how to get the singal of app be foreground and background?

[wangruiwz]

I find a doc in wiki about how to get.but It doesn't work!!

the QApplication::symbianEventFilter can't receive the EEventFocusGained and EEventFocusLost signal.

my phone is N8
I use QtSDK1.1.3

http://www.developer.nokia.com/Commu...Qt_for_Symbian

[rahulvala]

If you want a signal during each time app be foreground and background.

QApplication::focusChanged

regards,

[wangruiwz]

No,that signal is between two QWidget.
I need the application change to foregound and background.

[rahulvala]

This article has code ,http://doc.qt.nokia.com/4.7-snapshot...tml#properties

Whenever the application is active it will show application is active or not ? Just check.

Otherwise you have to achieve that using Symbian specific code. from the article you mention in #1

regards,

[savaj]

How your code looks like?

[wangruiwz]

This article has code ,http://doc.qt.nokia.com/4.7-snapshot...tml#properties

Whenever the application is active it will show application is active or not ? Just check.

Otherwise you have to achieve that using Symbian specific code. from the article you mention in #1

regards,

that's QML,but I use QT.


this is my code:

bool MyApplication::symbianEventFilter(const QSymbianEvent *symbianEvent )
{
const TWsEvent *event = symbianEvent->windowServerEvent();
if( !event )
{
return false;
}
switch( event->Type() )
{
case EEventFocusGained:
{
qDebug() << "Focus gained"; break;
}
case EEventFocusLost:
{
qDebug() << "Focus lost";break;
}
default: break;
}
return false;
}

[Fuzzbender]

Instead of filtering symbian events, you might want to filter Qt events: QEvent::ApplicationActivate and QEvent::ApplicationDeactivate.

[savaj]

And you created instance of MyApplication in your main.cpp file?

[wangruiwz]

Instead of filtering symbian events, you might want to filter Qt events: QEvent::ApplicationActivate and QEvent::ApplicationDeactivate.

It's not for symbian,it's for desktop.

And you created instance of MyApplication in your main.cpp file?

of course

[treinio]

Well, it should still work for S^3. Try this:

#include <QtGui>
#include <QDebug>

#ifdef Q_OS_SYMBIAN
#include <QSymbianEvent>
#include <w32std.h>
#endif


class MyApplication : public QApplication
{
    Q_OBJECT
public:
  MyApplication( int& argc, char** argv ) : QApplication( argc, argv ) {}

#ifdef Q_OS_SYMBIAN
protected:
  bool symbianEventFilter( const QSymbianEvent* symbianEvent ) {
    const TWsEvent *event = symbianEvent->windowServerEvent();

    if( !event ) {
      return false;
    }

    switch( event->Type() ) {
      case EEventFocusGained: {
        qDebug() << "Focus gained";
        break;
      }
      case EEventFocusLost: {
        qDebug() << "Focus lost";
        break;
      }
      default:
        break;
    }
    return false;
  }
#endif // Q_OS_SYMBIAN
};

#include "main.moc"

int main(int argc, char *argv[])
{
    MyApplication a(argc, argv);
    QMainWindow w;
    w.showMaximized();
    return a.exec();
};

No,that signal is between two QWidget.
I need the application change to foregound and background.

Actually, QApplication::focusChanged() signal can be used as well. When you're application comes to foreground, 'old' widget is NULL and 'now' is nonzero, and vice versa when it goes to background.

It's worth noting that both of these methods give you 'focus lost-focus gained' events also when there's a global dialog/note (e.g. alarm, 'charging...', etc.) briefly displayed on screen.