Python使用.kv文件的Kivy中的Progressbar小部件 _Kivy

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 inkv 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：