Python使用.kv文件的Kivy中的弹出窗口小部件

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。

弹出窗口小部件：
要使用弹出窗口, 你必须导入：

from kivy.uix.popup import Popup

弹出窗口小部件用于创建弹出窗口。默认情况下, 弹出窗口将覆盖整个” 父” 窗口。创建弹出窗口时, 必须至少设置Popup.title和Popup.content。
【Python使用.kv文件的Kivy中的弹出窗口小部件】请记住, 小部件的默认大小为size_hint =(1, 1)。如果你不希望弹出窗口显示在全屏上, 则必须给出小于1的大小提示(例如size_hint =(。8, .8)), 或者停用size_hint并使用固定大小属性。
注意：弹出窗口是一个特殊的小部件。请勿尝试将其作为子级添加到任何其他小部件中。如果这样做, 将像处理普通小部件一样处理Popup, 并且不会将其隐藏在后台创建, 例如：

BoxLayout: MyPopup:# bad !

基本方法：

1) import kivy 2) import kivyApp 3) import Widget 4) import Floatlayout 5) import Label 6) import popup 7) Set minimum version(optional) 8) Create widget class 9) Create Layout class : 10) create App class 9) create .kv file (name same as the app class): 1) create Widget 2) create popup 3) Give label to popup 4) create button to close popup 10) return Layout/widget/Class(according to requirement) 11) define popup function(Which shows the popup on press the button) 12) Run an instance of the class

该方法的实施：
popup.py文件

# Kivy example for the Popup widget# 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' )# Widgets are elements of a graphical user # interface that form part of the User Experience. from kivy.uix.widget import Widget # The Label widget is for rendering text. from kivy.uix.label import Label# module consist the floatlayout # to work with FloatLayout first # you have to import it from kivy.uix.floatlayout import FloatLayout# 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# Creating a widget class # through this we add button # the commands of the class is in .kv file class Widgets(Widget): def btn( self ): # calling of the show popup function show_popup()# Popup class is defined # The command of the class is in .kv file class Popups(FloatLayout): pass# create App class class MyApp(App): def build( self ): # return the widget return Widgets()# define popup function in this we create the popup def show_popup(): show = Popups()popupWindow = Popup(title = "Popup Window" , content = show, size_hint = ( None , None ), size = ( 200 , 200 ))# open popup window popupWindow. open ()# Attach close button press with popup.dismiss action # content.bind(on_press = popup.dismiss)# run the App if __name__ = = "__main__" : MyApp().run()

.kv文件
实现

# .kv file of the popup code# Adding Button widget < Widgets> : Button: text: "Press me" on_release: root.btn()# Adding Label, Button to popup < Popups> :Label: text: "You pressed the button" size_hint: 0.6 , 0.2 pos_hint: { "x" : 0.2 , "top" : 1 }Button: text: "Close the popup" # set size of the button size_hint: 1 , 0.4 # set position of the button pos_hint: { "x" : 0 , "y" : 0.1 }

输出如下：
当出现按钮按下弹出窗口时, 请单击窗口中除弹出屏幕弹出窗口以外的其他任何地方, 都将消失：