Nur Stringgrid transparent ?

[Der schöne Günther]

Ja, für Formulare, aber nicht für einzelne Komponenten, in diesem Fall den Stringgrid.

Nur mal so runtergetippt, Beispielvideo hier:

Delphi-Quellcode:

procedure TForm1.CheckBox1Click(Sender: TObject);
var
   isTransparent: Boolean;
begin
   isTransparent := (Sender as TCheckBox).Checked;
   setIsStringGridTransparent(isTransparent);
end;

procedure TForm1.setIsStringGridTransparent(const isTransparent: Boolean);
var
   exStyle: DWORD;
begin
   exStyle := GetWindowLongPtr(StringGrid1.Handle, GWL_EXSTYLE);
   Win32Check(exStyle <> 0);

   if(isTransparent) then
      begin
         exStyle := (exStyle or WS_EX_LAYERED);
         Win32Check(
            SetWindowLongPtr(StringGrid1.Handle, GWL_EXSTYLE, exStyle)
            <>
            0
         );

         Win32Check( SetLayeredWindowAttributes(
            StringGrid1.Handle,
            0,
            127, // 50 % von 255
            LWA_ALPHA
         ) );
      end
   else
      begin
         exStyle := (exStyle xor WS_EX_LAYERED);
         SetWindowLong(StringGrid1.Handle, GWL_EXSTYLE, exStyle);
        end;
end;