How To do an actionListener

[bod]

Okey I get it. But I have another problem now. I have a menu at top. Like "File" menu in browser. In it, there are two actions: actionViewClassic, actionViewModern.
These are checkable. So if one of them is checked, the other one must be unchecked. To reach this goal,I passed the other Action as a parameter to the function.However since, I created the gui with designer, if i try to change the other buttons checked function it gives me an error Because of scoping. how can I accomplish these checkablity situation ??

Error:

GeneratedFiles\Debug\moc_assignment1.cpp(66) : error C2248: 'QAction::QAction' : cannot access private member declared in class 'QAction'
1> d:\qt\include\qtgui\../../src/gui/kernel/qaction.h(191) : see declaration of 'QAction::QAction'
1> d:\qt\include\qtgui\../../src/gui/kernel/qaction.h(41) : see declaration of 'QAction'

[jpn]

These are checkable. So if one of them is checked, the other one must be unchecked... how can I accomplish these checkablity situation ??

Take a look at QActionGroup as already proposed.