[wxPython-users] buffered dc

[Robin Dunn]

Gabriel Murray wrote:
> In my GUI, I have a BufferedPaintDC with some lines drawn on it which 
> updates whenever a user presses a certain button. One thing I've noticed 
> is that even when this window with the DC is just minimized and then 
> maximized again, it always takes 1 to 2 seconds for the drawn lines to 
> re-appear. It is just a grey background in the interim. Is there any way 
> to prevent this from happening? It doesn't seem to stem from the code 
> because nothing is being processed. It's just that the window is being 
> brought to the foreground again.

Are you doing anything in the EVT_SIZE handler?  (Like recreating the 
buffer and redrawing the lines into it?)

Are you redrawing everything into the buffer again in the EVT_PAINT 
handler, or are you saving the buffer and only drawing the buffer to the 
window?

I experimented with the doodle sample with several thousand line 
segments and I never saw a delay longer than about a quarter second when 
restoring from minimized, switching to maximized, and back to unmaximized.

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