Qt handling QPushButton Autorepeat() behavior with isAutoRepeat()

Question

I'm new to QT and am making a widget that interfaces with a pre-existing gui. I'd like to have my widget continuously output one signal while the user has a pushbutton pressed and then continuously output another when it is released.

By enabling autorepeat I can have the widget output my signal while the user is pressing the pushbutton, however, the output signal switches between pressed() and released(). E.G.

<> Outputs: * pressed signal * released signal * pressed signal * released signal

I've seen this question been asked about keyPressEvents but I'm not sure how to access isAutoRepeat() for PushButtons. Can someone give me advice on this?

Can you explain the purpose of a continuous signal when it is released? What component need to know about the button state (ie describe the pre-existing gui requirement)? Do you realize that such mechanism mean that the button will be triggering one or another signal every time? [can you explain the X and not the Y?](http://meta.stackexchange.com/questions/66377/what-is-the-xy-problem) — UmNyobe, Feb 05 '16 at 16:34

Jeet · Accepted Answer · 2016-02-05T17:30:59.920

One way is you can use timer object to achieve this. Below is the example, that will run the 2 slot's when button pressed and released. The code comment will explain in detail. when button pressed & released a text box will show the continuous time in Milli-seconds. Timer is an object that will emit the timeout() signal in a given interval. We need to stop and start the alternate timers in button pressed / released signal. This application created using the QT Creator "QT Widgets Application" wizard. Hope this help.

//Header File

    class MainWindow : public QMainWindow{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
private slots:
    //Button slots
    void on_pushButton_pressed(); //Continuous press 
    void on_pushButton_released(); //Continuous release
    void on_pushButton_2_clicked(); //stop both the timer
    //QTimer timeout actions
    void timer1_action(); 
    void timer2_action();

private:
    Ui::MainWindow *ui;
    //Timer object
    QTimer *t1, *t2;
    //Date time object for testing
    QDateTime dt1,dt2;
};

//CPP file

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow){
    ui->setupUi(this);
    //Parent object will take care of the deallocation of the 2 timer objects
    t1 = new QTimer(this);
    t2 = new QTimer(this);
    //Interval to the timer object
    t1->setInterval(10);
    t2->setInterval(10);
    //Signal slot for the timer
    this->connect(t1,SIGNAL(timeout()),this,SLOT(timer1_action()));
    this->connect(t2,SIGNAL(timeout()),this,SLOT(timer2_action()));
}
MainWindow::~MainWindow(){
    delete ui;
}
void MainWindow::on_pushButton_pressed(){
    //starting and stoping the timer
    t2->stop();
    t1->start();
    //date time when pressed
    dt1 = QDateTime::currentDateTime();
}
void MainWindow::on_pushButton_released(){
    //starting and stoping the timer
    t1->stop();
    t2->start();
    //date time when pressed
    dt2 = QDateTime::currentDateTime();
}
void MainWindow::timer1_action(){
    ui->txtTimer1->setPlainText("Button Pressed for " + QString::number(dt1.msecsTo(QDateTime::currentDateTime())) + " Milli Seconds");
}
void MainWindow::timer2_action(){
    ui->txtTimer2->setPlainText("Button Released for " + QString::number(dt2.msecsTo(QDateTime::currentDateTime())) + " Milli Seconds");
}
void MainWindow::on_pushButton_2_clicked(){
    //stoping both the timer
    t1->stop();
    t2->stop();
}

Qt handling QPushButton Autorepeat() behavior with isAutoRepeat()

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