#pragma once #include #include #include #include class ApplicationWindow : public QWidget { public: ApplicationWindow() { resize(600, 400); setWindowTitle("Hello World"); auto textEdit = new QTextEdit; textEdit->setText("Hallo"); auto pushButton = new QPushButton("Quit"); auto l = new QVBoxLayout(this); l->addWidget(textEdit); l->addWidget(pushButton); connect(pushButton, &QPushButton::clicked, qApp, &QApplication::quit); } };