QLineEdit && QLabel

[jacek]

To make it work you have to add Q_OBJECT macro like this:

class mojClass : public QWidget
{
   Q_OBJECT
   public:
      ...

class mojClass : public QWidget
{
   Q_OBJECT
   public:
      ...

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Each class that defines new slots or signals must contain Q_OBJECT macro. Also remember to rerun qmake if you add that macro somewhere.

If you have placed everything in a single file, say somefile.cpp, you have to add #include "somefile.moc" at the end and rerun qmake. This isn't necessary if you have placed class definition in a header file.