In Control.cs in the WndProc method, the handling of the paint event is as
follows:
case Msg.WM_PAINT: {
PaintEventArgs paint_event;
paint_event = XplatUI.PaintEventStart(Handle);
if ((control_style & (ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint)) == (ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint)) {
OnPaintBackground(paint_event);
}
OnPaint(paint_event);
XplatUI.PaintEventEnd(Handle);
if (!GetStyle(ControlStyles.UserPaint)) {
DefWndProc(ref m);
}
return;
}
If I read ths correctly, OnPaintBackground will be called if the control_style
includes ControlStyles.AllPaintingInWmPaint and ControlStyles.UserPaint.
I believe this should be the opposite (change == to !=). If
ControlStyles.AllPaintingInWmPaint and ControlStyles.UserPaint are set (i.e.
everything is done in OnPaint), OnPaintBackground should not be called.
I have tried to change my drawing code from using the WndProc to
overriding OnPaint. This change helps a bit (I don't see the background color
flash), but my drawing seems much slower (almost as if double buffering is not
working with this method???).
- Jonathan
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