Mouse Coordinates To Caret Position in Firemonkey TMemo Component

Question

Handling Mouse / Drag&Drop Events on Firemonkeys TMemo Component offers Mousecursor Coordinates. Is there a way to calculate the CaretPosition out of the Mouse Coordinates?

I want to drag a text into a TMemo and this text should be inserted at current MouseCoordinates.

Answer 1

Try calling GetPointPosition.

Unfortunately, this seems to have been removed from TMemo in XE3. As a quick and dirty workaround, you could try this:

function GetPointPosition(Memo: TMemo; Pt: TPointF; RoundToWord: Boolean = False): TCaretPosition;
var
  I, LPos: Integer;
  Rgn: TRegion;
begin
  Result.Line := -1;
  Result.Pos := -1;
  for I := 0 to Memo.Lines.Count - 1 do
  begin
    if Memo.Lines.Objects[I] is TTextLayout then
    begin
      LPos := TTextLayout(Memo.Lines.Objects[I]).PositionAtPoint(Pt, RoundToWord);
      if LPos >= 0 then
      begin
        if LPos > 0 then
        begin
          Rgn := TTextLayout(Memo.Lines.Objects[I]).RegionForRange(TTextRange.Create(LPos, 1), RoundToWord);
          if (Length(Rgn) > 0) and (Rgn[0].Top > Pt.Y) then
            Dec(LPos);
        end;
        Result.Line := I;
        Result.Pos := LPos;
        Break;
      end;
    end;
  end;
end;