wxpython : wxDc and Refresh() = flash

[marco]

Juste a simple question about the DC in wxpython ...

I've made a wxWindow class, where i need to paint myself the content.
so i've added an evt_paint() to draw in the wxPaintDC ...
It works like a charm !! superb

To trigg the painter event, in some codes, i use the Refresh() method
It works greatly !

But the trouble is :

i found it flash a lot my wxwindow, when i trigg the painter ...
(i see speed "drawing horizontal line" .. which make the screen seems to
flash (i don't know how to describe that, but that flash my screen ;-) ))

Here are my questions :

- is there a way to wait for an "vertical top" to draw the content (to
synchronize with the screen redraw) ?
- is there a way to implement a double-buffering system, to let the redraw
be smoother ?

in an another way : how to skip theses flash redraw ?

[Brian Kelley]

marco wrote:

Juste a simple question about the DC in wxpython ...

I've made a wxWindow class, where i need to paint myself the content.
so i've added an evt_paint() to draw in the wxPaintDC ...
It works like a charm !! superb

To trigg the painter event, in some codes, i use the Refresh() method
It works greatly !

Two points
1) you would do well to subscribe to the wxPython news group, they
specifically handle wxPython related issues and you will have a better
shot at getting the right answer.

http://wxpython.org/maillist.php

2) In the demos supplied by wxPython, see the wxScrolledWindo w example.
They show how to use a double buffering screen that will help prevent
the flashing screen when it is being redrawn. Just look for

if BUFFERED:

in the code. If you don't have access to this, I'll send it to you.

Brian

[marco]

> > Juste a simple question about the DC in wxpython ...

I've made a wxWindow class, where i need to paint myself the content.
so i've added an evt_paint() to draw in the wxPaintDC ...
It works like a charm !! superb

To trigg the painter event, in some codes, i use the Refresh() method
It works greatly !
Two points
1) you would do well to subscribe to the wxPython news group, they
specifically handle wxPython related issues and you will have a better
shot at getting the right answer.

http://wxpython.org/maillist.php

sure ... and i've already subscribe to it
2) In the demos supplied by wxPython, see the wxScrolledWindo w example.
They show how to use a double buffering screen that will help prevent
the flashing screen when it is being redrawn. Just look for

if BUFFERED:

in the code. If you don't have access to this, I'll send it to you.

Brian

thanx a lot ...
i've got the demo, and got access to the code ...
(i use it a lot, but never see an example to disabled this flashed
rendering)

i will use it ...
thanx for your answer ...