禁用 Kivy 按钮
在这篇文章中，我们将学习如何禁用 kivy 中的一个按钮，有些地方我们需要禁用按钮，所以在这篇文章中，你将学习如何做到这一点。
按钮是一个带有相关动作的标签，当按钮被按下(或在点击/触摸后被释放)时会被触发。我们可以在按钮后面添加功能，并为按钮设置样式。但是要禁用该按钮，我们有一个属性名:
disabled that must be true
该属性将有助于禁用按钮，即按钮将会存在，但没有用，因为它被禁用，按钮的任何功能都将不起作用。
注意: 禁用属性在 1.8.0 版本中引入。如果你想使用它，你需要实现你的框架。
创建和禁用按钮时要遵循的基本方法:
->导入 kivy - >导入 kivy App - >导入按钮 - >设置最低版本(可选) - >扩展类 - >添加并返回一个按钮 - >添加禁用=真禁用按钮 - >运行类的一个实例
首先，让我们看看如何创建一个完全工作的按钮，然后看看如何禁用它及其功能。
Code #1: How to create fully working button
def build(self):
# use a (r, g, b, a) tuple
btn = Button(text ="Push Me !",
font_size ="20sp",
background_color =(1, 1, 1, 1),
color =(1, 1, 1, 1),
size =(32, 32),
size_hint =(.2, .2),
pos =(300, 250))
return btn
输出:
代码#2:如何禁用按钮
def build(self):
# use a (r, g, b, a) tuple
btn = Button(text ="Push Me !",
font_size ="20sp",
background_color =(1, 4, 6, 1),
color =(1, 1, 1, 1),
size =(32, 32),
size_hint =(.2, .2),
pos =(300, 250),
# Disabling the button
disabled = True
)
输出:
代码#3:两个禁用和工作按钮一起
# import kivy module
import kivy
# this restrict the kivy version i.e
# below this kivy version you cannot
# use the app or software
kivy.require("1.9.1")
# base Class of your App inherits from the App class.
# app:always refers to the instance of your application
from kivy.app import App
# creates the button in kivy
# if not imported shows the error
from kivy.uix.button import Button
# This layout allows you to set relative coordinates for children.
from kivy.uix.relativelayout import RelativeLayout
# class in which we are creating the button
class ButtonApp(App):
def build(self):
r1 = RelativeLayout()
# working button
btn1 = Button(text ="Push Me !",
font_size ="20sp",
background_color =(1, 1, 1, 1),
color =(1, 1, 1, 1),
size =(32, 32),
size_hint =(.2, .2),
pos =(200, 250))
# disabled button
btn2 = Button(text ="Disabled:(:( !",
font_size ="20sp",
background_color =(1, 1, 1, 1),
color =(1, 1, 1, 1),
size =(32, 32),
size_hint =(.2, .2),
pos =(500, 250),
# Add disabled property true to disabled button
disabled = True)
r1.add_widget(btn1)
r1.add_widget(btn2)
# bind() use to bind the button to function callback
btn1.bind(on_press = self.callback)
return r1
# callback function tells when button pressed
def callback(self, event):
print("button pressed")
print('Yoooo !!!!!!!!!!!')
# creating the object root for ButtonApp() class
root = ButtonApp()
# run function runs the whole program
# i.e run() method which calls the target
# function passed to the constructor.
root.run()
输出:
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