GUI becomes unresponsive when adding more items to TreeModel

[chithara]

Hi, a correction on the understanding. Its not 100 rows insertion at a time to the model.
A single pair of beginInsertRows() and endInsertRows() with 1 row at a time. The entire insertion is happening in a loop of count 100.
Is that the problem ?

[Lesiok]

Of course.

beginInsertRows();
Loop....
endInsertRows();

beginInsertRows();
Loop....
endInsertRows();

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[d_stranz]

Is that the problem ?

As Lesiok said, yes, of course. What you are doing is forcing the UI to update with -every- new row. Do as he suggests - call beginInsertRows() with a row count of 100, add the rows to your internal model, then call endInsertRows() to update the UI.

[chithara]

What will be the first and last index do I need to give in beginInsertRows() ,If I am trying to append 100 nodes to parent.

Currently my code is

beginInsertRows(parent, 0, 0);
for ()
{
parentNode->AppendChild(child));
}

endInsertRows();

[d_stranz]

If I am trying to append 100 nodes to parent.

Your code is incorrect. Read the documentation. QAbstractItemModel::beginInsertRows() explains it.