Mattias Gaertner schrieb:

ClientRect Left,Top is 0,0, so Right=ClientWidth and Bottom=ClientHeight.

What about the determination of the ScrollOffset:

function TScrollingWinControl.GetClientScrollOffset: TPoint;
begin
  if (HorzScrollBar <> nil) and (VertScrollBar <> nil) then
  begin
    Result.X := HorzScrollBar.Position;
    Result.Y := VertScrollBar.Position;
  end else
  begin
    Result.X := 0;
    Result.Y := 0;
  end;
end;

Does a scrolling control really *always* have two or zero scrollbars?
If so, a check of only one scrollbar would be sufficient,
otherwise every scrollbar must be checked individually!

DoDi


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