Insert item into model displayed with ListView QML component

[cristeab]

Hi

I have a simple model shown in a ListView The model is actually a vector of messages that should appear in the list. This is how I try currently to insert a new message:

void MessagesModel::insertMessage(Message *newMsg)
{
      QMutexLocker locker(&_messagesMutex);
      int rowPos = _messages.count();
      //emit layoutAboutToBeChanged();
     beginInsertRows(QModelIndex(), rowPos, rowPos);
     _messages.push_back(newMsg);
     locker.unlock();
    //emit layoutChanged();
    endInsertRows();
}

However, when I try to insert a new message the entire application blocks. If I use the commented lines instead (emit layoutAboutToBeChanged(), etc) the message is inserted but the item height in the ListView is not correctly detected and in some cases I get overlapped items (each message contains text, but the number of lines vary). Could someone explain what I am doing wrong and suggest a solution ?

thanks
Bogdan