im trying to create a matrix grid that changes its size when an option in the combobox is selected, i dont know how to call the function that creates the grid everytime i change the value of the combo box...



Qt Code: 
  1. void MatrixOP::createGridMatrixSize()
  2. {
  3.     setMatrixSize=new QGroupBox(tr("Select Size"));
  4.     QGridLayout *layout =new QGridLayout;
  5.     QLabel *sizeLabel = new QLabel(tr("Size"));
  6.     QComboBox *chooseSize = new QComboBox;
  7.     chooseSize->addItems(QStringList()<<"0"<<"1"<<"2"<<"3"<<"4"<<"5"<<"6"<<"7"<<"8"<<"9"<<"10");
  8.     chooseSize->setCurrentIndex(1);
  9.     layout->addWidget(sizeLabel, 0,0);
  10.     layout->addWidget(chooseSize, 0,1);
  11.     setMatrixSize->setLayout(layout);
  12. }
  13.  
  14. void MatrixOP::createGridMatrixValues()
  15. {
  16.     int gridSize=chooseSize->currentIndex();
  17.     setMatrixValues = new QGroupBox (tr("Input Values"));
  18.     QGridLayout *layout = new QGridLayout;
  19.     for(int j=1; j<=gridSize;j++){
  20.         for (int i=1; i<=gridSize;i++){
  21.             matrixValues[i]=new QLineEdit;
  22.             layout->addWidget(matrixValues[i], j, i+1);
  23.         }
  24.     }
  25.     setMatrixValues->setLayout(layout);
  26.  
  27. }
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i believe it can be done with SIGNALS and SLOTS but i cant figure out the way to refresh the mainwindow to "redraw" the grid....any help?thx