We are working on bringing our application up to date with wxPython 3.0.2, however this is one of two major bugs that is still around in our code. I’m using OSX 10.10 to test with.
Background on example: on program start, we spawn a custom dialog telling the user that some things are loading. This dialog has an animation, so it’s important to keep the main thread with the GUI clear while we load data in the background thread. When that is done, we sent a command to a callback that Destroy()s the dialog, and the program is able to function as normal.
This works well in 2.8, but it seems to hang our app in 3.0. The dialog message disappears, but we cannot close the program or interact with the GUI, almost as if the GUI was still locked under Modal.
Here’s a test script that demonstrates, being as close to the original program as possible in the logic path it takes:
import wxversion
wxversion.select('3.0')
import wx
import time
import threading
class OpenThread(threading.Thread):
def __init__(self, callback):
threading.Thread.__init__(self)
self.callback = callback
self.start()
def run(self):
time.sleep(0.5) # Give GUI some time to finish drawing
for i in xrange(5):
print i
time.sleep(.3)
print "ALL DONE"
wx.CallAfter(self.callback)
class WaitDialog(wx.Dialog):
def __init__(self, parent, title = "Processing"):
wx.Dialog.__init__ (self, parent, id=wx.ID_ANY, title = title, size=(300,30),
style=wx.NO_BORDER)
mainSizer = wx.BoxSizer( wx.HORIZONTAL )
self.SetBackgroundColour(wx.WHITE)
txt = wx.StaticText(self, wx.ID_ANY, u"Waiting...", wx.DefaultPosition, wx.DefaultSize, 0)
mainSizer.Add( txt, 1, wx.ALL|wx.ALIGN_CENTER_VERTICAL, 0 )
self.SetSizer( mainSizer )
self.Layout()
self.Bind(wx.EVT_CLOSE, self.OnClose)
self.CenterOnParent()
def OnClose(self, event):
pass
class MainFrame(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, wx.ID_ANY, "Test")
self.waitDialog = None
mainSizer = wx.BoxSizer( wx.HORIZONTAL )
choice = wx.Choice(self, wx.ID_ANY, style=0)
choice.Append("No Selection", 0)
choice.Append("Selection 1", 1)
choice.Append("Selection 2", 2)
mainSizer.Add( choice , 1, wx.ALL|wx.ALIGN_CENTER_VERTICAL, 0 )
self.SetSizer( mainSizer )
self.Show()
self.doThing()
def doThing(self):
self.waitDialog = WaitDialog(self, title="Opening previous fits")
OpenThread(self.closeWaitDialog)
self.waitDialog.ShowModal()
def closeWaitDialog(self):
self.waitDialog.Destroy()
test = wx.App(False)
MainFrame()
test.MainLoop()
``
You can comment out the self.waitDialog bits and see that it is the dialogs giving trouble. There are other places in the program that this happens in, always after we close out of a Dialog, so it’s not just constrained to this specific example. Everything works as it should on Linux and Windows as far as we can tell. Is there something I’m missing? Is there a workaround? We also have a few more dialogs that we utilize, so a workaround would ideally be a small fix rather than a huge refactoring.