Hi and thank you for your answer,

In fact reset is called only 3 times for this table:
1-when the table is initialized and empty
2-when the table is refreshed to display only 20 lines
3-when the table is refreshed to display all lines (this is the case with bad performances.

All other calls are for other tables containing around 10 lines.

So, I can't reduce the number of call to reset.

Here is the code:
Qt Code: 
  1. QVariant SKGObjectModelBase::data(const QModelIndex &index, int role) const
  2. {
  3.         if (!index.isValid()) return QVariant();
  4.         _SKGTRACEIN(10, "SKGObjectModelBase::data");
  5.  
  6.         SKGObjectBase* obj = (SKGObjectBase*) index.internalPointer();
  7.  
  8.         switch ( role ) {
  9.         case Qt::DisplayRole:
  10.         case Qt::EditRole:
  11.         case Qt::UserRole: {
  12.                 QString att=listAttibutes[index.column()];
  13.                 QString val=obj->getAttribute(att);
  14.  
  15.                 if (att.startsWith("f_")) {
  16.                         double dval=SKGServices::stringToDouble(val);
  17.                         return dval;
  18.                 } else if (att.startsWith("i_")) {
  19.                         return SKGServices::stringToInt(val);
  20.                 } else if (att.startsWith("d_")) {
  21.                         QDate dval=SKGServices::stringToTime(val).date();
  22.                         if (role == Qt::DisplayRole) {
  23.                                 return KGlobal::locale()->formatDate (dval, KLocale::FancyShortDate);
  24.                         } else {
  25.                                 return dval;
  26.                         }
  27.                 } else if (getRealTable()=="doctransaction" && att=="t_savestep") return "";
  28.                 return val;
  29.         }
  30.  
  31.         case Qt::TextColorRole: {
  32.                 //Text color
  33.                 QString att=listAttibutes[index.column()];
  34.                 if (att.startsWith("f_")) {
  35.                         QVariant value_displayed = SKGObjectModelBase::data(index, Qt::UserRole);
  36.                         bool ok=false;
  37.                         double value_double=value_displayed.toDouble(&ok);
  38.                         if (ok && value_double<0) return qVariantFromValue(QColor(Qt::red));
  39.                 }
  40.                 break;
  41.         }
  42.         case Qt::TextAlignmentRole: {
  43.                 //Text alignment
  44.                 QString att=listAttibutes[index.column()];
  45.                 return (int)(Qt::AlignVCenter|(att.startsWith("f_") || att.startsWith("i_") ? Qt::AlignRight : Qt::AlignLeft));
  46.         }
  47.         case Qt::DecorationRole: {
  48.                 //Decoration
  49.                 if (index.column() == 0 && getRealTable()=="node") {
  50.                         SKGNodeObject node =*obj;
  51.                         QStringList data=SKGServices::splitCSVLine(node.getData());
  52.                         if (data.count()>2) return qVariantFromValue((QIcon) KIcon(data.at(2)));
  53.                         else {
  54.                                 return qVariantFromValue((QIcon) KIcon(node.getName()==i18n("autostart") ? "folder-bookmarks" : "folder"));
  55.                         }
  56.                 } else if (index.column() == 0 && getRealTable()=="doctransaction") {
  57.                         return qVariantFromValue((QIcon) KIcon(obj->getAttribute("t_mode")=="U" ? "edit-undo" :"edit-redo"));
  58.                 } else if (getRealTable()=="doctransaction" && listAttibutes[index.column()]=="t_savestep") {
  59.                         if (obj->getAttribute("t_savestep")=="Y") return qVariantFromValue((QIcon) KIcon("document-save"));
  60.                 }
  61.                 break;
  62.         }
  63.         case Qt::ToolTipRole: {
  64.                 //Tooltip
  65.                 if (getRealTable()=="doctransaction") {
  67.                         document->getMessages(obj->getID(), msg);
  68.                         int nbMessages=msg.count();
  69.                         if (nbMessages) {
  70.                                 QString message;
  71.                                 for (int i=0; i<nbMessages; ++i) {
  72.                                         if (i!=0) message+='\n';
  73.                                         message+=msg.at(i);
  74.                                 }
  75.  
  76.                                 return message;
  77.                         }
  78.                 }
  79.                 break;
  80.         }
  81.         default : {
  82.         }
  83.         }
  84.  
  85.         return QVariant();
  86. }
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