Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
https://en.wikipedia.org/wiki/Dependency_inversion_principle
Basically what you are doing is evil.
You should connect m_tree_view->selectionModel()'s currentIndexChanged() signal with a slot that calls setHeaderData in the model. that's all
