Get the selected cell in OO/LO Calc macro

        if theSelection.SupportsService("com.sun.star.sheet.SheetCell")  then
            ' SINGLE CELL SELECTED
            theCell=theSelection
            msgbox "1/A Selected cell: " + theCell.RangeAddress.StartColumn + ":" + theCell.RangeAddress.StartRow
            oActiveCell = ThisComponent.getCurrentSelection()
            oConv = ThisComponent.createInstance("com.sun.star.table.CellAddressConversion")
            oConv.Address = oActiveCell.getCellAddress
            msgbox "1/B Cell Address: " + oConv.Address.Column + ":" + oConv.Address.Row
        end if
        if theSelection.SupportsService("com.sun.star.sheet.SheetCellRange")  then
            ' RANGE OF CELLS SELECTED OR SINGLE CELL SELECTED
            msgbox  "2 Selected cell in a range: " + theSelection.RangeAddress.StartColumn + ":" + theSelection.RangeAddress.StartRow + " - " + _
                    theSelection.RangeAddress.EndColumn + ":" + theSelection.RangeAddress.EndRow
        end if
        activeSheet = ThisComponent.getCurrentController.getActiveSheet
        theCell = UsedRange(activeSheet)
        msgbox  "Used range: " + theCell.RangeAddress.StartColumn + ":" + theCell.RangeAddress.StartRow + " - " + _
                theCell.RangeAddress.EndColumn + ":" + theCell.RangeAddress.EndRow + "; " + _
                theCell.AbsoluteName

Function UsedRange(oSheet As Variant) As Variant
    REM https://ask.libreoffice.org/t/looking-for-last-row-used-programmatically/26223/5
    Dim oCursor As Variant
    oCursor = oSheet.createCursor()
    oCursor.gotoEndOfUsedArea(False)
    oCursor.gotoStartOfUsedArea(True)
    UsedRange = oCursor
End Function