Scale#

#

Added in version 1.1.0.

Base class for controlling the scale of the widget.

Note

See kivy.graphics.Rotate for more information.

Kivy#

from kivy.animation import Animation
from kivy.lang import Builder
from kivy.properties import NumericProperty
from kivy.uix.button import Button
from kivy.app import App


KV = '''
Screen:

    ScaleButton:
        size_hint: .5, .5
        pos_hint: {"center_x": .5, "center_y": .5}
        on_release: app.change_scale(self)

        canvas.before:
            PushMatrix
            Scale:
                x: self.scale_value_x
                y: self.scale_value_y
                z: self.scale_value_x
                origin: self.center
        canvas.after:
            PopMatrix
'''


class ScaleButton(Button):
    scale_value_x = NumericProperty(1)
    scale_value_y = NumericProperty(1)
    scale_value_z = NumericProperty(1)


class Test(App):
    def build(self):
        return Builder.load_string(KV)

    def change_scale(self, instance_button: Button) -> None:
        Animation(
            scale_value_x=0.5,
            scale_value_y=0.5,
            scale_value_z=0.5,
            d=0.3,
        ).start(instance_button)


Test().run()

KivyMD#

from kivy.animation import Animation
from kivy.lang import Builder
from kivy.uix.behaviors import ButtonBehavior

from kivymd.app import MDApp
from kivymd.uix.behaviors import ScaleBehavior
from kivymd.uix.boxlayout import MDBoxLayout

KV = '''
MDScreen:

    ScaleBox:
        size_hint: .5, .5
        pos_hint: {"center_x": .5, "center_y": .5}
        on_release: app.change_scale(self)
        md_bg_color: "red"
'''


class ScaleBox(ButtonBehavior, ScaleBehavior, MDBoxLayout):
    pass


class Test(MDApp):
    def build(self):
        return Builder.load_string(KV)

    def change_scale(self, instance_button: ScaleBox) -> None:
        Animation(
            scale_value_x=0.5,
            scale_value_y=0.5,
            scale_value_z=0.5,
            d=0.3,
        ).start(instance_button)


Test().run()

Warning

Do not use ScaleBehavior class with classes that inherited` from CommonElevationBehavior class. CommonElevationBehavior classes by default contains attributes for scale widget.