261 lines
7.2 KiB
Python
261 lines
7.2 KiB
Python
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"""
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Components/Spinner
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==================
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.. rubric:: Circular progress indicator in Google's Material Design.
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Usage
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-----
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.. code-block:: python
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from kivy.lang import Builder
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from kivymd.app import MDApp
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KV = '''
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Screen:
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MDSpinner:
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size_hint: None, None
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size: dp(46), dp(46)
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pos_hint: {'center_x': .5, 'center_y': .5}
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active: True if check.active else False
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MDCheckbox:
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id: check
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size_hint: None, None
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size: dp(48), dp(48)
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pos_hint: {'center_x': .5, 'center_y': .4}
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active: True
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'''
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class Test(MDApp):
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def build(self):
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return Builder.load_string(KV)
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Test().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/spinner.gif
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:align: center
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Spinner palette
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---------------
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.. code-block:: kv
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MDSpinner:
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# The number of color values can be any.
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palette:
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[0.28627450980392155, 0.8431372549019608, 0.596078431372549, 1], \
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[0.3568627450980392, 0.3215686274509804, 0.8666666666666667, 1], \
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[0.8862745098039215, 0.36470588235294116, 0.592156862745098, 1], \
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[0.8784313725490196, 0.9058823529411765, 0.40784313725490196, 1],
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.. code-block:: python
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MDSpinner(
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size_hint=(None, None),
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size=(dp(46), dp(46)),
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pos_hint={'center_x': .5, 'center_y': .5},
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active=True,
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palette=[
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[0.28627450980392155, 0.8431372549019608, 0.596078431372549, 1],
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[0.3568627450980392, 0.3215686274509804, 0.8666666666666667, 1],
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[0.8862745098039215, 0.36470588235294116, 0.592156862745098, 1],
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[0.8784313725490196, 0.9058823529411765, 0.40784313725490196, 1],
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]
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)
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/spinner-palette.gif
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:align: center
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"""
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__all__ = ("MDSpinner",)
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from kivy.animation import Animation
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from kivy.lang import Builder
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from kivy.properties import BooleanProperty, ListProperty, NumericProperty
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from kivy.uix.widget import Widget
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from kivymd.theming import ThemableBehavior
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Builder.load_string(
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"""
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<MDSpinner>
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canvas.before:
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PushMatrix
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Rotate:
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angle: self._rotation_angle
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origin: self.center
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canvas:
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Color:
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rgba: self.color
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a: self._alpha
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SmoothLine:
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circle: self.center_x, self.center_y, self.width / 2,\
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self._angle_start, self._angle_end
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cap: 'square'
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width: dp(2.25)
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canvas.after:
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PopMatrix
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"""
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)
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class MDSpinner(ThemableBehavior, Widget):
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""":class:`MDSpinner` is an implementation of the circular progress
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indicator in `Google's Material Design`.
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It can be used either as an indeterminate indicator that loops while
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the user waits for something to happen, or as a determinate indicator.
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Set :attr:`determinate` to **True** to activate determinate mode, and
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:attr:`determinate_time` to set the duration of the animation.
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"""
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determinate = BooleanProperty(False)
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"""
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Determinate value.
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:attr:`determinate` is a :class:`~kivy.properties.BooleanProperty`
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and defaults to `False`.
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"""
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determinate_time = NumericProperty(2)
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"""
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Determinate time value.
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:attr:`determinate_time` is a :class:`~kivy.properties.NumericProperty`
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and defaults to `2`.
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"""
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active = BooleanProperty(True)
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"""Use :attr:`active` to start or stop the spinner.
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:attr:`active` is a :class:`~kivy.properties.BooleanProperty`
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and defaults to `True`.
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"""
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color = ListProperty([0, 0, 0, 0])
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"""
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Spinner color.
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:attr:`color` is a :class:`~kivy.properties.ListProperty`
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and defaults to ``self.theme_cls.primary_color``.
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"""
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palette = ListProperty()
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"""
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A set of colors. Changes with each completed spinner cycle.
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:attr:`palette` is a :class:`~kivy.properties.ListProperty`
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and defaults to `[]`.
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"""
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_alpha = NumericProperty(0)
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_rotation_angle = NumericProperty(360)
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_angle_start = NumericProperty(0)
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_angle_end = NumericProperty(0)
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_palette = []
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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self.color = self.theme_cls.primary_color
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self._alpha_anim_in = Animation(_alpha=1, duration=0.8, t="out_quad")
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self._alpha_anim_out = Animation(_alpha=0, duration=0.3, t="out_quad")
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self._alpha_anim_out.bind(on_complete=self._reset)
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self.theme_cls.bind(primary_color=self._update_color)
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if self.determinate:
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self._start_determinate()
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else:
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self._start_loop()
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def _update_color(self, *args):
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self.color = self.theme_cls.primary_color
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def _start_determinate(self, *args):
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self._alpha_anim_in.start(self)
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_rot_anim = Animation(
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_rotation_angle=0,
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duration=self.determinate_time * 0.7,
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t="out_quad",
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)
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_rot_anim.start(self)
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_angle_start_anim = Animation(
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_angle_end=360, duration=self.determinate_time, t="in_out_quad"
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)
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_angle_start_anim.bind(
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on_complete=lambda *x: self._alpha_anim_out.start(self)
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)
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_angle_start_anim.start(self)
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def _start_loop(self, *args):
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if self._alpha == 0:
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_rot_anim = Animation(_rotation_angle=0, duration=2, t="linear")
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_rot_anim.start(self)
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self._alpha = 1
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self._alpha_anim_in.start(self)
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_angle_start_anim = Animation(
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_angle_end=self._angle_end + 270, duration=0.6, t="in_out_cubic"
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)
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_angle_start_anim.bind(on_complete=self._anim_back)
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_angle_start_anim.start(self)
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def _anim_back(self, *args):
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_angle_back_anim = Animation(
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_angle_start=self._angle_end - 8, duration=0.6, t="in_out_cubic"
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)
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_angle_back_anim.bind(on_complete=self._start_loop)
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_angle_back_anim.start(self)
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def on__rotation_angle(self, *args):
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if self._rotation_angle == 0:
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self._rotation_angle = 360
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if not self.determinate:
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_rot_anim = Animation(_rotation_angle=0, duration=2)
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_rot_anim.start(self)
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elif self._rotation_angle == 360:
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if self._palette:
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try:
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Animation(color=next(self._palette), duration=2).start(self)
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except StopIteration:
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self._palette = iter(self.palette)
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Animation(color=next(self._palette), duration=2).start(self)
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def _reset(self, *args):
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Animation.cancel_all(
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self,
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"_angle_start",
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"_rotation_angle",
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"_angle_end",
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"_alpha",
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"color",
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)
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self._angle_start = 0
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self._angle_end = 0
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self._rotation_angle = 360
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self._alpha = 0
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self.active = False
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def on_palette(self, instance, value):
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self._palette = iter(value)
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def on_active(self, *args):
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if not self.active:
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self._reset()
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else:
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if self.determinate:
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self._start_determinate()
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else:
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self._start_loop()
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