title: Search/Find functionality in QTableView
body: <p>I have a QWidget and inside that, there is a QTableView. I need to have a find functionality on the first column of the table, so when I click on Ctrl+F, a find dialog will pop-up.</p>
  
  <pre><code>class Widget(QWidget):
      def __init__(self,md,parent=None):
          QWidget.__init__(self,parent)
          layout=QVBoxLayout(self)
  
          # initially construct the visible table
          tv = QTableView()
          # uncomment this if the last column shall cover the rest
          tv.horizontalHeader().setStretchLastSection(True)
          tv.show()
  
          # set black grid lines
          self.setStyleSheet("gridline-color: rgb(39, 42, 49)")
  
          # construct the Qt model belonging to the visible table
          model = NvmQtModel(md)
          tv.setModel(model)
          tv.resizeRowsToContents()
          tv.resizeColumnsToContents()
  
          # set the shortcut ctrl+F for find in menu
          shortcut = QShortcut(QKeySequence('Ctrl+f'), self)
          shortcut.activated.connect(self.handleFind)
  
          # delegate for decimal
          delegate = NvmDelegate()
          tv.setItemDelegate(delegate)
          self.setGeometry(200,200,600,600) # adjust this later
          layout.addWidget(tv)
  
          # set window title
          self.setWindowTitle("TITLE")
  
      # shows and handles the find dialog
      def handleFind(self):
          findDialog = QDialog()
          grid = QGridLayout()
          findDialog.setLayout(grid)
  
          findLabel = QLabel("Find what", findDialog)
          grid.addWidget(findLabel,1,0)
          findField = QLineEdit(findDialog)
          grid.addWidget(findField,1,1)
          findButton = QPushButton("Find", findDialog)
          findButton.clicked.connect(self.find)
          grid.addWidget(findButton,2,1)
  
          findDialog.exec_()
  
      # find function: search in the first column of the table   
      def find(self):
          #to do
  
      # prevent closing the window  without confirmation
      def closeEvent(self, event):
          reply=QMessageBox.question(self,'Message',"Are you sure to quit?",QMessageBox.Yes|QMessageBox.No,QMessageBox.No)
          if reply==QMessageBox.Yes:
              event.accept()
          else:
              event.ignore()
  
  # create the application and the new tree view container
  app=QApplication(sys.argv)
  wid=Widget(md)
  wid.show()
  wid.raise_()
  </code></pre>
  
  <p>I have problem in the findButton action where it should search in the first column of the table. I would appreciate if you guide me in this issue.</p>