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Source code for kivy.uix.button

'''
Button
======

.. image:: images/button.jpg
    :align: right

The :class:`Button` is a :class:`~kivy.uix.label.Label` with associated actions
that are triggered when the button is pressed (or released after a
click/touch). To configure the button, the same properties (padding,
font_size, etc) and
:ref:`sizing system <kivy-uix-label-sizing-and-text-content>`
are used as for the :class:`~kivy.uix.label.Label` class::

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

To attach a callback when the button is pressed (clicked/touched), use
:class:`~kivy.uix.widget.Widget.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 :attr:`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)

'''

__all__ = ('Button', )

from kivy.uix.label import Label
from kivy.properties import StringProperty, ListProperty
from kivy.uix.behaviors import ButtonBehavior


[docs]class Button(ButtonBehavior, Label): '''Button class, see module documentation for more information. .. versionchanged:: 1.8.0 The behavior / logic of the button has been moved to :class:`~kivy.uix.behaviors.ButtonBehaviors`. ''' background_color = ListProperty([1, 1, 1, 1]) '''Background color, in the format (r, g, b, a). This acts as a *multiplier* to the texture colour. The default texture is grey, so just setting the background color will give a darker result. To set a plain color, set the :attr:`background_normal` to ``''``. .. versionadded:: 1.0.8 The :attr:`background_color` is a :class:`~kivy.properties.ListProperty` and defaults to [1, 1, 1, 1]. ''' background_normal = StringProperty( 'atlas://data/images/defaulttheme/button') '''Background image of the button used for the default graphical representation when the button is not pressed. .. versionadded:: 1.0.4 :attr:`background_normal` is a :class:`~kivy.properties.StringProperty` and defaults to 'atlas://data/images/defaulttheme/button'. ''' background_down = StringProperty( 'atlas://data/images/defaulttheme/button_pressed') '''Background image of the button used for the default graphical representation when the button is pressed. .. versionadded:: 1.0.4 :attr:`background_down` is a :class:`~kivy.properties.StringProperty` and defaults to 'atlas://data/images/defaulttheme/button_pressed'. ''' background_disabled_normal = StringProperty( 'atlas://data/images/defaulttheme/button_disabled') '''Background image of the button used for the default graphical representation when the button is disabled and not pressed. .. versionadded:: 1.8.0 :attr:`background_disabled_normal` is a :class:`~kivy.properties.StringProperty` and defaults to 'atlas://data/images/defaulttheme/button_disabled'. ''' background_disabled_down = StringProperty( 'atlas://data/images/defaulttheme/button_disabled_pressed') '''Background image of the button used for the default graphical representation when the button is disabled and pressed. .. versionadded:: 1.8.0 :attr:`background_disabled_down` is a :class:`~kivy.properties.StringProperty` and defaults to 'atlas://data/images/defaulttheme/button_disabled_pressed'. ''' border = ListProperty([16, 16, 16, 16]) '''Border used for :class:`~kivy.graphics.vertex_instructions.BorderImage` graphics instruction. Used with :attr:`background_normal` and :attr:`background_down`. Can be used for custom backgrounds. It must be a list of four values: (bottom, right, top, left). Read the BorderImage instruction for more information about how to use it. :attr:`border` is a :class:`~kivy.properties.ListProperty` and defaults to (16, 16, 16, 16) '''