Re: [Pythoncard-users] Refresh components

[Kevin A. <al...@se...>]

On Apr 27, 2004, at 11:16 AM, Kevin Altis wrote:

> Calling Refresh and Update is safest because it forces the whole 
> control to
> be redrawn. The StaticText component actually contains an explicit 
> Refresh()
> call as part of its _setText method but I'm considering removing that. 
> The
> original idea was that StaticText is more likely to be used for the 
> kind of
> status messages you are doing above, so it would be nice to have it
> automatically do the right thing. Of course, it really needs to call 
> Update
> as well for it to always work on all platforms, so I'll add that until 
> a
> decision is made on whether to drop automatic Refresh/Update in the 
> future.
>
I went ahead and added a redraw() method to Widget, so starting with 
release 0.8 it will be easy to force an immediate update with any 
component.

     def redraw(self):
         """Force an immediate redraw without waiting for an event 
handler to finish."""
         self.Refresh()
         self.Update()

Note that this isn't required for BitmapCanvas since it refreshes 
automatically as part of the blit from the offscreen bitmap after each 
draw operation and has its own autoRefresh attribute to avoid blits 
after each draw operation if you're doing a lot of draw operations at 
once and want finer control over when to update the screen.

ka