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#ifndef WIN_H
#define WIN_H
#include <QWidget>
#include <QtWidgets>

class win : public QWidget
{
public:
    win(QString str);

    QProgressBar *pgb1;
    QPushButton *btn_plus;
    QVBoxLayout *lay_main;

    int count;

signals:
    void set_pos(int);
public slots:
    void increase(bool);
};

#endif // WIN_H

#include "win.h"

win::win(QString str)
{
    setWindowTitle(str);

    pgb1 = new QProgressBar;
    pgb1->setOrientation(Qt::Vertical);
    btn_plus = new QPushButton("+");
    lay_main = new QVBoxLayout;

    lay_main->addWidget(pgb1);
    lay_main->addWidget(btn_plus);

    setLayout(lay_main);

    QObject::connect(btn_plus, SIGNAL(clicked()), this, SLOT(increase()));
    QObject::connect(this, SIGNAL(set_pos(int)), pgb1, SLOT(setValue(int)));
}

void win::increase(bool)
{
    count++;
    emit set_pos(count);
}

void win::set_pos(int)
{

}

#include <QApplication>
#include <QtWidgets>
#include "win.h"

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

    win win1("This is a window");
    win1.show();

    return app.exec();
}

class win : public QWidget
{
    Q_OBJECT
public:
    win(QString str);

    QProgressBar *pgb1;
    QPushButton *btn_plus;
    QVBoxLayout *lay_main;

    int count;

public slots:
    void increase();

signals:
    void set_pos(int data);
};