Unable to understand Undo Redo Framework in Qt

Unable to understand Undo Redo Framework in Qt

References

Reference NO 1

http://stackoverflow.com/questions/15186360/unable-to-understand-undo-redo-framework-in-qt

Reference NO 2

http://stackoverflow.com/questions/3553081/understand-design-of-c-framework

Reference NO 3

http://stackoverflow.com/questions/tagged/undo-redo?sort=votes&pagesize=50

Reference NO 4

http://blog.qt.digia.com/blog/2010/01/27/upcoming-qtcreator-support-for-qml-or-what-is-bauhaus/

Reference NO 5

http://www.qtcentre.org/archive/index.php/t-13113.html

Reference NO 6

http://sourceforge.net/apps/mediawiki/free-cad/index.php?title=Manual

Reference NO 7

http://www.scitools.com/support/buildLogs/understand2_build_log.html

Reference NO 8

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