Time for action – adding properties to the board class

In this exercise, we will be adding a useful property to the board class. The property is going to hold information about the player who should make the next move. The type of the property is going to be the TicTacToeWidget::Player enumeration that we created earlier. For the getter and the setter methods, we are going to use the two functions that we created earlier: currentPlayer() and setCurrentPlayer().

Open the header file for our class and modify the class definition as shown in the following code:

class TicTacToeWidget : public QWidget {
  Q_OBJECT
  Q_ENUMS(Player)
  Q_PROPERTY(Player currentPlayer READ currentPlayer
  WRITE setCurrentPlayer
  NOTIFY currentPlayerChanged)
public:
  enum Player { Invalid, Player1, Player2, Draw };

What just happened?

Since we want to use an enumeration as a type of a property, we have to inform Qt's meta-object system about the enum. This is done with the Q_ENUMS macro. Then, we declare...