That's not really an answer to OP's question, is it? Or did OP edit the contents of the post?
Yeah it is.
We can give more help, yes. However, it would be useful for all of us if you could specify what exactly you don't understand.
In general: QStandardItem helps you represent your tree structure in your code and knows how to access one specific piece of data. It will help you keep your actual model implementation simple, because you leave most of the work to the QStandardItem. It has a somewhat similar interface to models.
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