` object with the
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:attr:`~current_hero` tag.
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"""
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hero_from_widget = None
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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 == self.current_hero:
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hero_from_widget = hero_widget
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break
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return hero_from_widget
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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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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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