Python Kivy中的微调小部件用法示例 _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。

微调小部件：
要使用微调器, 你必须导入：

from kivy.uix.spinner import Spinner

Spinner是一个小部件, 提供了一种从一组中选择一个值的快速方法。在默认状态下, 微调器显示其当前选定的值。触摸微调器会显示一个下拉菜单, 其中包含所有其他可用值, 用户可以从中选择一个新值。
像组合框一样, 微调器对象可以具有多个值, 并且可以选择一个值。
回调可以附加到微调器对象上, 以接收有关从微调器对象选择值的通知。

Basic Approach :1) import kivy 2) import kivyApp 3) import Label 4) import Spinner 5) import Floatlayout 6) Set minimum version(optional) 7) create App class: 1) Create the spinner 2) Attach the labels to spinners 3) Attach a callback also 8) return Layout/widget/Class(according to requirement) 9) Run an instance of the class

一个简单的微调器的实现：

# Sample spinner app in kivy to change the # kivy default settings we use this module config from kivy.config import Config# 0 being off 1 being on as in true /false # you can use 0 or 1 & & True or False Config. set ( 'graphics' , 'resizable' , True )# Program to Show how to create a switch # 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# Spinner is a widget that provides a # quick way to select one value from a set. # like a dropdown list from kivy.uix.spinner import Spinner# module consist the floatlayout # to work with FloatLayout first # you have to import it from kivy.uix.floatlayout import FloatLayout# Make an App by deriving from the App class class SpinnerExample(App):# define build def build( self ):# creating floatlayout layout = FloatLayout()# creating the spinner # configure spinner object and add to layout self .spinnerObject = Spinner(text = "Python" , values = ( "Python" , "Java" , "C++" , "C" , "C#" , "PHP" ), background_color = ( 0.784 , 0.443 , 0.216 , 1 )) self .spinnerObject.size_hint = ( 0.3 , 0.2 )self .spinnerObject.pos_hint = { 'x' : . 35 , 'y' :. 75 }layout.add_widget( self .spinnerObject)# return the layout return layout; # Run the app if __name__ = = '__main__' : SpinnerExample().run()

输出如下：
图片1

文章图片
图片2：

文章图片
现在, 如果每次都要告诉用户选择列表中的哪个元素, 我们将在微调器旁边显示一个标签, 告诉你所选择的标签。另外, 我们将打印值和微调框的文本。
下面是实现：

# Sample spinner app in kivy to change the # kivy default settings we use this module config from kivy.config import Config# 0 being off 1 being on as in true /false # you can use 0 or 1 & & True or False Config. set ( 'graphics' , 'resizable' , True )# Program to Show how to create a switch # 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# Spinner is a widget that provides a # quick way to select one value from a set. # like a dropdown list from kivy.uix.spinner import Spinner# module consist the floatlayout # to work with FloatLayout first # you have to import it from kivy.uix.floatlayout import FloatLayout# Make an App by deriving from the App class class SpinnerExample(App):# define build def build( self ):# creating floatlayout layout = FloatLayout()# creating the spinner # configure spinner object and add to layout self .spinnerObject = Spinner(text = "Python" , values = ( "Python" , "Java" , "C++" , "C" , "C#" , "PHP" ), background_color = ( 0.784 , 0.443 , 0.216 , 1 )) self .spinnerObject.size_hint = ( 0.3 , 0.2 )self .spinnerObject.pos_hint = { 'x' : . 35 , 'y' :. 75 }layout.add_widget( self .spinnerObject) self .spinnerObject.bind(text = self .on_spinner_select)# It changes the label info as well # add a label displaying the selection from the spinner self .spinnerSelection = Label(text = "Selected value in spinner is: %s" % self .spinnerObject.text)layout.add_widget( self .spinnerSelection) self .spinnerSelection.pos_hint = { 'x' : . 1 , 'y' :. 3 }return layout; # call back for the selection in spinner object def on_spinner_select( self , spinner, text): self .spinnerSelection.text = "Selected value in spinner is: %s" % self .spinnerObject.text)print ( 'The spinner' , spinner, 'have text' , text)# Run the app if __name__ = = '__main__' : SpinnerExample().run()

输出如下：
图片1