updating the statusbar according to the menubar using QMenuBar::hovered()?

[furskytl]

Hello,every one!I want to implement one effect in my application :when the mouse is on a certain item of the menu,the statusbar will show the toollip message accordingly,and when the mouse is out,the statusbar show nothing! I think of it like this:

connect(Ui_MainWindow::menuBar,SIGNAL(hovered(QAction*)),this,SLOT(updateBar(QAction*)));

connect(Ui_MainWindow::menuBar,SIGNAL(hovered(QAction*)),this,SLOT(updateBar(QAction*)));

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and

void MainWindow::updateBar(QAction * action)
{
    if(action != NULL)
    {
        statusBar()->showMessage(action->toolTip(),5000);
    }
 
}

void MainWindow::updateBar(QAction * action)
{
    if(action != NULL)
    {
        statusBar()->showMessage(action->toolTip(),5000);
    }

}

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However,it doesn't work!And I happen to find that some messages flash quickly on the statusbar when I move my mouse over the menubar.I think maybe the signal hovered() is always emitting while my mouse stops on one of the actions of the menubar,right?What should I do?Thanks very much!