an example that has edited "scribble"。 a small function added.

finaltest
.........\.cproject
.........\.project
.........\debug
.........\.....\main.o
.........\.....\mainwindow.o
.........\.....\moc_mainwindow.cpp
.........\.....\moc_mainwindow.o
.........\.....\moc_scribblearea.cpp
.........\.....\moc_scribblearea.o
.........\.....\moc_test1.cpp
.........\.....\moc_test1.o
.........\.....\scribblearea.o
.........\.....\test1.exe
.........\.....\test1.o
.........\main.cpp
.........\mainwindow.cpp
.........\mainwindow.h
.........\Makefile
.........\Makefile.Debug
.........\Makefile.Release
.........\release
.........\.......\main.o
.........\.......\mainwindow.o
.........\.......\moc_mainwindow.cpp
.........\.......\moc_mainwindow.o
.........\.......\moc_scribblearea.cpp
.........\.......\moc_scribblearea.o
.........\.......\moc_test1.cpp
.........\.......\moc_test1.o
.........\.......\scribblearea.o
.........\.......\test1.exe
.........\.......\test1.o
.........\scribblearea.cpp
.........\scribblearea.h
.........\test1.cpp
.........\test1.h
.........\test1.pro
.........\test1.ui
.........\ui_mainwindow.h
.........\ui_scribblearea.h
.........\ui_test1.h

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