ProgressBar.h

#pragma once
#include <QFrame>
#include <QMainWindow>
#include <QProgressBar>
#include <QTimer>

namespace Examples {
  class Window1 : public QMainWindow {
    Q_OBJECT
  public:
    Window1() {
      progressBar1.move(50, 50);
      progressBar1.resize(200, 25);
      progressBar1.setTextVisible(false);

      progressBar2.move(50, 80);
      progressBar2.resize(200, 25);
      progressBar2.setValue(50);
      progressBar2.setTextVisible(false);

      progressBar3.move(50, 110);
      progressBar3.resize(200, 25);
      progressBar3.setMaximum(300);
      progressBar3.setValue(300);
      progressBar3.setTextVisible(false);

      progressBar4.move(50, 140);
      progressBar4.resize(200, 25);
      progressBar4.setMaximum(140);
      progressBar4.setTextVisible(false);

      progressBar5.move(50, 170);
      progressBar5.resize(200, 25);
      progressBar5.setMinimum(0);
      progressBar5.setMaximum(0);
      progressBar5.setTextVisible(false);

      timer.setInterval(50);
      connect(&timer, &QTimer::timeout, [&] {
        progressBar4.setValue(progressBar4.value() < progressBar4.maximum() ? progressBar4.value() + 1 : progressBar4.minimum());
      });
      timer.start();

      setCentralWidget(&frame);
      setWindowTitle("Progress bar example");
      resize(300, 300);
    }

  private:
    QFrame frame;
    QProgressBar progressBar1 {&frame};
    QProgressBar progressBar2 {&frame};
    QProgressBar progressBar3 {&frame};
    QProgressBar progressBar4 {&frame};
    QProgressBar progressBar5 {&frame};
    QTimer timer {this};
  };
}