This property holds the reason of the last focus change.

\note This property does not indicate whether the control has \l {Item::activeFocus}
      {active focus}, but the reason why the control either gained or lost focus.

\value Qt.MouseFocusReason         A mouse action occurred.
\value Qt.TabFocusReason           The Tab key was pressed.
\value Qt.BacktabFocusReason       A Backtab occurred. The input for this may include the Shift or Control keys; e.g. Shift+Tab.
\value Qt.ActiveWindowFocusReason  The window system made this window either active or inactive.
\value Qt.PopupFocusReason         The application opened/closed a pop-up that grabbed/released the keyboard focus.
\value Qt.ShortcutFocusReason      The user typed a label's buddy shortcut
\value Qt.MenuBarFocusReason       The menu bar took focus.
\value Qt.OtherFocusReason         Another reason, usually application-specific.

\sa Item::activeFocus