i have uses another way because really i don't know, how i can catch "the opening and closing of editor in Qstyleditemdelegate, like what you said

her is my code
Qt Code: 
  1. #include "dialog.h"
  2.  
  3. Dialog::Dialog(QWidget *parent)
  4.     : QWidget(parent)
  5. {
  6.     layoutPrincipale = new QVBoxLayout(this);
  7.     QPushButton *button = new QPushButton("Clear",this);
  8.     tableau = new MonTableauWidget(this);
  9.     tableau->setRowCount(1);
  10.     tableau->setColumnCount(4)  ;
  11.     tableau->setCurrentIndex(tableau->model()->index(0,0,QModelIndex()));
  12.  
  13.     //tableau->setCurrentIndex();
  14.    // QKeyEvent event(QEvent::KeyPress, Qt::Key_Down, Qt::NoModifier);
  15.  
  16.  
  17.     QStringList list ;
  18.     list << "Désignation" << "Qte" << "Prix/U" << "Total";
  19.     tableau->setHorizontalHeaderLabels(list);
  20.     tableau->setCurrentCell(0,0);
  21.     layoutPrincipale->addWidget(tableau);
  22.     layoutPrincipale->addWidget(button);
  23.     setLayout(layoutPrincipale);
  24.     //connect(tableau,SIGNAL(cellChanged(int,int)),this,SLOT(addrow(int,int))) ;
  25.      connect(button,SIGNAL(clicked()),tableau,SLOT(clear()));
  26.      connect(tableau,SIGNAL(itemSelectionChanged()),this,SLOT(newfunction()));
  27.  
  28. }
  29.  
  30. Dialog::~Dialog()
  31. {
  32.  
  33. }
  34.  
  35. void Dialog::addrow(int row, int col)
  36. {
  37.     if(col == 0)
  38.         tableau->insertRow(tableau->rowCount());
  39. }
  40.  
  41. void Dialog::newRecod(QKeyEvent *record)
  42. {
  43.  
  44. }
  45.  
  46. void Dialog::newfunction()
  47. {
  49.     item->setIcon( *(new QIcon("imgs/editIcon.png")));
  50.     tableau->setVerticalHeaderItem(0,item);
  51.     for (int rowToDelete=0; rowToDelete < tableau->rowCount(); ++rowToDelete)
  52.     {
  53.         if(rowToDelete != 0)
  54.             tableau->takeVerticalHeaderItem(rowToDelete);
  55.     }
  56.  
  57. }
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