[Lazarus] Transparent Container/Panel in LCL?

[zeljko]

On Monday 03 of September 2012 16:55:47 Graeme Geldenhuys wrote:
> On 03/09/12 15:19, Felipe Monteiro de Carvalho wrote:
> > Transparency is supported, just use TWinControl.SetShape(Region) or
> > SetShape(Bitmap);
> 
> It seems some people have different definitions of "transparency". Will
> that make the TTransparentContainer clear like glass? Will I see through
> it and see the main form's tiled canvas?
> 
> Anyway, I'm not 100% sure how to your the TRegion, so tried the
> following. Still no luck. The TTransparentContainer doesn't look
> "visually" transparent / see-thru.
> 
> 
> procedure TForm1.FormCreate(Sender: TObject);
> var
>    r: TRegion;
> begin
>    Width := 400;
> 
>    r := TRegion.Create;
>    FMyContainer := TTransparentContainer.Create(self);
>    FMyContainer.Parent := self;
>    with FMyContainer do
>    begin
>      Left := 50;
>      Top := 50;
>      Width := 300;
>      Height := 200;
>      r.AddRectangle(0, 0, FMyContainer.Width, FMyContainer.Height);
>      SetShape(r);
>    end;
> 
>    ...
> end;
> 
> 
> See attached image for the results.

I don't know for gtk2 atm, but eg. under Qt QPainter have opacity property 
which does thing you want. Maybe it's possible under gtk2 (by using cairo) to 
do same thing.

zeljko