Title: How to Drag & Drop items from a TListBox to a TRichEdit
function RECharIndexByPos(RichEdit: TRichEdit; X, Y: Integer): Integer;
var
P: TPoint;
begin
P := Point(X, Y);
Result := SendMessage(RichEdit.Handle, EM_CHARFROMPOS, 0, Longint(@P));
end;
procedure TForm1.RichEdit1DragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
var
P: TPoint;
begin
// Check, if Source is ListBox1
Accept := Source = ListBox1;
if GetCursorPos(P) then
with RichEdit1 do
begin
// Get the Index from Mouse Position
P := ScreenToClient(P);
SelStart := RECharIndexByPos(RichEdit1, P.X, P.Y);
SetFocus;
end;
end;
procedure TForm1.RichEdit1DragDrop(Sender, Source: TObject; X, Y: Integer);
begin
// finally insert text at mouse position
RichEdit1.SelText := ListBox1.Items[ListBox1.ItemIndex];
end;