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Button

_images/button.jpg

The Button is a Label with associated actions that are triggered when the button is pressed (or released after a click/touch). To configure the button, you can use the same properties that you can use for the Label class:

button = Button(text='Hello world', font_size=14)

To attach a callback when the button is pressed (clicked/touched), use bind:

def callback(instance):
    print('The button <%s> is being pressed' % instance.text)

btn1 = Button(text='Hello world 1')
btn1.bind(on_press=callback)
btn2 = Button(text='Hello world 2')
btn2.bind(on_press=callback)

If you want to be notified every time the button state changes, you can bind to the Button.state property:

def callback(instance, value):
    print('My button <%s> state is <%s>' % (instance, value))
btn1 = Button(text='Hello world 1')
btn1.bind(state=callback)
class kivy.uix.button.Button(**kwargs)[source]

Bases: kivy.uix.behaviors.ButtonBehavior, kivy.uix.label.Label

Button class, see module documentation for more information.

Changed in version 1.8.0: The behavior / logic of the button has been moved to ButtonBehaviors.

background_color

Background color, in the format (r, g, b, a).

New in version 1.0.8.

The background_color is a ListProperty and defaults to [1, 1, 1, 1].

background_disabled_down

Background image of the button used for the default graphical representation when the button is pressed.

New in version 1.8.0.

background_down is a StringProperty and defaults to ‘atlas://data/images/defaulttheme/button_disabled_pressed’.

background_disabled_normal

Background image of the button used for the default graphical representation when the button is not pressed.

New in version 1.8.0.

background_normal is a StringProperty and defaults to ‘atlas://data/images/defaulttheme/button_disabled’.

background_down

Background image of the button used for the default graphical representation when the button is pressed.

New in version 1.0.4.

background_down is a StringProperty and defaults to ‘atlas://data/images/defaulttheme/button_pressed’.

background_normal

Background image of the button used for the default graphical representation when the button is not pressed.

New in version 1.0.4.

background_normal is a StringProperty and defaults to ‘atlas://data/images/defaulttheme/button’.

border

Border used for BorderImage graphics instruction. Used with background_normal and background_down. Can be used for custom backgrounds.

It must be a list of four values: (top, right, bottom, left). Read the BorderImage instruction for more information about how to use it.

border is a ListProperty and defaults to (16, 16, 16, 16)