190 lines
4.5 KiB
Python
190 lines
4.5 KiB
Python
"""
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Behaviors/Magic
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===============
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.. rubric:: Magical effects for buttons.
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.. warning:: Magic effects do not work correctly with `KivyMD` buttons!
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To apply magic effects, you must create a new class that is inherited from the
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widget to which you apply the effect and from the :attr:`MagicBehavior` class.
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In `KV file`:
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.. code-block:: kv
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<MagicButton@MagicBehavior+MDRectangleFlatButton>
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In `python file`:
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.. code-block:: python
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class MagicButton(MagicBehavior, MDRectangleFlatButton):
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pass
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.. rubric:: The :attr:`MagicBehavior` class provides five effects:
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- :attr:`MagicBehavior.wobble`
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- :attr:`MagicBehavior.grow`
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- :attr:`MagicBehavior.shake`
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- :attr:`MagicBehavior.twist`
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- :attr:`MagicBehavior.shrink`
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Example:
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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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<MagicButton@MagicBehavior+MDRectangleFlatButton>
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MDFloatLayout:
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MagicButton:
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text: "WOBBLE EFFECT"
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on_release: self.wobble()
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pos_hint: {"center_x": .5, "center_y": .3}
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MagicButton:
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text: "GROW EFFECT"
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on_release: self.grow()
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pos_hint: {"center_x": .5, "center_y": .4}
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MagicButton:
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text: "SHAKE EFFECT"
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on_release: self.shake()
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pos_hint: {"center_x": .5, "center_y": .5}
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MagicButton:
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text: "TWIST EFFECT"
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on_release: self.twist()
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pos_hint: {"center_x": .5, "center_y": .6}
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MagicButton:
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text: "SHRINK EFFECT"
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on_release: self.shrink()
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pos_hint: {"center_x": .5, "center_y": .7}
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'''
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class Example(MDApp):
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def build(self):
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return Builder.load_string(KV)
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Example().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/magic-button.gif
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:width: 250 px
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:align: center
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"""
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__all__ = ("MagicBehavior",)
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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 NumericProperty
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Builder.load_string(
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"""
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<MagicBehavior>
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translate_x: 0
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translate_y: 0
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scale_x: 1
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scale_y: 1
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rotate: 0
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canvas.before:
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PushMatrix
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Translate:
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x: self.translate_x or 0
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y: self.translate_y or 0
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Rotate:
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origin: self.center
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angle: self.rotate or 0
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Scale:
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origin: self.center
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x: self.scale_x or 1
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y: self.scale_y or 1
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canvas.after:
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PopMatrix
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"""
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)
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class MagicBehavior:
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magic_speed = NumericProperty(1)
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"""
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Animation playback speed.
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:attr:`magic_speed` is a :class:`~kivy.properties.NumericProperty`
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and defaults to `1`.
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"""
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def grow(self) -> None:
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"""Grow effect animation."""
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(
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Animation(
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scale_x=1.2,
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scale_y=1.2,
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t="out_quad",
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d=0.03 / self.magic_speed,
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)
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+ Animation(
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scale_x=1, scale_y=1, t="out_elastic", d=0.4 / self.magic_speed
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)
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).start(self)
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def shake(self) -> None:
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"""Shake effect animation."""
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(
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Animation(translate_x=50, t="out_quad", d=0.02 / self.magic_speed)
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+ Animation(
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translate_x=0, t="out_elastic", d=0.5 / self.magic_speed
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)
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).start(self)
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def wobble(self) -> None:
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"""Wobble effect animation."""
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(
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(
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Animation(scale_y=0.7, t="out_quad", d=0.03 / self.magic_speed)
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& Animation(
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scale_x=1.4, t="out_quad", d=0.03 / self.magic_speed
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)
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)
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+ (
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Animation(scale_y=1, t="out_elastic", d=0.5 / self.magic_speed)
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& Animation(
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scale_x=1, t="out_elastic", d=0.4 / self.magic_speed
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)
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)
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).start(self)
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def twist(self) -> None:
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"""Twist effect animation."""
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(
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Animation(rotate=25, t="out_quad", d=0.05 / self.magic_speed)
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+ Animation(rotate=0, t="out_elastic", d=0.5 / self.magic_speed)
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).start(self)
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def shrink(self) -> None:
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"""Shrink effect animation."""
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Animation(
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scale_x=0.95, scale_y=0.95, t="out_quad", d=0.1 / self.magic_speed
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).start(self)
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def on_touch_up(self, *args):
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Animation.stop_all(self)
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return super().on_touch_up(*args)
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