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| procedure MakeFormTransparent(Form: TForm); var AControl: TControl; A, Margin, X, Y, CtlX, CtlY: Integer; ClientRgn, FullRgn, CtlRgn: HRGN; begin with Form do begin Margin := (Width - ClientWidth) div 2; FullRgn := CreateRectRgn(0, 0, Width, Height); X := Margin; Y := Height - ClientHeight - Margin; ClientRgn := CreateRectRgn(X, Y, X + ClientWidth, Y + ClientHeight); CombineRgn(FullRgn, FullRgn, ClientRgn, RGN_DIFF); for A := 0 to ControlCount - 1 do begin AControl := Controls[A]; if (AControl is TWinControl) or (AControl is TGraphicControl) then with AControl do begin if Visible then begin CtlX := X + Left; CtlY := Y + Top; CtlRgn := CreateRectRgn(CtlX, CtlY, CtlX + Width, CtlY + Height); CombineRgn(FullRgn, FullRgn, CtlRgn, RGN_OR); end; end; end; SetWindowRgn(Form.Handle, FullRgn, True); end; end;
procedure UndoFormTransparent(Form: TForm); var FullRgn: HRGN; begin with Form do begin FullRgn := CreateRectRgn(0, 0, Width, Height); CombineRgn(FullRgn, FullRgn, FullRgn, RGN_COPY); SetWindowRgn(Handle, FullRgn, True); end; end; |