QThread and QTimer

[sivrisinek]

Hi there,

i have a QTimer conflict within a ClassA inheriting from QThread. ClassA has a massive data processing routine, which we call from the QThread::run() in order to let it run with the Qt::LowPriority. This works fine. ClassA has a single instance during the whole runtime of the application.

class ClassA : QThread
{
public:
    ClassA();
    ~ClassA();
    InitGUI();
    focusHasLeft();
    focusHasCome();
 
protected slots:
    void refreshTimerSlot(); // this eventually starts the thread for reload of data
    threadFinished(); // this slot is connected to the "thread is finished" signal
 
private:
    //start the thread with low priority.
    startThread();
 
    // QThread
    void run(void); // this calls massiveDataReloadRoutine()
    void massiveDatareloadRoutine();
 
    QTimer refreshTimer;
}

class ClassA : QThread
{
public:
    ClassA();
    ~ClassA();
    InitGUI();
    focusHasLeft();
    focusHasCome();

protected slots:
    void refreshTimerSlot(); // this eventually starts the thread for reload of data
    threadFinished(); // this slot is connected to the "thread is finished" signal

private:
    //start the thread with low priority.
    startThread();

    // QThread
    void run(void); // this calls massiveDataReloadRoutine()
    void massiveDatareloadRoutine();

    QTimer refreshTimer;
}

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ClassA has a refresh timer which is used update the GUI periodically. This timer is in conflict with the QThread giving the message

"QObject::startTimer: timers can not be started from another thread"

inside the debug window. As a result, I can not start and stop the timer, and it runs all the time. The timer slot is being called without a problem.



But the problem is, if a change focus from the view i want to stop the timer so that the updates should not steal processing time.

In order to to stop the timer i have tried:

1) to stop the timer in ClassA::run() -> did not work
2) to stop the timer in ClassA::focusHasLeft() -> did not work
3) to stop the timer in ClassA::threafFinished() -> did not work

What is wrong?