How to detect whether a Qt application is running in foreground or background ?

[abk883]

Does Qt application/ mainwindow or some other class provides an API to to detect whether a Qt application is running in foreground or background ?

Or is there some kind of signal/ slot mechanism for the same. Thanks

[wysota]

Did you try checking QWidget::isVisible(), QWidget::isMinimized() and QWidget::isActive()?

[abk883]

Thanks wysota.. I actually want a Signal mechanism.
As in when some other application comes in foreground, i receive a signal in my running application and in the corresponding slot I can perform some action.

the above API's you mentioned can be used when I specifically want to check the status of my application.

[squidge]

You asked for an API, you got an API. If you want a signal, ask for a signal

A suitable signal might be QApplication::focusChanged.

[abk883]

Ya I should have framed the question in a better way
Thanks I will try using this signal in my app

---

Added after 1 56 minutes:

I was able to do this using the QApplication::focusChanged signal, doing a connect. corresponding slot:

void CApplication::OnAppFocusChanged(QWidget* old, QWidget* now)
{
int i = 0;
if(NULL == old)
{
//Focus regained..This is foreground app now
i=1;
}
else if(NULL == now)
{
//Focus lost. This is background app now.
i = 2;
}

}