[wxPython-users] wxProgressDialog problems

[Robin Dunn]

Larry Bates wrote:
> I am trying to implement a file upload dialog (see code below).  It 
> almost works, except that I can't get the cancel button to respond as 
> expect.  I'm certain it is something really small.

Events (like the cancel button event) won't be delivered if program flow 
is not in the main loop.  In real life that probably won't be a problem 
for most apps, as long as you don't block some event handler in a long 
running task.  In your sample it can be taken care of by using a timer 
to update the progress dialog.  See 
http://wiki.wxpython.org/LongRunningTasks for ideas on how to approach 
other situations.

     class MyApp(wx.App):
         def OnInit(self):
             self.callback = Callback("test file upload")
             self.callback.start(100)
             self.timer = wx.Timer(self)
             self.Bind(wx.EVT_TIMER, self.OnTimer, self.timer)
             self.timer.Start(200)
             self.count = 0
             return True

         def OnTimer(self, evt):
             if self.count < 100:
                 self.callback(100, self.count)
                 self.count += 1
             else:
                 self.callback.complete()

     app = MyApp(0)
     app.MainLoop()


-- 
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!