moveByOffset( offset , isSelecting, isSelectingRange)
- Return type: no return value
offsetis positive, adjusts the focused item forward by that many items. If
offsetis negative, adjusts the focused item backward by that many items. If
true, then the selection is also adjusted. If
true, then the new item is selected in addition to any currently selected items. If
false, any existing selection is cleared. Items that are hidden are skipped.