如何在Kivy应用程序退出时运行方法 [英] How to run a Method on the exit of a kivy app

问题描述

当用户尝试退出应用程序时，我想运行一个方法，类似于无论您确定要退出"还是是否要保存文件"类型的消息，只要用户尝试点击窗口顶部的退出按钮退出

I would like to run a Method when the user tries to exit the app , kind of like a "are you sure you want to exit" or "Do you want to save the file" type of message whenever the user tries to exit by clicking the Exit button on top of the window

类似 on_quit: app.root.saveSession()

推荐答案

如果您希望您的应用程序在GUI关闭后直接运行，则最简单，最小的方法是将任何退出代码放在TestApp().run()之后. run()创建一个无限循环，该循环还清除了kivy中的所有事件数据，因此不会挂起. window/gui实例死亡后，该无限循环就会中断.因此，之后的任何代码也将仅在GUI死后执行.

If you want your application to simply run things after the GUI has closed, the easiest and smallest approach would be to place any exit code after TestApp().run(). run() creates a endless loop which also clears any event-data from within kivy so it doesn't hang. That endless loop breaks as soon as the window/gui instance dies. So there for, any code after will execute only after the GUI dies too.

如果您想通过关闭套接字事件或弹出窗口询问用户是否确实是他们真正想做的事情来创建GUI的正常关闭方式，那么可以为on_request_close事件创建一个钩子:

If you want to create a graceful shutdown of the GUI with for instance socket-closing events or a popup asking the user if that's what they really want to do, then creating a hook for the on_request_close event is the way to go:

from kivy.config import Config
Config.set('kivy', 'exit_on_escape', '0')

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.popup import Popup
from kivy.core.window import Window


class ChildApp(App):

    def build(self):
        Window.bind(on_request_close=self.on_request_close)
        return Label(text='Child')

    def on_request_close(self, *args):
        self.textpopup(title='Exit', text='Are you sure?')
        return True

    def textpopup(self, title='', text=''):
        """Open the pop-up with the name.

        :param title: title of the pop-up to open
        :type title: str
        :param text: main text of the pop-up to open
        :type text: str
        :rtype: None
        """
        box = BoxLayout(orientation='vertical')
        box.add_widget(Label(text=text))
        mybutton = Button(text='OK', size_hint=(1, 0.25))
        box.add_widget(mybutton)
        popup = Popup(title=title, content=box, size_hint=(None, None), size=(600, 300))
        mybutton.bind(on_release=self.stop)
        popup.open()


if __name__ == '__main__':
    ChildApp().run()

由创建 pythonic64 提供在问题的主题上="=" noreferrer>要点

Courtesy of pythonic64 who created a gist on the topic in a issue way back when.

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