I have a model-view set up and so far, they appear synchronized. Now my problem appears when I am trying to change the text in one of the QTreeView leaves.

Given a QModelIndex, I can change the leaf's color using something like:

Qt Code: 
  1. QAbstractItemModel *Model = const_cast<QAbstractItemModel*>(Current_Model_Index->model());
  2. Model->setData(*Current_Model_Index,Qt::blue,Qt::TextColorRole);
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Similarly, I attempted to change the value of the text using this:
Qt Code: 
  1. Model->setData(*Current_Model_Index,tr("XXXXXXX"),Qt::DisplayRole);
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That did not work. So I checked: Model->data(*Current_Model_Index,Qt::ItemIsEditable).toB ool() and this returned false.

I tried to change this property to true but it would not hold (the values was not retained when checked). How can I achieve my goal of assigning a text value to a tree leaf given its QModelIndex?