Python| kivy中的进度条小部件

Kivy 是Python中一个独立于平台的 GUI 工具。因为它可以在Android、IOS、linux和Windows等平台上运行。它基本上是用来开发Android应用程序的，但这并不意味着它不能在桌面应用程序上使用。

👉🏽 Kivy Tutorial – Learn Kivy with Examples.

进度条小部件：

ProgressBar 小部件用于可视化某些任务的进度。当前仅支持水平模式：垂直模式尚不可用。
进度条没有交互元素，是一个仅显示的小部件。

要使用它，只需分配一个值来指示当前进度：

Python3

from kivy.uix.progressbar import ProgressBar
pb = ProgressBar(max = 1000)
  
# this will update the graphics automatically (75 % done)
pb.value = 750

To work with the progressbar widget you must have to import it by the command:

from kivy.uix.progressbar import ProgressBar

进度条需要两个参数：

1) max： value 允许的最大值。它是一个 Numeric 属性，默认为 100。
2) value：滑块的当前值

Basic Approach:

1) import kivy
2) import kivyApp
3) import progressbar
4) import Boxlayout(according to need)
5) Set minimum version(optional)
6) Create Layout class:
7) Create App class
8) return Layout/widget/Class(according to requirement)
9) Run an instance of the class

注意：此代码用于完整的工作进度条，您只需关注进度条的创建和工作，无需强调我将在未来介绍的其他属性。
您首先必须单击文件中的按钮，然后才会显示进度条。

方法的实施：

Python3

# Program to Show how to create a Progressbar in .kv file
  
# import kivy module    
import kivy  
       
# base Class of your App inherits from the App class.    
# app:always refers to the instance of your application   
from kivy.app import App 
     
# this restrict the kivy version i.e  
# below this kivy version you cannot  
# use the app or software  
kivy.require('1.9.0') 
    
# The ProgressBar widget is used to
# visualize the progress of some task
from kivy.uix.progressbar import ProgressBar 
  
# BoxLayout arranges children in a vertical or horizontal box. 
# or help to put the children at the desired location. 
from kivy.uix.boxlayout import BoxLayout
  
# The Clock object allows you to schedule a
# function call in the future
from kivy.clock import Clock
   
# The Button is a Label with associated actions 
# that is triggered when the button 
# is pressed (or released after a click / touch).  
from kivy.uix.button import Button
  
# Popup widget is used to create popups. 
# By default, the popup will cover 
# the whole “parent” window. 
# When you are creating a popup, 
# you must at least set a Popup.title and Popup.content.
from kivy.uix.popup import Popup
  
# A Widget is the base building block
# of GUI interfaces in Kivy.
# It provides a Canvas that
# can be used to draw on screen.
from kivy.uix.widget import Widget
  
# ObjectProperty is a specialised sub-class
# of the Property class, so it has the same
# initialisation parameters as it:
# By default, a Property always takes a default
# value[.] The default value must be a value
# that agrees with the Property type.
from kivy.properties import ObjectProperty
  
  
  
# Create the widget class
class MyWidget(Widget):
  
    progress_bar = ObjectProperty()
      
    def __init__(self, **kwa):
        super(MyWidget, self).__init__(**kwa)
          
        self.progress_bar = ProgressBar()
        self.popup = Popup(
            title ='Download',
            content = self.progress_bar
        )
        self.popup.bind(on_open = self.puopen)
        self.add_widget(Button(text ='Download', on_release = self.pop))
  
    # the function which works when you click = k the button 
    def pop(self, instance):
        self.progress_bar.value = 1
        self.popup.open()
  
    # To continuously increasing the value of pb.
    def next(self, dt):
        if self.progress_bar.value>= 100:
            return False
        self.progress_bar.value += 1
      
    def puopen(self, instance):
        Clock.schedule_interval(self.next, 1 / 25)
  
# Create the App class 
class MyApp(App):
    def build(self):
        return MyWidget()
  
# run the App
if __name__ in ("__main__"):
    MyApp().run()
  

输出：

图 1：

图 2：

在评论中写代码？请使用 ide.geeksforgeeks.org，生成链接并在此处分享链接。