Description: Custom ComboBox control, a custom ruler class, according to the need to adjust the start and interval scale
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File list (Check if you may need any files):
ruler\main.cpp
.....\mdichild.cpp
.....\mdichild.h
.....\ruler.cpp
.....\ruler.h
.....\ruler.pro
.....\ruler.pro.user
.....\textedit.cpp
.....\textedit.h
ruler