Std.Ui.Selection

The selection after a row activation: rows are controls tagged

Every row chosen, focus kept.

Nothing chosen.

The selection after a keymap command: select.all, select.none,

Every row from the anchor through index chosen, the anchor kept; with

Whether index is chosen.

The focus moved by delta rows, clamped to the list: extending grows

The selection for a list that now has count rows: rows past the end

The chosen rows in ascending order.

Nothing chosen in a list of count rows.

Which rows of a list of count are chosen, the row a range extends from

Only index chosen; it becomes the anchor and focus. Out of range clears.

index added or removed, leaving the rest; it becomes the anchor and focus.