Re: Transparent Panel

I can't read that post however it looks like its just doing transparent
bitmaps?

I am wanting a Panel to be transparent. So if a panel is ontop of a
PictureBox any controls in the Panel won't render a big white rectangle on
the Panel.

Thanks and take care.

"Fabien" wrote:

Hi,

Check out this:
http://fabdecret.blogspot.com/2007/11/transparent-background.html
But, it is only available for one transparency colour !

BR


Fabien Decret (Device Application Development MVP)
Windows Embedded Consultant


ADENEO (ADESET)
http://www.adeneo.adetelgroup.com/ | http://fabdecret.blogspot.com/



On Dec 4, 6:12 pm, Simon <Si...@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hey gang.

I am working on making a transparent panel control. How this control works
is making itself invisible then invalidating its parent.

This works great until you get panels in panels & using auto scroll on the
Panel because the flickering that occurs when scrolling.

I am thinking this is because its invalidating a parent which invalidates
its parent etc and I believe its probably getting up to invalidating the form
level.

I am trying to achieve Panels that are transparent so if there is a
PictureBox behind them, it will show through.

As follows:

protected override void OnPaintBackground(PaintEventArgs e)
{
if (this.BackColor == Color.Transparent)
return;

base.OnPaintBackground(e);
}

protected override void OnPaint(PaintEventArgs e)
{
if (this.BackColor == Color.Transparent)
{
if (!isPaintBackgroundComplete)
{
this.Visible = false;
this.Parent.Invalidate(Bounds);
this.Parent.Update();
this.Visible = true;
isPaintBackgroundComplete = true;

return;
}
isPaintBackgroundComplete = false;
}
}

Is there a better way to achieve this? As mentioned this mostly flickers
when scrolling because I think its invalidating 2-3-4 parents up to the form
level.

Is there any PInvoke support that could help out here? I could not find
anything on google. Everything I saw was for the full framework.

I would appreciate any help.

Thanks and take care.


.

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