Hello,
I would like to use double bufferning to hide any flicker as my forms are
drawn.
When I use some double buffering I usually use some code that looks like
this:
RectangleType lRect;
WinHandle lOffscreen, lOnscreen;
Err err;
//save to back buffer
{
lOnscreen = WinGetDrawWindow();
if (lOnscreen)
{
lRect.topLeft.x = 0;
lRect.topLeft.y = 0;
WinGetWindowExtent(&lRect.extent.x, &lRect.extent.y);
lOffscreen = WinCreateOffscreenWindow(lRect.extent.x, lRect.extent.y,
nativeFormat, &err);
WinCopyRectangle(lOnscreen, lOffscreen, &lRect, 0, 0, winPaint);
WinSetDrawWindow(lOffscreen);
}
}
.... insert drawing code here
{
WinSetDrawWindow(lOnscreen);
WinCopyRectangle(lOffscreen, lOnscreen, &lRect, 0, 0, winPaint);
WinDeleteWindow(lOffscreen, false);
}
Now if I try to do call this code before FrmDrawForm in the frmOpenEvent
event it doesn't work because WinGetDrawWindow returns null.
How then should I use double buffering at this time.
Best regards
Benoit
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