QKeySequenceWidget

The QKeySequenceWidget is a widget to input a QKeySequence.
 
This widget lets the user choose a QKeySequence, which is usually used as a
shortcut key. The recording is initiated by calling captureKeySequence() or
the user clicking into the widget.

The QKeySequenceWidget is based on code KKeySequenceWidget from KDE (version 4.x) project.
But it not needs kde libraries for building and working.