How does a QTableView signal/notify that the whole row has been selected and unselected? Not just a cell, but when the user clicks on the 'virtual row header' which is to the left of the first cell in the row.

The goal is this: when a user selects a whole row, enable a button on the form which will allow the user to act upon the selected row. It is also important to know when no row is selected, so the button is not enabled.

Might there be some way to wire this up between the QTableView's model and the button?

Sam