Hello everyone ,
I would like to create a "FenCC"(QDialog) window after clicking the "Composantes" button but I tried and it does not work .
Here is the Description :
1-I fill the QTableWidget
2-I click on the button "Generer"
3-the array M is filled by the value in the QTableWidget
4-I click on "Dessiner" button
5-Creation of a QDialog whose type is "FenDessin"
6-I click on the "Composantes" button
7-création of a QDialog whose type is "FenCC"

It is the points 6 et 7 that do not work but the points 1, 2 , 3 , 4 , 5 work .

Here is the code:

Qt Code: 
  1. //FenPrincipale.h
  2. //FenPrinicipale.h
  3. #ifndef FENPRINCIPALE_H
  4. #define FENPRINCIPALE_H
  5. #include <QtGui>
  6.  
  7. class FenPrincipale : public QWidget
  8. {
  9.     Q_OBJECT
  10. public:
  11.     FenPrincipale();
  12.     bool  M[10][10];
  13.  
  14. private slots:
  15.     void FillIn();
  16.     void FenetreDessin();
  17. private:
  18.     QTableWidget  *tabM;
  19.     QPushButton * generer;
  20.     QPushButton * dessiner;
  21.     QVBoxLayout * vbox;
  22.  
  23. };
  24. #endif // FENPRINCIPALE_H
  25.  
  26. //FenPrincipale.cpp
  27.  
  28. //FenPrincipale.cpp
  29. #include "qDebug.h"
  30. #include "FenPrincipale.h"
  31. #include "FenDessin.h"
  32. FenPrincipale::FenPrincipale()
  33. {
  34.     tabM =new QTableWidget(this);
  35.     tabM->setRowCount(10);
  36.     tabM->setColumnCount(10);
  37.     generer = new QPushButton("&Générer !",this);
  38.    dessiner = new QPushButton("&Dessiner !",this);
  39.  
  40.     QVBoxLayout* vbox = new QVBoxLayout();
  41.     vbox->addWidget(generer);
  42.     vbox->addWidget(dessiner);
  43.     vbox->addWidget(tabM);
  44.     this->setLayout(vbox);
  45.     for (int r = 0; r < 10; r++) {
  46.         for (int c = 0; c < 10; c++) {
  48.             tabM->setItem(r, c, it);
  49.             it->setData(Qt::EditRole, 0);
  50.  
  51.         }
  52.     }
  53.     connect(generer, SIGNAL(clicked()), this, SLOT(FillIn()));
  54. }
  55. void FenPrincipale::FillIn()
  56. {
  57.     for (int r = 0; r < 10; r++) {
  58.         for (int c = 0; c < 10; c++) {
  59.             QTableWidgetItem *it = tabM->item(r,c);;
  60.             Q_ASSERT(it);
  61.             qDebug() <<it;
  62.             int val = (it->data(Qt::EditRole)).toInt();
  63.             M[r][c] = (val == 1)? true: false;
  64.           //  qDebug() <<M[r][c];
  65.         }
  66.     }
  67.     connect(dessiner, SIGNAL(clicked()), this, SLOT(FenetreDessin()));
  68. }
  69. void FenPrincipale::FenetreDessin()
  70. {
  71.     FenDessin *fenetreC = new FenDessin(this);
  72.     fenetreC->setFixedSize(950,900);
  73.     fenetreC->show();
  74. }
  75.  
  76.  
  77. //FenDessin.h
  78. //FenDessin.h
  79. #ifndef FENDESSIN_H
  80. #define FENDESSIN_H
  81. #include <QtGui>
  82. #include"FenPrincipale.h"
  83. class FenDessin : public QWidget
  84. {
  85. public:
  86.     FenDessin ( FenPrincipale* parent);
  87. private:
  88.     QPushButton *Composante;
  89.     QPainter *painter;
  90.     FenPrincipale * ref;
  91. private slots:
  92.     void paintEvent (QPaintEvent *);
  93.     void CC ();
  94. };
  95. #endif // FENDESSIN_H
  96.  
  97. //FenDessin.cpp
  98. #include "FenDessin.h"
  99. #include "FenPrincipale.h"
  100. #include "FenCC.h"
  101. FenDessin::FenDessin( FenPrincipale *parent) :QDialog(parent),ref(parent)
  102. {
  103.     Composante = new QPushButton("Composante",this);
  104.     QPaintEvent *c=NULL;
  105.     paintEvent(c);
  106.  
  107.     connect(Composante, SIGNAL(clicked()), this, SLOT(CC()));
  108.  
  109. }
  110.  
  111. void FenDessin::paintEvent(QPaintEvent *c)
  112. {
  113.     QPainter painter(this);
  114.  
  115.  
  116.     int  tour=0;
  117.     int x=10;
  118.     int y=10;
  119.     int Num_Sommet=0;
  120.     int T_Coordonnees [10][3];
  121.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
  122.     {
  123.         (T_Coordonnees[Num_Sommet][0])=x;
  124.         (T_Coordonnees[Num_Sommet][1])=y;
  125.         (T_Coordonnees[Num_Sommet][2])=tour;
  126.  
  127.         if (tour==0)
  128.         {
  129.             x+=35;
  130.             tour=1;
  131.         }
  132.         else
  133.         {
  134.             y+=55;
  135.             tour=0;
  136.         }
  137.  
  138.     }
  139.  
  140.     int w1=0;
  141.     int w2=0;
  142.     int cpt=10;
  143.     Num_Sommet=0;
  144.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
  145.     {
  146.         if ( (T_Coordonnees[Num_Sommet][2])==1)
  147.         {   if(w1==0)
  148.             {
  149.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+500) ;
  150.                 w1=1;
  151.             }
  152.             else
  153.             {
  154.                 if(w1==1)
  155.                 {
  156.                     (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+250+cpt) ;
  157.                     w1=0;
  158.                     cpt=cpt+15;
  159.                 }
  160.             }
  161.             if (Num_Sommet==9)
  162.             {
  163.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+45) ;
  164.             }
  165.  
  166.         }
  167.         else
  168.         {
  169.             if(w2==0)
  170.             {
  171.                 (T_Coordonnees[Num_Sommet][0])=(T_Coordonnees[Num_Sommet][0])+200;
  172.                 w2=1;
  173.             }
  174.             else
  175.             {
  176.                 (T_Coordonnees[Num_Sommet][0])=(T_Coordonnees[Num_Sommet][0])+100+cpt;
  177.                 w2=0;
  178.                 cpt=cpt+15;
  179.             }
  180.  
  181.             if (Num_Sommet==4)
  182.             {
  183.                 (T_Coordonnees[Num_Sommet][0])=((T_Coordonnees[Num_Sommet][0])+45) ;
  184.             }
  185.         }
  186.         painter.drawEllipse((T_Coordonnees[Num_Sommet][0]), (T_Coordonnees[Num_Sommet][1]), 30.0, 30.0);
  187.     }
  188.  
  189.     int i,j;
  190.     for (i=0; i<10; i++)
  191.     {
  192.         for (j=0; j<10; j++)
  193.         {
  194.             if ((ref->M[i][j])==1)
  195.             {
  196.                 painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]));
  197.             }
  198.         }
  199.     }
  200.  
  201.  
  202.  
  203.     for (i=0; i<10; i++)
  204.     {
  205.         for (j=0; j<10; j++)
  206.         {
  207.             if ((ref->M[i][j]==1) &&  (ref->M[j][i]==1))
  208.             {
  209.                 painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]));
  210.                 if(  (T_Coordonnees[i][1]>45)||(T_Coordonnees[j][1]>45)  )
  211.                 {
  212.                     painter.drawLine(((T_Coordonnees[i][0]+20)-10),(T_Coordonnees[i][1]),((T_Coordonnees[j][0]+20)-10),(T_Coordonnees[j][1]));
  213.                 }
  214.                 else
  215.                 {
  216.                     painter.drawLine((T_Coordonnees[i][0]+20),(T_Coordonnees[i][1]+30),(T_Coordonnees[j][0]+20),(T_Coordonnees[j][1]+30));
  217.                 }
  218.             }
  219.         }
  220.     }
  221.     ////////////////////////////////////////////////
  222.     Num_Sommet=0;
  223.     for (Num_Sommet=0; Num_Sommet<10; Num_Sommet++)
  224.     {
  225.         QPoint point = QPoint( (((T_Coordonnees[Num_Sommet][0])+15)), ((T_Coordonnees[Num_Sommet][1])+15) );
  226.         QString str;
  227.         str.setNum(Num_Sommet);
  228.         painter.drawText( point,str);
  229.  
  230.     }
  231. }
  232. void FenDessin::CC()
  233. {
  234.  
  235.     FenCC *fenetreCC = new FenCC(this);
  236.     fenetreCC->setFixedSize(900,900);
  237.     fenetreCC->show();
  238. }
  239. //FenCC.h
  240. #ifndef FENCC_H
  241. #define FENCC_H
  242. #include <QtGui>
  243. class FenCC : public QDialog
  244. {
  245. public:
  246. FenCC ( QDialog *parent);
  247. private:
  248. QPushButton *fermer;
  249. private slots:
  250. };
  251. #endif
  252.  
  253. //FenCC.cpp
  254.  
  255. #include "FenCC.h"
  256. FenCC::FenCC( QDialog *parent = 0) :QDialog(parent)
  257. {
  258.     fermer = new QPushButton("Fermer",this);
  259.  
  260.     connect(fermer, SIGNAL(clicked()), this, SLOT(accept()));
  261.  
  262. }
  263.  
  264.  
  265. //main.cpp
  266.  
  267. #include <QApplication>
  268. #include "FenPrincipale.h"
  269. int main(int argc, char* argv[])
  270. {
  271.     QApplication app(argc, argv);
  272.     FenPrincipale fenetre;
  273.     fenetre.show();
  274.     return app.exec();
  275. }
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Thank you in advance for your attention and help.