A rough solution
Qt Code: 
  1. class TableWidget : public QTableWidget
  2. {
  3. public:
  4.     explicit TableWidget(QWidget * parent = 0)
  5.         : QTableWidget(parent)
  6.     {
  7.         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  8.         horizontalHeader()->setStretchLastSection(true);
  9.     }
  10.  
  11.     TableWidget(int rows, int columns, QWidget *parent = 0)
  12.         : QTableWidget(rows, columns, parent)
  13.     {
  14.         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  15.         horizontalHeader()->setStretchLastSection(true);
  16.     }
  17.  
  18. protected:
  19.     void resizeEvent(QResizeEvent * event)
  20.     {
  21.         if(model() and model()->columnCount())
  22.             for(int column = 0; column < model()->columnCount(); column++)
  23.                 setColumnWidth(column, event->size().width() / model()->columnCount());
  24.     }
  25. };
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