Re: Bug in wxPython? MessageDialog.ShowModal() returning always zero on OS X

Thanks for the answers. As I am new to wxPython. I looked at the 
CallAfter(). It seemst work as expected. But I need to switch code in my 
thread based on the dialog result. How can I do that? 

Here is some code (I modified the CallAfter() example found at 
http://wiki.wxpython.org/CallAfter a bit): 

import threading,wx
 
ID_RUN=101
ID_RUN2=102
 class MyFrame(wx.Frame):
    def __init__(self, parent, ID, title):
        wx.Frame.__init__(self, parent, ID, title)
        panel = wx.Panel(self, -1)
        mainSizer=wx.BoxSizer(wx.HORIZONTAL)
        mainSizer.Add(wx.Button(panel, ID_RUN, "Button 1"))
        mainSizer.Add(wx.Button(panel, ID_RUN2, "Button 2"))
        panel.SetSizer(mainSizer)
        mainSizer.Fit(self)
        wx.EVT_BUTTON(self, ID_RUN, self.onClick1)
        wx.EVT_BUTTON(self, ID_RUN2, self.onClick2)
 
    def onClick1(self,event):
        print "Clicked button 1"
        wx.CallAfter(self.ShowDialog, "I don't appear until after onClick1 exits")        
        s=raw_input("Enter something:")
        print s
 
    def onClick2(self,event):
        print "Clicked button 2"
        t=threading.Thread(target=self.__run)
        t.start()
        #how to use message dialog result here?
 
    def __run(self):
        wx.CallAfter(self.ShowDialog, "I appear immediately (event handler\nexited when onClick2 finished)")        
        s=raw_input("Enter something in this thread:")
        print s        
 
    def ShowDialog(self,msg):
        dlg=wx.MessageDialog(self, msg, "Called after", wx.YES_NO|wx.ICON_INFORMATION)
        result = dlg.ShowModal()
        #how to pass result to calling funtion?
        dlg.Destroy()        
 
 class MyApp(wx.App):
    def OnInit(self):
        frame = MyFrame(None, -1, "CallAfter demo")
        frame.Show(True)
        frame.Centre()
        return True
 
app = MyApp(0)
app.MainLoop() 


keskiviikko 13. toukokuuta 2015 18.49.58 UTC+3 kevino kirjoitti:
>
>
> On May 13, 2015, at 8:21 AM, Robin Dunn <[email protected] <javascript:>> 
> wrote: 
>
> > Jari Nevala wrote: 
> >> Hi, 
> >> 
> >> I noticed recently that when a MessageDialog is created in a thread and 
> >> its ShowModal() is called, it always returns 0 on OS X. This is an 
> >> error, because it should return the wx.ID of the button pressed. On 
> >> Windows this does not happen. 
> >> 
> >> When the MessageDialog is created in the main thread, the ShowModal() 
> >> returns correct value on OS X and PC. 
> >> 
> >> The Mac I used to reproduce this problem is Macbook Air with OS X 
> >> version 10.9.5. wxPython version is 3.0.2.0. My PC is running Windowsx 
> >> 8.1 and also has wxPython 3.0.2.0 installed. 
> >> 
> >> Below is code to reproduce the problem. See the comments. 
> >> Code also available in pastebin: http://pastebin.com/QbNkw5gz 
> >> 
> >> So is this a bug in wxPython? 
> > 
> > It's a known issue, but it only happens with stock dialogs shown before 
> the MainLoop starts.  So the easy fix is to just move that code to a method 
> and use wx.CallAfter or wx.CallLater in OnInit to invoke it right after the 
> MainLoop starts processing events. 
>
> Also, it's important to note that Cocoa, and GUI libraries in general, are 
> not thread-safe. On Mac there is a further restriction that the GUI must be 
> started from the app's main thread. So the best practice is that you start 
> the main loop in the main thread, and any time you want to call GUI code 
> from a thread, as you do in the testThread method, you need to use 
> wx.CallAfter or wx.CallLater to run the GUI code to ensure it runs in the 
> main thread. 
>
> Regards, 
>
> Kevin 
>
> > -- 
> > Robin Dunn 
> > Software Craftsman 
> > http://wxPython.org 
> > 
> > -- 
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