qt-everywhere-src-5.15.1/qtbase/tests/manual/qlayout/qlayout.pro

QT       += widgets

TEMPLATE = app

SOURCES += main.cpp\
        mainwindow.cpp \
        hbwidget.cpp \
        gridwidget.cpp \
        vbwidget.cpp

HEADERS += mainwindow.h \
        hbwidget.h \
        gridwidget.h \
        vbwidget.h