How to set data for the new row when override QAbstractItemModel::insertRows

jronald

override virtual QAbstractItemModel::insertRows(int row, int count, const QModelIndex &parent = QModelIndex()), no data in parameters, how to set data for the new row?

raven-worx

@jronald
call setData() after the row(s) have been successfully inserted

jronald

@raven-worx said in How to set data for the new row when override QAbstractItemModel::insertRows:

@jronald
call setData() after the row(s) have been successfully inserted

Is this the formal way?
Thanks

deleted372

@jronald
It depends what you have as model. For example, if you store your data in QList<myType>myList you can do like this:

bool myModel::insertRows(int position, int rows, const QModelIndex &parentIndex)
{
Q_ASSERT(checkIndex(parentIndex));
if(position<0 || position>rowCount(parentIndex) || rows<=0)
return false;
   beginInsertRows(parentIndex, position, position+rows-1);
   while (rows--) 
      myList.insert(position, new myType("arg1", "arg2", "arg3"));
  endInsertRows();
  return true;
}

[VRonin] edited indexes in beginInsertRows to be correct and added input checks

raven-worx

@JoZCaVaLLo
this wont work.
without the necessary beginInsertRows()/endInsertRows() calls the view wont update.
Also in your code where are the arg variables coming from?

jronald

@JoZCaVaLLo said in How to set data for the new row when override QAbstractItemModel::insertRows:

@jronald
It depends what you have as model. For example, if you store your data in QList<myType>myList you can do like this:
      myList.insert(position, new myType(arg1, arg2, arg3));

Where do arg1 arg2 arg3 come from?

deleted372

@raven-worx
You are right... I edited the code!

deleted372

@jronald
it's an example... the model depends up to you... arg1 arg2 arg3 can be anything...

jronald

@JoZCaVaLLo said in How to set data for the new row when override QAbstractItemModel::insertRows:

@jronald
it's an example... the model depends up to you... arg1 arg2 arg3 can be anything...

so arg1 arg2 arg3 are member variables?

VRonin

To clarify:
@raven-worx's answer is the only way sticking only to the QAbtsractItemModel interface.

call setData() after the row(s) have been successfully inserted

You are free, of course, to implement your own custom interface that allows for insertion with data either by creating something like bool insertRowData(int row, const QVector<QVariant>& dataColumns); or by having a constant or a member variable define what the default data should be