Multi-event handlers : Signal « Qt « C++

1. C++
2. Qt
3. Signal

Multi-event handlers

  

#include <QApplication>
#include <QVBoxLayout>
#include <QLabel>
#include <QSpinBox>
#include <QSlider>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QWidgetwindow;

    QVBoxLayout* mainLayout = new QVBoxLayout(&window);
    QLabel* label = new QLabel("0");
    QSpinBox* spinBox =new QSpinBox;
    QSlider* slider = new QSlider(Qt::Horizontal);

    mainLayout->addWidget(label);
    mainLayout->addWidget(spinBox);
    mainLayout->addWidget(slider);

    QObject::connect(spinBox, SIGNAL(valueChanged(int)),label, SLOT(setNum(int)));
    QObject::connect(spinBox, SIGNAL(valueChanged(int)),slider, SLOT(setValue(int)));
    QObject::connect(slider, SIGNAL(valueChanged(int)),label, SLOT(setNum(int)));
    QObject::connect(slider, SIGNAL(valueChanged(int)),spinBox, SLOT(setValue(int)));

    window.show();

    return a.exec();
}

   
    
  

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