Problem related to timer?



  • In the code given below the mousepress slot is not called at all. what may be the problem behind it?
    @
    #ifndef BUTTON_H
    #define BUTTON_H

    #include <QtGui>

    class button:public QPushButton
    {
    Q_OBJECT

    public:
    button(QWidget *parent = 0);
    void animate_button();

    public slots:
    void mousepress();

    };

    #endif // BUTTON_H

    #include <QtGui>
    #include "ofi_vc_gui_button.h"

    button::button(QWidget *parent): QPushButton(parent)
    {
    qDebug ()<<"button constructor";
    QPalette pal;
    pal.setColor(QPalette::ButtonText,QColor(0,255,255));
    setPalette (pal);
    setText ("hello");
    }

    void button::animate_button (bool t)
    {
    QTimer timer;
    connect (&timer, SIGNAL(timeout()), this, SLOT(mousepress()));
    timer.start (1000);
    qDebug ()<<"timer called";
    }

    void button::mousepress ()
    {
    qDebug ()<<"mouse pressed";
    }

    #include <QtGui/QApplication>
    #include "ofi_vc_gui_button.h"

    int main(int argc, char *argv[])
    {
    QApplication a(argc, argv);
    QMainWindow window;
    button *b1 = new button(&window);
    b1->animate_button ();

    #if defined(Q_WS_S60)
    window.showMaximized();
    #else
    window.show();
    #endif

    return a.exec&#40;&#41;;
    

    }

    @



  • In your code, timer is a local variable in button::animate_button (bool t), and will be destroyed after the function ended.

    You should declare it on the heap instead:

    @
    void button::animate_button (bool t)
    {
    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()),
    this, SLOT(mousepress()));
    timer->start (1000);
    qDebug ()<<"timer called";
    }
    @



  • thank you for your useful post i missed that


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