CODEWITHSUNDEEP
c++qtsignals-slots
Engine
Engine

Reputation: 5420

Using QSlider to change the value of a variable

I'm trying to use QSlider to change the value of a variable, 

 #include <QSlider>

class MainThread : public QWidget{
Q_OBJECT
public:
MainThread(QWidget *parent=0);
private slots:
    void setValue(double);
private:
QSlider *slider; 
};

MainThread::MainThread(QWidget *parent):QWidget(parent){
    slider = new QSlider(Qt::Horizontal,0);
    connect(&slider, SIGNAL((slider->valueChanged())),
             this, SLOT(setValue(double))); // here's my  problem 
    ...
}

My question is how can I connect the SIGNAL of the slider to the setValue(double) SLOT.

Thanks in advance.

Upvotes: 0

Views: 7010

Answers (1)

elsamuko
elsamuko

Reputation: 608

slider is already a pointer, e.g. remove the '&'

connect( slider, SIGNAL((slider->valueChanged())), this, SLOT(setValue(double)) );

Edit: This won't work, since the signal has no argument. Rename the setValue(double) to setValue() and get the value from the slider with slider->value().

Upvotes: 2

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