QT QTimer

[sonulohani]

How to pause and resume QTimer?

[Lykurg]

As far as I know you cant. Use QTimeLine instead.

[Lesiok]

And what is wrong with the methods start() and stop() ?

[Santosh Reddy]

Can you try this

class Timer : public QTimer
{
    Q_OBJECT
public:
    explicit Timer(QObject * parent)
        : QTimer(parent)
        , mRemainingTime(0)
    {
        ;
    }
 
public slots:
    void pause(void)
    {
        mRemainingTime = remainingTime();
        stop();
    }
 
    void resume(void)
    {
        start(mRemainingTime);
    }
 
private:
    int mRemainingTime;
};

class Timer : public QTimer
{
    Q_OBJECT
public:
    explicit Timer(QObject * parent)
        : QTimer(parent)
        , mRemainingTime(0)
    {
        ;
    }

public slots:
    void pause(void)
    {
        mRemainingTime = remainingTime();
        stop();
    }

    void resume(void)
    {
        start(mRemainingTime);
    }

private:
    int mRemainingTime;
};

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One downside is that the interval() is not consistent through out the Timer's running cycle, interval() changes when ever time is pause()ed and resume()ed.

[ChrisW67]

QTimer::remainingTime() is only available in Qt 5