hello, everybody!

Now I look to QT examples, like Calculator where we have QLineEdit as display widget.
I have just tried some things with 'calculator' code, GUI code.

I will disable text selection in display but how?
I know we can disable selection in view's (like QTabView or QTreeView)
but how to do it for QLineEdit?

setFocus(NoFocus) ?

or some other things like:
1. set in palette highlight color same as background color.
2. if receive signal 'selectionChange' set selection back to 0

May be there are another solutions for this?