如何在kivy中使用阻塞MessgeBox

Question

我有一個Kivy應用程序。

從主GUI中，我想打開一個新的消息框並強制主GUI等待操作框交互的結果。

我看到Qt4消息框支持這種阻塞調用類型，但我還沒有在Kivy中找到等價的功能。這種功能是否存在？

Answer 1

彈出窗口小部件用於創建模式彈出窗口。默認情況下，彈出窗口將覆蓋整個「父窗口」。當你創建一個彈出窗口時，你必須至少設置一個Popup.title和一個Popup.content小部件。

模裝置阻止:)

http://kivy.org/docs/api-kivy.uix.popup.html

Answer 2

下面的代碼片段，其沒有工作，雖然它實際上是沒有真正阻擋。 您需要定義一個或兩個替代方案才能繼續使用 程序。這是僞阻塞技巧。

import kivy 
from kivy.uix.popup import Popup 
from kivy.uix.button import Button 
from kivy.uix.gridlayout import GridLayout 
from kivy.uix.boxlayout import BoxLayout 
from kivy.uix.label import Label 
from kivy.app import App 

class MessageBoxApp(App): 

    def build(self): 
     return Button(text='Press for MessageBox!', on_press=self.callpopup) 

    def callpopup(self, event): 
     dlg = MessageBox(self, titleheader="Title Header", message="Any Message", 
     options={"YES": "printyes()", "NO": "printno()", "CANCEL": ""}) 
     print "Messagebox shows as kivy popup and we wait for the user action" 

    def printyes(self): 
     # routine for going yes 
     print "You chose the Yes routine" 

    def printno(self): 
     # routine for going no 
     print "You chose the No routine" 

class MessageBox(MessageBoxApp): 
    def __init__(self, parent, titleheader="Title", message="Message", options={"OK": ""}, size=(400, 400)): 

     def popup_callback(instance): 
      "callback for button press" 
      self.retvalue = instance.text 
      self.popup.dismiss() 

     self.parent = parent 
     self.retvalue = None 
     self.titleheader = titleheader 
     self.message = message 
     self.options = options 
     self.size = size 
     box = GridLayout(orientation='vertical', cols=1) 
     box.add_widget(Label(text=self.message, font_size=16)) 
     b_list = [] 
     buttonbox = BoxLayout(orientation='horizontal') 
     for b in self.options: 
      b_list.append(Button(text=b, size_hint=(1,.35), font_size=20)) 
      b_list[-1].bind(on_press=popup_callback) 
      buttonbox.add_widget(b_list[-1]) 
     box.add_widget(buttonbox) 
     self.popup = Popup(title=titleheader, content=box, size_hint=(None, None), size=self.size) 
     self.popup.open() 
     self.popup.bind(on_dismiss=self.OnClose) 

    def OnClose(self, event): 
     self.popup.unbind(on_dismiss=self.OnClose) 
     self.popup.dismiss() 
     if self.retvalue != None and self.options[self.retvalue] != "": 
      command = "self.parent."+self.options[self.retvalue] 
      exec command 

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