Hi all,

I need to populate the standardItemModel for my treeView, with possibly upto 300,000 rows.

My treeView acts like a TableView, I guess I could use TableView if its quicker, as there is a flat hierarchy of items.

At the moment 30,000 rows can take 5-6 seconds, which is unacceptable.
I'm pretty sure I'm doing something sub-optimal.
Thus why the need for a progress bar.

Any suggestions please.

Qt Code: 
  1. treeView = new QTreeView;
  2.   model = new QStandardItemModel(0,13);
  3.   treeView->setModel(model);
  4.  
  5. void GamesTab::showMatches()
  6. {
  7.   treeView->setUpdatesEnabled (false);
  8.  
  9.   modelindex = model->index(0, 0, modelindex);
  10.   model->insertRows(0, mainBoard->filteredResults.size(), modelindex);
  11.   QVariant data;
  12.  
  13.   QString number =   
  14.   for (unsigned int i = 0; i < mainBoard->filteredResults.size(); i++) {
  15. int db = mainBoard->filteredResults[i]->dbIndex;
  16.     int game = mainBoard->filteredResults[i]->gameIndex;
  17.     gamePtr = dbManager_->databases[db]->database->Games[game];
  18.  
  19.     data = (dbManager_->databases[db]->name).c_str();
  20.     model->setData(model->index(i, headerPosDatabase_, modelindex), data);
  21.     data = (gamePtr->getPlayerW()).c_str();
  22.     model->setData(model->index(i, headerPosPlayerWhite_, modelindex), data);
  23.     data = (gamePtr->getPlayerB()).c_str();
  24.     model->setData(model->index(i, headerPosPlayerBlack_, modelindex), data);
  25.     data = (gamePtr->getRankW()).c_str();
  26.     model->setData(model->index(i, headerPosRankWhite_, modelindex), data);
  27.     data = (gamePtr->getRankB()).c_str();
  28.     model->setData(model->index(i, headerPosRankBlack_, modelindex), data);
  29.     data = (gamePtr->getResultStr()).c_str();
  30.     model->setData(model->index(i, headerPosResult_, modelindex), data);
  31.     data = (gamePtr->getKomi()).c_str();
  32.     model->setData(model->index(i, headerPosKomi_, modelindex), data);
  33.     data = (gamePtr->getDate()).c_str();
  34.     model->setData(model->index(i, headerPosDate_, modelindex), data);
  35.     data = gamePtr->getMoveCount();
  36.     model->setData(model->index(i, headerPosMoveCount_, modelindex), data);
  37.     data = (gamePtr->getHandicap()).c_str();
  38.     model->setData(model->index(i, headerPosHandicap_, modelindex), data);
  39.     data = (gamePtr->getPlace()).c_str();
  40.     model->setData(model->index(i, headerPosPlace_, modelindex), data);
  41.     data = (gamePtr->getEvent()).c_str();
  42.     model->setData(model->index(i, headerPosEvent_, modelindex), data);
  43.  
  44.     progressBar_->setValue(i + 1);
  45.   }
  46.  
  47.   treeView->setUpdatesEnabled (true);
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