Hi,
On 2/16/11 9:23 AM, eric wrote:
Philipp Lohmann a écrit : If you wanted to emulate this behavior on
all platforms you could have your own control that does this using a
VitualDevice to prepare its text and then only copy that to the window
when the ::Paint method gets called. But that is probably a bit
overblown.
After lot of tries, and some algo improvments, I fear this will be the
only relible solution : flickering is always present on both Windows
and Linux.
Could you please give me some tracks, or point me existing example in
the code, to implement this VirtualDevice ? (of course the code will
be reversed if you consider it interesting for OpenOffice.org)
You would have a VirtualDevice that spans the area where you currently
have "flickering" problems. So when the need to change the contents of
that area arises, you can do all painting in that backbuffer and only
copy it to window when you're done.
So like this:
#include "vcl/virdev.hxx"
void UpdateAffectedArea()
{
VirtualDevice aDev;
aDev.SetBackground( Color( < my background color > ) );
aDev.SetOutputSizePixel( < my size in pixel > );
maFixedText.Draw( &aDev, <position>, <size>, <flags> );
maWindow.DrawOutDev(
<position in window>, <my size in pixel>,
Point( 0, 0 ), <my size in pixel>,
&aDev );
}
However there is a caveat: since you do not have a real FixedText
control there anymore, accessibility will not work for this area, so no
screen readers etc. Not worth dropping that for a little flicker IMHO,
but possible.
Kind regards, pl
--
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