#include <QApplication>
#include <QGraphicsView>
#include <QVBoxLayout>
#include <QPushButton>
#include <QGraphicsScene>
#include <QKeyEvent>

class Window: public QGraphicsView {
    private:
        QPushButton *m_button1, *m_button2;

    protected:
        void keyPressEvent(QKeyEvent *event) {
            if (event->key() == Qt::Key_Return) {
                delete m_button1;
                m_button1 = NULL;
            }
        }

    public:
        Window(QWidget *parent = 0): QGraphicsView(parent) {
            setScene(new QGraphicsScene);

            QWidget* widget = new QWidget;
            widget->setLayout(new QVBoxLayout);
            widget->layout()->addWidget(m_button1 = new QPushButton("yolo"));
            widget->layout()->addWidget(m_button2 = new QPushButton("swag"));
            scene()->addWidget(widget);
        }
};

int main(int argc, char** argv) {
    QApplication app(argc, argv);
    Window widget;
    widget.show();
    
    return app.exec();
}