Button — Kivy 2.3.0 documentation
Button¶
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Module: kivy.uix.button
Added in 1.0.0
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, the same properties (padding, font_size, etc) and sizing system are used as for the Label class:
按钮（Button）是一个带有相关动作的标签（Label），这些动作在按钮被按下（或点击/触摸后释放）时触发。为了配置按钮，我们使用了与标签（Label）类相同的属性（如内边距padding、字体大小font_size等）和尺寸系统。
button = Button(text='Hello world', font_size=14)To attach a callback when the button is pressed (clicked/touched), use bind:
当按钮被按下（点击/触摸）时，要附加一个回调函数，可以使用bind方法。
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:
如果你想要在每次按钮状态发生变化时都收到通知，你可以将事件绑定到Button.state属性上：
def callback(instance, value):print('My button <%s> state is <%s>' % (instance, value))
btn1 = Button(text='Hello world 1')
btn1.bind(state=callback)Kv Example:
Button:text: 'press me'on_press: print("ouch! More gently please")on_release: print("ahhh")on_state:print("my current state is {}".format(self.state))APIHide Description ⇑
class kivy.uix.button.Button(**kwargs)¶
Bases: kivy.uix.behaviors.button.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). 背景颜色，格式为(r, g, b, a)。
This acts as a multiplier to the texture color. The default texture is grey, so just setting the background color will give a darker result. To set a plain color, set the background_normal to ''.
它作为纹理颜色的一个乘数因子。默认纹理是灰色的，所以仅仅设置背景颜色会得到一个更暗的结果。要设置纯色，请将background_normal属性设置为空字符串（''）。
New in version 1.0.8. 此功能在版本1.0.8中新增。
The background_color is a ColorProperty and defaults to [1, 1, 1, 1].background_color是一个ColorProperty，其默认值为[1, 1, 1, 1]（即白色，完全不透明）。
Changed in version 2.0.0: Changed from ListProperty to ColorProperty.
在版本2.0.0中更改：从ListProperty更改为ColorProperty。
background_disabled_down¶
Background image of the button used for the default graphical representation when the button is disabled and pressed.
New in version 1.8.0.
background_disabled_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 disabled and not pressed.
按钮的背景图像，用于在按钮被禁用且被按下时的默认图形表示。
New in version 1.8.0. 此功能在版本1.8.0中新增。
background_disabled_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.
按钮的背景图像，用于按钮被按下时的默认图形表示。
New in version 1.0.4. 此功能在版本1.0.4中新增。
background_down is a StringProperty and defaults to ‘atlas://data/images/defaulttheme/button_pressed’.background_disabled_down是一个StringProperty，其默认值为'atlas://data/images/defaulttheme/button_disabled_pressed'。
background_normal¶
Background image of the button used for the default graphical representation when the button is not pressed.
按钮的背景图像，用于按钮未被按下时的默认图形表示。
New in version 1.0.4. 此功能在版本1.0.4中新增。
background_normal is a StringProperty and defaults to ‘atlas://data/images/defaulttheme/button’.background_normal是一个StringProperty，其默认值为 '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.
边框，用于BorderImage图形指令。与background_normal和background_down一起使用。可用于自定义背景。
It must be a list of four values: (bottom, right, top, left). Read the BorderImage instruction for more information about how to use it.
它必须是一个包含四个值的列表：(底部, 右侧, 顶部, 左侧)。要获取更多关于如何使用它的信息，请阅读BorderImage指令的说明。
border is a ListProperty and defaults to (16, 16, 16, 16)border是一个ListProperty，其默认值为(16, 16, 16, 16)。
