Is it permitted to recursively call QAbstractItemModel::beginInsertRows() ?
That is: call beginInsertRows() and then, before calling endInsertRows(), call beginInsertRows() again?

Eventually, there will be a call to endInsertRows() for every call to beginInsertRows().

The application is to pre-populate a tree with a view of a file system, including all of its sub-directories. There is also other special, proprietary information that is merged with the directory/file names.

I am attempting to do something like this:

Qt Code: 
  1. void  vInsertChildren( const QModelIndex &         a_rtItemIndex,
  2.                        const QList< QFileInfo > &  a_ratChildEntries )
  3. {
  4.    if ( ! a_ratChildEntries.isEmpty() ) {
  5.       // begin inserting children
  6.       beginInsertRows( a_rtItemIndex, 0, 0 + a_ratChildEntries.count() - 1 );
  7.  
  8.       // for each child ...
  9.       for ( int  i = 0;  i <= a_ratChildEntries.count() - 1;  ++ i ) {
  10.          // insert child
  11.          [insert row]
  12.  
  13.          // check for grandchildren
  14.  
  15.          QDir  tGrandchildDir  ( a_ratChildEntries[ i ].filePath() );
  16.          QList< QFileInfo >  atGrandchildEntries;
  17.  
  18.          atGrandchildEntries = tGrandchildDir.entryInfoList(
  19.                                      QDir::AllDirs | QDir::NoDotAndDotDot | QDir::Files,
  20.                                      QDir::Name | QDir::DirsFirst | QDir::IgnoreCase
  21.                                   );
  22.  
  23.          if ( ! atGrandchildEntries.isEmpty() ) {
  24.             // insert grandchildren
  25.             vInsertChildren(
  26.                   index( 0, 0, a_rtItemIndex ),
  27.                   atGrandchildEntries
  28.                );
  29.          }
  30.  
  31.  
  32.       }
  33.  
  34.       // end inserting children
  35.       endInsertRows();
  36.    }
  37. }
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The same question applies to beginRemoveRows() / endRemoveRows().