禁用 Kivy 按钮

在本文中，我们将学习如何禁用 kivy 中的按钮，有些地方我们需要禁用按钮所以在本文中，您将学习如何做到这一点。

Kivy Tutorial – Learn Kivy with Examples.

Button是一个具有关联操作的标签，这些操作在按下按钮时触发（或在单击/触摸后释放）。我们可以在按钮后面添加功能并设置按钮样式。但是要禁用按钮，我们有一个属性名称：

disabled that must be true

此属性将有助于禁用按钮，即按钮将在那里，但没有用，因为它被禁用，按钮的任何功能都将不起作用。

Note: disabled property was introduced in version 1.8.0. If you want to use it you need to actualize your framework.

编程需要懂一点英语

Basic Approach to follow while creating and disabling button :

-> import kivy
-> import kivy App
-> import button
-> set minimum version(optional)
-> Extend the class
-> Add and return a button
-> Add disabled = true to disable button
-> Run an instance of the class

编程需要懂一点英语

首先，让我们看看如何创建一个完全正常工作的按钮，然后看看如何禁用它及其功能。

代码 #1：如何创建完全正常工作的按钮

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：同时禁用和工作按钮

# 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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