python - Kivy 打开两个弹出窗口，而我只期望一个

Question

因此，我一直在尝试在 Kivy 上打开一个弹出窗口，并在按下 Escape 时将其关闭。但是我发现自己不得不按两次，然后我发现它打开了两个弹出窗口。

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

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

class KeyDown(App):
    def build(self):
        self.popup_exists = 0
        Window.bind(on_key_down=self.key_action)
        return Widget()

    def key_action(self, *args):
        key1 = args[1]
        key2 = args[2]
        special_keys = args[4]
        letter = args[3]

        if special_keys == ['ctrl'] and letter == 'f':                          # Ctrl-F
            print('Find')
            self.open_find_dialog()
        if key1 == 13 and key2 == 40 and self.popup_exists == 1:                # ENTER KEY
            pass
        if key1 == 27 and key2 == 41 and self.popup_exists == 1:    # ESC
            self.find_window.dismiss()

    def open_find_dialog(self):
        content = BoxLayout(orientation='horizontal')
        col1_cont = BoxLayout(size_hint_x = 2,orientation = 'vertical')
        col2_cont = BoxLayout(size_hint_x = 4,orientation = 'vertical')
        find_labl = Label(text='Find',size_hint_y=None, height = 40)
        repl_labl = Label(text='Replace',size_hint_y=None, height = 40)

        find_text = TextInput(text='', size_hint_y = None, height = 40)
        repl_text = TextInput(text='', size_hint_y = None, height = 40)
        col1_cont.add_widget(find_labl)
        col1_cont.add_widget(repl_labl)
        col2_cont.add_widget(find_text)
        col2_cont.add_widget(repl_text)

        content.add_widget(col1_cont)
        content.add_widget(col2_cont)
        self.find_window = Popup(title='Find and Replace',content = content,size_hint=(None, None), size=(240, 140))
        self.find_window.open()
        self.popup_exists = 1
if __name__ == '__main__':
    KeyDown().run()

有谁知道它为什么会打开两个弹出窗口？我将如何阻止它这样做？

标签： pythonuser-interfacekivy