[Mono-winforms-list] Copy rather than drawing an image to a graphics object?

Stifu stifu at free.fr
Wed Jan 5 11:35:46 EST 2011

Hmm... Random idea: isn't there a mode in WinForms that lets a parent draw
its children? I forgot the details.
Maybe something like that: http://support.microsoft.com/kb/943454
Except that example uses P/Invokes, unfortunately.

I also found this:

Last random idea: use parent.DrawToBitmap(), then draw your child control on
top of it?

cs_eps wrote:
> Thanks for your answer!
> Right, I could clear/redraw the control only partially. This would reduce,
> but not completely avoid flicker and would raise the complexity of the
> code.
> I'm still looking for copying, instead of drawing. I just saw that cairo
> uses the CAIRO_OPERATOR_OVER compositing operator by default, but it could
> be set to CAIRO_OPERATOR_SOURCE before drawing my buffer and then set it
> back.
> Is that a way? How can it be realized without modifying the
> System.Drawing.Graphics class (It still should build with .NET).
> Stifu wrote:
>> Hi,
>> How about defining clip regions for the parts that should be transparent,
>> before calling Clear?
>> However, I remember getting into issues doing something similar with
>> Mono. It worked fine with .NET, though.
>> See: https://bugzilla.novell.com/show_bug.cgi?id=492299

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