Description: Part of the learning path QT source 2, 18-27, not very wide, but can be achieved
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File list (Check if you may need any files):
code13
......\2.png
......\code13.pro
......\code13.pro.user
......\main.cpp
......\mainwindow.cpp
......\mainwindow.h
......\mesgb.cpp
......\picture.qrc
code18
......\code18.pro
......\code18.pro.user
......\main.cpp
......\mainwindow.cpp
......\mainwindow.h
code19
......\code19.pro
......\code19.pro.user
......\custombutton.cpp
......\custombutton.h
......\main.cpp
......\mainwindow.cpp
......\mainwindow.h
code21
......\code21.pro
......\code21.pro.user
......\main.cpp
......\mainwindow.cpp
......\mainwindow.h
code22
......\code22.pro
......\code22.pro.user
......\main.cpp
......\mainwindow.cpp
......\mainwindow.h
code24
......\.gitignore
......\code24.pro
......\code24.pro.user
......\main.cpp
......\paintedwidget.cpp
......\paintedwidget.h
code27
......\.gitignore
......\code27.pro
......\code27.pro.user
......\main.cpp
......\painter.cpp
......\painter.h
code30
......\code30.pro
......\code30.pro.user
......\main.cpp
......\mainwindow.cpp
......\mainwindow.h