Function Tree.getSelectedColumn

Returns the currently focused column, or -1 if no column is focused. In constant SELECT_SINGLE mode, the focused column is the selected column. In constant SELECT_ROW mode, the focused column is always 0 if any item is selected. In constant SELECT_MULTI mode, the focused column is the column under the focus cursor, and there are not necessarily any column selected. To tell whether a column of an item is selected, use TreeItem.isSelected.