openCom-Companion/sbapp/kivymd/uix/behaviors/elevation.py

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"""
Behaviors/Elevation
===================
.. seealso::
`Material Design spec, Elevation <https://material.io/design/environment/elevation.html>`_
.. rubric:: Elevation is the relative distance between two surfaces along the z-axis.
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/elevation-previous.png
:align: center
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To create an elevation effect, use the :class:`~CommonElevationBehavior` class.
For example, let's create a button with a rectangular elevation effect:
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.. tabs::
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.. tab:: Declarative style with KV
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.. code-block:: python
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from kivy.lang import Builder
from kivy.uix.behaviors import ButtonBehavior
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from kivymd.app import MDApp
from kivymd.uix.behaviors import (
RectangularRippleBehavior,
BackgroundColorBehavior,
CommonElevationBehavior,
)
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KV = '''
<RectangularElevationButton>
size_hint: None, None
size: "250dp", "50dp"
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MDScreen:
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# With elevation effect
RectangularElevationButton:
pos_hint: {"center_x": .5, "center_y": .6}
elevation: 4.5
shadow_offset: 0, 6
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# Without elevation effect
RectangularElevationButton:
pos_hint: {"center_x": .5, "center_y": .4}
'''
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class RectangularElevationButton(
RectangularRippleBehavior,
CommonElevationBehavior,
ButtonBehavior,
BackgroundColorBehavior,
):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.md_bg_color = "red"
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class Example(MDApp):
def build(self):
return Builder.load_string(KV)
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Example().run()
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.. tab:: Declarative python style
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.. code-block:: python
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from kivy.uix.behaviors import ButtonBehavior
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from kivymd.app import MDApp
from kivymd.uix.behaviors import (
RectangularRippleBehavior,
BackgroundColorBehavior,
CommonElevationBehavior,
)
from kivymd.uix.screen import MDScreen
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class RectangularElevationButton(
RectangularRippleBehavior,
CommonElevationBehavior,
ButtonBehavior,
BackgroundColorBehavior,
):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.md_bg_color = "red"
self.size_hint = (None, None)
self.size = ("250dp", "50dp")
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class Example(MDApp):
def build(self):
return (
MDScreen(
RectangularElevationButton(
pos_hint={"center_x": .5, "center_y": .6},
elevation=4.5,
shadow_offset=(0, 6),
),
RectangularElevationButton(
pos_hint={"center_x": .5, "center_y": .4},
),
)
)
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Example().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/rectangular-elevation-effect.png
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:align: center
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.. warning::
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If before the KivyMD 1.1.0 library version you used the elevation property
with an average value of `12` for the shadow, then starting with the KivyMD
1.1.0 library version, the average value of the elevation property will be
somewhere `4`.
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Similarly, create a circular button:
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.. tabs::
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.. tab:: Declarative style with KV
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.. code-block:: python
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from kivy.lang import Builder
from kivy.uix.behaviors import ButtonBehavior
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from kivymd.app import MDApp
from kivymd.uix.behaviors import CircularRippleBehavior, CommonElevationBehavior
from kivymd.uix.floatlayout import MDFloatLayout
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KV = '''
<CircularElevationButton>
size_hint: None, None
size: "100dp", "100dp"
radius: self.size[0] / 2
shadow_radius: self.radius[0]
md_bg_color: "red"
MDIcon:
icon: "hand-heart"
halign: "center"
valign: "center"
pos_hint: {"center_x": .5, "center_y": .5}
size: root.size
pos: root.pos
font_size: root.size[0] * .6
theme_text_color: "Custom"
text_color: "white"
MDScreen:
CircularElevationButton:
pos_hint: {"center_x": .5, "center_y": .6}
elevation: 4
'''
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class CircularElevationButton(
CommonElevationBehavior,
CircularRippleBehavior,
ButtonBehavior,
MDFloatLayout,
):
pass
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class Example(MDApp):
def build(self):
return Builder.load_string(KV)
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Example().run()
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.. tab:: Declarative python style
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.. code-block:: python
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from kivy.metrics import dp
from kivy.uix.behaviors import ButtonBehavior
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from kivymd.app import MDApp
from kivymd.uix.behaviors import CircularRippleBehavior, CommonElevationBehavior
from kivymd.uix.floatlayout import MDFloatLayout
from kivymd.uix.label import MDIcon
from kivymd.uix.screen import MDScreen
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class CircularElevationButton(
CommonElevationBehavior,
CircularRippleBehavior,
ButtonBehavior,
MDFloatLayout,
):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.size_hint = (None, None)
self.size = (dp(100), dp(100))
self.radius = dp(100) / 2
self.shadow_radius = dp(100) / 2
self.md_bg_color = "red"
self.add_widget(
MDIcon(
icon="hand-heart",
halign="center",
valign="center",
pos_hint={"center_x": .5, "center_y": .5},
size=self.size,
theme_text_color="Custom",
text_color="white",
font_size=self.size[0] * 0.6,
)
)
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class Example(MDApp):
def build(self):
return (
MDScreen(
CircularElevationButton(
pos_hint={"center_x": .5, "center_y": .5},
elevation=4,
)
)
)
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Example().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/circular-elevation-effect.png
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:align: center
Animating the elevation
-----------------------
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.. tabs::
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.. tab:: Declarative style with KV
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.. code-block:: python
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from kivy.animation import Animation
from kivy.lang import Builder
from kivy.uix.behaviors import ButtonBehavior
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from kivymd.app import MDApp
from kivymd.uix.behaviors import CommonElevationBehavior, RectangularRippleBehavior
from kivymd.uix.widget import MDWidget
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KV = '''
MDScreen:
ElevatedWidget:
pos_hint: {'center_x': .5, 'center_y': .5}
size_hint: None, None
size: 100, 100
md_bg_color: 0, 0, 1, 1
elevation: 4
radius: 18
'''
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class ElevatedWidget(
CommonElevationBehavior,
RectangularRippleBehavior,
ButtonBehavior,
MDWidget,
):
_elev = 0 # previous elevation value
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def on_press(self, *args):
if not self._elev:
self._elev = self.elevation
Animation(elevation=self.elevation + 2, d=0.4).start(self)
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def on_release(self, *args):
Animation.cancel_all(self, "elevation")
Animation(elevation=self._elev, d=0.1).start(self)
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class Example(MDApp):
def build(self):
return Builder.load_string(KV)
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Example().run()
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.. tab:: Declarative python style
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.. code-block:: python
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from kivy.animation import Animation
from kivy.uix.behaviors import ButtonBehavior
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from kivymd.app import MDApp
from kivymd.uix.behaviors import CommonElevationBehavior, RectangularRippleBehavior
from kivymd.uix.screen import MDScreen
from kivymd.uix.widget import MDWidget
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class ElevatedWidget(
CommonElevationBehavior,
RectangularRippleBehavior,
ButtonBehavior,
MDWidget,
):
_elev = 0 # previous elevation value
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def on_press(self, *args):
if not self._elev:
self._elev = self.elevation
Animation(elevation=self.elevation + 2, d=0.4).start(self)
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def on_release(self, *args):
Animation.cancel_all(self, "elevation")
Animation(elevation=self._elev, d=0.1).start(self)
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class Example(MDApp):
def build(self):
return (
MDScreen(
ElevatedWidget(
pos_hint={'center_x': .5, 'center_y': .5},
size_hint=(None, None),
size=(100, 100),
md_bg_color="blue",
elevation=4,
radius=18,
)
)
)
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Example().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/rectangular-elevation-animation-effect.gif
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:align: center
"""
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from __future__ import annotations
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__all__ = (
"CommonElevationBehavior",
"RectangularElevationBehavior",
"CircularElevationBehavior",
"RoundedRectangularElevationBehavior",
"FakeRectangularElevationBehavior",
"FakeCircularElevationBehavior",
)
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import os
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from kivy import Logger
from kivy.clock import Clock
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from kivy.core.window import Window
from kivy.graphics import RenderContext, RoundedRectangle
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from kivy.properties import (
AliasProperty,
BooleanProperty,
BoundedNumericProperty,
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ColorProperty,
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ListProperty,
NumericProperty,
ObjectProperty,
VariableListProperty,
)
from kivy.uix.widget import Widget
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from kivymd import glsl_path
from kivymd.app import MDApp
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# FIXME: Add shadow manipulation with canvas instructions such as
# PushMatrix and PopMatrix.
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class CommonElevationBehavior(Widget):
"""Common base class for rectangular and circular elevation behavior."""
elevation = BoundedNumericProperty(0, min=0, errorvalue=0)
"""
Elevation of the widget.
:attr:`elevation` is an :class:`~kivy.properties.BoundedNumericProperty`
and defaults to `0`.
"""
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shadow_radius = VariableListProperty([0], length=4)
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"""
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Radius of the corners of the shadow.
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.. versionadded:: 1.1.0
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You don't have to use this parameter.
The radius of the elevation effect is calculated automatically one way
or another based on the radius of the parent widget, for 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 = '''
MDScreen:
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MDCard:
radius: 12, 46, 12, 46
size_hint: .5, .3
pos_hint: {"center_x": .5, "center_y": .5}
elevation: 4
shadow_softness: 8
shadow_offset: (-2, 2)
'''
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class Test(MDApp):
def build(self):
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/shadow-radius.png
:align: center
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.. note::
However, if you want to use this parameter, remember that the angle
values for the radius of the Kivy widgets and the radius for the shader
are different.
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.. code-block:: python
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shadow_radius = ['top-right', 'bot-right', 'top-left', 'bot-left']
kivy_radius = ['top-left', 'top-right', 'bottom-right', 'bottom-left']
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:attr:`shadow_radius` is an :class:`~kivy.properties.VariableListProperty`
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and defaults to `[0, 0, 0, 0]`.
"""
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shadow_softness = NumericProperty(12)
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"""
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Softness of the shadow.
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.. versionadded:: 1.1.0
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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
from kivymd.uix.behaviors import BackgroundColorBehavior, CommonElevationBehavior
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KV = '''
<RectangularElevationButton>
size_hint: None, None
size: "250dp", "50dp"
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MDScreen:
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RectangularElevationButton:
pos_hint: {"center_x": .5, "center_y": .6}
elevation: 6
shadow_softness: 6
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RectangularElevationButton:
pos_hint: {"center_x": .5, "center_y": .4}
elevation: 6
shadow_softness: 12
'''
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class RectangularElevationButton(CommonElevationBehavior, BackgroundColorBehavior):
md_bg_color = [0, 0, 1, 1]
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class Example(MDApp):
def build(self):
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/shadow-softness.png
:align: center
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:attr:`shadow_softness` is an :class:`~kivy.properties.NumericProperty`
and defaults to `12`.
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"""
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shadow_offset = ListProperty((0, 2))
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"""
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Offset of the shadow.
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.. versionadded:: 1.1.0
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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
from kivymd.uix.behaviors import BackgroundColorBehavior, CommonElevationBehavior
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KV = '''
<RectangularElevationButton>
size_hint: None, None
size: "100dp", "100dp"
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MDScreen:
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RectangularElevationButton:
pos_hint: {"center_x": .5, "center_y": .5}
elevation: 6
shadow_radius: 18
shadow_softness: 24
shadow_offset: 12, 12
'''
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class RectangularElevationButton(CommonElevationBehavior, BackgroundColorBehavior):
md_bg_color = [0, 0, 1, 1]
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class Example(MDApp):
def build(self):
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/shadow-offset-1.png
:align: center
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.. code-block:: kv
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RectangularElevationButton:
shadow_offset: -12, 12
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/shadow-offset-2.png
:align: center
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.. code-block:: kv
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RectangularElevationButton:
shadow_offset: -12, -12
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/shadow-offset-3.png
:align: center
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.. code-block:: kv
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RectangularElevationButton:
shadow_offset: 12, -12
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/shadow-offset-4.png
:align: center
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:attr:`shadow_offset` is an :class:`~kivy.properties.ListProperty`
and defaults to `(0, 2)`.
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"""
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shadow_color = ColorProperty([0, 0, 0, 0.6])
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"""
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Offset of the shadow.
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.. versionadded:: 1.1.0
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.. code-block:: python
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RectangularElevationButton:
shadow_color: 0, 0, 1, .8
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/shadow-color.png
:align: center
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:attr:`shadow_color` is an :class:`~kivy.properties.ColorProperty`
and defaults to `[0.4, 0.4, 0.4, 0.8]`.
"""
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_transition_ref = ObjectProperty()
_has_relative_position = BooleanProperty(defaultvalue=False)
_elevation = 0
_shadow_color = [0.0, 0.0, 0.0, 0.0]
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def _get_window_pos(self, *args):
window_pos = self.to_window(*self.pos)
# To list, so it can be compared to self.pos directly.
return [window_pos[0], window_pos[1]]
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def _set_window_pos(self, value):
self.window_pos = value
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window_pos = AliasProperty(_get_window_pos, _set_window_pos)
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def __init__(self, **kwargs):
super().__init__(**kwargs)
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if hasattr(MDApp.get_running_app(), "shaders_disabled") and MDApp.get_running_app().shaders_disabled:
self.shaders_disabled = True
else:
self.shaders_disabled = False
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with self.canvas.before:
self.context = RenderContext(use_parent_projection=True)
with self.context:
if self.shaders_disabled:
self.rect = None
del self.rect
else:
self.rect = RoundedRectangle(pos=self.pos, size=self.size)
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self.after_init()
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def after_init(self, *args):
Clock.schedule_once(self.check_for_relative_behavior)
if not self.shaders_disabled:
Clock.schedule_once(self.set_shader_string)
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Clock.schedule_once(lambda x: self.on_elevation(self, self.elevation))
self.on_pos()
def check_for_relative_behavior(self, *args) -> None:
"""
Checks if the widget has relative properties and if necessary
binds Window.on_draw and screen events to fix behavior
"""
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if self.pos != self.window_pos:
self._has_relative_position = True
# Loops to check if its inside screenmanager or bottom_navigation.
widget = self
while True:
# Checks if has screen event function
# works for Screen and MDTab objects.
if hasattr(widget, "on_pre_enter"):
widget.bind(on_pre_enter=self.apply_correction)
widget.bind(on_pre_leave=self.apply_correction)
widget.bind(on_enter=self.reset_correction)
widget.bind(on_leave=self.reset_correction)
self._has_relative_position = True
# Save refs to objects with transition property.
if hasattr(widget, "header"): # specific to bottom_nav
self._transition_ref = widget.header.panel
elif hasattr(widget, "manager"): # specific to screen
if widget.manager: # manager cant be None
self._transition_ref = widget.manager
break
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elif widget.parent and str(widget) != str(widget.parent):
widget = widget.parent
else:
break
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if self._has_relative_position:
Window.bind(on_draw=self.update_window_position)
def apply_correction(self, *args):
if self._transition_ref:
transition = str(self._transition_ref.transition)
# Slide and Card transitions only need _has_relative_pos to be
# always on.
if (
"SlideTransition" in transition
or "CardTransition" in transition
):
self.context.use_parent_modelview = False
else:
self.context.use_parent_modelview = True
def reset_correction(self, *args):
self.context.use_parent_modelview = False
self.update_window_position()
def get_shader_string(self) -> str:
shader_string = ""
for name_file in ["header.frag", "elevation.frag", "main.frag"]:
with open(
os.path.join(glsl_path, "elevation", name_file),
encoding="utf-8",
) as file:
shader_string += f"{file.read()}\n\n"
return shader_string
def set_shader_string(self, *args) -> None:
self.context["shadow_radius"] = list(map(float, self.shadow_radius))
self.context["shadow_softness"] = float(self.shadow_softness)
self.context["shadow_color"] = list(map(float, self.shadow_color))[
:-1
] + [float(self.opacity)]
self.context["pos"] = list(map(float, self.rect.pos))
self.context.shader.fs = self.get_shader_string()
def update_resolution(self) -> None:
self.context["resolution"] = (*self.rect.size, *self.rect.pos)
def on_shadow_color(self, instance, value) -> None:
def on_shadow_color(*args):
self._shadow_color = list(map(float, value))[:-1] + [
float(self.opacity) if not self.disabled else 0
]
self.context["shadow_color"] = self._shadow_color
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Clock.schedule_once(on_shadow_color)
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def on_shadow_radius(self, instance, value) -> None:
def on_shadow_radius(*args):
if hasattr(self, "context"):
self.context["shadow_radius"] = list(map(float, value))
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Clock.schedule_once(on_shadow_radius)
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def on_shadow_softness(self, instance, value) -> None:
def on_shadow_softness(*args):
if hasattr(self, "context"):
self.context["shadow_softness"] = float(value)
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Clock.schedule_once(on_shadow_softness)
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def on_elevation(self, instance, value) -> None:
def on_elevation(*args):
if hasattr(self, "context"):
self._elevation = value
self.hide_elevation(
True if (value <= 0 or self.disabled) else False
)
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Clock.schedule_once(on_elevation)
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def on_shadow_offset(self, instance, value) -> None:
self.on_size()
self.on_pos()
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def update_window_position(self, *args) -> None:
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"""
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This function is used only when the widget has relative position
properties.
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"""
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self.on_pos()
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def on_pos(self, *args) -> None:
if not hasattr(self, "rect"):
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return
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if (
self._has_relative_position
and not self.context.use_parent_modelview
):
pos = self.window_pos
else:
pos = self.pos
self.rect.pos = [
pos[0]
- ((self.rect.size[0] - self.width) / 2)
- self.shadow_offset[0],
pos[1]
- ((self.rect.size[1] - self.height) / 2)
- self.shadow_offset[1],
]
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self.context["mouse"] = [self.rect.pos[0], 0.0, 0.0, 0.0]
self.context["pos"] = list(map(float, self.rect.pos))
self.update_resolution()
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def on_size(self, *args) -> None:
if not hasattr(self, "rect"):
return
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# If the elevation value is 0, set the canvas size to zero.
# Because even with a zero elevation value, the shadow is displayed
# under the widget. This is visible if we change the scale
# of the widget.
width = self.size[0] if self.elevation else 0
height = self.size[1] if self.elevation else 0
self.rect.size = (
width + (self._elevation * self.shadow_softness / 2),
height + (self._elevation * self.shadow_softness / 2),
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)
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self.context["mouse"] = [self.rect.pos[0], 0.0, 0.0, 0.0]
self.context["size"] = list(map(float, self.rect.size))
self.update_resolution()
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def on_opacity(self, instance, value: int | float) -> None:
"""
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Adjusts the transparency of the shadow according to the transparency
of the widget.
"""
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def on_opacity(*args):
self._shadow_color = list(map(float, self._shadow_color))[:-1] + [
float(value)
]
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self.context["shadow_color"] = self._shadow_color
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super().on_opacity(instance, value)
Clock.schedule_once(on_opacity)
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def on_radius(self, instance, value) -> None:
self.shadow_radius = [value[1], value[2], value[0], value[3]]
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def on_disabled(self, instance, value) -> None:
if value:
self._elevation = 0
self.hide_elevation(True)
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else:
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self.hide_elevation(False)
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def hide_elevation(self, hide: bool) -> None:
if hide:
self._elevation = -self.elevation
self._shadow_color = [0.0, 0.0, 0.0, 0.0]
else:
self._elevation = self.elevation
self._shadow_color = self.shadow_color[:-1] + [float(self.opacity)]
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self.on_shadow_color(self, self._shadow_color)
self.on_size()
self.on_pos()
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class RectangularElevationBehavior(CommonElevationBehavior):
"""
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.. deprecated:: 1.1.0
Use :class:`~CommonElevationBehavior` class instead.
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"""
def __init__(self, **kwargs):
super().__init__(**kwargs)
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Logger.warning(
"KivyMD: "
"The `RectangularElevationBehavior` class has been deprecated. "
"Use the `CommonElevationBehavior` class instead.`"
)
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class CircularElevationBehavior(CommonElevationBehavior):
"""
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.. deprecated:: 1.1.0
Use :class:`~CommonElevationBehavior` class instead.
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"""
def __init__(self, **kwargs):
super().__init__(**kwargs)
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Logger.warning(
"KivyMD: "
"The `CircularElevationBehavior` class has been deprecated. "
"Use the `CommonElevationBehavior` class instead.`"
)
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class RoundedRectangularElevationBehavior(CommonElevationBehavior):
"""
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.. deprecated:: 1.1.0
Use :class:`~CommonElevationBehavior` class instead.
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"""
def __init__(self, **kwargs):
super().__init__(**kwargs)
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Logger.warning(
"KivyMD: "
"The `RoundedRectangularElevationBehavior` class has been "
"deprecated. Use the `CommonElevationBehavior` class instead.`"
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)
class FakeRectangularElevationBehavior(CommonElevationBehavior):
"""
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.. deprecated:: 1.1.0
Use :class:`~CommonElevationBehavior` class instead.
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"""
def __init__(self, **kwargs):
super().__init__(**kwargs)
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Logger.warning(
"KivyMD: "
"The `FakeRectangularElevationBehavior` class has been "
"deprecated. Use the `CommonElevationBehavior` class instead."
)
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class FakeCircularElevationBehavior(CommonElevationBehavior):
"""
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.. deprecated:: 1.1.0
Use :class:`~CommonElevationBehavior` class instead.
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"""
def __init__(self, **kwargs):
super().__init__(**kwargs)
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Logger.warning(
"KivyMD: "
"The `FakeCircularElevationBehavior` class has been deprecated. "
"Use the `CommonElevationBehavior` class instead."
)