c++ - Qt How to highlight menu? -

i need hide/show main menu function pressing alt key (like in firefox). know how hide , show it, can't highlight menu after showing it. i've tried menubar()->actions()[0].hover(), activatewindow(), setactiveaction(), activate(qaction::hover), nothing helps. how can it? maybe should use winapi functions instead of qt?

bool mainwindow::event(qevent *event){     if (event->type() == qevent::keypress)     {         qkeyevent *ke = static_cast<qkeyevent*>(event);         if (ke->key() == qt::key_alt)         {             keyreleaseevent(ke);             return true;         }     }     return qmainwindow::event(event); } 

handle alt

void mainwindow::keyreleaseevent (qkeyevent* event) {     if (event->key() == qt::key_alt){         if (menubar()->ishidden()){             menubar()->show();             menubar()->setfocus(qt::menubarfocusevent); //here trying highlight menu         }         else{             menubar()->hide();         {     } } 

try debug , see happening.

you can like:

if (menubar()->hasfocus())    qdebug() << " have focus"; else   qdebug() << " don't have focus"; 

and see if has focus works bad or if has no focus think problem... somewhere losing it

a little trick may using:

 qtimer::singleshot(0, menubar(), slot(setfocus())); 

on mainwindow::keyreleaseevent

and last thing... note set focus needs focuspolicy, maybe this helps you.