392 lines
12 KiB
Python
Executable file
392 lines
12 KiB
Python
Executable file
"""
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Behaviors/Ripple
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================
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.. rubric:: Classes implements a circular and rectangular ripple effects.
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To create a widget with сircular ripple effect, you must create a new class
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that inherits from the :class:`~CircularRippleBehavior` class.
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For example, let's create an image button with a circular ripple effect:
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.. code-block:: python
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from kivy.lang import Builder
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from kivy.uix.behaviors import ButtonBehavior
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from kivy.uix.image import Image
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from kivymd.app import MDApp
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from kivymd.uix.behaviors import CircularRippleBehavior
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KV = '''
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#:import images_path kivymd.images_path
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Screen:
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CircularRippleButton:
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source: f"{images_path}/kivymd.png"
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size_hint: None, None
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size: "250dp", "250dp"
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pos_hint: {"center_x": .5, "center_y": .5}
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'''
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class CircularRippleButton(CircularRippleBehavior, ButtonBehavior, Image):
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def __init__(self, **kwargs):
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self.ripple_scale = 0.85
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super().__init__(**kwargs)
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class Example(MDApp):
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def build(self):
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self.theme_cls.theme_style = "Dark"
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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/circular-ripple-effect.gif
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:align: center
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To create a widget with rectangular ripple effect, you must create a new class
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that inherits from the :class:`~RectangularRippleBehavior` class:
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.. code-block:: python
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from kivy.lang import Builder
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from kivy.uix.behaviors import ButtonBehavior
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from kivymd.app import MDApp
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from kivymd.uix.behaviors import RectangularRippleBehavior, BackgroundColorBehavior
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KV = '''
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Screen:
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RectangularRippleButton:
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size_hint: None, None
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size: "250dp", "50dp"
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pos_hint: {"center_x": .5, "center_y": .5}
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'''
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class RectangularRippleButton(
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RectangularRippleBehavior, ButtonBehavior, BackgroundColorBehavior
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):
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md_bg_color = [0, 0, 1, 1]
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class Example(MDApp):
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def build(self):
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self.theme_cls.theme_style = "Dark"
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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/rectangular-ripple-effect.gif
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:align: center
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"""
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__all__ = (
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"CommonRipple",
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"RectangularRippleBehavior",
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"CircularRippleBehavior",
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)
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from kivy.animation import Animation
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from kivy.graphics import (
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Color,
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Ellipse,
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Rectangle,
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StencilPop,
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StencilPush,
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StencilUnUse,
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StencilUse,
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)
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from kivy.properties import (
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BooleanProperty,
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ListProperty,
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NumericProperty,
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StringProperty,
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)
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class CommonRipple(object):
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"""Base class for ripple effect."""
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ripple_rad_default = NumericProperty(1)
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"""
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Default value of the ripple effect radius.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/ripple-rad-default.gif
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:align: center
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:attr:`ripple_rad_default` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `1`.
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"""
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ripple_color = ListProperty()
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"""
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Ripple color in ``rgba`` format.
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:attr:`ripple_color` is an :class:`~kivy.properties.ListProperty`
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and defaults to `[]`.
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"""
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ripple_alpha = NumericProperty(0.5)
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"""
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Alpha channel values for ripple effect.
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:attr:`ripple_alpha` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `0.5`.
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"""
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ripple_scale = NumericProperty(None)
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"""
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Ripple effect scale.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/ripple-scale-1.gif
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:align: center
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:attr:`ripple_scale` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `None`.
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"""
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ripple_duration_in_fast = NumericProperty(0.3)
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"""
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Ripple duration when touching to widget.
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:attr:`ripple_duration_in_fast` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `0.3`.
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"""
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ripple_duration_in_slow = NumericProperty(2)
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"""
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Ripple duration when long touching to widget.
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:attr:`ripple_duration_in_slow` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `2`.
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"""
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ripple_duration_out = NumericProperty(0.3)
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"""
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The duration of the disappearance of the wave effect.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/ripple-duration-out.gif
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:align: center
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:attr:`ripple_duration_out` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `0.3`.
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"""
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ripple_func_in = StringProperty("out_quad")
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"""
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Type of animation for ripple in effect.
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:attr:`ripple_func_in` is an :class:`~kivy.properties.StringProperty`
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and defaults to `'out_quad'`.
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"""
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ripple_func_out = StringProperty("out_quad")
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"""
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Type of animation for ripple out effect.
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:attr:`ripple_func_in` is an :class:`~kivy.properties.StringProperty`
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and defaults to `'ripple_func_out'`.
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"""
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_ripple_rad = NumericProperty()
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_doing_ripple = BooleanProperty(False)
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_finishing_ripple = BooleanProperty(False)
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_fading_out = BooleanProperty(False)
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_no_ripple_effect = BooleanProperty(False)
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def lay_canvas_instructions(self):
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raise NotImplementedError
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def start_ripple(self):
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if not self._doing_ripple:
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self._doing_ripple = True
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anim = Animation(
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_ripple_rad=self.finish_rad,
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t="linear",
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duration=self.ripple_duration_in_slow,
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)
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anim.bind(on_complete=self.fade_out)
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anim.start(self)
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def finish_ripple(self):
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if self._doing_ripple and not self._finishing_ripple:
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self._finishing_ripple = True
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self._doing_ripple = False
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Animation.cancel_all(self, "_ripple_rad")
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anim = Animation(
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_ripple_rad=self.finish_rad,
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t=self.ripple_func_in,
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duration=self.ripple_duration_in_fast,
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)
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anim.bind(on_complete=self.fade_out)
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anim.start(self)
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def fade_out(self, *args):
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rc = self.ripple_color
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if not self._fading_out:
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self._fading_out = True
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Animation.cancel_all(self, "ripple_color")
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anim = Animation(
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ripple_color=[rc[0], rc[1], rc[2], 0.0],
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t=self.ripple_func_out,
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duration=self.ripple_duration_out,
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)
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anim.bind(on_complete=self.anim_complete)
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anim.start(self)
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def anim_complete(self, *args):
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self._doing_ripple = False
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self._finishing_ripple = False
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self._fading_out = False
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self.canvas.after.clear()
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def on_touch_down(self, touch):
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if touch.is_mouse_scrolling:
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return False
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if not self.collide_point(touch.x, touch.y):
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return False
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if not self.disabled:
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if self._doing_ripple:
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Animation.cancel_all(
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self, "_ripple_rad", "ripple_color", "rect_color"
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)
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self.anim_complete()
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self._ripple_rad = self.ripple_rad_default
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self.ripple_pos = (touch.x, touch.y)
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if self.ripple_color:
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pass
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elif hasattr(self, "theme_cls"):
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self.ripple_color = self.theme_cls.ripple_color
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else:
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# If no theme, set Gray 300.
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self.ripple_color = [
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0.8784313725490196,
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0.8784313725490196,
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0.8784313725490196,
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self.ripple_alpha,
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]
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self.ripple_color[3] = self.ripple_alpha
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self.lay_canvas_instructions()
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self.finish_rad = max(self.width, self.height) * self.ripple_scale
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self.start_ripple()
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return super().on_touch_down(touch)
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def on_touch_move(self, touch, *args):
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if not self.collide_point(touch.x, touch.y):
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if not self._finishing_ripple and self._doing_ripple:
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self.finish_ripple()
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return super().on_touch_move(touch, *args)
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def on_touch_up(self, touch):
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if self.collide_point(touch.x, touch.y) and self._doing_ripple:
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self.finish_ripple()
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return super().on_touch_up(touch)
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def _set_ellipse(self, instance, value):
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self.ellipse.size = (self._ripple_rad, self._ripple_rad)
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# Adjust ellipse pos here
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def _set_color(self, instance, value):
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self.col_instruction.a = value[3]
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class RectangularRippleBehavior(CommonRipple):
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"""Class implements a rectangular ripple effect."""
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ripple_scale = NumericProperty(2.75)
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"""
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See :class:`~CommonRipple.ripple_scale`.
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:attr:`ripple_scale` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `2.75`.
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"""
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def lay_canvas_instructions(self):
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if self._no_ripple_effect:
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return
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with self.canvas.after:
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StencilPush()
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Rectangle(pos=self.pos, size=self.size)
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StencilUse()
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self.col_instruction = Color(rgba=self.ripple_color)
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self.ellipse = Ellipse(
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size=(self._ripple_rad, self._ripple_rad),
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pos=(
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self.ripple_pos[0] - self._ripple_rad / 2.0,
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self.ripple_pos[1] - self._ripple_rad / 2.0,
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),
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)
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StencilUnUse()
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Rectangle(pos=self.pos, size=self.size)
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StencilPop()
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self.bind(ripple_color=self._set_color, _ripple_rad=self._set_ellipse)
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def _set_ellipse(self, instance, value):
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super()._set_ellipse(instance, value)
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self.ellipse.pos = (
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self.ripple_pos[0] - self._ripple_rad / 2.0,
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self.ripple_pos[1] - self._ripple_rad / 2.0,
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)
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class CircularRippleBehavior(CommonRipple):
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"""Class implements a circular ripple effect."""
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ripple_scale = NumericProperty(1)
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"""
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See :class:`~CommonRipple.ripple_scale`.
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:attr:`ripple_scale` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `1`.
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"""
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def lay_canvas_instructions(self):
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with self.canvas.after:
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StencilPush()
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self.stencil = Ellipse(
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size=(
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self.width * self.ripple_scale,
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self.height * self.ripple_scale,
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),
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pos=(
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self.center_x - (self.width * self.ripple_scale) / 2,
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self.center_y - (self.height * self.ripple_scale) / 2,
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),
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)
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StencilUse()
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self.col_instruction = Color(rgba=self.ripple_color)
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self.ellipse = Ellipse(
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size=(self._ripple_rad, self._ripple_rad),
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pos=(
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self.center_x - self._ripple_rad / 2.0,
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self.center_y - self._ripple_rad / 2.0,
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),
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)
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StencilUnUse()
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Ellipse(pos=self.pos, size=self.size)
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StencilPop()
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self.bind(
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ripple_color=self._set_color, _ripple_rad=self._set_ellipse
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)
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def _set_ellipse(self, instance, value):
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super()._set_ellipse(instance, value)
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if self.ellipse.size[0] > self.width * 0.6 and not self._fading_out:
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self.fade_out()
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self.ellipse.pos = (
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self.center_x - self._ripple_rad / 2.0,
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self.center_y - self._ripple_rad / 2.0,
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)
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