Qt Labs Forum » ModelTest

1. 
   Ralf
   Member

   I have a model that does not collect all its data at one time but rather lazily, i.e. when the data is actually needed.
   Therefore my hasChildren() method looks like that:

   
   bool MyTreeModel::hasChildren(const QModelIndex &parent) const
   {
       if (!parent.isValid())
   	{
   		return true;
   	}
   	else
   	{
   			MyTreeElement *parentItem = static_cast<MyTreeElement *>(parent.internalPointer());
   			if (parentItem->populated())
   			    return (parentItem->childCount() > 0);
   			else
   				return true;
   	}
   }
   

   This to my mind causes incorrect ASSERTs in ModelTest.cpp:310:

   
     // rowCount() and columnCount() said that it existed...
      Q_ASSERT(index.isValid() == true);
   

   Is it really a bug in the model or does ModelTest not work perfectly with a lazily popuplated model?

   Ralf

   Posted: 1 year #

2. 
   Benjamin Meyer
   Administrator

   That looks like a bug in your model. Line 310 simply tries to get every index that rowCount() and columnCount() said should exists. I would check the values of r and c to see if the test hit an edge case in the model.

   If a model says it has 10 rows and 8 columns then model->index(5,5).isValid() should be true.

   Posted: 1 year #

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