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G-Label Notifications (Primary)
A g-label such as gMySubroutine may be listed in the control's options. This would cause the MySubroutine label to be launched automatically whenever the user performs an action in the control. This subroutine may consult the built-in variables A_Gui and A_GuiControl to find out which window and ListView generated the event. More importantly, it may consult A_GuiEvent, which contains one of the following strings or letters (for compatibility with future versions, a script should not assume these are the only possible values):

DoubleClick: The user has double-clicked a row. The variable A_EventInfo contains the row number.

R: The user has double-right-clicked within the control. The variable A_EventInfo contains the focused row number.

ColClick: The user has clicked a column header. The variable A_EventInfo contains the column number, which is the original number assigned when the column was created; that is, it does not reflect any dragging and dropping of columns done by the user. One possible response to a column click is to sort by a hidden column (zero width) that contains data in a sort-friendly format (such as a YYYYMMDD integer date). Such a hidden column can mirror some other column that displays the same data in a more friendly format (such as MM/DD/YY). For example, a script could hide column 3 via LV_ModifyCol(3, 0), then disable automatic sorting in the visible column 2 via LV_ModifyCol(2, "NoSort"). Then in response to the ColClick notification for column 2, the script would sort the ListView by the hidden column via LV_ModifyCol(3, "Sort").

D: The user has attempted to start dragging a row or icon (there is currently no built-in support for dragging rows or icons). The variable A_EventInfo contains the focused row number. In v1.0.44+, this notification occurs even without AltSubmit.

d (lowercase D): Same as above except a right-click-drag rather than a left-drag.

e (lowercase E): The user has finished editing the first field of a row (the user may edit it only when the ListView has -ReadOnly in its options). The variable A_EventInfo contains the row number.

Is there a LV_GetSelected() or something that I'm not seeing?

LV_GetNext([StartingRowNumber, "Checked | Focused"]): Returns the row number of the next selected, checked, or focused row.