Keybord

Hello guys and maybe some girls :)
I got one problem with my keybord widget.
It has method setLine(QLineEdit*).
How to set such thing for e.g. when i press tab button and change active QLineEdit how to force widget to make this method ?
Thanks

Use QShortcut class.

I hit thanks, however it's not exacly what im seeking for. QShortcut will works only when I press the button but not when i use a mice.

And what about the QWidget focus functions reimplementation ?