emit a signal from inside a callback routine

[Tanuki-no Torigava]

Hi. When I met the same problem I solved that with startTimer/killTimer and void timerEvent ( QTimerEvent * event ) reimplementation. Then what you can do is to set any Boolean variable (or QMutex based variable if you have multiple access) to true (lock) accordingly and process that inside timerEvent.

Typical solution might be:

static const int timeScale = 50; // 50 Msec
 
class A: public QObject
{
    Q_OBJECT
 
public:
 
    Q_INVOKABLE A( QObject * parent = 0 )
        : QObject(parent),
          m_check(false),
          m_timer(0)
    {
        m_timer = startTimer(timeScale);
    }
    ~A()
    {
       if (m_timer > 0)
           killTimer(m_timer);
    }
 
public slots:
 
     void handler()
     {
          if (m_check)
              return;
// do something here
          m_check = true;
     }
 
protected:
     void timerEvent ( QTimerEvent * event)
     {
          if (m_check)
          {
              // do something
              emit some_signal(some_args);
              m_check != m_check; // Just  quicker
          }
     }
private:
 
bool m_check;
int   m_timer;
}

static const int timeScale = 50; // 50 Msec

class A: public QObject
{
    Q_OBJECT

public:

    Q_INVOKABLE A( QObject * parent = 0 )
        : QObject(parent),
          m_check(false),
          m_timer(0)
    {
        m_timer = startTimer(timeScale);
    }
    ~A()
    {
       if (m_timer > 0)
           killTimer(m_timer);
    }

public slots:

     void handler()
     {
          if (m_check)
              return;
// do something here
          m_check = true;
     }

protected:
     void timerEvent ( QTimerEvent * event)
     {
          if (m_check)
          {
              // do something
              emit some_signal(some_args);
              m_check != m_check; // Just  quicker
          }
     }
private:

bool m_check;
int   m_timer;
}

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Good luck.