Python使用.kv文件的Kivy中的Progressbar小部件

Kivy是Python中与平台无关的GUI工具。由于它可以在Android, IOS, Linux和Windows等操作系统上运行。它基本上是用于开发Android应用程序, 但这并不意味着它不能在桌面应用程序上使用。

??Kivy教程–通过示例学习Kivy。

进度栏小部件：

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。进度栏没有交互元素, 并且是仅用于显示的窗口小部件。

要使用Progressbar小部件, 你必须通过以下命令将其导入：从kivy.uix.progressbar import ProgressBar

进度条采用两个参数：

1)max：允许的最大值。它是一个数值属性, 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) Create .kv file:
         1) Add progress bar
         2) Add label
         3) Add canvas if you want as i did
8) return Layout/widget/Class(according to requirement)
9) Run an instance of the class

该方法的实施：

.py文件

# 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 Label widget is for rendering text.  
from kivy.uix.label import Label 
    
# 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 class whose internal work is in  kv file
class ProgBar(BoxLayout):
     pass
  
# Create the App Class   
class mainApp(App):
     def build( self ):
         return ProgBar()
  
# Create the run
if __name__ = = '__main__' :
     mainApp().run()

.kv文件

# .kv file
  
# Extension of ProgBar class in .kv file
<ProgBar>:
  
     orientation: 'vertical'
     # Creating the background of the App
     canvas:
         Color:
             rgb: . 45 , . 28 , . 5
         Rectangle:
             pos: self .pos
             size: self .size
  
     # Providing label to the pg bar
     Label:
         text: '[size = 40px]Progress Bar 1 (at .25)'
         color: . 5 , 0 , . 5 , 1
         markup: True
  
     # Creating thepg bar of specific value
     ProgressBar:
         value: . 25
         min : 0
         max : 1
         pos_hint: { 'x' :. 1 }
         size_hint_x: . 8
  
     # Providing label to the pg bar
     Label:
         text: '[size = 40px]Progress Bar 2 (at .55)'
         color: . 5 , 0 , . 5 , 1
         markup: True
  
     # Creating thepg bar of specific value
     ProgressBar:
         value: . 55
         min : 0
         max : 1
         pos_hint: { 'x' :. 1 }
         size_hint_x: . 8

输出如下：

首先, 你的面试准备可通过以下方式增强你的数据结构概念：Python DS课程。