[wxPython-users] Ensure that a dialog is fully drawn

[Robin Dunn]

Torsten Bronger wrote:
> Hallöchen!
> 
> I defined a simple subclass of wx.Dialog called "WaitDialog", which
> I'd like to use like this:
> 
>         wait_message = WaitDialog(_(u"I'm bootstrapping, please be patient") + u" …", _(u"Bootstrapping"))
>         wait_message.Show()
> # Here
>         wx.Sleep(5)
>         wait_message.Destroy()
> 
> However, the frame of wait_message can never be really seen (at
> least not on my GTK system) because it's not updated early enough.
> How can I be sure that the frame is fully drawn at the point marked
> with "Here"?  Thank you!

The reason you don't see anything is because you are not allowing any 
events to be delivered to the dialog before you destroy it, so it is not 
receiving any paint events (or any others,) and so it is not displayed, 
painted, etc.  The way you allow events to be delivered is to either 
return to from the current event handler and let the MainLoop continue 
to run, or you call something that will run a temporary nested event 
loop, such as dialog.ShowModal, wx.Yield, etc.  See this wiki page for 
more discussion of how to manage doing things that take a "long time" 
and still keep the UI responsive:

http://wiki.wxpython.org/index.cgi/LongRunningTasks


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