mdi.pro Example File

mainwindows/mdi/mdi.pro 
 QT += widgets
 requires(qtConfig(filedialog))

 HEADERS       = mainwindow.h \
                 mdichild.h
 SOURCES       = main.cpp \
                 mainwindow.cpp \
                 mdichild.cpp
 RESOURCES     = mdi.qrc

 # install
 target.path = $$[QT_INSTALL_EXAMPLES]/widgets/mainwindows/mdi
 INSTALLS += target

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