Emitted whenever the focus enters into the widget or one of its descendents.
Note that this means you may not get an ::enter signal
even though the widget becomes the focus location, in
certain cases (such as when the focus moves from a descendent
of the widget to the widget itself). If you are interested
in these cases, you can monitor the
property for changes.
|Default handler:|| |
The default handler is called after the handlers added via