How to change the color of a row in a QComboBox?

Qt Code: 
  1. #include "modifcons.h"
  2.  
  3. ModifCons::ModifCons()
  4. {
  5.     qDebug() << "modifcons";
  6.  
  7.     m_modifConsignes = new Consignes(QString("settings/consignes.ini"), QSettings::IniFormat);
  8.  
  9.     m_window2 = new QWidget;
  10.     m_window2 ->setFixedSize(1000,600);
  11.     m_window2 ->setWindowTitle("Modification Consignes Gainable");
  12.     adjustSize();
  13.  
  14.     m_label2 = new QLabel(m_window2);
  15.     m_label2 ->setPixmap(QPixmap("/home/ludo/Qt/test2/build/images/modifCons.jpg"));
  16.     m_label2 ->showMaximized();
  17.  
  18.     select = new QComboBox(m_window2);
  19.     select ->setGeometry(50,50,900,120);
  20.     for (int i(0); i < 16; ++i)
  21.     {
  22.         select ->addItem(QString::number(i));
  23.     }
  24.     select ->setStyleSheet("font-size: 30px;");
  25.     select ->setItemText(0,"Consigne Ete/Hiver :");
  26.     select ->setItemText(1,"Consigne Canicule :");
  27.     select ->setItemText(2,"Consigne Bloquage Chauffage :");
  28.     select ->setItemText(3,"Consigne Mode Degivrage (Naturel ou Electrique) Chauffage :");
  29.     select ->setItemText(4,"Consigne Grande Vitesse Ventilation Exterieur Chauffage :");
  30.     select ->setItemText(5,"Consigne Grande Vitesse Ventilation Exterieur Froid :");
  31.     select ->setItemText(6,"Consigne Fin Degivrage Chauffage :");
  32.     select ->setItemText(7,"Consigne Depart Chauffage en Mode Chauffage :");
  33.     select ->setItemText(8,"Consigne Depart Froid en Mode Chauffage :");
  34.     select ->setItemText(9,"Consigne Petite Vitesse Ventilation Interieur Chauffage :");
  35.     select ->setItemText(10,"Consigne Depart Froid en Mode Froid :");
  36.     select ->setItemText(11,"Consigne Depart Chauffage en Mode Froid :");
  37.     select ->setItemText(12,"Consigne Petite Vitesse Ventilation Interieur Froid :"); 
  38.     select ->setItemText(13,"Consigne Depart Ventilation Interieur Chauffage :");
  39.     select ->setItemText(14,"Consigne Lancement Degivrage Froid :");
  40.     select ->setItemText(15,"Consigne Fin Degivrage Froid :");
  41.  
  42.     m_valid1 = new QPushButton("valid",m_window2);
  43.     m_valid1 ->setGeometry(50,180,240,120);
  44.     m_valid1 ->setStyleSheet("font-size: 30px;");
  45.  
  46.     m_quit1 = new QPushButton("quitter",m_window2);
  47.     m_quit1 ->setGeometry(710,440,240,120);
  48.     m_quit1 ->setStyleSheet("font-size: 30px;background-color: red");
  49.  
  50.     connect(m_valid1, &QPushButton::clicked, this, &ModifCons::selectCons);
  51.     connect(m_quit1,&QPushButton::clicked,m_quit1,[this](){m_window2 ->close(); delete m_window2;});
  52.  
  53.     m_window2 ->show();
  54. }
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