FocusWindowChange

[Oumayma]

Hi, I am using the FocusWindowChange signal to detect when my application no longer has focus. I would like that when my application does not have focus, the timer that I use stops its execution and when it has focus again, the timer will run again. This works for me in some cases, but when I bring up my Qmenu and go to another application, my application keeps receiving mouse click signals and resumes running the timer.

  QObject::connect(&a, &QGuiApplication::focusWindowChanged, [&](QWindow* window)
    {
        if(a.applicationState() == Qt::ApplicationInactive && w->activo){
            qDebug()<<a.applicationState();
            w->timer.stop();
        }else if(a.applicationState() == Qt::ApplicationActive && !w->timer.isActive() && w->activo){
            qDebug()<<a.applicationState();
            if(w->menudesplegado){
                w->menu->show();
                qDebug()<<"Esto con popup activo";
            }
            w->timer.start();
        }
        qDebug()<<window;
    });

When my app has focus:

When my app has not focus:

[mpergand]

Hi,

Have a try with this signal instead:
[signal] void QGuiApplication::applicationStateChanged(Qt::ApplicationState state)

[Oumayma]

@mpergand Could you give me an implementation example?

[mpergand]

QObject::connect(&a, &QGuiApplication::applicationStateChanged, [&](Qt::ApplicationState state)
    {
    qDebug()<<state;
    if(state==Qt::ApplicationInactive)
        {
        }
   else
        {
        }
    }

[Oumayma]

@mpergand still not working

[Cobra91151]

@Oumayma

Hello!

You can use the event method (https://doc.qt.io/qt-6/eventsandfilters.html). The list of event enums are available here: https://doc.qt.io/qt-6/qevent.html
Please, check out the text example below:

Code:
.h (your header file)

#include <QEvent>
#include <QDebug>

protected:
    bool event(QEvent *event) override;

.cpp

bool TestWidget::event(QEvent *event)
{
    switch (event->type()) {
        case QEvent::WindowActivate:
            qDebug() << "Window has focus!!!";
            break;
        case QEvent::WindowDeactivate:
            qDebug() << "Window lost focus!!!";
            break;
        default:
            break;
    }

    return QWidget::event(event);
}

Screenshot:

Happy coding!