I want to have text editor widget that resize text on mouse wheel scroll (like in Qt Creator for example). So I made my class:
Qt Code: 
  1. class MyTextEdit : public QTextEdit 
  2. {
  3.       Q_OBJECT
  4.  
  5.    public:
  6.       MyTextEdit(QWidget* parent = 0) :
  7.          QTextEdit(parent),
  8.          fontSize(8) 
  9.       {
  10.          connect(this, SIGNAL(fontSizeChanged(qreal)), this, SLOT(setFontPointSize(qreal)));
  11.       }
  12.  
  13.    signals:
  14.       void fontSizeChanged(qreal);
  15.  
  16.    protected:
  17.       void wheelEvent(QWheelEvent* e) 
  18.       {
  19.          if ((e->modifiers() == Qt::ControlModifier) && (e->delta() > 0)) 
  20.          {
  21.             fontSize += 0.5;
  22.             emit fontSizeChanged(fontSize);
  23.             std::cout << fontSize << " " << fontPointSize () << std::endl;
  24.          }
  25.          else if ((e->modifiers() == Qt::ControlModifier) && (e->delta() < 0) && (fontSize > 0.5)) 
  26.          {
  27.             fontSize -= 0.5;
  28.             emit fontSizeChanged(fontSize);
  29.             std::cout << fontSize << " " << fontPointSize () << std::endl;
  30.          }
  31.          else
  32.             QTextEdit::wheelEvent(e);
  33.       }
  34.  
  35.    private:
  36.       qreal fontSize;
  37. };
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But it don't work. Can anyone help? :-)

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Sorry for bad english, hope it is understandable