Here is an example code where all three signals are emitted.

Make a note of this

1. When mouse left cliecked -> cellClicked() is emitted.
2. When mouse left double clicked -> cellClicked() and cellDoubleClicked() is emitted.
3. When mouse right clicked -> cellClicked() and customContextMenuRequested() is emitted.

QTableWidget.jpg
Qt Code: 
  1. #include <QtGui>
  2. #include <QApplication>
  3.  
  4. class Widget : public QTextBrowser
  5. {
  6.     Q_OBJECT
  7.  
  8. public:
  9.     explicit Widget(QTableWidget * table)
  11.     {
  12.         connect(table, SIGNAL(cellDoubleClicked(int, int)), this, SLOT(tableChangeDbl(int, int)));
  13.         connect(table, SIGNAL(cellClicked(int, int)), this, SLOT(tableChange(int, int)));
  14.  
  15.         table->setContextMenuPolicy(Qt::CustomContextMenu);
  16.         connect(table, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(PopupMenuTableShow(const QPoint &)));
  17.         show();
  18.     }
  19.  
  20. public slots:
  21.     void tableChange(int row, int column)
  22.     {
  23.         append(QString("Clicked %1, %2").arg(row).arg(column));
  24.     }
  25.  
  26.     void tableChangeDbl(int row, int column)
  27.     {
  28.         append(QString("Double Clicked %1, %2").arg(row).arg(column));
  29.     }
  30.  
  31.     void PopupMenuTableShow(const QPoint & point)
  32.     {
  33.         append(QString("Menu %1, %2").arg(point.x()).arg(point.y()));
  34.     }
  35. };
  36.  
  37. int main(int argc, char **argv)
  38. {
  39.     QApplication app(argc, argv);
  40.  
  41.     QTableWidget tableWidget;
  42.     Widget widget(&tableWidget);
  43.  
  44.     tableWidget.setRowCount(10);
  45.     tableWidget.setColumnCount(2);
  46.     for(int r = 0 ; r < tableWidget.rowCount(); r++)
  47.         for(int c = 0 ; c < tableWidget.columnCount(); c++)
  48.             tableWidget.setItem(r, c, new QTableWidgetItem(QString("%1:%2").arg(r).arg(c)));
  49.  
  50.     tableWidget.setWindowTitle("QTableWidget");
  51.     widget.setWindowTitle("Widget");
  52.  
  53.     tableWidget.show();
  54.     widget.show();
  55.  
  56.     return app.exec();
  57. }
  58.  
  59. #include "main.moc"
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