#include <QApplication>
#include <QtWidgets/QPlainTextEdit>
#include <QtWidgets/QDockWidget>
#include <QtOpenGL/QtOpenGL>

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

  QMainWindow w;
  QPlainTextEdit widget1(&w);
  widget1.setStyleSheet("background-color: #272822");
  widget1.setPlainText("Hello world\nHello world\nHello world\n");
  QDockWidget dock1("dock1", &w);
  dock1.setWidget(&widget1);
  w.addDockWidget(Qt::BottomDockWidgetArea, &dock1);

  QOpenGLWidget widget2(&w);
  QDockWidget dock2("dock2", &w);
  dock2.setWidget(&widget2);
  w.addDockWidget(Qt::BottomDockWidgetArea, &dock2);
  w.show();

  return a.exec();
}