How to write graphical programs

Question

I have learned C++ and Qt4. I wrote one graphical program with 3000 rows and I found out that there is really complicated to keep code simple, transparent and well-structured. I like design patterns etc. because they are really effective and helps to keep code simpler and more transparent. Now I am going to write another "bigger" application but I would like to have a clear code which will be easy to edit and won't be big problem to add some enhancement etc.

I am looking for some guide, pattern, manual or experience which says how to structure code in graphical applications to be well-structured due to testing ( unit and integration ) in business logic and future edits.

If this manual will be directed to C++ and Qt it will be better but it is not main requirement.

Thanks for your tips.

Answer 1

I would highly recommend the book, Code Complete; http://www.cc2e.com/

Answer 2

"C++ Coding Standards: 101 Rules, Guidelines, And Best Practices". by Herb Sutter, Andrei Alexandrescu

It is a compilation of coding habits. Really brief, really concise, really precise, and not verbose at all. This book is as much important as GoF "Design Patterns" for me.